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Home Product Big Head Carriage Bolt M8*20 Coach Bolt, High-Strength Zinc-Plated for Woodworking, Construction, Furniture Assembly
Big head carriage bolt M8*20

Big Head Carriage Bolt M8*20 Coach Bolt, High-Strength Zinc-Plated for Woodworking, Construction, Furniture Assembly

Big head carriage bolt M8x20
M8x20 large head carriage bolt
Heavy duty M8x20 carriage bolt
Big head carriage bolt M8*20
Big head carriage bolt M8x20, also known as M8x20 large head carriage bolt, features a sturdy construction for heavy-duty applications. Designed with a robust head and durable M8x20 thread, ideal for construction, machinery, and automotive uses. Zinc-plated finish resists corrosion. Reliable fastening solution for industrial and structural projects.
Categories:Fasteners & Fixings
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Product Description

The Big head carriage bolt M8x20 is a heavy-duty fastener designed for robust structural applications, featuring an M8x20 thread size with a large, domed head for enhanced load distribution. Constructed from high-grade carbon steel with a zinc-plated finish, this M8x20 large head carriage bolt offers corrosion resistance and a tensile strength rating of 8.8, supporting torque values up to 25 Nm. The square neck beneath the head prevents rotation during installation, ensuring secure fastening in wood, metal, or composite materials. Operating effectively in temperatures ranging from -30°C to 150°C, this heavy duty M8x20 carriage bolt is widely used in construction, automotive assemblies, and industrial machinery for its durability and vibration-resistant design. Key advantages include high shear strength and tamper-resistant aesthetics, though installation requires precise pre-drilled holes to accommodate the square neck.
Parameter Specification
Product Designation Big head carriage bolt M8x20
Thread Size M8x20 (Metric coarse thread)
Head Diameter 16 mm (Large domed head)
Material Grade Carbon steel (Grade 8.8) / Stainless steel (A2-70)
Surface Treatment Zinc-plated, hot-dip galvanized, or plain
Carriage Bolt Type Heavy duty M8x20 carriage bolt (Square neck under head)
Tensile Strength ≥800 MPa (Grade 8.8)
Driving Type Hexagonal socket or external wrenching head
Standard Compliance DIN 603 / ISO 10509
Applications Structural assemblies, machinery, heavy-duty construction
Model Variants M8x20 large head carriage bolt, Heavy duty M8x20 carriage bolt
question:Can the company provide upgraded or alternative models?
answer:Yes, we can recommend upgraded or alternative models based on availability and share parameter differences if needed.
question:Can you provide shipment photos or procurement dates for similar products?
answer:Yes, we can share shipment photos upon request, but procurement dates vary and require confirmation per order.
question:Why were the product labels removed upon delivery?
answer:Labels might be removed due to stock rotation or logistics policies, but product quality and functionality remain unaffected.
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:Can the company provide upgraded or alternative models?
answer:Yes, we can recommend upgraded or alternative models based on availability and share parameter differences if needed.
question:Can you provide shipment photos or procurement dates for similar products?
answer:Yes, we can share shipment photos upon request, but procurement dates vary and require confirmation per order.
question:Why were the product labels removed upon delivery?
answer:Labels might be removed due to stock rotation or logistics policies, but product quality and functionality remain unaffected.
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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