M12*80 Big Head Carriage Bolt (Round Head Square Neck Bolt) - [Brand Name], Heavy Duty, Zinc Plated

Big head coach bolt M12

M12x80 carriage bolt

Large head bolt 80mm

Big head carriage bolt M12*80

Big Head Coach Bolt M12, also known as M12x80 Carriage Bolt or Large Head Bolt 80mm, features a durable steel construction with galvanized finish for corrosion resistance. Designed for heavy-duty applications, its oversized head ensures secure fastening in wood and metal surfaces.

Specification

SEODescription

The Big head coach bolt M12x80 carriage bolt is a heavy-duty fastener designed for robust structural applications, featuring a large, domed head (typically 24mm diameter) and a square neck to prevent rotation during installation. With a total length of 80mm and M12 thread diameter (1.75mm pitch), this large head bolt 80mm variant offers 8.8-grade tensile strength (minimum 800MPa) and comes with hot-dip galvanized or zinc-plated surface treatment for corrosion resistance. Its design enables direct integration with steel frameworks, timber constructions, and machinery assemblies, supporting load capacities up to 15kN in static applications. Operating effectively in temperatures from -30°C to 120°C, it's widely used in bridge construction, railway systems, and industrial equipment. Key advantages include enhanced bearing surface distribution and vibration resistance, though its protruding head may require countersinking in space-constrained environments.

SEOSpecification

Parameter	Specification
Product Designation	Big Head Coach Bolt M12
Thread Size	M12x1.75
Shank Length	80mm
Head Type	Large Domed Head
Head Diameter	24mm
Head Height	10mm
Drive Type	Square Neck
Material Grade	Steel 8.8
Surface Treatment	Zinc Plated
Tensile Strength	800 MPa
Thread Pitch	1.75mm
Shank Diameter	12mm
Standards Compliance	DIN 603
Weight	148g/unit

SEOQandA

question:What shipping methods do you support?
answer:We support DHL, Fedex, UPS, and other major shipping methods.
question:Do you accept payment after delivery?
answer:We require prepayment to ensure transaction security.
question:What is the production lead time?
answer:Standard lead time is 15-30 days, depending on product and order volume.

SEOQandA_Product

question:Misalignment during installation causing thread damage
answer:Use alignment tools or manually align before tightening to prevent cross-threading.
question:Bolt loosening under vibration or dynamic loads
answer:Apply thread-locking adhesive or use lock washers to maintain secure fastening.
question:Corrosion in harsh environments affecting durability
answer:Opt for stainless steel or galvanized bolts for improved corrosion resistance.
question:Insufficient grip length leading to joint failure
answer:Ensure bolt length exceeds total material thickness by at least 1.5x thread diameter.
question:Difficulty in wrench engagement due to rounded head
answer:Use properly sized wrench and avoid over-torque to prevent head deformation.