PROFESSIONAL MANUFACTURER OF HARDWARE PRODUCTS
Jinan Meierde Industry Co., Ltd
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
Keyword:
Carriage bolts
bolts
screws
fastener
fasteners
hardware
carriage bolt
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| ①,dsmin ≈ 螺纹直径 ②,公称长度L≤75mm和规格d≤M12的螺栓，允许制出全螺纹。 |
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