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Home Product M12*40 Big Head Carriage Bolt Stainless Steel Heavy-Duty Construction Machinery Assembly
Big head carriage bolt M12*40

M12*40 Big Head Carriage Bolt Stainless Steel Heavy-Duty Construction Machinery Assembly

Big head carriage bolt M12x40
Large head carriage bolt M12x40
Mushroom head carriage bolt M12x40
Big head carriage bolt M12*40
Big head carriage bolt M12x40 (Large head/Mushroom head carriage bolt M12x40) with domed top and square neck for flush surface installation. Zinc-plated steel construction. 40mm length, 12mm diameter. Ideal for woodworking, structural assemblies, and machinery requiring anti-rotation security.
Categories:Fasteners & Fixings
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Product Description

The Big head carriage bolt M12x40, also known as Large head carriage bolt M12x40 or Mushroom head carriage bolt M12x40, is a heavy-duty fastener designed for industrial applications requiring enhanced load distribution and tamper resistance. With a diameter of 12mm and a total length of 40mm, it features a domed, oversized head (typical head diameter: 24-28mm) for increased surface contact and visual security. Made from grade 8.8 steel or stainless steel (A2/A4), it operates in temperatures from -50°C to +250°C, supporting vibration-resistant connections in construction, machinery, and transportation equipment. The bolt's full-thread design ensures uniform stress distribution, while its corrosion-resistant coatings (zinc-plated or hot-dip galvanized) extend service life in harsh environments. Key advantages include anti-rotation stability due to square neck integration and simplified installation, though its protrusive head may limit use in flush-mount scenarios. Common torque specifications range 90-110 Nm for M12 sizing.
Parameter Specification
Product Type Big head carriage bolt M12x40
Large head carriage bolt M12x40
Mushroom head carriage bolt M12x40
Thread Diameter M12 (12mm)
Length 40mm
Head Type Oval/Round enlarged head
Material Carbon steel
Strength Grade Grade 8.8
Surface Treatment Zinc-plated
Thread Pitch 1.75mm
Head Diameter 21.8mm
Head Height 8.5mm
Drive Type Square neck
Neck Length 10mm
Thread Length Full thread
Standard DIN 603
Torque Resistance 25 Nm
Application Wood-to-metal fastening
Structural connections
Decking installations
question:Can the company provide upgraded or alternative models?
answer:Yes, we offer various upgraded and alternative models based on availability and client needs.
question:Does the company offer technical selection services?
answer:Yes, we provide technical selection support to help you choose the best-suited products.
question:What shipping methods do you support?
answer:We support DHL, FedEx, UPS, and other major carriers. We’ll confirm the best option based on your location and timeline.
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 offer various upgraded and alternative models based on availability and client needs.
question:Does the company offer technical selection services?
answer:Yes, we provide technical selection support to help you choose the best-suited products.
question:What shipping methods do you support?
answer:We support DHL, FedEx, UPS, and other major carriers. We’ll confirm the best option based on your location and timeline.
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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