M8x50 Big Head Carriage Bolt - Heavy Duty Structural Bolt, Hex Flange Head

Big head carriage bolt M8x50

M8x50 coach bolt big head

Large head M8-50 carriage bolt

Big head carriage bolt M8*50

Big head carriage bolt M8x50, M8x50 coach bolt with large head design, large head M8-50 carriage bolt. Heavy-duty fastener for wood and metal applications. Features durable construction, corrosion-resistant coating, and secure grip. Size: M8x50.

Specification

SEODescription

The Big head carriage bolt M8x50, also known as the M8x50 coach bolt big head or Large head M8-50 carriage bolt, is a heavy-duty mechanical fastener designed for secure structural connections. Featuring an 8mm diameter and 50mm length with full threading, it incorporates a large, domed head and a square neck beneath to prevent rotation during installation. Typically crafted from grade 4.8 carbon steel or stainless steel (A2/A4), it offers corrosion resistance through zinc plating or hot-dip galvanization. With a tensile strength of 420MPa (grade 4.8), this bolt operates reliably in temperatures from -20°C to 120°C. Its oversized head ensures load distribution and tamper-proof anchoring, ideal for wood-to-metal joints, machinery assembly, and construction frameworks. Commonly used in furniture manufacturing, industrial equipment, and outdoor infrastructure, its key advantages include vibration resistance and tool-free tightening in pre-drilled materials. Limitations include potential incompatibility with narrow spaces due to the prominent head profile. The bolt requires no electrical connectivity but serves critical roles in mechanical stability across automotive, marine, and architectural applications.

SEOSpecification

Parameter	Specification
Product Model	Big head carriage bolt M8x50
Alternative Designation	M8x50 coach bolt big head
Thread Size	M8 (8mm diameter)
Shank Length	50mm
Head Type	Large domed head with square neck
Head Diameter	16mm
Material	Carbon steel / Stainless steel (A2/A4)
Surface Treatment	Zinc-plated / Hot-dip galvanized
Standard Compliance	DIN 603 / ISO 10642
Tensile Strength	8.8 grade (800 MPa)
Thread Pitch	1.25mm (standard coarse thread)
Square Neck Dimensions	8mm x 8mm
Applications	Wood-to-metal fastening, structural connections

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SEOQandA_Product

question:Difficulty during installation due to misaligned threads.
answer:Use a guide tool or align threads manually before tightening.
question:Bolt loosening under vibration.
answer:Apply thread-locking adhesive or use a spring washer.
question:Incorrect bolt length causing insufficient grip.
answer:Verify specifications and measure actual dimensions before purchase.
question:Material incompatibility leading to corrosion.
answer:Select stainless steel or coated bolts for corrosive environments.
question:Head stripping during torque application.
answer:Use a properly sized wrench and avoid exceeding recommended torque limits.