{"id":5481,"date":"2026-05-12T15:03:06","date_gmt":"2026-05-12T07:03:06","guid":{"rendered":"https:\/\/xzfastener.com\/?post_type=product&p=5481"},"modified":"2026-05-12T15:03:07","modified_gmt":"2026-05-12T07:03:07","slug":"stainless-steel-square-head-bolts-m4-m5-m6-m8-m10-m12-a2-70-metric-fully-threaded-square-head-screws","status":"publish","type":"product","link":"https:\/\/xzfastener.com\/vi\/products\/stainless-steel-square-head-bolts-m4-m5-m6-m8-m10-m12-a2-70-metric-fully-threaded-square-head-screws\/","title":{"rendered":"Stainless Steel Square Head Bolts M4 M5 M6 M8 M10 M12, A2-70 Metric Fully Threaded Square Head Screws"},"content":{"rendered":"

Product Description<\/h1>\n

Stainless Steel Square Head Bolts<\/h2>\n

Our Stainless Steel Square Head Bolts<\/strong> are durable metric fasteners designed for machinery, equipment assembly, industrial maintenance, construction, and custom fastening applications. Compared with standard hex head bolts, square head bolts provide a larger gripping surface and are commonly used where better wrench engagement, anti-rotation performance, or traditional fastening style is required.<\/p>\n

These bolts are made from stainless steel, commonly available in A2-70 \/ 304 stainless steel<\/strong>, offering good corrosion resistance, clean appearance, and reliable mechanical performance. The full threaded design provides strong engagement with matching nuts or threaded holes.<\/p>\n

Available in common metric sizes including M4, M5, M6, M8, M10, and M12<\/strong>, these square head bolts are suitable for both standard and customized fastening requirements.<\/p>\n

\n

Key Features<\/h2>\n
    \n
  • Square head design<\/strong> for strong tool grip and stable tightening.<\/li>\n
  • Stainless steel material<\/strong> with good corrosion and rust resistance.<\/li>\n
  • A2-70 grade available<\/strong>, suitable for general industrial fastening.<\/li>\n
  • Fully threaded body<\/strong> for maximum thread engagement.<\/li>\n
  • Metric thread sizes<\/strong> from M4 to M12.<\/li>\n
  • Good anti-rotation performance<\/strong> in slots, channels, and square recesses.<\/li>\n
  • Suitable for machinery, equipment, construction, furniture, and repair work.<\/strong><\/li>\n
  • Custom length and packaging available<\/strong> according to customer requirements.<\/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
    Item<\/th>\nDescription<\/th>\n<\/tr>\n<\/thead>\n
    Product Name<\/td>\nStainless Steel Square Head Bolt<\/td>\n<\/tr>\n
    Material<\/td>\nStainless Steel<\/td>\n<\/tr>\n
    Common Grade<\/td>\nA2-70 \/ 304 Stainless Steel<\/td>\n<\/tr>\n
    Head Type<\/td>\nSquare Head<\/td>\n<\/tr>\n
    Thread Type<\/td>\nMetric Thread<\/td>\n<\/tr>\n
    Threading<\/td>\nFully Threaded<\/td>\n<\/tr>\n
    Available Sizes<\/td>\nM4, M5, M6, M8, M10, M12<\/td>\n<\/tr>\n
    Surface Finish<\/td>\nPlain Stainless Steel<\/td>\n<\/tr>\n
    Drive Type<\/td>\nExternal Square Head<\/td>\n<\/tr>\n
    Application<\/td>\nMachinery, equipment, construction, industrial fastening, repair<\/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\n\n
    Thread Size<\/th>\nPitch<\/th>\nHead Thickness K<\/th>\nSquare Head Width S<\/th>\n<\/tr>\n<\/thead>\n
    M4<\/td>\n0.7<\/td>\n2.7\u20133.24<\/td>\n6.64\u20137<\/td>\n<\/tr>\n
    M5<\/td>\n0.8<\/td>\n3.26\u20133.74<\/td>\n7.64\u20138<\/td>\n<\/tr>\n
    M6<\/td>\n1.0<\/td>\n3.76\u20134.24<\/td>\n9.64\u201310<\/td>\n<\/tr>\n
    M8<\/td>\n1.25<\/td>\n4.76\u20135.24<\/td>\n12.57\u201313<\/td>\n<\/tr>\n
    M10<\/td>\n1.5<\/td>\n5.76\u20136.24<\/td>\n15.57\u201317<\/td>\n<\/tr>\n
    M12<\/td>\n1.75<\/td>\n6.71\u20137.29<\/td>\n17.57\u201319<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    What Are Square Head Bolts?<\/h2>\n

    Square head bolts<\/strong> are bolts with a four-sided head instead of a hexagonal head. The square head provides a large contact area for tools and can also help prevent rotation when installed in a matching square slot or channel.<\/p>\n

    They are commonly used in:<\/p>\n

    \n
    \n\n\n\n\n\n\n\n\n\n\n
    Application<\/th>\nFunction<\/th>\n<\/tr>\n<\/thead>\n
    Machinery Assembly<\/td>\nSecure fastening and positioning<\/td>\n<\/tr>\n
    Industrial Equipment<\/td>\nDurable connection in maintenance work<\/td>\n<\/tr>\n
    Construction Projects<\/td>\nStructural and bracket fastening<\/td>\n<\/tr>\n
    Wood and Metal Work<\/td>\nTraditional square head fastening<\/td>\n<\/tr>\n
    T-slot or Channel Systems<\/td>\nHelps reduce bolt rotation<\/td>\n<\/tr>\n
    Repair and Replacement<\/td>\nSuitable for non-standard or older equipment<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Material Advantages<\/h2>\n

    Stainless steel square head bolts are suitable for applications where corrosion resistance and clean appearance are important.<\/p>\n

    \n
    \n\n\n\n\n\n\n\n
    Material Grade<\/th>\nFeature<\/th>\nRecommended Use<\/th>\n<\/tr>\n<\/thead>\n
    A2 \/ 304 Stainless Steel<\/td>\nGood corrosion resistance and general strength<\/td>\nIndoor, outdoor, machinery, equipment, furniture<\/td>\n<\/tr>\n
    A4 \/ 316 Stainless Steel<\/td>\nBetter corrosion resistance in harsh environments<\/td>\nMarine, coastal, chemical, humid environments<\/td>\n<\/tr>\n
    Carbon Steel<\/td>\nHigher strength options, lower cost<\/td>\nDry indoor use or coated fasteners<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

    For most general-purpose applications, A2-70 \/ 304 stainless steel square head bolts<\/strong> provide a good balance of corrosion resistance, durability, and cost performance.<\/p>\n

    \n

    Common Applications<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n\n\n\n\n
    Industry<\/th>\nTypical Use<\/th>\n<\/tr>\n<\/thead>\n
    S\u1ea3n xu\u1ea5t m\u00e1y m\u00f3c<\/td>\nEquipment assembly and fastening<\/td>\n<\/tr>\n
    Industrial Maintenance<\/td>\nReplacement bolts for machines and fixtures<\/td>\n<\/tr>\n
    Construction<\/td>\nSteel structure, brackets, supports<\/td>\n<\/tr>\n
    Furniture Production<\/td>\nWood and metal furniture connections<\/td>\n<\/tr>\n
    Automotive Repair<\/td>\nCustom mounting and repair applications<\/td>\n<\/tr>\n
    Agricultural Equipment<\/td>\nGeneral fastening and maintenance<\/td>\n<\/tr>\n
    DIY Projects<\/td>\nHome repair and custom fabrication<\/td>\n<\/tr>\n
    Marine & Outdoor Use<\/td>\nStainless steel corrosion-resistant fastening<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Product Advantages<\/h2>\n

    These Stainless Steel Square Head Bolts<\/strong> are designed for secure and durable fastening. The square head makes the bolt easy to grip with tools and can help prevent spinning during installation in suitable applications.<\/p>\n

    The stainless steel material provides good resistance to rust and corrosion, making these bolts suitable for indoor, outdoor, and general industrial environments. With full metric threading, they can be used with matching metric nuts, washers, or threaded holes.<\/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
    Required Information<\/th>\nExample<\/th>\n<\/tr>\n<\/thead>\n
    Size<\/td>\nM4, M5, M6, M8, M10, M12<\/td>\n<\/tr>\n
    Length<\/td>\n10mm, 20mm, 30mm, 50mm, customized<\/td>\n<\/tr>\n
    Material<\/td>\nA2 \/ 304 stainless steel, A4 \/ 316 stainless steel<\/td>\n<\/tr>\n
    Thread Type<\/td>\nFull thread or partial thread<\/td>\n<\/tr>\n
    Quantity<\/td>\nSmall pack or bulk order<\/td>\n<\/tr>\n
    Matching Accessories<\/td>\nNuts, flat washers, spring washers<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

    Please use matching metric nuts and washers<\/strong> for correct assembly. If the bolt will be used in marine or chemical environments, 316 stainless steel<\/strong> is recommended.<\/p>\n

    \n

    Matching Products<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n\n
    Matching Product<\/th>\nFunction<\/th>\n<\/tr>\n<\/thead>\n
    Stainless Steel Square Nuts<\/td>\nTraditional matching fastening<\/td>\n<\/tr>\n
    Stainless Steel Hex Nuts<\/td>\nGeneral fastening connection<\/td>\n<\/tr>\n
    Flat Washers<\/td>\nLoad distribution and surface protection<\/td>\n<\/tr>\n
    Spring Washers<\/td>\nAnti-loosening support<\/td>\n<\/tr>\n
    Custom Fasteners<\/td>\nFor special machinery or drawing-based production<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    FAQ<\/h2>\n

    Q1: What is a square head bolt?<\/h3>\n

    A square head bolt is a bolt with a four-sided square head. It provides strong tool grip and can help prevent rotation when used in square slots or special fixtures.<\/p>\n

    Q2: What material are these bolts made from?<\/h3>\n

    They are made from stainless steel. Common material options include A2-70 \/ 304 stainless steel<\/strong> and A4 \/ 316 stainless steel<\/strong>.<\/p>\n

    Q3: What does A2-70 mean?<\/h3>\n

    A2<\/strong> usually refers to 304 stainless steel, and 70<\/strong> refers to the strength class. A2-70 stainless steel fasteners are widely used for general corrosion-resistant applications.<\/p>\n

    Q4: What sizes are available?<\/h3>\n

    Common sizes include M4, M5, M6, M8, M10, and M12<\/strong>. Other sizes can be customized according to drawings or samples.<\/p>\n

    Q5: Are these bolts fully threaded?<\/h3>\n

    Yes, the product shown is a fully threaded square head bolt<\/strong>. Partial thread versions can also be customized if required.<\/p>\n

    Q6: Can these bolts be used outdoors?<\/h3>\n

    Yes. Stainless steel square head bolts can be used outdoors. For normal outdoor use, 304 stainless steel is suitable. For marine or highly corrosive environments, 316 stainless steel is recommended.<\/p>\n

    Q7: What tools are used to install square head bolts?<\/h3>\n

    They can be installed with an adjustable wrench, open-end wrench, spanner, or custom fixture that fits the square head.<\/p>\n

    Q8: Can you supply matching nuts and washers?<\/h3>\n

    Yes. Matching stainless steel nuts, flat washers, spring washers, and custom fastener sets can be supplied.<\/p>\n

    Q9: Can the length be customized?<\/h3>\n

    Yes. Length, material, thread type, surface finish, and packaging can be customized according to customer requirements.<\/p>\n

    Q10: What are square head bolts mainly used for?<\/h3>\n

    They are commonly used in machinery, construction, industrial equipment, furniture assembly, agricultural machinery, repair work, and custom fastening projects.<\/p>\n

    \n

    Short Product Summary<\/h2>\n

    Stainless Steel Square Head Bolts M4 M5 M6 M8 M10 M12<\/strong> are corrosion-resistant metric fasteners with a four-sided square head and fully threaded body. Made from stainless steel, commonly A2-70 \/ 304 stainless steel<\/strong>, they are suitable for machinery, construction, industrial equipment, furniture, repair work, and custom fastening applications. Matching nuts, washers, customized sizes, and bulk packaging are available.<\/p>","protected":false},"excerpt":{"rendered":"

    Product Description Stainless Steel Square Head Bolts Our Stainless Steel Square Head Bolts are durable metric fasteners designed for machinery, equipment assembly, industrial maintenance, construction, and custom fastening applications. Compared with standard hex head bolts, square head bolts provide a larger gripping surface and are commonly used where better wrench engagement, anti-rotation performance, or traditional […]<\/p>\n","protected":false},"featured_media":5482,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"fastener-coating":[37,95,94],"fastener-material":[43],"fastener-type":[53,476],"product_brand":[],"product_cat":[22,28],"product_tag":[],"class_list":{"0":"post-5481","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"fastener-coating-original-material","7":"fastener-coating-natural-finish","8":"fastener-coating-original-material-natural-finish","9":"fastener-material-stainless-steel","10":"fastener-type-bolts","11":"fastener-type-square-head","12":"product_cat-standard-fasteners","13":"product_cat-custom-non-standard-fasteners","15":"first","16":"instock","17":"shipping-taxable","18":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product\/5481","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=5481"}],"version-history":[{"count":1,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product\/5481\/revisions"}],"predecessor-version":[{"id":5487,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product\/5481\/revisions\/5487"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/media\/5482"}],"wp:attachment":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/media?parent=5481"}],"wp:term":[{"taxonomy":"fastener-coating","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/fastener-coating?post=5481"},{"taxonomy":"fastener-material","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/fastener-material?post=5481"},{"taxonomy":"fastener-type","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/fastener-type?post=5481"},{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product_brand?post=5481"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product_cat?post=5481"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product_tag?post=5481"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}