{"id":5727,"date":"2026-05-14T17:08:56","date_gmt":"2026-05-14T09:08:56","guid":{"rendered":"https:\/\/xzfastener.com\/?post_type=product&p=5727"},"modified":"2026-05-14T17:11:03","modified_gmt":"2026-05-14T09:11:03","slug":"astm-stainless-steel-heavy-hex-structural-bolts-high-strength-large-hex-head-fasteners","status":"publish","type":"product","link":"https:\/\/xzfastener.com\/vi\/products\/astm-stainless-steel-heavy-hex-structural-bolts-high-strength-large-hex-head-fasteners\/","title":{"rendered":"ASTM Stainless Steel Heavy Hex Structural Bolts High Strength Large Hex Head Fasteners"},"content":{"rendered":"

Product Description<\/h2>\n

The ASTM Stainless Steel Heavy Hex Structural Bolt<\/strong> is a high-strength fastening solution designed for structural steel connections, machinery assembly, construction projects, infrastructure, marine engineering, and heavy-duty industrial applications. Made from premium stainless steel<\/strong>, this bolt provides excellent corrosion resistance, stable mechanical performance, and long service life in demanding environments.<\/p>\n

Compared with ordinary hex bolts, heavy hex structural bolts feature a larger hex head bearing surface<\/strong>, which helps distribute load more evenly and provides stronger clamping force in structural connections. The partially threaded design offers improved shear resistance, while the precision-machined threads ensure reliable assembly with matching nuts and washers.<\/p>\n

These bolts can be supplied according to customer requirements, drawings, samples, or applicable ASTM specifications. Common stainless steel material options include 304, 316, A2, A4, ASTM F593, ASTM A193 B8, and ASTM A193 B8M<\/strong>.<\/p>\n

\n

Key Features<\/h2>\n
    \n
  • Heavy hex head design for structural fastening<\/li>\n
  • Made from stainless steel for excellent corrosion resistance<\/li>\n
  • High strength performance for demanding applications<\/li>\n
  • Partial thread design for improved structural connection strength<\/li>\n
  • Suitable for steel structure, machinery, marine, and construction use<\/li>\n
  • Available in multiple ASTM-related material grades<\/li>\n
  • Smooth silver metallic surface with clean appearance<\/li>\n
  • OEM and ODM customization available<\/li>\n<\/ul>\n
    \n

    Product Specifications<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Item<\/th>\nSpecification<\/th>\n<\/tr>\n<\/thead>\n
    Product Name<\/td>\nStainless Steel Heavy Hex Structural Bolt<\/td>\n<\/tr>\n
    Standard<\/td>\nASTM \/ Customized Standard<\/td>\n<\/tr>\n
    Bolt Type<\/td>\nHeavy Hex Structural Bolt<\/td>\n<\/tr>\n
    Head Type<\/td>\nLarge Hex Head \/ Heavy Hex Head<\/td>\n<\/tr>\n
    Material<\/td>\nStainless Steel<\/td>\n<\/tr>\n
    Common Grades<\/td>\n304, 316, A2, A4, ASTM F593, ASTM A193 B8, ASTM A193 B8M<\/td>\n<\/tr>\n
    Surface Finish<\/td>\nPlain Stainless Steel \/ Polished \/ Passivated<\/td>\n<\/tr>\n
    Thread Type<\/td>\nUNC, UNF, Metric Thread Optional<\/td>\n<\/tr>\n
    Thread Design<\/td>\nPartial Thread \/ Full Thread Optional<\/td>\n<\/tr>\n
    Size Range<\/td>\nCustomized Sizes Available<\/td>\n<\/tr>\n
    Application<\/td>\nSteel Structure, Construction, Machinery, Marine, Infrastructure<\/td>\n<\/tr>\n
    Custom Service<\/td>\nOEM \/ ODM Supported<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Material Options<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n\n
    Material Grade<\/th>\nEquivalent \/ Type<\/th>\nMain Feature<\/th>\nTypical Application<\/th>\n<\/tr>\n<\/thead>\n
    Stainless Steel 304<\/td>\nA2<\/td>\nGood corrosion resistance and general strength<\/td>\nConstruction, machinery, general fastening<\/td>\n<\/tr>\n
    Stainless Steel 316<\/td>\nA4<\/td>\nBetter corrosion resistance, especially in humid or marine environments<\/td>\nMarine, chemical, outdoor applications<\/td>\n<\/tr>\n
    ASTM F593<\/td>\nStainless Steel Bolt Standard<\/td>\nCommon ASTM stainless bolt specification<\/td>\nIndustrial and structural fastening<\/td>\n<\/tr>\n
    ASTM A193 B8<\/td>\n304 Stainless Steel Type<\/td>\nHigh-temperature and pressure applications<\/td>\nFlanges, valves, pressure equipment<\/td>\n<\/tr>\n
    ASTM A193 B8M<\/td>\n316 Stainless Steel Type<\/td>\nBetter corrosion resistance than B8<\/td>\nMarine, chemical, high-corrosion areas<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Surface Finish Options<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n\n
    Surface Finish<\/th>\nAppearance<\/th>\nBenefit<\/th>\n<\/tr>\n<\/thead>\n
    Plain Stainless Steel<\/td>\nNatural silver color<\/td>\nClean appearance, good corrosion resistance<\/td>\n<\/tr>\n
    Polished Finish<\/td>\nBright silver surface<\/td>\nBetter appearance and smoother surface<\/td>\n<\/tr>\n
    Passivated Finish<\/td>\nSilver stainless surface<\/td>\nImproves stainless steel corrosion resistance<\/td>\n<\/tr>\n
    Waxed \/ Lubricated<\/td>\nSilver with protective layer<\/td>\nEasier installation and reduced thread galling<\/td>\n<\/tr>\n
    Customized Finish<\/td>\nAccording to request<\/td>\nSuitable for special project requirements<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Product Advantages<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n\n\n
    Advantage<\/th>\nDescription<\/th>\n<\/tr>\n<\/thead>\n
    High Corrosion Resistance<\/td>\nStainless steel provides better rust resistance than carbon steel.<\/td>\n<\/tr>\n
    Heavy Hex Design<\/td>\nLarger head size improves bearing area and load distribution.<\/td>\n<\/tr>\n
    Strong Structural Fastening<\/td>\nSuitable for steel frames, machinery, bridges, and heavy equipment.<\/td>\n<\/tr>\n
    Long Service Life<\/td>\nIdeal for harsh, humid, outdoor, and marine environments.<\/td>\n<\/tr>\n
    Flexible Customization<\/td>\nSize, thread, length, material grade, and packaging can be customized.<\/td>\n<\/tr>\n
    Professional Assembly Support<\/td>\nMatching nuts and washers can be supplied as a complete set.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Common Applications<\/h2>\n

    The ASTM Stainless Steel Heavy Hex Structural Bolt<\/strong> is widely used in applications where both strength and corrosion resistance are required.<\/p>\n

    \n
    \n\n\n\n\n\n\n\n\n\n\n\n
    Industry<\/th>\nTypical Application<\/th>\n<\/tr>\n<\/thead>\n
    Steel Structure<\/td>\nSteel frame connection, beam assembly, structural joints<\/td>\n<\/tr>\n
    Construction<\/td>\nBuilding support systems, metal plates, brackets<\/td>\n<\/tr>\n
    Marine Engineering<\/td>\nDock equipment, ship components, coastal structures<\/td>\n<\/tr>\n
    Machinery<\/td>\nEquipment installation, machine frames, heavy-duty fixing<\/td>\n<\/tr>\n
    Infrastructure<\/td>\nBridges, rail systems, power facilities<\/td>\n<\/tr>\n
    Chemical Industry<\/td>\nCorrosive environment fastening, pressure equipment<\/td>\n<\/tr>\n
    Energy Projects<\/td>\nWind power, solar brackets, pipeline systems<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Why Choose Stainless Steel Heavy Hex Structural Bolts?<\/h2>\n

    Stainless steel heavy hex structural bolts are designed for applications where ordinary fasteners may not provide enough durability or corrosion protection. The large hex head<\/strong> provides a stronger contact area, helping the bolt perform better in heavy-duty structural connections.<\/p>\n

    Unlike carbon steel bolts, stainless steel bolts offer natural corrosion resistance without requiring zinc plating or hot-dip galvanizing. This makes them suitable for long-term use in outdoor, wet, marine, or chemically exposed environments.<\/p>\n

    For projects requiring higher corrosion resistance, 316 stainless steel \/ A4 \/ ASTM A193 B8M<\/strong> is recommended. For general industrial use, 304 stainless steel \/ A2 \/ ASTM A193 B8<\/strong> is commonly selected.<\/p>\n

    \n

    Available Custom Options<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n\n\n\n\n
    Custom Item<\/th>\nAvailable Options<\/th>\n<\/tr>\n<\/thead>\n
    Diameter<\/td>\nM6\u2013M64 \/ 1\/4″\u20132-1\/2″ \/ Custom<\/td>\n<\/tr>\n
    Length<\/td>\nAccording to drawing or sample<\/td>\n<\/tr>\n
    Thread<\/td>\nMetric, UNC, UNF, Coarse Thread, Fine Thread<\/td>\n<\/tr>\n
    Material<\/td>\n304, 316, A2, A4, ASTM F593, ASTM A193 B8\/B8M<\/td>\n<\/tr>\n
    Head Type<\/td>\nHeavy Hex Head, Standard Hex Head, Customized Head<\/td>\n<\/tr>\n
    Thread Length<\/td>\nPartial Thread, Full Thread, Custom Thread Length<\/td>\n<\/tr>\n
    Surface<\/td>\nPlain, Polished, Passivated, Lubricated<\/td>\n<\/tr>\n
    Packaging<\/td>\nBulk Carton, Small Box, Wooden Case, Pallet<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Matching Nuts and Washers<\/h2>\n

    For structural fastening projects, bolts are usually used together with matching nuts and washers to ensure stable performance.<\/p>\n

    \n
    \n\n\n\n\n\n\n\n\n
    Matching Part<\/th>\nAvailable Option<\/th>\n<\/tr>\n<\/thead>\n
    H\u1ea1t<\/td>\nHeavy Hex Nut, Hex Nut, ASTM A194 Nut, Stainless Steel Nut<\/td>\n<\/tr>\n
    M\u00e1y gi\u1eb7t<\/td>\nFlat Washer, Structural Washer, Hardened Washer, Stainless Steel Washer<\/td>\n<\/tr>\n
    Assembly Set<\/td>\nBolt + Nut + Washer Set<\/td>\n<\/tr>\n
    Packaging<\/td>\nIndividual Set Packing \/ Bulk Packing<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Quality Control<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n\n\n\n
    Inspection Item<\/th>\nPurpose<\/th>\n<\/tr>\n<\/thead>\n
    Dimension Inspection<\/td>\nCheck diameter, length, head size, shank, and thread length<\/td>\n<\/tr>\n
    Thread Gauge Test<\/td>\nEnsure accurate thread fit with matching nuts<\/td>\n<\/tr>\n
    Material Test<\/td>\nConfirm stainless steel grade and chemical composition<\/td>\n<\/tr>\n
    Hardness Test<\/td>\nVerify mechanical performance<\/td>\n<\/tr>\n
    Tensile Test<\/td>\nCheck load-bearing capacity<\/td>\n<\/tr>\n
    Surface Inspection<\/td>\nEnsure clean surface without cracks, burrs, or defects<\/td>\n<\/tr>\n
    Packaging Inspection<\/td>\nEnsure safe export packing and correct labels<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    FAQ<\/h2>\n

    1. What is a heavy hex structural bolt?<\/h3>\n

    A heavy hex structural bolt is a bolt with a larger hex head than a standard hex bolt. The larger head provides a bigger bearing surface and is commonly used in structural steel connections and heavy-duty fastening applications.<\/p>\n

    2. What material is this bolt made from?<\/h3>\n

    This product is made from stainless steel. Common options include 304, 316, A2, A4, ASTM F593, ASTM A193 B8, and ASTM A193 B8M.<\/p>\n

    3. Is stainless steel suitable for outdoor use?<\/h3>\n

    Yes. Stainless steel bolts are suitable for outdoor use because they provide good corrosion resistance. For marine or highly corrosive environments, 316 stainless steel or A4 stainless steel is recommended.<\/p>\n

    4. What is the difference between 304 and 316 stainless steel bolts?<\/h3>\n

    304 stainless steel is suitable for general corrosion-resistant applications. 316 stainless steel contains molybdenum, which provides better resistance to salt, moisture, and chemical corrosion.<\/p>\n

    5. Can these bolts be made according to ASTM standards?<\/h3>\n

    Yes. We can manufacture or supply stainless steel bolts according to ASTM-related requirements, such as ASTM F593, ASTM A193 B8, ASTM A193 B8M, or customer-specified drawings and technical requirements.<\/p>\n

    6. Are these bolts fully threaded or partially threaded?<\/h3>\n

    Both options are available. The product image shows partially threaded hex bolts, but full thread bolts can also be customized according to project requirements.<\/p>\n

    7. Can you supply nuts and washers together?<\/h3>\n

    Yes. Matching stainless steel heavy hex nuts, flat washers, structural washers, and complete bolt-nut-washer sets can be supplied.<\/p>\n

    8. Can the size and length be customized?<\/h3>\n

    Yes. Diameter, length, thread pitch, thread length, material grade, surface finish, and packaging can all be customized according to drawings, samples, or purchase specifications.<\/p>\n

    \n

    <\/h2>\n

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    ASTM stainless steel heavy hex structural bolts with high strength performance, large hex head design, and excellent corrosion resistance for steel structures, machinery, construction, marine, and industrial applications.<\/strong><\/p>","protected":false},"featured_media":5730,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"fastener-coating":[95,37,94],"fastener-material":[43],"fastener-type":[53,474],"product_brand":[],"product_cat":[22],"product_tag":[],"class_list":{"0":"post-5727","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"fastener-coating-natural-finish","7":"fastener-coating-original-material","8":"fastener-coating-original-material-natural-finish","9":"fastener-material-stainless-steel","10":"fastener-type-bolts","11":"fastener-type-hex-head-bolt","12":"product_cat-standard-fasteners","14":"first","15":"instock","16":"shipping-taxable","17":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product\/5727","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/comments?post=5727"}],"version-history":[{"count":2,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product\/5727\/revisions"}],"predecessor-version":[{"id":5729,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product\/5727\/revisions\/5729"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/media\/5730"}],"wp:attachment":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/media?parent=5727"}],"wp:term":[{"taxonomy":"fastener-coating","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/fastener-coating?post=5727"},{"taxonomy":"fastener-material","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/fastener-material?post=5727"},{"taxonomy":"fastener-type","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/fastener-type?post=5727"},{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product_brand?post=5727"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product_cat?post=5727"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product_tag?post=5727"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}