M6*120 Big Head Carriage Bolt Coach Bolt Heavy-Duty Zinc-Plated Steel Fastener [Brand]

Big head carriage bolt M6x120

Large head coach bolt 120mm

M6*120mm coach screw

Big head carriage bolt M6*120

Big head carriage bolt M6x120mm, large head coach bolt 120mm, and M6*120mm coach screw. Durable steel construction with zinc plating, designed for wood-to-metal fastening in construction or furniture assembly.

Specification

SEODescription

The Big head carriage bolt M6x120, also known as a Large head coach bolt 120mm or M6*120mm coach screw, is a heavy-duty fastener designed for secure structural connections. Featuring a domed head with a square neck (typically 10mm head height and 20mm diameter), this carbon steel bolt has a 6mm shaft diameter and 120mm length with partial threading (approximately 60mm threaded portion). It operates in -20°C to 120°C environments, supporting tensile strength up to 800MPa. Commonly used in wood-to-metal fastening for furniture manufacturing, agricultural equipment, and construction frameworks, its square neck prevents rotation during installation when paired with 6.5mm pre-drilled holes. The zinc-plated version offers basic corrosion resistance for indoor applications. Key advantages include high shear resistance and anti-loosening properties, though the prominent head may require countersinking in space-constrained applications. Compatible with M6 nuts and standard wrench sizes, this bolt excels in load-bearing joints requiring both security and visual cleanliness.

SEOSpecification

Parameter	Specification
Product Model	Big head carriage bolt M6x120
Thread Size	M6 (6mm diameter)
Total Length	120mm
Head Type	Large domed head
Head Diameter	20mm
Head Height	8mm
Thread Length	18mm (minimum)
Material	Carbon steel Grade 8.8
Surface Treatment	Zinc-plated
Alternative Name	Large head coach bolt 120mm
Thread Standard	ISO 1207 / DIN 603
Drive Type	Square neck under head
Neck Width	5.5mm
Application	Wood-to-metal fastening
Equivalent Term	M6*120mm coach screw
Tensile Strength	800 MPa
Torque Resistance	15 Nm max

SEOQandA

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question:Does your company have a professional product selection engineering team?
answer:Yes, our experienced team analyzes market trends and quality standards to help clients select competitive products.
question:Can you provide technical selection services for product customization?
answer:We offer technical consultation, including material analysis and design optimization, to meet specific customization requirements.

SEOQandA_Product

question:Difficulty during installation due to misalignment.
answer:Ensure proper hole alignment and use a guide tool for accurate placement.
question:Bolt threads stripping during tightening.
answer:Verify correct drill size and avoid over-torque; use a torque wrench.
question:Corrosion in humid environments.
answer:Opt for stainless steel or coated bolts and apply anti-corrosion lubricant.
question:Loose bolt under vibration.
answer:Use a lock washer or thread-locking adhesive for secure fastening.
question:Head damage from incorrect tools.
answer:Use a properly sized socket or wrench to prevent slippage and wear.