M6*65 Big Head Carriage Bolt Coach Bolt Heavy-Duty Industrial Grade Fasteners

Big head carriage bolt

M6x65 coach bolt

Large head coach bolt

Big head carriage bolt M6*65

Big head carriage bolt, M6x65 coach bolt with large head design for secure fastening in wood-to-metal applications. This large head coach bolt features a smooth dome top and square neck to prevent rotation during installation. The M6x65 size provides durable steel construction with rust-resistant finish, ideal for construction, furniture assembly, and machinery projects requiring flush-mounted, tamper-resistant fasteners.

Specification

SEODescription

The Big head carriage bolt (M6x65 coach bolt) is a heavy-duty fastening component featuring a large, domed head with a square neck to prevent rotation during installation. This Large head coach bolt measures 6mm in diameter and 65mm in length, manufactured from grade 5 carbon steel with zinc plating for corrosion resistance. Designed for direct mechanical connections between structural components, it typically withstands tensile loads up to 11.3kN and shear forces of 8.1kN. The bolt operates effectively across temperature ranges from -20°C to 120°C, requiring no electrical interfaces or communication protocols. Its square neck interface ensures secure engagement with wood, metal, or composite materials without separate locking mechanisms. Widely used in construction, railway infrastructure, and heavy equipment assembly, this fastener offers exceptional vibration resistance and visual security due to its prominent head profile. Primary limitations include mandatory pre-drilled square holes for installation and reduced accessibility in confined spaces due to the oversized head dimensions.

SEOSpecification

Parameter	Specification
Product Type	Big Head Carriage Bolt / M6x65 Coach Bolt / Large Head Coach Bolt
Thread Size	M6 (6mm Metric Thread)
Shank Length	65mm
Head Diameter	19mm (Oversized Domed Head)
Head Height	8mm
Material	Grade 4.8 Carbon Steel
Surface Finish	Zinc-plated (Corrosion Resistant)
Square Neck	4.5mm Height, Anti-rotation Design
Drive Type	Slotted Flat Head
Standard Compliance	DIN 603, ISO 10509
Application	Wood-to-Metal Fixation, Construction Applications

SEOQandA

question:What if received refurbished items with defects?
answer:We offer free replacement for confirmed refurbished items under warranty.
question:How are orders shipped?
answer:Orders ship via DHL, Fedex, UPS with tracking provided within 24 hours.
question:Why are product labels removed?
answer:Labels are removed per regional compliance; product functionality remains unaffected.

SEOQandA_Product

question:Bolt head slips during installation.
answer:Use correct hex key size and ensure proper seating in the countersunk head.
question:Threads strip when tightening.
answer:Align threads properly, avoid overtightening, and use lubrication if needed.
question:Bolt loosens under vibration.
answer:Apply thread-locking adhesive or use a lock washer for secure fastening.
question:Corrosion occurs in humid environments.
answer:Opt for stainless steel or coated variants to enhance corrosion resistance.
question:Insufficient grip length causes weak joints.
answer:Verify required clamp length; ensure M6*65 matches material thickness.