PROFESSIONAL MANUFACTURER OF HARDWARE PRODUCTS
Jinan Meierde Industry Co., Ltd
carriage bolt vs lag bolt
关键词：
Carriage bolt，cup head square neck bolt
Carriage Bolts – Round Head Square Neck Fasteners A carriage bolt (also known as a coach bolt or round head square neck bolt) is a type of fastener designed to securely join two or more workpieces together. Featuring a distinctive domed or rounded head and a square section beneath the head, carriage bolts deliver both functional reliability and a clean, finished appearance Key Features Round, Domed Head – The smooth, rounded head provides a professional, finished look with no drive slot, making it ideal for applications where a flush or low-profile surface is desired. Square Neck – The square-shaped section directly under the head embeds into the workpiece (typically wood or a square hole) to prevent the bolt from rotating when the nut is tightened. This self-locking design ensures a secure, vibration-resistant joint. Threaded Shank – Available in both fully threaded and partially threaded configurations, the shank accepts a washer and nut on the opposite side for reliable clamping force Materials & Grades Carriage bolts are available in a variety of materials and strength grades to suit different application requirements: Material Grades / Classes Surface Finishes Carbon Steel Grade 4.6, 4.8, 5, 8.8, 10.9 Plain, Zinc-Plated, Hot-Dip Galvanized, Black Oxide, Chrome-Plated Stainless Steel A2-70 (304), A4-80 (316) Plain, Passivated, Polished Alloy Steel Grade 5, Grade 8 Various coatings available Applications Carriage bolts are widely used in woodworking, construction, and general assembly where a smooth, finished appearance is desired on one side of the joint. Common applications include: Decking and outdoor structures – fences, wooden playsets, and pergolas Timber construction – securing beams, joists, and framing components Furniture assembly – tables, benches, and outdoor seating Metal-to-wood connections – attaching metal brackets or hardware to wooden surfaces Maintenance and repair – automotive, manufacturing, and general industrial applications
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