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Home Product M12*25 Big Head Carriage Bolt - Large Head Coach Bolt for Heavy-Duty Construction, Machinery Fastening
Big head carriage bolt M12*25

M12*25 Big Head Carriage Bolt - Large Head Coach Bolt for Heavy-Duty Construction, Machinery Fastening

Big Head Carriage Bolt M12x25
M12x25 Coach Bolt
Square Neck Bolt M12x25
Big head carriage bolt M12*25
Big Head Carriage Bolt M12x25, also called M12x25 Coach Bolt or Square Neck Bolt M12x25, features a domed head with square neck design to prevent rotation during installation. Designed for wood and metal applications, providing secure fastening in construction, furniture assembly, and outdoor projects. Zinc-plated carbon steel, 12mm diameter, 25mm length.
Categories:Fasteners & Fixings
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Product Description

The Big Head Carriage Bolt M12x25 (also known as M12x25 Coach Bolt or Square Neck Bolt M12x25) is a heavy-duty fastener designed for structural applications in construction, automotive, and agricultural machinery. Featuring a 12mm diameter and 25mm shaft length, its oversized domed head provides enhanced bearing surface, while the square neck beneath prevents rotation during installation. Constructed from grade 8.8 carbon steel with hot-dip galvanized coating, it offers tensile strength up to 800 MPa and corrosion resistance for operation in temperatures ranging from -30°C to +150°C. The square neck design eliminates need for washers in wood applications, though requires precise alignment in metal surfaces. Typical uses include joining heavy timber beams, securing machinery bases, and assembling structural steel frameworks where vibration resistance and load distribution are critical. Key limitations include restricted accessibility in tight spaces due to the large head profile.
Parameter Specification
Product Designation Big Head Carriage Bolt M12x25, M12x25 Coach Bolt, Square Neck Bolt M12x25
Thread Size M12 (Metric Coarse Thread)
Thread Pitch 1.75 mm
Shank Length 25 mm
Head Diameter 24 mm (Oversized Dome Head)
Neck Type Integrated Square Neck
Material Grade Carbon Steel Class 8.8
Surface Finish Hot-Dip Galvanized (ISO 1461)
Tensile Strength 800 MPa min
Drive Type Hexagonal Nut Compatibility
Standard Compliance DIN 603, ISO 898-1
question:Do you have a professional product selection engineering team?
answer:Yes, we have a dedicated team of product selection experts skilled in market analysis and product optimization.
question:What shipping methods do you support?
answer:We support global shipping via DHL, FedEx, UPS, and other major logistics providers.
question:Do you offer after-sales support?
answer:Yes, we provide comprehensive after-sales support, including replacements, returns, and technical assistance.
question:Can the company ensure stable product supply?
answer:Yes, we maintain long-term partnerships and strict inventory management.
question:Why is there a transaction fee?
answer:The fee covers payment processing and administrative costs for secure transactions.
question:Do you have a professional product selection engineering team?
answer:Yes, we have a dedicated team of product selection experts skilled in market analysis and product optimization.
question:What shipping methods do you support?
answer:We support global shipping via DHL, FedEx, UPS, and other major logistics providers.
question:Do you offer after-sales support?
answer:Yes, we provide comprehensive after-sales support, including replacements, returns, and technical assistance.
question:Can the company ensure stable product supply?
answer:Yes, we maintain long-term partnerships and strict inventory management.
question:Why is there a transaction fee?
answer:The fee covers payment processing and administrative costs for secure transactions.
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