M12*45 Big Head Carriage Bolt - Heavy Duty Hex Bolt, Galvanized Steel Construction Fastener

Carriage bolt M12x45

Large head coach bolt

M12 carriage bolt 45mm

Big head carriage bolt M12*45

Carriage bolt M12x45, also known as Large head coach bolt, designed for wood-to-metal applications. M12 carriage bolt 45mm length with domed head, carbon steel construction, zinc-plated for corrosion resistance.

Specification

SEODescription

The Carriage bolt M12x45, also known as Large head coach bolt or M12 carriage bolt 45mm, features a distinctive domed head with a square neck designed for secure fastening in wood and metal applications. This 45mm long bolt with 12mm diameter shaft offers tensile strength up to 8.8 grade (800 MPa), zinc-plated surface for corrosion resistance, and operates in temperatures from -20°C to 120°C. Its oversized head (typically 24mm diameter) provides enhanced load distribution, making it ideal for structural connections in construction, machinery assembly, and transportation equipment. The integrated square neck prevents rotation during installation, though requires precisely punched/square holes for proper seating. While offering superior shear resistance, the large head profile may limit use in space-constrained applications. Compatible with DIN 603 standards for industrial interoperability.

SEOSpecification

Parameter	Specification
Product Model	Carriage Bolt M12x45
Alternative Name	Large Head Coach Bolt, M12 Carriage Bolt 45mm
Thread Diameter	12 mm (M12)
Shank Length	45 mm (Under Head)
Head Type	Domed Large Round Head
Head Diameter	24 mm ±0.5 mm
Head Height	8 mm ±0.3 mm
Square Neck	7.5 mm x 7.5 mm
Thread Pitch	1.75 mm (Standard Coarse)
Material Grade	Carbon Steel (Grade 4.8/8.8) / Stainless Steel (A2-70)
Surface Finish	Zinc Plated (5-8μm) / Plain / Hot Dip Galvanized
Standard Compliance	DIN 603 / ISO 1445 / ASME B18.5

SEOQandA

question:Do you provide technical selection services?
answer:Yes, we offer expert technical selection guidance based on your project needs. Contact us for details.
question:Do you accept payment after delivery?
answer:Payment terms vary by order. We typically require upfront deposits or LC; contact sales for flexible options.
question:Can you customize products to meet specific requirements?
answer:Yes, we provide tailored solutions. Share your specifications, and our team will evaluate feasibility.

SEOQandA_Product

question:How to prevent the bolt head from rotating during installation?
answer:Use a wrench to secure the square neck under the head or select bolts with serrated heads.
question:What causes corrosion on M12*45 carriage bolts?
answer:Exposure to moisture without proper coating. Choose stainless steel or galvanized bolts.
question:How to avoid loosening under vibration?
answer:Apply thread-locking adhesive or use lock washers to maintain tension.
question:Why does the bolt length not fit the application?
answer:Incorrect measurement of material thickness. Verify required grip length before purchase.
question:How to address thread damage during installation?
answer:Ensure proper alignment and use a thread guide or pre-drilled pilot hole.