{"id":5472,"date":"2026-05-22T22:22:01","date_gmt":"2026-05-22T14:22:01","guid":{"rendered":"https:\/\/xzfastener.com\/?post_type=product&p=5472"},"modified":"2026-06-02T15:10:06","modified_gmt":"2026-06-02T07:10:06","slug":"321-stainless-steel-hex-head-bolts-m8-m10-m12-m16-high-temperature-resistant-metric-hex-bolts-for-chemical-boiler-and-exhaust-systems","status":"publish","type":"product","link":"https:\/\/xzfastener.com\/ru\/products\/321-stainless-steel-hex-head-bolts-m8-m10-m12-m16-high-temperature-resistant-metric-hex-bolts-for-chemical-boiler-and-exhaust-systems\/","title":{"rendered":"321 Stainless Steel Hex Head Bolts M8 M10 M12 M16, High Temperature Resistant Metric Hex Bolts for Chemical, Boiler and Exhaust Systems"},"content":{"rendered":"

Product Description<\/h1>\n

321 Stainless Steel Hex Head Bolts M8 M10 M12 M16<\/h2>\n

Our 321 Stainless Steel Hex Head Bolts<\/strong> are premium metric fasteners designed for high-temperature, corrosion-resistant, and industrial applications. Compared with 304 stainless steel, 321 stainless steel offers better high-temperature stress rupture performance and improved mechanical stability under elevated temperatures<\/strong>.<\/p>\n

These bolts are especially suitable for environments where heat resistance, oxidation resistance, and resistance to intergranular corrosion are required. They are widely used in chemical equipment, petroleum machinery, boilers, heat exchangers, exhaust systems, furnace components, diesel engine mufflers, and other demanding industrial applications.<\/p>\n

Available in common metric sizes such as M8, M10, M12, and M16<\/strong>, these hex head bolts provide reliable fastening performance for high-temperature and corrosive working conditions.<\/p>\n

\n

Key Features<\/h2>\n
    \n
  • Made from 321 stainless steel<\/strong> for excellent high-temperature performance.<\/li>\n
  • Better heat resistance than 304 stainless steel<\/strong> in suitable high-temperature applications.<\/li>\n
  • Good resistance to intergranular corrosion<\/strong> due to titanium-stabilized stainless steel structure.<\/li>\n
  • Hex head design<\/strong> allows easy installation with standard wrench, spanner, or socket tools.<\/li>\n
  • Metric thread sizes<\/strong> available in M8, M10, M12, M16 and other sizes.<\/li>\n
  • Suitable for harsh industrial environments<\/strong>, including chemical, petroleum, boiler, and exhaust systems.<\/li>\n
  • Strong mechanical properties<\/strong> under elevated temperature conditions.<\/li>\n
  • Durable stainless steel finish<\/strong> with good oxidation and corrosion resistance.<\/li>\n<\/ul>\n
    \n

    Product Specifications<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n\n\n\n\n\n
    \u041f\u0440\u0435\u0434\u043c\u0435\u0442<\/th>\n\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435<\/th>\n<\/tr>\n<\/thead>\n
    Product Name<\/td>\n321 Stainless Steel Hex Head Bolt<\/td>\n<\/tr>\n
    \u041c\u0430\u0442\u0435\u0440\u0438\u0430\u043b<\/td>\nStainless Steel 321<\/td>\n<\/tr>\n
    \u0422\u0438\u043f \u0433\u043e\u043b\u043e\u0432\u043a\u0438<\/td>\nHex Head<\/td>\n<\/tr>\n
    \u0422\u0438\u043f \u0440\u0435\u0437\u044c\u0431\u044b<\/td>\nMetric Thread<\/td>\n<\/tr>\n
    Common Sizes<\/td>\nM8, M10, M12, M16<\/td>\n<\/tr>\n
    \u041e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u043f\u043e\u0432\u0435\u0440\u0445\u043d\u043e\u0441\u0442\u0438<\/td>\nPlain Stainless Steel<\/td>\n<\/tr>\n
    \u0421\u0442\u0430\u043d\u0434\u0430\u0440\u0442<\/td>\nMetric \/ Custom Standard Available<\/td>\n<\/tr>\n
    \u041f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0435<\/td>\nHigh-temperature equipment, chemical machinery, boiler systems, exhaust systems<\/td>\n<\/tr>\n
    Customization<\/td>\nSize, length, thread pitch, packaging, drawing-based production<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Size Chart<\/h2>\n

    Unit: mm<\/p>\n

    \n
    \n\n\n\n\n\n\n\n\n
    Size<\/th>\nPitch<\/th>\nWidth Across Flats S<\/th>\nHead Thickness K<\/th>\n<\/tr>\n<\/thead>\n
    \u041c8<\/td>\n1.25<\/td>\n13<\/td>\n5.3<\/td>\n<\/tr>\n
    \u041c10<\/td>\n1.5<\/td>\n16<\/td>\n6.8<\/td>\n<\/tr>\n
    \u041c12<\/td>\n1.75<\/td>\n18<\/td>\n7.5<\/td>\n<\/tr>\n
    \u041c16<\/td>\n2.0<\/td>\n24<\/td>\n10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

    Additional sizes such as M4, M5, M6, M14, M18, M20, M22, M24, M27, M30, M33, and M36<\/strong> can also be supplied according to customer requirements.<\/p>\n

    \n

    Why Choose 321 Stainless Steel?<\/h2>\n

    321 stainless steel is a titanium-stabilized stainless steel. It is commonly used in applications where parts must maintain good mechanical properties under high-temperature conditions.<\/p>\n

    \n
    \n\n\n\n\n\n\n\n
    \u041c\u0430\u0442\u0435\u0440\u0438\u0430\u043b<\/th>\nMain Feature<\/th>\nRecommended Use<\/th>\n<\/tr>\n<\/thead>\n
    304 Stainless Steel<\/td>\nGood general corrosion resistance<\/td>\nGeneral machinery, indoor and outdoor use<\/td>\n<\/tr>\n
    316 Stainless Steel<\/td>\nBetter corrosion resistance, especially in marine environments<\/td>\nMarine, coastal, chemical, humid environments<\/td>\n<\/tr>\n
    321 Stainless Steel<\/td>\nBetter high-temperature stability and resistance to intergranular corrosion<\/td>\nHeat exchangers, boilers, exhaust pipes, furnace parts<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

    For applications involving heat, exhaust gas, chemical equipment, or thermal cycling, 321 stainless steel bolts<\/strong> are a reliable choice.<\/p>\n

    \n

    Common Industry Applications<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Industry \/ Equipment<\/th>\nTypical Use<\/th>\n<\/tr>\n<\/thead>\n
    Chemical Industry<\/td>\nEquipment exposed to corrosive and high-temperature environments<\/td>\n<\/tr>\n
    Coal Industry<\/td>\nOpen-air machinery and heat-resistant assemblies<\/td>\n<\/tr>\n
    Petroleum Industry<\/td>\nOil and gas equipment, pipelines, combustion systems<\/td>\n<\/tr>\n
    Boiler Systems<\/td>\nBoiler housing, pressure vessels, and heating components<\/td>\n<\/tr>\n
    Heat Exchangers<\/td>\nHigh-temperature fastening and structural connection<\/td>\n<\/tr>\n
    Engine Exhaust Systems<\/td>\nExhaust pipes and muffler components<\/td>\n<\/tr>\n
    Furnace Equipment<\/td>\nHeating furnace components and spiral welded tube assemblies<\/td>\n<\/tr>\n
    Diesel Engines<\/td>\nMuffler parts and exhaust-related components<\/td>\n<\/tr>\n
    Building Materials Industry<\/td>\nHeat-resistant equipment parts<\/td>\n<\/tr>\n
    Expansion Joints<\/td>\nHigh-temperature pipeline connection systems<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Typical Application Examples<\/h2>\n

    These 321 stainless steel hex head bolts<\/strong> are commonly used in:<\/p>\n

    \n
    \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    No.<\/th>\n\u041f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0435<\/th>\n<\/tr>\n<\/thead>\n
    1<\/td>\nOil exhaust gas combustion pipelines<\/td>\n<\/tr>\n
    2<\/td>\nEngine exhaust pipes<\/td>\n<\/tr>\n
    3<\/td>\nBoiler housings<\/td>\n<\/tr>\n
    4<\/td>\nHeat exchangers<\/td>\n<\/tr>\n
    5<\/td>\nHeating furnace components<\/td>\n<\/tr>\n
    6<\/td>\nMuffler parts for diesel engines<\/td>\n<\/tr>\n
    7<\/td>\nBoiler pressure vessels<\/td>\n<\/tr>\n
    8<\/td>\nChemical trucks<\/td>\n<\/tr>\n
    9<\/td>\nExpansion joints<\/td>\n<\/tr>\n
    10<\/td>\nSpiral welded tubes for furnace pipes and dryers<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Product Advantages<\/h2>\n

    The 321 Stainless Steel Hex Head Bolt<\/strong> is designed for demanding industrial environments where ordinary stainless steel fasteners may not provide enough high-temperature stability.<\/p>\n

    The hex head structure offers excellent torque transmission and easy installation. The stainless steel body provides corrosion resistance, while the 321 grade material helps improve performance in heat-resistant applications.<\/p>\n

    These bolts are suitable for manufacturers, maintenance teams, engineering contractors, and industrial equipment suppliers who need reliable fasteners for high-temperature and corrosion-resistant working conditions.<\/p>\n

    \n

    Installation Notes<\/h2>\n

    Before placing an order, please confirm the following details:<\/p>\n

    \n
    \n\n\n\n\n\n\n\n\n\n\n\n
    Required Information<\/th>\nExample<\/th>\n<\/tr>\n<\/thead>\n
    Bolt Size<\/td>\nM8, M10, M12, M16<\/td>\n<\/tr>\n
    Length<\/td>\n20mm, 30mm, 50mm, 80mm, customized<\/td>\n<\/tr>\n
    \u0422\u0438\u043f \u0440\u0435\u0437\u044c\u0431\u044b<\/td>\nFull thread or partial thread<\/td>\n<\/tr>\n
    \u041c\u0430\u0442\u0435\u0440\u0438\u0430\u043b<\/td>\n321 stainless steel<\/td>\n<\/tr>\n
    \u0421\u0442\u0430\u043d\u0434\u0430\u0440\u0442<\/td>\nDIN, ISO, GB, ANSI, or custom drawing<\/td>\n<\/tr>\n
    Quantity<\/td>\nSmall quantity or bulk order<\/td>\n<\/tr>\n
    Application Environment<\/td>\nHigh temperature, chemical, outdoor, boiler, exhaust system<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

    For high-temperature or pressure-related equipment, please confirm the working temperature, load requirement, and applicable industry standard before use.<\/p>\n

    \n

    \u0421\u043e\u0432\u043f\u0430\u0434\u0435\u043d\u0438\u0435 \u0442\u043e\u0432\u0430\u0440\u043e\u0432<\/h2>\n

    For better assembly performance, these bolts can be supplied together with:<\/p>\n

    \n
    \n\n\n\n\n\n\n\n\n
    Product<\/th>\nFunction<\/th>\n<\/tr>\n<\/thead>\n
    321 Stainless Steel Hex Nuts<\/td>\nMatching threaded fastening<\/td>\n<\/tr>\n
    321 Stainless Steel Flat Washers<\/td>\nLoad distribution and surface protection<\/td>\n<\/tr>\n
    321 Stainless Steel Spring Washers<\/td>\nAnti-loosening support<\/td>\n<\/tr>\n
    Stainless Steel Custom Fasteners<\/td>\nSpecial industrial assembly requirements<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    \u0427\u0430\u0441\u0442\u043e \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u0432\u043e\u043f\u0440\u043e\u0441\u044b<\/h2>\n

    Q1: What is 321 stainless steel?<\/h3>\n

    321 stainless steel is a titanium-stabilized stainless steel with good high-temperature performance and resistance to intergranular corrosion. It is commonly used in heat-resistant industrial applications.<\/p>\n

    Q2: What is the difference between 321 and 304 stainless steel bolts?<\/h3>\n

    304 stainless steel is suitable for general corrosion-resistant applications. 321 stainless steel has better high-temperature stability and is more suitable for boilers, exhaust systems, heat exchangers, furnace parts, and chemical equipment.<\/p>\n

    Q3: What sizes are available?<\/h3>\n

    Common sizes include M8, M10, M12, and M16<\/strong>. Other metric sizes from M4 to M36<\/strong> can also be supplied according to customer requirements.<\/p>\n

    Q4: Are these bolts suitable for high-temperature applications?<\/h3>\n

    Yes. 321 stainless steel is commonly used for high-temperature equipment and heat-resistant parts. It performs better than 304 stainless steel in many elevated-temperature environments.<\/p>\n

    Q5: Can these bolts be used in chemical equipment?<\/h3>\n

    Yes. These bolts are suitable for chemical machinery and equipment requiring corrosion resistance and heat resistance.<\/p>\n

    Q6: Are these bolts fully threaded or partially threaded?<\/h3>\n

    Both fully threaded and partially threaded versions can be supplied depending on the size, length, and customer requirements.<\/p>\n

    Q7: Can you customize the length?<\/h3>\n

    Yes. Bolt length can be customized according to drawings, samples, or specific project requirements.<\/p>\n

    Q8: What tools are used to install these bolts?<\/h3>\n

    They can be installed with standard wrenches, spanners, or socket tools matching the hex head size.<\/p>\n

    Q9: Can these bolts be used with 304 or 316 stainless steel nuts?<\/h3>\n

    They can be assembled if the thread size and pitch match. However, for high-temperature or special industrial environments, using matching 321 stainless steel nuts and washers<\/strong> is recommended.<\/p>\n

    Q10: Do you support bulk orders?<\/h3>\n

    Yes. Bulk orders, OEM packaging, customized specifications, and drawing-based production are available.<\/p>\n

    \n

    Short Product Summary<\/h2>\n

    321 Stainless Steel Hex Head Bolts M8 M10 M12 M16<\/strong> are high-temperature resistant metric fasteners designed for chemical, petroleum, boiler, heat exchanger, exhaust system, furnace, and industrial equipment applications. Compared with 304 stainless steel, 321 stainless steel provides better high-temperature mechanical performance and improved resistance to intergranular corrosion, making it suitable for demanding heat-resistant fastening applications.<\/p>","protected":false},"excerpt":{"rendered":"

    Product Description 321 Stainless Steel Hex Head Bolts M8 M10 M12 M16 Our 321 Stainless Steel Hex Head Bolts are premium metric fasteners designed for high-temperature, corrosion-resistant, and industrial applications. Compared with 304 stainless steel, 321 stainless steel offers better high-temperature stress rupture performance and improved mechanical stability under elevated temperatures. These bolts are especially […]<\/p>\n","protected":false},"featured_media":5474,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"fastener-coating":[37,150,95,94],"fastener-material":[43],"fastener-type":[53,474],"product_brand":[],"product_cat":[22],"product_tag":[],"class_list":{"0":"post-5472","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"fastener-coating-original-material","7":"fastener-coating-custom-color-coating","8":"fastener-coating-natural-finish","9":"fastener-coating-original-material-natural-finish","10":"fastener-material-stainless-steel","11":"fastener-type-bolts","12":"fastener-type-hex-head-bolt","13":"product_cat-standard-fasteners","15":"first","16":"instock","17":"shipping-taxable","18":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/xzfastener.com\/ru\/wp-json\/wp\/v2\/product\/5472","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xzfastener.com\/ru\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/xzfastener.com\/ru\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/ru\/wp-json\/wp\/v2\/comments?post=5472"}],"version-history":[{"count":1,"href":"https:\/\/xzfastener.com\/ru\/wp-json\/wp\/v2\/product\/5472\/revisions"}],"predecessor-version":[{"id":5473,"href":"https:\/\/xzfastener.com\/ru\/wp-json\/wp\/v2\/product\/5472\/revisions\/5473"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/ru\/wp-json\/wp\/v2\/media\/5474"}],"wp:attachment":[{"href":"https:\/\/xzfastener.com\/ru\/wp-json\/wp\/v2\/media?parent=5472"}],"wp:term":[{"taxonomy":"fastener-coating","embeddable":true,"href":"https:\/\/xzfastener.com\/ru\/wp-json\/wp\/v2\/fastener-coating?post=5472"},{"taxonomy":"fastener-material","embeddable":true,"href":"https:\/\/xzfastener.com\/ru\/wp-json\/wp\/v2\/fastener-material?post=5472"},{"taxonomy":"fastener-type","embeddable":true,"href":"https:\/\/xzfastener.com\/ru\/wp-json\/wp\/v2\/fastener-type?post=5472"},{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/xzfastener.com\/ru\/wp-json\/wp\/v2\/product_brand?post=5472"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/xzfastener.com\/ru\/wp-json\/wp\/v2\/product_cat?post=5472"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/xzfastener.com\/ru\/wp-json\/wp\/v2\/product_tag?post=5472"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}