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Home Product M12*55 Big Head Carriage Bolt Heavy-Duty Round Head Machine Bolt for Construction Machinery
Big head carriage bolt M12*55

M12*55 Big Head Carriage Bolt Heavy-Duty Round Head Machine Bolt for Construction Machinery

Big head carriage bolt M12
Large head M12x55 bolt
M12x55 carriage bolt hardware
Big head carriage bolt M12*55
Big head carriage bolt M12 with large head design, M12x55 carriage bolt hardware for heavy-duty fastening, durable and corrosion-resistant, ideal for construction and machinery applications. Large head M12x55 bolt ensures secure and stable connections in wood/metal surfaces.
Categories:Fasteners & Fixings
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Product Description

The Big head carriage bolt M12*55, also referred to as Large head M12x55 bolt or M12x55 carriage bolt hardware, is a heavy-duty fastener designed for structural applications in construction, machinery, and automotive industries. With a thread diameter of 12mm and length of 55mm, it features a distinctive oversized domed head for enhanced load distribution and a square neck to resist rotation during installation. Typically made from grade 8.8 carbon steel or stainless steel, it offers tensile strengths up to 800 MPa and operates reliably in temperatures from -30°C to 250°C. Surface treatments like hot-dip galvanizing provide corrosion resistance for outdoor use. Advantages include vibration resistance and secure anchoring in wood or metal, though the square neck may require pre-drilled square holes in certain applications. Its design ensures high shear strength for joining beams, brackets, and heavy equipment components.
Parameter Specification
Product Model Big head carriage bolt M12x55
Thread Diameter 12 mm (M12)
Shank Length 55 mm
Head Type Large domed head with square neck
Material Carbon steel / Stainless steel
Thread Type ISO metric coarse thread
Tensile Strength Class 8.8 (carbon steel) / A2-70 (stainless)
Surface Treatment Zinc-plated / Plain
Drive Type Square neck under head
Standards DIN 603 / ISO 10509
Applications Wood-to-metal fastening, structural assemblies
question:Do you have a professional product selection engineering team?
answer:Yes, we have a dedicated team of engineers specializing in market trends and product research.
question:What payment methods do you accept?
answer:We support TT, PayPal, L/C, and other mainstream payment methods.
question:What shipping methods do you offer?
answer:We provide shipping via DHL, FedEx, UPS, and other global carriers for reliable delivery.
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 engineers specializing in market trends and product research.
question:What payment methods do you accept?
answer:We support TT, PayPal, L/C, and other mainstream payment methods.
question:What shipping methods do you offer?
answer:We provide shipping via DHL, FedEx, UPS, and other global carriers for reliable delivery.
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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