{"id":6648,"date":"2025-12-10T09:24:39","date_gmt":"2025-12-10T09:24:39","guid":{"rendered":"https:\/\/welleshaft.com\/?p=6648"},"modified":"2025-12-10T09:24:39","modified_gmt":"2025-12-10T09:24:39","slug":"ss-nut-bolt","status":"publish","type":"post","link":"https:\/\/welleshaft.com\/en_gb\/ss-nut-bolt\/","title":{"rendered":"SS Nuts And Bolts"},"content":{"rendered":"<h2><strong><b>Stainless Steel Nuts and Bolts: Grades, Standards, and Sourcing Guide<\/b><\/strong><\/h2>\n<h2><strong><b>What Are the Main Stainless Steel Material Grades for Nuts and Bolts?<\/b><\/strong><\/h2>\n<p>SS Nuts And Bolts come in various grades, each with unique characteristics, making it essential to choose the right material for durability and performance. The most common ones include 316, 410,<strong> <a href=\"https:\/\/welleshaft.com\/en\/18-8-stainless-steel-vs-304\/\">304 and 18-8 stainless steel.<\/a><\/strong><\/p>\n<ul>\n<li>316 Stainless Steel: 316 stainless steel uses a mix of about 16\u201318% chromium, 10\u201314% nickel, and a touch of molybdenum, which gives it noticeably better corrosion resistance than 304 or standard 18-8 stainless. That extra protection is why 316 is the go-to choice for harsh, wet, or coastal environments\u2014salt in the air alone can ruin regular fasteners over time. If you\u2019re dealing with boats, docks, piers, pools, or even chemical-industry setups, 316 stainless fasteners are usually the safest, most reliable option.<\/li>\n<li>410 Stainless Steel: 410 stainless steel contains roughly 11.5%\u201313.5% chromium with a low carbon limit, and it can be hardened up to around 40 Rockwell C. That gives it noticeably higher hardness and wear resistance than 18-8 stainless, though it sacrifices some corrosion resistance. Because of that balance, 410 is widely used for roofing screws, siding screws, and many self-tapping fasteners. Its martensitic structure also makes it a solid choice for mechanical parts that take a beating, like shafts and gears.<\/li>\n<li>304 Stainless Steel: Excellent corrosion resistance, widely used in general industrial applications, kitchens, and outdoor fixtures.<\/li>\n<li>18-8 Stainless Steel: 18-8 stainless steel simply refers to the classic 300-series blend with around 18% chromium and 8% nickel\u2014basically another way of saying 304 stainless. It\u2019s one of the most common grades you\u2019ll see in stainless steel fasteners because it offers solid corrosion resistance and long service life. In freshwater or general outdoor use, 18-8\/304 performs well, though it\u2019s not as tough as 316 stainless in harsh salt-water conditions. It resists rusting and oxidation, may dull a bit over time, and is roughly equivalent to metric A2 stainless steel.<\/li>\n<\/ul>\n<p>Using the correct grade ensures durability, especially when fasteners are exposed to harsh environments. For instance, ss nuts and bolts\u00a0in coastal regions often require 316 stainless fasteners\u00a0to prevent rusting.<\/p>\n<h2><strong><b>How Are Stainless Steel Fasteners Classified into Austenitic, Martensitic, and Ferritic Types?<\/b><\/strong><\/h2>\n<p>Stainless steel fasteners are divided into three main types, based on their crystal structure:<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong><b>Type<\/b><\/strong><\/td>\n<td><strong><b>Characteristics<\/b><\/strong><\/td>\n<td><strong><b>Common Applications<\/b><\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>Austenitic<\/strong><\/td>\n<td>High corrosion resistance, non-magnetic, excellent ductility<\/td>\n<td>304 &amp; 316 bolts, kitchen equipment, chemical industry<\/td>\n<\/tr>\n<tr>\n<td><strong>Martensitic<\/strong><\/td>\n<td>Magnetic, harder, wear-resistant<\/td>\n<td>410 bolts, shafts, industrial machinery<\/td>\n<\/tr>\n<tr>\n<td><strong>Ferritic<\/strong><\/td>\n<td>Moderate corrosion resistance, magnetic, less ductile<\/td>\n<td>Automotive trim, industrial panels<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><strong><b>Austenitic Stainless Steel<\/b><\/strong><\/h3>\n<p><a href=\"https:\/\/welleshaft.com\/en\/austenitic-stainless-steel-fasteners-industrial-options\/\"><strong>Austenitic stainless steel<\/strong><\/a>\u2014typically holding about 15\u201320% chromium and 5\u201319% nickel\u2014is the group most people rely on for stainless steel nuts and bolts because it balances strength and strong corrosion resistance. Grades like 302, 303, 304, 304L, 316, 321, 347, and 348 all fall into this family. They usually deliver around 80,000 to 150,000 PSI in tensile strength, which is why these alloys are the everyday choice for general hardware, especially when durability and rust resistance both matter.<\/p>\n<h3><strong><b>Martensitic Stainless Steel<\/b><\/strong><\/h3>\n<p><a href=\"https:\/\/welleshaft.com\/en\/define-martensitic-stainless-steel-what-is-martensite-uses\/\"><strong>Martensitic stainless steel<\/strong><\/a>, which typically contains about 12\u201318% chromium, is the go-to option when hardness matters most. It\u2019s magnetic, can be heat-treated for extra strength, and is commonly used for hardened steel bolts or ss nut bolts in demanding mechanical setups. Welding isn\u2019t ideal with this family, but grades like 410, 416, 420, and 431 deliver serious performance, reaching roughly 180,000 to 250,000 PSI in tensile strength.<\/p>\n<h3><strong><b>Ferritic Stainless Steel<\/b><\/strong><\/h3>\n<p>Ferritic stainless steel, usually running about 15\u201318% chromium, is often picked for jobs where appearance matters or where the environment is only mildly corrosive\u2014think stainless steel jack nuts or other metal nuts used in general construction. It\u2019s magnetic, can\u2019t be heat-treated, and isn\u2019t great for welding, but it still offers decent corrosion resistance. With a tensile strength around 65,000\u201387,000 PSI, grades like 430 and 430F work well when you need a clean look without the demands of harsher conditions.<\/p>\n<h2><strong><b>How Do International Stainless Steel Bolt Grades Compare?<\/b><\/strong><\/h2>\n<p>Stainless steel bolt grades vary worldwide, and different regions rely on ASTM, ISO, DIN, or BS standards. Knowing how these grades match across systems makes it much easier for engineers and suppliers to pick compatible stainless steel nuts and bolts for global projects. Below is a unified comparison table showing the most common 304\/316\/310\/410\/431 grade equivalents across major standards.<\/p>\n<h3><strong>Unified Global Stainless Steel Grade Comparison<\/strong><\/h3>\n<table>\n<tbody>\n<tr>\n<td><strong><b>Common Grade<\/b><\/strong><\/td>\n<td><strong><b>EN Number<\/b><\/strong><\/td>\n<td><strong><b>ASTM \/ AISI<\/b><\/strong><\/td>\n<td><strong><b>UNS<\/b><\/strong><\/td>\n<td><strong><b>British Standard<\/b><\/strong><\/td>\n<td><strong><b>DIN<\/b><\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>304<\/strong><\/td>\n<td>1.4301<\/td>\n<td>ASTM A193 B8<\/td>\n<td>S30400<\/td>\n<td>BS 970<\/td>\n<td>X5CrNi18-10<\/td>\n<\/tr>\n<tr>\n<td><strong>304L<\/strong><\/td>\n<td>1.4306<\/td>\n<td>ASTM A320 B8<\/td>\n<td>S30403<\/td>\n<td>BS 970<\/td>\n<td>X2CrNi19-11<\/td>\n<\/tr>\n<tr>\n<td><strong>316<\/strong><\/td>\n<td>1.4401<\/td>\n<td>ASTM A193 B8M<\/td>\n<td>S31600<\/td>\n<td>BS 970<\/td>\n<td>X5CrNiMo17-13-2<\/td>\n<\/tr>\n<tr>\n<td><strong>316L<\/strong><\/td>\n<td>1.4404<\/td>\n<td>ASTM A320 B8M<\/td>\n<td>S31603<\/td>\n<td>BS 970<\/td>\n<td>X2CrNiMo17-13-2<\/td>\n<\/tr>\n<tr>\n<td><strong>310<\/strong><\/td>\n<td>1.4841<\/td>\n<td>ASTM A479<\/td>\n<td>S31000<\/td>\n<td>BS 970<\/td>\n<td>X12CrNi25-21<\/td>\n<\/tr>\n<tr>\n<td><strong>310S<\/strong><\/td>\n<td>1.4845<\/td>\n<td>\u2014<\/td>\n<td>S31008<\/td>\n<td>BS 970<\/td>\n<td>X12CrNi25-21<\/td>\n<\/tr>\n<tr>\n<td><strong>410<\/strong><\/td>\n<td>1.4006<\/td>\n<td>\u2014<\/td>\n<td>S41000<\/td>\n<td>BS 970<\/td>\n<td>X10Cr13<\/td>\n<\/tr>\n<tr>\n<td><strong>431<\/strong><\/td>\n<td>1.4057<\/td>\n<td>\u2014<\/td>\n<td>S43100<\/td>\n<td>BS 970<\/td>\n<td>X20CrNi17-2<\/td>\n<\/tr>\n<tr>\n<td><strong>316S31<\/strong><\/td>\n<td>1.4401<\/td>\n<td>ASTM A193 B8M<\/td>\n<td>S31600<\/td>\n<td>BS 970<\/td>\n<td>X5CrNiMo17-12-2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><strong><b>What Stainless Steel Bolt Grades Do We Commonly Supply?<\/b><\/strong><\/h2>\n<p>At Welleshaft, we specialize in sourcing and inspecting a wide range of stainless steel fasteners:<\/p>\n<ul>\n<li>18-8 Stainless Steel: Standard corrosion resistance and mechanical performance.<\/li>\n<li>305 Stainless Steel: Slightly lower corrosion resistance than 304 but cost-effective.<\/li>\n<li>316 Stainless Steel: Marine-grade and chemical-resistant fasteners.<\/li>\n<li>410 Stainless Steel: Martensitic, high-strength ss nut bolts for industrial machinery.<\/li>\n<\/ul>\n<p>These grades cover most stainless steel hardware supplier\u00a0requests for industrial, automotive, and MRO components.<\/p>\n<h2><strong><b>What Are the Specifications for SS 304 Stainless Steel Fasteners?<\/b><\/strong><\/h2>\n<p>SS 304 fasteners are popular because they strike a solid balance between corrosion resistance, durability, and cost. They\u2019re suitable for a wide range of applications, including stainless steel nuts<strong>, <\/strong>ss bolts, washers, barrel nuts, jack nuts, and screws. Typical mechanical specs include a tensile strength of 520\u2013750 MPa and hardness around 70\u201390 HRB. Threads usually follow Unified Thread Standard (UTS)\u00a0or metric sizes. Choosing the right specification ensures your fasteners can handle both mechanical stress and environmental exposure, whether for industrial machinery, construction, or general hardware.<\/p>\n<p>Below is a practical size guide covering common 304 stainless fasteners:<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong><b>Fastener Type<\/b><\/strong><\/td>\n<td><strong><b>Size Range<\/b><\/strong><\/td>\n<td><strong><b>Length Range<\/b><\/strong><\/td>\n<td><strong><b>Standard Compliance<\/b><\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>304 Stainless Nuts<\/strong><\/td>\n<td>M3 \u2013 M56<\/td>\n<td>3\/16&#8243; \u2013 2&#8243;<\/td>\n<td>DIN, ASTM, BS, International Standards<\/td>\n<\/tr>\n<tr>\n<td><strong>304 SS Bolts \/ Screws<\/strong><\/td>\n<td>M3 \u2013 M56<\/td>\n<td>3 mm \u2013 200 mm<\/td>\n<td>ASTM A193 \/ A194, ASME SA193 \/ SA194<\/td>\n<\/tr>\n<tr>\n<td><strong>304 Stainless Screws<\/strong><\/td>\n<td>M1.6 \u2013 M12<\/td>\n<td>\u2014<\/td>\n<td>DIN, ASTM, BS<\/td>\n<\/tr>\n<tr>\n<td><strong>304 SS Washers<\/strong><\/td>\n<td>M3 \u2013 M56<\/td>\n<td>3\/16&#8243; \u2013 2&#8243;<\/td>\n<td>DIN, ASTM, BS<\/td>\n<\/tr>\n<tr>\n<td><strong>Stainless Steel Grade<\/strong><\/td>\n<td>SS 304<\/td>\n<td>\u2014<\/td>\n<td>\u2014<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Using this guide, engineers and procurement teams can quickly select the right SS 304 fastener\u00a0for industrial, marine, or general-purpose applications without worrying about mismatched threads or inadequate mechanical strength.<\/p>\n<h2><strong><b>Wha<\/b><\/strong><strong><b>t Types of SS 304 Bolts and Nuts Are Available?<\/b><\/strong><\/h2>\n<p>From hex bolts\u00a0to acorn nuts, SS 304 fasteners\u00a0cover a wide range:<\/p>\n<ul>\n<li>Hex bolts, socket head cap screws<\/li>\n<li>Button head bolts and pan head screws<\/li>\n<li>Barrel nuts and threaded rods<\/li>\n<li>Acorn and cap nuts<\/li>\n<li>Metric and imperial sizes<\/li>\n<\/ul>\n<p>This variety ensures compatibility with diverse steel nuts and bolts\u00a0applications in machinery, construction, and industrial assembly.<\/p>\n<h2><strong><b>What Are the Standard Dimensions of 304 Stainless Steel Hex Bolts?<\/b><\/strong><\/h2>\n<p>304 stainless steel hex bolts are versatile and widely used in industrial, structural, and assembly applications. Standard diameters range from M3 to M30\u00a0(or 1\/4\u201d\u20131 1\/2\u201d) with lengths from 10\u2013300 mm. Threads are usually coarse, but fine threads are available for precision adjustments. Using the correct diameter, thread pitch, and length is crucial to ensure proper torque, structural integrity, and durability for stainless steel bolts and nuts.<\/p>\n<p>Here\u2019s a detailed size guide for common SS 304 hex bolts:<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong><b>Nominal Size (D)<\/b><\/strong><\/td>\n<td><strong><b>Thread Pitch<\/b><\/strong><\/td>\n<td><strong><b>Length Range<\/b><\/strong><\/td>\n<td><strong><b>Application<\/b><\/strong><\/td>\n<td><strong><b>Body Diameter (Min\u2013Max mm)<\/b><\/strong><\/td>\n<td><strong><b>Head Thickness (Min\u2013Max mm)<\/b><\/strong><\/td>\n<td><strong><b>Flats (Min\u2013Max mm)<\/b><\/strong><\/td>\n<td><strong><b>Corners (Min\u2013Max mm)<\/b><\/strong><\/td>\n<\/tr>\n<tr>\n<td>M6 \/ 1\/4&#8243;<\/td>\n<td>1.0 mm \/ 13 TPI<\/td>\n<td>10\u2013100 mm \/ 1\u20136\u201d<\/td>\n<td>Small assemblies \/ Structural<\/td>\n<td>5.78\u20136.00<\/td>\n<td>6.17\u20136.63<\/td>\n<td>15.73\u201317.00<\/td>\n<td>17.77\u201318.48<\/td>\n<\/tr>\n<tr>\n<td>M12 \/ 1\/2&#8243;<\/td>\n<td>1.75 mm \/ 13 TPI<\/td>\n<td>50\u2013200 mm \/ 1\u20136\u201d<\/td>\n<td>Industrial machinery \/ Structural<\/td>\n<td>11.73\u201312.00<\/td>\n<td>4.24\u20137.76<\/td>\n<td>17.73\u201319.00<\/td>\n<td>20.03\u201320.78<\/td>\n<\/tr>\n<tr>\n<td>M14<\/td>\n<td>2.0 mm<\/td>\n<td>50\u2013200 mm<\/td>\n<td>General machinery<\/td>\n<td>13.73\u201314.00<\/td>\n<td>8.51\u20139.09<\/td>\n<td>20.67\u201322.00<\/td>\n<td>23.35\u201324.25<\/td>\n<\/tr>\n<tr>\n<td>M16<\/td>\n<td>2.0 mm<\/td>\n<td>50\u2013200 mm<\/td>\n<td>Heavy assemblies<\/td>\n<td>15.73\u201316.00<\/td>\n<td>9.68\u201310.32<\/td>\n<td>23.67\u201324.00<\/td>\n<td>26.75\u201327.71<\/td>\n<\/tr>\n<tr>\n<td>M20<\/td>\n<td>2.5 mm<\/td>\n<td>50\u2013200 mm<\/td>\n<td>Structural bolts<\/td>\n<td>19.67\u201320.00<\/td>\n<td>12.12\u201312.88<\/td>\n<td>29.16\u201330.00<\/td>\n<td>32.95\u201334.64<\/td>\n<\/tr>\n<tr>\n<td>M24<\/td>\n<td>3.0 mm<\/td>\n<td>50\u2013200 mm<\/td>\n<td>Large machinery<\/td>\n<td>23.67\u201324.00<\/td>\n<td>14.56\u201315.44<\/td>\n<td>35.00\u201336.00<\/td>\n<td>39.55\u201341.57<\/td>\n<\/tr>\n<tr>\n<td>M30<\/td>\n<td>3.5 mm<\/td>\n<td>50\u2013200 mm<\/td>\n<td>Industrial construction<\/td>\n<td>29.67\u201330.00<\/td>\n<td>17.92\u201319.48<\/td>\n<td>45.00\u201346.00<\/td>\n<td>50.85\u201353.12<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For sizes above M30, dimensions scale similarly. Selecting the right diameter, thread pitch, and head size is key to maintain torque performance and ensure bolts fit precisely in assemblies.<\/p>\n<h2><strong><b>What Is the Dimension Standard for 304 Stainless Steel Nuts?<\/b><\/strong><\/h2>\n<p>304 stainless steel nuts are widely used because they combine good corrosion resistance with reliability, making them a perfect match for stainless steel bolts, ss fasteners, or threaded rods. Standard hex nuts follow ISO, DIN, or ANSI\u00a0standards and come in both metric (M6\u2013M30) and imperial (1\/4\u201d\u20131 1\/2\u201d) sizes. Thickness is generally based on the thread diameter, and nuts can have hex head, flange, or acorn designs. Choosing the correct size ensures proper fit, structural integrity, and torque performance in assemblies, whether for machinery, construction, or general hardware.<\/p>\n<p>Here\u2019s a practical size chart for common 304 stainless steel hex nuts:<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong><b>Nominal Size<\/b><\/strong><\/td>\n<td><strong><b>Width Across Flats (F, min\u2013max)<\/b><\/strong><\/td>\n<td><strong><b>Width Across Corners (G, min\u2013max)<\/b><\/strong><\/td>\n<td><strong><b>Thickness (H, min\u2013max)<\/b><\/strong><\/td>\n<\/tr>\n<tr>\n<td>1\/4&#8243; (M6)<\/td>\n<td>0.250 \u2013 0.312<\/td>\n<td>0.488 \u2013 0.577<\/td>\n<td>0.218 \u2013 0.250<\/td>\n<\/tr>\n<tr>\n<td>5\/16&#8243; (M8)<\/td>\n<td>0.312 \u2013 0.375<\/td>\n<td>0.546 \u2013 0.650<\/td>\n<td>0.280 \u2013 0.314<\/td>\n<\/tr>\n<tr>\n<td>3\/8&#8243; (M10)<\/td>\n<td>0.375 \u2013 0.438<\/td>\n<td>0.669 \u2013 0.794<\/td>\n<td>0.341 \u2013 0.377<\/td>\n<\/tr>\n<tr>\n<td>7\/16&#8243; (M11)<\/td>\n<td>0.437 \u2013 0.500<\/td>\n<td>0.728 \u2013 0.866<\/td>\n<td>0.403 \u2013 0.441<\/td>\n<\/tr>\n<tr>\n<td>1\/2&#8243; (M12)<\/td>\n<td>0.500 \u2013 0.562<\/td>\n<td>0.850 \u2013 1.010<\/td>\n<td>0.464 \u2013 0.504<\/td>\n<\/tr>\n<tr>\n<td>9\/16&#8243; (M14)<\/td>\n<td>0.562 \u2013 0.625<\/td>\n<td>0.909 \u2013 1.083<\/td>\n<td>0.526 \u2013 0.568<\/td>\n<\/tr>\n<tr>\n<td>5\/8&#8243; (M16)<\/td>\n<td>0.625 \u2013 0.688<\/td>\n<td>1.031 \u2013 1.227<\/td>\n<td>0.587 \u2013 0.631<\/td>\n<\/tr>\n<tr>\n<td>3\/4&#8243; (M20)<\/td>\n<td>0.750 \u2013 0.812<\/td>\n<td>1.212 \u2013 1.443<\/td>\n<td>0.710 \u2013 0.758<\/td>\n<\/tr>\n<tr>\n<td>7\/8&#8243; (M22)<\/td>\n<td>0.875 \u2013 0.938<\/td>\n<td>1.394 \u2013 1.660<\/td>\n<td>0.833 \u2013 0.885<\/td>\n<\/tr>\n<tr>\n<td>1&#8243; (M24)<\/td>\n<td>1.000 \u2013 1.062<\/td>\n<td>1.575 \u2013 1.876<\/td>\n<td>0.956 \u2013 1.012<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Larger sizes continue similarly up to 4&#8243; (M100). Using the correct width across flats, corner, and thickness is essential to ensure proper torque, prevent loosening, and maintain safety in any stainless steel assembly.<\/p>\n<h2><strong><b>What Is the Size Chart for AISI 304 Stainless Steel Fasteners?<\/b><\/strong><\/h2>\n<p>Selecting the right <a href=\"https:\/\/welleshaft.com\/en\/ss-fasteners\/\"><strong>stainless steel fastners<\/strong><\/a> is crucial for any industrial or commercial project. Using proper dimensions prevents mismatched ss nut bolts, ensures safe mechanical assembly, and keeps your machinery or structures secure. A complete size chart helps engineers and procurement teams pick the right fastener quickly, whether it\u2019s a hex bolt, socket head cap screw, or hex nut. Standard lengths and diameters vary depending on the fastener type, but material is usually 304 stainless steel for its balance of corrosion resistance and strength.<\/p>\n<p>Here\u2019s a practical size guide covering common 304 SS bolts and nuts:<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong><b>Fastener Type<\/b><\/strong><\/td>\n<td><strong><b>Thread Diameter<\/b><\/strong><\/td>\n<td><strong><b>Standard Length<\/b><\/strong><\/td>\n<td><strong><b>Material<\/b><\/strong><\/td>\n<\/tr>\n<tr>\n<td>Hex Bolt<\/td>\n<td>M6<\/td>\n<td>20\u2013100 mm<\/td>\n<td>304 SS<\/td>\n<\/tr>\n<tr>\n<td>Hex Nut<\/td>\n<td>M6<\/td>\n<td>5 mm<\/td>\n<td>304 SS<\/td>\n<\/tr>\n<tr>\n<td>Socket Head Cap Screw<\/td>\n<td>M8<\/td>\n<td>16\u201380 mm<\/td>\n<td>304 SS<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For nuts specifically, here\u2019s a more detailed breakdown by type and height:<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong><b>Nut Size (mm)<\/b><\/strong><\/td>\n<td><strong><b>Diameter (mm)<\/b><\/strong><\/td>\n<td><strong><b>Hex Nut Height (mm)<\/b><\/strong><\/td>\n<td><strong><b>Jam Nut Height (mm)<\/b><\/strong><\/td>\n<td><strong><b>Nylock Nut Height (mm)<\/b><\/strong><\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>4<\/td>\n<td>1.6<\/td>\n<td>1.2<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>2.5<\/td>\n<td>5<\/td>\n<td>2<\/td>\n<td>1.6<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>5.5<\/td>\n<td>2.4<\/td>\n<td>1.8<\/td>\n<td>4<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>7<\/td>\n<td>3.2<\/td>\n<td>2.2<\/td>\n<td>5<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>8<\/td>\n<td>4<\/td>\n<td>2.7<\/td>\n<td>5<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>10<\/td>\n<td>5<\/td>\n<td>3.2<\/td>\n<td>6<\/td>\n<\/tr>\n<tr>\n<td>7<\/td>\n<td>11<\/td>\n<td>5.5<\/td>\n<td>3.5<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>13<\/td>\n<td>6.5<\/td>\n<td>4<\/td>\n<td>8<\/td>\n<\/tr>\n<tr>\n<td>10<\/td>\n<td>17<\/td>\n<td>8<\/td>\n<td>5<\/td>\n<td>10<\/td>\n<\/tr>\n<tr>\n<td>12<\/td>\n<td>19<\/td>\n<td>10<\/td>\n<td>6<\/td>\n<td>12<\/td>\n<\/tr>\n<tr>\n<td>14<\/td>\n<td>22<\/td>\n<td>11<\/td>\n<td>7<\/td>\n<td>14<\/td>\n<\/tr>\n<tr>\n<td>16<\/td>\n<td>24<\/td>\n<td>13<\/td>\n<td>8<\/td>\n<td>16<\/td>\n<\/tr>\n<tr>\n<td>18<\/td>\n<td>27<\/td>\n<td>15<\/td>\n<td>9<\/td>\n<td>18.5<\/td>\n<\/tr>\n<tr>\n<td>20<\/td>\n<td>30<\/td>\n<td>16<\/td>\n<td>10<\/td>\n<td>20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Referencing these charts makes it easier to pick the right 304 SS nut or bolt for your project, ensuring a secure fit and reliable performance, whether in industrial equipment, construction, or general mechanical assemblies.<\/p>\n<h2><strong><b>What Is the UNS S30400 Bolt Torque Chart?<\/b><\/strong><\/h2>\n<p>For proper assembly, knowing the torque values for stainless steel bolts is crucial. Correct torque prevents bolt or nut failure and ensures the fasteners perform reliably in industrial applications. Below is a combined, easy-to-use torque guide for UNS S30400 (304) and 316 stainless steel bolts.<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong><b>Bolt Size<\/b><\/strong><\/td>\n<td><strong><b>Threads Per Inch<\/b><\/strong><\/td>\n<td><strong><b>Recommended Torque (304 SS, Nm)<\/b><\/strong><\/td>\n<td><strong><b>Recommended Torque (316 SS, Nm)<\/b><\/strong><\/td>\n<td><strong><b>Notes<\/b><\/strong><\/td>\n<\/tr>\n<tr>\n<td>M6<\/td>\n<td>&#8211;<\/td>\n<td>10<\/td>\n<td>10<\/td>\n<td>Coarse thread<\/td>\n<\/tr>\n<tr>\n<td>M8<\/td>\n<td>&#8211;<\/td>\n<td>25<\/td>\n<td>25<\/td>\n<td>Standard torque<\/td>\n<\/tr>\n<tr>\n<td>M12<\/td>\n<td>&#8211;<\/td>\n<td>70<\/td>\n<td>70<\/td>\n<td>High-load applications<\/td>\n<\/tr>\n<tr>\n<td>#2<\/td>\n<td>56<\/td>\n<td>0.28<\/td>\n<td>0.30<\/td>\n<td>Small screws<\/td>\n<\/tr>\n<tr>\n<td>#2<\/td>\n<td>64<\/td>\n<td>0.34<\/td>\n<td>0.36<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>#3<\/td>\n<td>48<\/td>\n<td>0.44<\/td>\n<td>0.46<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>#3<\/td>\n<td>56<\/td>\n<td>0.50<\/td>\n<td>0.52<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>#4<\/td>\n<td>40<\/td>\n<td>0.59<\/td>\n<td>0.62<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>#4<\/td>\n<td>48<\/td>\n<td>0.75<\/td>\n<td>0.78<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>#5<\/td>\n<td>40<\/td>\n<td>0.87<\/td>\n<td>0.91<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>#5<\/td>\n<td>44<\/td>\n<td>1.06<\/td>\n<td>1.11<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>#6<\/td>\n<td>32<\/td>\n<td>1.09<\/td>\n<td>1.15<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>#6<\/td>\n<td>40<\/td>\n<td>1.38<\/td>\n<td>1.45<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>#8<\/td>\n<td>32<\/td>\n<td>2.85<\/td>\n<td>2.97<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>#8<\/td>\n<td>36<\/td>\n<td>3.16<\/td>\n<td>3.30<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>#10<\/td>\n<td>24<\/td>\n<td>3.28<\/td>\n<td>3.43<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>#10<\/td>\n<td>32<\/td>\n<td>4.55<\/td>\n<td>4.75<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>1\/4&#8243;<\/td>\n<td>20<\/td>\n<td>8.5<\/td>\n<td>8.9<\/td>\n<td>Standard inch bolt<\/td>\n<\/tr>\n<tr>\n<td>1\/4&#8243;<\/td>\n<td>28<\/td>\n<td>10.6<\/td>\n<td>11.2<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>5\/16&#8243;<\/td>\n<td>18<\/td>\n<td>15.0<\/td>\n<td>15.7<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>5\/16&#8243;<\/td>\n<td>24<\/td>\n<td>16.1<\/td>\n<td>16.7<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>3\/8&#8243;<\/td>\n<td>16<\/td>\n<td>27.0<\/td>\n<td>28.3<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>3\/8&#8243;<\/td>\n<td>24<\/td>\n<td>29.7<\/td>\n<td>31.0<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>7\/16&#8243;<\/td>\n<td>14<\/td>\n<td>42.9<\/td>\n<td>44.8<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>7\/16&#8243;<\/td>\n<td>20<\/td>\n<td>45.3<\/td>\n<td>47.3<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>1\/2&#8243;<\/td>\n<td>13<\/td>\n<td>58.5<\/td>\n<td>61.3<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>1\/2&#8243;<\/td>\n<td>20<\/td>\n<td>61.3<\/td>\n<td>64.0<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>9\/16&#8243;<\/td>\n<td>12<\/td>\n<td>77.5<\/td>\n<td>81.0<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>9\/16&#8243;<\/td>\n<td>18<\/td>\n<td>85.3<\/td>\n<td>89.3<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>5\/8&#8243;<\/td>\n<td>11<\/td>\n<td>126<\/td>\n<td>132<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>5\/8&#8243;<\/td>\n<td>18<\/td>\n<td>141<\/td>\n<td>147<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>3\/4&#8243;<\/td>\n<td>10<\/td>\n<td>173<\/td>\n<td>179<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>3\/4&#8243;<\/td>\n<td>16<\/td>\n<td>168<\/td>\n<td>175<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>7\/8&#8243;<\/td>\n<td>9<\/td>\n<td>263<\/td>\n<td>274<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>7\/8&#8243;<\/td>\n<td>14<\/td>\n<td>262<\/td>\n<td>273<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>1&#8243;<\/td>\n<td>8<\/td>\n<td>389<\/td>\n<td>406<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>1&#8243;<\/td>\n<td>14<\/td>\n<td>352<\/td>\n<td>368<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>1 1\/8&#8243;<\/td>\n<td>7<\/td>\n<td>445<\/td>\n<td>466<\/td>\n<td>Large inch bolt<\/td>\n<\/tr>\n<tr>\n<td>1 1\/8&#8243;<\/td>\n<td>12<\/td>\n<td>420<\/td>\n<td>440<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>1 1\/4&#8243;<\/td>\n<td>7<\/td>\n<td>564<\/td>\n<td>589<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>1 1\/4&#8243;<\/td>\n<td>12<\/td>\n<td>518<\/td>\n<td>544<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>1 1\/2&#8243;<\/td>\n<td>6<\/td>\n<td>957<\/td>\n<td>1,003<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>1 1\/2&#8243;<\/td>\n<td>12<\/td>\n<td>757<\/td>\n<td>789<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><strong><b>What Is the Composition of 304 Stainless Steel Threaded Rods?<\/b><\/strong><\/h2>\n<p>304 stainless steel rods and fasteners are widely used because of their excellent corrosion resistance, good durability, and moderate mechanical strength. Here\u2019s a quick look at what makes them special:<\/p>\n<p><strong>Chromium (Cr):<\/strong>\u00a018\u201320% \u2013 gives corrosion resistance and strength<\/p>\n<p><strong>Nickel (Ni):<\/strong>\u00a08\u201310.5% \u2013 adds toughness and prevents rust<\/p>\n<p><strong>Carbon (C):<\/strong>\u00a0\u22640.08% \u2013 keeps the steel strong but not brittle<\/p>\n<p><strong>Manganese (Mn):<\/strong>\u00a0\u22642% \u2013 improves hardness and wear resistance<\/p>\n<p><strong>Silicon (Si):<\/strong>\u00a0\u22640.75% \u2013 enhances durability<\/p>\n<p><strong>Phosphorus (P):<\/strong>\u00a0\u22640.045% \u2013 trace amounts, keeps steel ductile<\/p>\n<p><strong>Sulfur (S):<\/strong>\u00a0\u22640.03% \u2013 small amounts to aid machining<\/p>\n<p><strong>Nitrogen (N):<\/strong>\u00a0\u22640.10% \u2013 boosts strength slightly<\/p>\n<p>Here\u2019s a handy table summarizing the composition:<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong><b>Element<\/b><\/strong><\/td>\n<td><strong><b>Typical Range (%)<\/b><\/strong><\/td>\n<td><strong><b>Notes<\/b><\/strong><\/td>\n<\/tr>\n<tr>\n<td>Carbon (C)<\/td>\n<td>\u22640.08<\/td>\n<td>Low carbon for moderate strength<\/td>\n<\/tr>\n<tr>\n<td>Manganese (Mn)<\/td>\n<td>\u22642.0<\/td>\n<td>Improves hardness<\/td>\n<\/tr>\n<tr>\n<td>Silicon (Si)<\/td>\n<td>\u22640.75<\/td>\n<td>Enhances durability<\/td>\n<\/tr>\n<tr>\n<td>Phosphorus (P)<\/td>\n<td>\u22640.045<\/td>\n<td>Trace amount, maintains ductility<\/td>\n<\/tr>\n<tr>\n<td>Sulfur (S)<\/td>\n<td>\u22640.03<\/td>\n<td>Small amount to improve machinability<\/td>\n<\/tr>\n<tr>\n<td>Chromium (Cr)<\/td>\n<td>18\u201320<\/td>\n<td>Main contributor to corrosion resistance<\/td>\n<\/tr>\n<tr>\n<td>Molybdenum (Mo)<\/td>\n<td>&#8211;<\/td>\n<td>Not significant in 304<\/td>\n<\/tr>\n<tr>\n<td>Nickel (Ni)<\/td>\n<td>8\u201310.5<\/td>\n<td>Adds toughness and corrosion resistance<\/td>\n<\/tr>\n<tr>\n<td>Nitrogen (N)<\/td>\n<td>\u22640.10<\/td>\n<td>Slight strength improvement<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Tip: Because of this balanced composition, 304 stainless steel bolts, rods, and studs are durable, resist rust well, and are suitable for most industrial and construction applications.<\/p>\n<h2><strong><b>How Are SS 304 Hex Bolts Analyzed Mechanically?<\/b><\/strong><\/h2>\n<p>When working with 304 stainless steel hex bolts, several mechanical tests are done to make sure they\u2019re strong, durable, and meet industrial standards. These include:<\/p>\n<p>Tensile testing\u00a0\u2013 measures how much pulling force the bolt can handle before breaking<\/p>\n<p>Hardness testing\u00a0\u2013 usually Rockwell B or Brinell methods, to check surface strength<\/p>\n<p>Impact testing (Charpy)\u00a0\u2013 ensures bolts can withstand sudden shocks<\/p>\n<p>Fatigue and torque performance\u00a0\u2013 confirms the bolt holds up under repeated stress and twisting<\/p>\n<p>Here\u2019s a quick summary of the typical mechanical properties for 304 stainless steel bolts:<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong><b>Property<\/b><\/strong><\/td>\n<td><strong><b>Value<\/b><\/strong><\/td>\n<td><strong><b>Notes<\/b><\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>Tensile Strength<\/strong><\/td>\n<td>\u2265515 MPa<\/td>\n<td>Maximum load before breaking<\/td>\n<\/tr>\n<tr>\n<td><strong>Yield Strength (0.2% Proof)<\/strong><\/td>\n<td>\u2265205 MPa<\/td>\n<td>Load at which the bolt starts to deform permanently<\/td>\n<\/tr>\n<tr>\n<td><strong>Elongation<\/strong><\/td>\n<td>\u226540% (in 50 mm)<\/td>\n<td>Measures ductility, how much it can stretch before breaking<\/td>\n<\/tr>\n<tr>\n<td><strong>Hardness (Rockwell B, HR B)<\/strong><\/td>\n<td>\u226492<\/td>\n<td>Surface hardness limit<\/td>\n<\/tr>\n<tr>\n<td><strong>Hardness (Brinell, HB)<\/strong><\/td>\n<td>\u2264201<\/td>\n<td>Alternative hardness test<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Tip: Running these tests ensures your 304 SS bolts are safe, reliable, and meet international bolt grade requirements. Perfect for industrial and construction applications where strength and durability matter.<\/p>\n<h2><strong><b>What Materials Are Equivalent to 304 Stainless Steel Studs?<\/b><\/strong><\/h2>\n<p>When selecting stainless steel studs, it\u2019s useful to know equivalent materials and standards. Choosing the right one ensures your studs match performance expectations and are compatible with nuts and bolts.<\/p>\n<p>Common equivalents and alternatives:<\/p>\n<p>18-8 Stainless Steel Studs\u00a0\u2013 Offers similar corrosion resistance as 304 SS, usually a bit cheaper.<\/p>\n<p>316 Stainless Steel Studs\u00a0\u2013 Higher corrosion resistance, ideal for marine or highly corrosive environments.<\/p>\n<p>Other Austenitic Alloys\u00a0\u2013 Custom stainless steel fasteners for industrial, automotive, or specialized applications.<\/p>\n<p>Standard Equivalents for 304 Stainless Steel:<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong><b>AISI Grade<\/b><\/strong><\/td>\n<td><strong><b>JIS Equivalent<\/b><\/strong><\/td>\n<td><strong><b>Stainless Steel Notation<\/b><\/strong><\/td>\n<td><strong><b>EN\/DIN Numerical<\/b><\/strong><\/td>\n<td><strong><b>UNS Designation<\/b><\/strong><\/td>\n<td><strong><b>EN\/DIN Symbolic Equivalent<\/b><\/strong><\/td>\n<\/tr>\n<tr>\n<td>304<\/td>\n<td>SUS304<\/td>\n<td>SS 304<\/td>\n<td>EN 1.4301<\/td>\n<td>UNS S30400<\/td>\n<td>X4CrNi18-10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><strong><b>SS <\/b><\/strong><strong><b>Nuts and Bolts<\/b><\/strong><strong><b>\u00a0<\/b><\/strong><strong><b>FAQ<\/b><\/strong><strong><b>\u2019<\/b><\/strong><strong><b>S<\/b><\/strong><\/h2>\n<h4><strong><b>What Are the Differences Between 304 and 316 Stainless Steel Fasteners?<\/b><\/strong><\/h4>\n<p>304 is more cost-effective, suitable for most general applications. 316 offers superior corrosion resistance, ideal for<strong> chemical, marine, and outdoor fasteners<\/strong>.<\/p>\n<h4><strong><b>How Can I Verify the Grade of Stainless Steel Bolts?<\/b><\/strong><\/h4>\n<p>Visual inspection, magnet tests, and lab chemical analysis help distinguish grades. Welleshaft inspections\u00a0ensure your bolts meet certified ss bolt grades.<\/p>\n<h4><strong><b>Can Welleshaft Help With Custom Stainless Steel Nut and Bolt Requirements?<\/b><\/strong><\/h4>\n<p>Yes, we provide inspection, sourcing, and custom fastener solutions, from stainless steel nuts bolts\u00a0to high-strength ss studs, tailored to industrial or commercial needs.<\/p>\n<h2><strong><b>How to Choose the Right Stainless Steel Bolt and Nut Grade for Industrial Use?<\/b><\/strong><\/h2>\n<p>Consider these factors when selecting ss bolts and nuts:<\/p>\n<ul>\n<li>Environment: 316 SS for marine or chemical exposure<\/li>\n<li>Mechanical load: Martensitic bolts for high-stress machinery<\/li>\n<li>Compatibility: Match nuts and bolts by grade to avoid galvanic corrosion<\/li>\n<li>Industry standards: Refer to ASTM, ISO, or SAE bolt grades charts<\/li>\n<\/ul>\n<p>Selecting the right grade reduces maintenance costs and ensures operational safety.<\/p>\n<h2><strong><b>Why Choose Welleshaft for Stainless Steel Fastener Sourcing?<\/b><\/strong><\/h2>\n<p><a href=\"https:\/\/welleshaft.com\/en\/\"><strong>Welleshaft<\/strong><\/a> specializes in helping manufacturers and industrial clients source high-quality stainless steel fasteners with confidence. We handle everything from supplier qualification and factory audits to custom sourcing of nuts, bolts, studs, and other components for automotive, industrial, and MRO applications. Our team ensures all fasteners meet international standards for strength, durability, and corrosion resistance, including 304, 316, and martensitic grades. By combining hands-on manufacturing knowledge with rigorous inspection processes, we help clients reduce production risks, maintain consistent quality, and streamline their supply chain for reliable, ready-to-use stainless steel fasteners.<\/p>\n<div class=\"message-box relative dark\" style=\"padding-top:15px;padding-bottom:15px;\"><div class=\"message-box-bg-image bg-fill fill\" style=\"background-image:url(https:\/\/welleshaft.com\/wp-content\/uploads\/2025\/12\/1.SS-Nuts-And-Bolts-welleshaft.webp);\"><\/div><div class=\"message-box-bg-overlay bg-fill fill\" style=\"background-color:rgba(7, 1, 1, 0.291);\"><\/div><div class=\"container relative\"><div class=\"inner last-reset\">\n<div class=\"row align-middle align-center\"  id=\"row-206587958\">\n\n\t<div id=\"col-1825322085\" class=\"col medium-6 small-12 large-6\"  >\n\t\t\t\t<div class=\"col-inner text-center\"  >\n\t\t\t\n\t\t\t\n<a href=\"https:\/\/welleshaft.com\/en\/get-in-touch-with-welleshaft-your-engineering-and-manufacturing-partner\/\" class=\"button alert is-outline\"  style=\"border-radius:99px;\">\n    <span>Get Custom SS Nuts &amp; Bolts<\/span>\n  <\/a>\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<\/div><\/div><\/div>\n<p>This blog was provided by the <strong>Welleshaft<\/strong> Engineering Team, led by Mr. Xu, a specialist with 20 years of experience in industrial fastener inspection and sourcing. Welleshaft helps clients worldwide procure reliable stainless steel fasteners, perform quality audits, and ensure compliance with international standards for industrial, automotive, and MRO applications.<\/p>","protected":false},"excerpt":{"rendered":"<p>Stainless Steel Nuts and Bolts: Grades, Standards, and Sourcing Guide What Are the Main Stainless Steel Material Grades for Nuts and Bolts? SS Nuts And Bolts come in various grades, each with unique characteristics, making it essential to choose the right material for durability and performance. The most common ones include 316, 410, 304 and [&#8230;]\n","protected":false},"author":1,"featured_media":6652,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[51,1],"tags":[593],"class_list":["post-6648","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-contract-manufacturing","category-study-cases-and-knowledge","tag-ss-nuts-and-bolts-contract-manufacturing"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SS Nuts And Bolts<\/title>\n<meta name=\"description\" content=\"Discover grades, standards, and sourcing tips for SS Nuts And Bolts. 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