{"id":97,"date":"2021-02-20T05:55:54","date_gmt":"2021-02-20T05:55:54","guid":{"rendered":"https:\/\/www.skytechrolling.com\/blog\/?p=97"},"modified":"2026-09-07T16:15:15","modified_gmt":"2026-09-07T10:45:15","slug":"stainless-steel-304-hex-bar-what-you-need-to-know","status":"publish","type":"post","link":"https:\/\/www.skytechrolling.com\/blog\/stainless-steel-304-hex-bar-what-you-need-to-know\/","title":{"rendered":"SS 304 Hex Bar: A Guide to Properties &#038; Applications"},"content":{"rendered":"<div class=\"ttr_start\"><\/div><p><span style=\"font-weight: 400;\">Stainless Steel 304 Hex Bar<\/span><span style=\"font-weight: 400;\"> is specified for machined parts, fasteners, fittings, and general engineering work where corrosion resistance and consistent mechanical performance are required. The grade is identified as UNS S30400 and EN 1.4301, with applicable ASTM and ASME specifications defining chemical, mechanical, dimensional, and testing requirements. Material selection should also consider the required condition and size.<\/span><\/p>\n<h2><b>What Is a Stainless Steel 304 Hex Bar?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A hex bar carries six flat sides around a central axis, giving a hexagonal cross-section instead of a round profile. Grade 304 is an austenitic stainless steel, and the flat faces let a wrench or collet grip the bar without slipping. Suppliers list <\/span><span style=\"font-weight: 400;\">stainless steel 304 hex bars<\/span><span style=\"font-weight: 400;\"> within their standard hex bar range alongside round and square sections. The grade resists corrosion in most atmospheric conditions and welds with standard austenitic filler wire.<\/span><\/p>\n<h2><b>Key Properties of Stainless Steel 304 Hex Bar<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The properties below decide how a 304 hex bar performs on a machine shop floor.<\/span><\/p>\n<ul>\n<li><b>Corrosion resistance<\/b><span style=\"font-weight: 400;\"> \u2013 Chromium forms a passive layer that resists rust in air, water, and mild chemicals.<\/span><\/li>\n<li><b>Strength<\/b><span style=\"font-weight: 400;\"> \u2013 Cold-drawn 304 can have higher strength than annealed material.<\/span><\/li>\n<li><b>Ductility<\/b><span style=\"font-weight: 400;\"> \u2013 A minimum elongation of 40 percent lets the bar bend without cracking.<\/span><\/li>\n<li><b>Formability<\/b><span style=\"font-weight: 400;\"> \u2013 The bar cold forms into brackets and fittings without a separate annealing step.<\/span><\/li>\n<li><b>Weldability<\/b><span style=\"font-weight: 400;\"> \u2013 Standard TIG or MIG welding with 308 filler joins the bar without special preheat.<\/span><\/li>\n<li><b>Machinability<\/b><span style=\"font-weight: 400;\"> \u2013 Flat faces grip cleanly in a collet, and the bar machines well with coolant.<\/span><\/li>\n<li><b>Temperature performance<\/b><span style=\"font-weight: 400;\"> \u2013 304 holds useful strength to around 870\u00b0C and resists scaling.<\/span><\/li>\n<\/ul>\n<h2><b>Stainless Steel 304 Hex Bar Chemical Composition<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Chemical limits for the 304 hex bar follow ASTM A276, and results vary within these ranges by heat.<\/span><\/p>\n<table>\n<thead>\n<tr>\n<th><b>Element<\/b><\/th>\n<th><b>Typical Range \/ Max (%)<\/b><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Chromium (Cr)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">18.0 \u2013 20.0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Nickel (Ni)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">8.0 \u2013 10.5<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Carbon (C)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2264 0.08<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Manganese (Mn)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2264 2.00<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Silicon (Si)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2264 1.00<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Phosphorus (P)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2264 0.045<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Sulphur (S)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2264 0.030<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Nitrogen (N)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2264 0.10<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Iron (Fe)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Balance<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Molybdenum (Mo)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Not added<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">Chromium and nickel set the corrosion resistance and structure, while low carbon limits carbide formation at welds.<\/span><\/p>\n<h2><b>Mechanical Properties of SS 304 Hex Bar<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">These values apply to the bar in the annealed condition per ASTM A276 and ASME SA479.<\/span><\/p>\n<table>\n<thead>\n<tr>\n<th><b>Property<\/b><\/th>\n<th><b>Typical Value (Annealed)<\/b><\/th>\n<th><b>Spec Reference<\/b><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Tensile strength<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2265 515 MPa (\u2265 75,000 psi)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASTM A276 \/ A479, Type 304<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Yield strength (0.2% offset)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2265 205 MPa (\u2265 30,000 psi)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASTM A276 \/ A479<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Elongation<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2265 40% in 50 mm (2 in.)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASTM A276 \/ A479<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Hardness<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2264 201 HB (\u2264 92 HRB)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASTM A276 \/ A479<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b>304 Stainless Steel Hex Bar Sizes and Dimensions<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Size selection starts with the across-flats measurement, which determines fit with collets and sockets.<\/span><\/p>\n<ul>\n<li><b>Across-flats dimension<\/b><span style=\"font-weight: 400;\"> \u2013 The distance between two parallel flat faces is used when ordering a hex bar.<\/span><\/li>\n<li><b>Length<\/b><span style=\"font-weight: 400;\"> \u2013 Standard mill lengths span 3 to 6 metres, with shorter cuts on request.<\/span><\/li>\n<li><b>Standard and custom sizes<\/b><span style=\"font-weight: 400;\"> \u2013 Common across-flats range from 6 mm to 50 mm, with larger sections cut to order.<\/span><\/li>\n<li><b>Dimensional tolerances<\/b><span style=\"font-weight: 400;\"> \u2013 ASTM A484 sets the tolerance class, and cold-drawn stock holds a tighter tolerance than a hot-finished bar.<\/span><\/li>\n<\/ul>\n<h2><b>Types and Finishes of 304 Hex Bars<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A few processing and finishing options exist, and the choice affects surface and cost.<\/span><\/p>\n<ul>\n<li><b>Cold-drawn hex bars<\/b><span style=\"font-weight: 400;\"> \u2013 Cold drawing tightens tolerances and raises strength, the common choice for precision stock.<\/span><\/li>\n<li><b>Hot-finished hex bars<\/b><span style=\"font-weight: 400;\"> \u2013 A hot-finished bar carries a rougher surface and looser tolerance and is used for larger sections.<\/span><\/li>\n<li><b>Polished \/ machined finishes<\/b><span style=\"font-weight: 400;\"> \u2013 A machined or polished surface removes mill scale from parts left visible in assembly.<\/span><\/li>\n<li><b>Bright bar finish<\/b><span style=\"font-weight: 400;\"> \u2013 Bright finish pairs cold drawing with a bright anneal, suited to food and pharma equipment.<\/span><\/li>\n<\/ul>\n<h2><b>How Are Stainless Steel 304 Hex Bars Manufactured?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Hex bar production moves through seven stages from raw billet to certified bar.<\/span><\/p>\n<ul>\n<li><b>Billet \/ raw material preparation<\/b><span style=\"font-weight: 400;\"> \u2013 Mills start from cast billet with chemistry checked against the 304 spec.<\/span><\/li>\n<li><b>Hot working<\/b><span style=\"font-weight: 400;\"> \u2013 The billet is hot-rolled or forged into the hex profile above 1000\u00b0C.<\/span><\/li>\n<li><b>Cold drawing where applicable<\/b><span style=\"font-weight: 400;\"> \u2013 Cold drawing pulls the hot-worked bar through a hex die to tighten size and raise strength.<\/span><\/li>\n<li><b>Straightening<\/b><span style=\"font-weight: 400;\"> \u2013 Roller or press straightening removes bow left from hot working or drawing.<\/span><\/li>\n<li><b>Cutting<\/b><span style=\"font-weight: 400;\"> \u2013 Bar is cut to stock or custom length on cold saws.<\/span><\/li>\n<li><b>Surface finishing<\/b><span style=\"font-weight: 400;\"> \u2013 Pickling, polishing, or bright annealing sets the final surface texture.<\/span><\/li>\n<li><b>Inspection<\/b><span style=\"font-weight: 400;\"> \u2013 Each lot is checked for chemistry, dimensions, and properties before certification.<\/span><\/li>\n<\/ul>\n<h2><b>What Are the Applications of Stainless Steel 304 Hex Bar?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">304 hex bar is used across eight industries where corrosion resistance and machinability both matter.<\/span><\/p>\n<ul>\n<li><b>Fasteners<\/b><span style=\"font-weight: 400;\"> \u2013 Hex bars become bolts, nuts, and studs, where the flats serve as the wrenching surface.<\/span><\/li>\n<li><b>Machined components<\/b><span style=\"font-weight: 400;\"> \u2013 Shops turn the bar into bushings, spacers, and fittings without a separate forming step.<\/span><\/li>\n<li><b>Valves and fittings<\/b><span style=\"font-weight: 400;\"> \u2013 Small valve bodies and fitting components draw on a hex bar for the flat gripping sections.<\/span><\/li>\n<li><b>Shafts and hardware<\/b><span style=\"font-weight: 400;\"> \u2013 Short shafts, pins, and hardware use the bar where a round profile is not needed.<\/span><\/li>\n<li><b>Food-processing equipment<\/b><span style=\"font-weight: 400;\"> \u2013 Fittings and fasteners in food plants use 304 hex bars for washdown resistance.<\/span><\/li>\n<li><b>Chemical equipment<\/b><span style=\"font-weight: 400;\"> \u2013 Hex bar forms fittings in chemical plants handling mild, non-chloride fluids.<\/span><\/li>\n<li><b>Architectural components<\/b><span style=\"font-weight: 400;\"> \u2013 Railings and brackets use the bar where flat faces suit bolted connections.<\/span><\/li>\n<li><b>General engineering<\/b><span style=\"font-weight: 400;\"> \u2013 Workshops keep 304 hex bars on hand for one-off fittings and repair parts.<\/span><\/li>\n<\/ul>\n<h2><b>304 Hex Bar vs 316 Hex Bar<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Both grades share a close mechanical profile, but molybdenum sets them apart in aggressive service.<\/span><\/p>\n<table>\n<thead>\n<tr>\n<th><b>Parameter<\/b><\/th>\n<th><b>304 Hex Bar (UNS S30400)<\/b><\/th>\n<th><b>316 Hex Bar (UNS S31600)<\/b><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Molybdenum<\/span><\/td>\n<td><span style=\"font-weight: 400;\">None<\/span><\/td>\n<td><span style=\"font-weight: 400;\">2 \u2013 3%<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Corrosion resistance<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Good in mild, indoor, and freshwater conditions<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Better in chloride-rich and marine environments<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Chloride tolerance<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Up to about 200 ppm at ambient temperature<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Up to about 1,000 ppm<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Typical use<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Indoor, architectural, and freshwater service<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Marine, coastal, and chemical process service<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b>How to Choose the Right 304 Hex Bar<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A few factors decide whether a 304 hex bar fits a job, worth checking before ordering.<\/span><\/p>\n<ul>\n<li><b>Required size<\/b><span style=\"font-weight: 400;\"> \u2013 Confirm the across-flats dimension and length, since custom cuts add lead time.<\/span><\/li>\n<li><b>Application<\/b><span style=\"font-weight: 400;\"> \u2013 Match the bar to its use, whether a fastener, a machined part, or hardware.<\/span><\/li>\n<li><b>Mechanical load<\/b><span style=\"font-weight: 400;\"> \u2013 Check the load against annealed yield strength and specify cold-drawn stock for higher strength.<\/span><\/li>\n<li><b>Corrosion environment<\/b><span style=\"font-weight: 400;\"> \u2013 Review chloride exposure, since 304 is not suited to saltwater or high-chloride fluids.<\/span><\/li>\n<li><b>Machining requirements<\/b><span style=\"font-weight: 400;\"> \u2013 Confirm whether the job needs a cold-drawn bar for tolerance or a hot-finished bar for rough machining.<\/span><\/li>\n<li><b>Finish<\/b><span style=\"font-weight: 400;\"> \u2013 Pick a bright or polished finish for visible parts and a mill finish for coated parts.<\/span><\/li>\n<li><b>Applicable ASTM \/ ASME \/ EN standard<\/b><span style=\"font-weight: 400;\"> \u2013 Specify ASTM A276, ASME SA479, or EN 10088 depending on the project and documentation needs.<\/span><\/li>\n<li><b>Material certification<\/b><span style=\"font-weight: 400;\"> \u2013 Request a mill test certificate with heat number, chemistry, and mechanical results before the order ships.<\/span><\/li>\n<\/ul>\n<div class=\"ttr_end\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Stainless Steel 304 Hex Bar is specified for machined parts, fasteners, fittings, and general engineering work where corrosion resistance and consistent mechanical performance are required. The grade is identified as UNS S30400 and EN 1.4301, with applicable ASTM and ASME specifications defining chemical, mechanical, dimensional, and testing requirements. Material selection should also consider the required&#8230;<\/p>\n","protected":false},"author":2,"featured_media":105,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[16,18,19,20,17,15],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SS 304 Hex Bar: A Guide to Properties &amp; Applications<\/title>\n<meta name=\"description\" content=\"A practical guide to 304 stainless steel hex bars covering properties, specifications, dimensions, applications, advantages and material selection.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.skytechrolling.com\/blog\/stainless-steel-304-hex-bar-what-you-need-to-know\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SS 304 Hex Bar: A Guide to Properties &amp; 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