M12*40 Big Head Carriage Bolt Oval Head Coach Bolt Stainless Steel DIN 603

Big head carriage bolt M12x40

M12x40 carriage bolt 40mm

Heavy duty coach bolt M12

Big head carriage bolt M12*40

Big head carriage bolt M12x40 with durable construction, ideal for heavy-duty applications. This M12x40 carriage bolt 40mm length provides secure fastening for construction, machinery, and woodworking projects. Heavy duty coach bolt M12 ensures reliable performance and strength in demanding environments.

Specification

SEODescription

The Big head carriage bolt M12x40 is a heavy-duty coach bolt M12 designed for robust applications, featuring a 12mm diameter and 40mm shank length (M12x40 carriage bolt 40mm). Constructed from high-grade steel with a galvanized finish, it offers corrosion resistance and a load capacity of up to 8.8kN. The large, domed head ensures secure fastening and prevents pull-through in wood or metal surfaces. It operates effectively across temperatures from -20°C to 120°C, ideal for construction, machinery, and agricultural equipment. While its heavy-duty design provides exceptional durability and vibration resistance, the oversized head may limit use in confined spaces. Compatible with standard M12 nuts, this bolt requires pre-drilled holes and is commonly used in structural assemblies requiring high shear strength and stability.

SEOSpecification

Parameter	Specification
Product Model	Big Head Carriage Bolt M12x40
Thread Diameter	M12 (12mm)
Shank Length	40mm
Head Type	Oversized Domed Head with Square Neck
Material Grade	Grade 8.8 Carbon Steel
Surface Treatment	Hot-Dip Galvanized (55μm)
Torque Capacity	120 N·m (Dry Condition)
Thread Pitch	1.75mm (Standard Coarse Thread)
Alternative Designation	M12x40 Carriage Bolt 40mm
Weight Capacity	Heavy Duty Coach Bolt M12 (2500kg Static Load)
Compliance Standard	DIN 603 / ISO 10509

SEOQandA

question:Do you have a professional product selection engineering team?
answer:Yes, our expert team rigorously selects products based on market trends and client needs, ensuring compliance with international standards.
question:Why should we purchase from you?
answer:As Asia's leading industrial automation trader with 20+ years' experience, we ensure reliable quality, uphold reputation, and 85% clients are repeat customers.
question:Can you provide upgraded or alternative models?
answer:Yes, we offer flexible solutions for upgraded or alternative models to meet diverse needs and ensure timely supply.

SEOQandA_Product

question:Incorrect bolt head seating during installation.
answer:Ensure proper alignment and use correct wrench size for square neck to prevent rotation.
question:Thread stripping under high torque.
answer:Verify thread compatibility and use lubricant to reduce friction during tightening.
question:Corrosion in harsh environments.
answer:Select stainless steel or galvanized bolts for improved corrosion resistance.
question:Loose connection due to vibration.
answer:Apply thread-locking adhesive or use a lock washer to maintain tension.
question:Difficulty in removing damaged bolt.
answer:Use penetrating oil and extractor tools to remove seized or stripped bolts safely.