{"id":5488,"date":"2026-05-12T15:10:54","date_gmt":"2026-05-12T07:10:54","guid":{"rendered":"https:\/\/xzfastener.com\/?post_type=product&p=5488"},"modified":"2026-05-12T15:11:15","modified_gmt":"2026-05-12T07:11:15","slug":"stainless-steel-countersunk-square-neck-bolts-m6-flat-head-anti-rotation-carriage-bolts-for-machinery-and-wood-assembly","status":"publish","type":"product","link":"https:\/\/xzfastener.com\/vi\/products\/stainless-steel-countersunk-square-neck-bolts-m6-flat-head-anti-rotation-carriage-bolts-for-machinery-and-wood-assembly\/","title":{"rendered":"Stainless Steel Countersunk Square Neck Bolts M6, Flat Head Anti-Rotation Carriage Bolts for Machinery and Wood Assembly"},"content":{"rendered":"

Product Description<\/h1>\n

Stainless Steel Countersunk Square Neck Bolts<\/h2>\n

Our Stainless Steel Countersunk Square Neck Bolts<\/strong> are specially designed fasteners with a flat countersunk head and a square neck under the head. The countersunk head allows the bolt to sit flush with the surface after installation, while the square neck helps prevent the bolt from rotating during tightening.<\/p>\n

These bolts are ideal for applications where a smooth surface, strong fastening, and anti-rotation performance are required. They are commonly used in machinery, wood structures, metal assemblies, furniture, agricultural equipment, construction, and custom fastening projects.<\/p>\n

Made from stainless steel, these bolts provide good corrosion resistance, durability, and a clean appearance, making them suitable for indoor, outdoor, and general industrial use.<\/p>\n

\n

Key Features<\/h2>\n
    \n
  • Countersunk flat head design<\/strong> for flush surface installation.<\/li>\n
  • Square neck under the head<\/strong> helps prevent rotation during tightening.<\/li>\n
  • Stainless steel material<\/strong> provides good corrosion and rust resistance.<\/li>\n
  • Metric thread design<\/strong>, commonly available in M6 and custom sizes.<\/li>\n
  • Suitable for wood, metal, machinery, furniture, and equipment assembly.<\/strong><\/li>\n
  • Clean surface appearance<\/strong> after installation.<\/li>\n
  • Strong fastening performance<\/strong> with matching nuts and washers.<\/li>\n
  • Custom length, material, and size 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 Countersunk Square Neck Bolt<\/td>\n<\/tr>\n
    Head Type<\/td>\nCountersunk Flat Head<\/td>\n<\/tr>\n
    Neck Type<\/td>\nSquare Neck<\/td>\n<\/tr>\n
    Material<\/td>\nStainless Steel<\/td>\n<\/tr>\n
    Common Material Options<\/td>\n304 Stainless Steel \/ 316 Stainless Steel<\/td>\n<\/tr>\n
    Thread Type<\/td>\nMetric Thread<\/td>\n<\/tr>\n
    Common Size<\/td>\nM6<\/td>\n<\/tr>\n
    Drive Type<\/td>\nNo Drive \/ Anti-Rotation Square Neck<\/td>\n<\/tr>\n
    Surface Finish<\/td>\nPlain Stainless Steel<\/td>\n<\/tr>\n
    Application<\/td>\nMachinery, wood assembly, furniture, construction, metal fixing<\/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
    Thread Size<\/th>\nPitch P<\/th>\nHead Diameter dk<\/th>\nHead Thickness k<\/th>\nSquare Neck Width s<\/th>\n<\/tr>\n<\/thead>\n
    M6<\/td>\n1.0<\/td>\n13.3\u201315.1<\/td>\n2.7\u20133.48<\/td>\n5.84\u20136.36<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Drawing Parameter Explanation<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n\n\n\n\n
    Symbol<\/th>\nMeaning<\/th>\n<\/tr>\n<\/thead>\n
    d<\/td>\nThread diameter<\/td>\n<\/tr>\n
    P<\/td>\nThread pitch<\/td>\n<\/tr>\n
    L<\/td>\nTotal bolt length<\/td>\n<\/tr>\n
    b<\/td>\nThread length<\/td>\n<\/tr>\n
    dk<\/td>\nCountersunk head diameter<\/td>\n<\/tr>\n
    k<\/td>\nHead thickness<\/td>\n<\/tr>\n
    s<\/td>\nSquare neck width<\/td>\n<\/tr>\n
    ds<\/td>\nNeck or shank diameter<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    What Is a Countersunk Square Neck Bolt?<\/h2>\n

    A countersunk square neck bolt<\/strong> is a special bolt with two important design features:<\/p>\n

    \n
    \n\n\n\n\n\n\n
    Feature<\/th>\nFunction<\/th>\n<\/tr>\n<\/thead>\n
    Countersunk Head<\/td>\nAllows the bolt head to sit flush with the surface<\/td>\n<\/tr>\n
    Square Neck<\/td>\nPrevents the bolt from spinning during installation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

    When the bolt is inserted into a pre-drilled hole or square recess, the square neck locks into the material. This makes installation easier because the bolt does not rotate when the nut is tightened from the other side.<\/p>\n

    \n

    Common Applications<\/h2>\n
    \n
    \n\n\n\n\n\n\n\n\n\n\n\n\n
    Application Area<\/th>\nTypical Use<\/th>\n<\/tr>\n<\/thead>\n
    Wood Assembly<\/td>\nTimber structures, wooden frames, furniture<\/td>\n<\/tr>\n
    Metal Fabrication<\/td>\nBrackets, plates, and equipment fixing<\/td>\n<\/tr>\n
    Machinery Assembly<\/td>\nAnti-rotation fastening in equipment<\/td>\n<\/tr>\n
    Construction<\/td>\nFlush surface fastening and structural connection<\/td>\n<\/tr>\n
    Furniture Manufacturing<\/td>\nClean surface appearance and stable fixing<\/td>\n<\/tr>\n
    Agricultural Equipment<\/td>\nRepair and replacement fastening<\/td>\n<\/tr>\n
    Industrial Maintenance<\/td>\nCustom machinery and equipment repair<\/td>\n<\/tr>\n
    DIY Projects<\/td>\nHome repair, workshop, and custom assembly<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Material Advantages<\/h2>\n

    Stainless steel countersunk square neck bolts are suitable for applications requiring corrosion resistance and a clean finish.<\/p>\n

    \n
    \n\n\n\n\n\n\n\n
    Material<\/th>\nFeature<\/th>\nRecommended Use<\/th>\n<\/tr>\n<\/thead>\n
    304 Stainless Steel<\/td>\nGood corrosion resistance and cost performance<\/td>\nGeneral indoor, outdoor, machinery, furniture<\/td>\n<\/tr>\n
    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 or coated applications<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

    For general use, 304 stainless steel<\/strong> is a practical choice. For marine or highly corrosive environments, 316 stainless steel<\/strong> is recommended.<\/p>\n

    \n

    Product Advantages<\/h2>\n

    These Stainless Steel Countersunk Square Neck Bolts<\/strong> provide both functional fastening and a clean finished appearance. The flat head helps reduce surface protrusion, while the square neck improves anti-rotation performance during installation.<\/p>\n

    They are especially useful when the bolt head side is difficult to hold with a tool or when the surface needs to remain smooth after assembly. With stainless steel material, they offer reliable durability and corrosion resistance for many different industries.<\/p>\n

    \n

    Installation Notes<\/h2>\n

    Before ordering, please confirm the following details:<\/p>\n

    \n
    \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>\nM6<\/td>\n<\/tr>\n
    Length<\/td>\nCustomized according to project requirement<\/td>\n<\/tr>\n
    Material<\/td>\n304 stainless steel or 316 stainless steel<\/td>\n<\/tr>\n
    Thread Pitch<\/td>\nM6 \u00d7 1.0<\/td>\n<\/tr>\n
    Head Type<\/td>\nCountersunk flat head<\/td>\n<\/tr>\n
    Neck Type<\/td>\nSquare neck<\/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

    For correct installation, the square neck should match the hole or recess design. This helps prevent rotation and improves fastening stability.<\/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 Hex Nuts<\/td>\nUsed to tighten and secure the bolt<\/td>\n<\/tr>\n
    Stainless Steel Flat Washers<\/td>\nDistributes load and protects the surface<\/td>\n<\/tr>\n
    Stainless Steel Spring Washers<\/td>\nHelps improve anti-loosening performance<\/td>\n<\/tr>\n
    Stainless Steel Lock Nuts<\/td>\nProvides stronger anti-loosening effect<\/td>\n<\/tr>\n
    Custom Fasteners<\/td>\nAvailable for special drawings or samples<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    FAQ<\/h2>\n

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

    A countersunk square neck bolt is a bolt with a flat countersunk head and a square neck under the head. The head sits flush with the surface, and the square neck helps prevent rotation.<\/p>\n

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

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

    Q3: What size is available?<\/h3>\n

    The size shown is M6<\/strong>, with a standard pitch of 1.0 mm<\/strong>. Other sizes can be customized according to drawings or samples.<\/p>\n

    Q4: What is the function of the square neck?<\/h3>\n

    The square neck locks into the material or hole and prevents the bolt from spinning when the nut is tightened.<\/p>\n

    Q5: What is the function of the countersunk head?<\/h3>\n

    The countersunk head allows the bolt head to sit flat or nearly flush with the surface, creating a smooth and clean appearance.<\/p>\n

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

    Yes. They are suitable for wood assembly, timber structures, furniture, and other wood-to-metal or wood-to-wood fastening applications.<\/p>\n

    Q7: Can these bolts be used outdoors?<\/h3>\n

    Yes. Stainless steel provides good corrosion resistance and can be used outdoors. For marine or highly corrosive environments, 316 stainless steel is recommended.<\/p>\n

    Q8: Do these bolts need matching nuts?<\/h3>\n

    Yes. These bolts are usually used with matching metric nuts. Flat washers, spring washers, or lock nuts can also be used depending on the application.<\/p>\n

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

    Yes. Length, material, head size, thread length, and packaging can be customized according to customer requirements.<\/p>\n

    Q10: Are these bolts the same as carriage bolts?<\/h3>\n

    They are similar to carriage bolts because both have an anti-rotation neck design. However, this product uses a countersunk flat head<\/strong>, while common carriage bolts usually have a round head.<\/p>\n

    \n

    ","protected":false},"excerpt":{"rendered":"

    Short Product Summary<\/h2>\n

    Stainless Steel Countersunk Square Neck Bolts<\/strong> are metric anti-rotation fasteners with a flat countersunk head and square neck design. The countersunk head provides flush installation, while the square neck prevents spinning during tightening. These bolts are suitable for machinery, wood assembly, furniture, construction, metal fabrication, agricultural equipment, and custom industrial fastening applications. Matching nuts, washers, customized lengths, and stainless steel material options are available.<\/p>","protected":false},"featured_media":5489,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"fastener-coating":[95,150,37,94],"fastener-material":[43],"fastener-type":[53,476],"product_brand":[],"product_cat":[22,28],"product_tag":[],"class_list":{"0":"post-5488","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"fastener-coating-natural-finish","7":"fastener-coating-custom-color-coating","8":"fastener-coating-original-material","9":"fastener-coating-original-material-natural-finish","10":"fastener-material-stainless-steel","11":"fastener-type-bolts","12":"fastener-type-square-head","13":"product_cat-standard-fasteners","14":"product_cat-custom-non-standard-fasteners","16":"first","17":"instock","18":"shipping-taxable","19":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product\/5488","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=5488"}],"version-history":[{"count":2,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product\/5488\/revisions"}],"predecessor-version":[{"id":5493,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product\/5488\/revisions\/5493"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/media\/5489"}],"wp:attachment":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/media?parent=5488"}],"wp:term":[{"taxonomy":"fastener-coating","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/fastener-coating?post=5488"},{"taxonomy":"fastener-material","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/fastener-material?post=5488"},{"taxonomy":"fastener-type","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/fastener-type?post=5488"},{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product_brand?post=5488"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product_cat?post=5488"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/product_tag?post=5488"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}