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Home Product Big Head Carriage Bolt M8x40 Coach Bolt Galvanized High Strength Automotive Construction Hardware
Big head carriage bolt M8*40

Big Head Carriage Bolt M8x40 Coach Bolt Galvanized High Strength Automotive Construction Hardware

M8x40 carriage bolt
heavy duty big head bolt
large head M8 bolt
Big head carriage bolt M8*40
M8x40 heavy-duty big head carriage bolt with large head design ensures secure fastening in structural, automotive, and machinery applications. Corrosion-resistant zinc-plated finish for durability.
Categories:Fasteners & Fixings
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Product Description

The M8x40 carriage bolt is a heavy-duty big head bolt designed for robust industrial applications, featuring an M8 thread diameter, 40mm shank length, and a large head M8 bolt design for enhanced load distribution. Constructed from high-grade carbon steel with zinc plating, it operates reliably in temperatures from -30°C to +120°C. The oversized circular head (approx. 16mm diameter) prevents pull-through in soft materials while the square neck resists rotation during tightening. Ideal for construction, machinery assembly, and structural framing industries, this large head M8 bolt excels in vibration-prone environments due to its secure fastening capability. Though lacking integrated electronics, its mechanical durability compensates, with a tensile strength rating of 8.8. Limitations include limited compatibility with thinner materials due to head size. The corrosion-resistant finish ensures longevity in outdoor or high-moisture conditions.
Parameter Specification
Thread Size M8x40
Shank Length 40 mm
Head Diameter 16 mm
Head Height 6.5 mm
Material Carbon Steel
Surface Finish Zinc-plated
Strength Grade Class 8.8
Standards ASTM A307, DIN 603
Application Heavy-duty structural connections
Installation Tool 17 mm Wrench
Packaging Quantity 50 pcs/box
question:Do you have a professional product selection engineering team?
answer:Yes, our dedicated team ensures quality and market-aligned product selection.
question:Can shipments apply for low-value declaration?
answer:Subject to destination country regulations; tariffs may still apply.
question:What payment methods do you accept?
answer:We accept TT, PayPal, and other mainstream payment methods.
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, our dedicated team ensures quality and market-aligned product selection.
question:Can shipments apply for low-value declaration?
answer:Subject to destination country regulations; tariffs may still apply.
question:What payment methods do you accept?
answer:We accept TT, PayPal, and other mainstream payment methods.
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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