M8*70 Big Head Carriage Bolt Heavy Duty Industrial Grade DIN 603 ProSeries Fastener

Big head carriage bolt M8

Large head carriage bolt 70mm

Carriage bolt with big head

Big head carriage bolt M8*70

Big head carriage bolt M8, 70mm length with large head design for secure fastening in wood and construction applications. Carriage bolt with big head ensures durability and stability.

Specification

SEODescription

The Big head carriage bolt M8*70, also known as Large head carriage bolt 70mm or Carriage bolt with big head, features a distinctive domed head measuring 24mm diameter and 8mm height, paired with a 70mm long shank (thread length 40mm). Manufactured from grade 8.8 carbon steel with zinc-plated finish, this fastener operates within -20°C to 120°C temperature ranges. The square neck beneath the 16mm-wide head prevents rotation during installation, requiring 13mm pre-drilled holes. Primarily used in construction, agricultural machinery, and furniture assembly, its advantages include vibration resistance and smooth surface finish, though the oversized head may limit use in tight spaces. The 500MPa tensile strength ensures reliable performance in structural applications, while potential corrosion in marine environments remains its primary limitation.

SEOSpecification

Parameter	Specification
Product Model	Big head carriage bolt M8*70
Alternate Designations	Large head carriage bolt 70mm, Carriage bolt with big head
Diameter (M)	M8
Length (L)	70 mm
Head Type	Dome-shaped with square neck
Head Diameter	22 mm ±0.5 mm
Thread Pitch	1.25 mm
Material Grade	Stainless Steel A2/AISI 304
Tensile Strength	≥500 MPa
Surface Treatment	Zinc plating (5-8 μm) / Hot-dip galvanized
Drive Type	Square neck under head
Standards Compliance	DIN 603 / ISO 10509
Torque Capacity	25-30 Nm (dry)
Applications	Construction, Woodworking, Automotive

SEOQandA

question:Why should I purchase from you?
answer:As Asia's leading industrial automation trader with 20 years' experience, we ensure reliable quality, uphold strong reputation, and 85% clients are repeat customers.
question:What makes your company reliable?
answer:With two decades in industry automation, we prioritize product quality and client trust, proven by 85% repeat business from loyal customers.
question:Can I arrange official courier pickup myself?
answer:Yes, self-arranged official courier pickup is available. Contact our team for coordination details.

SEOQandA_Product

question:Loose connection over time
answer:Use lock washers or thread-locking adhesive to prevent vibration-induced loosening.
question:Difficulty installing into threaded holes
answer:Ensure proper alignment; clean or repair damaged threads with a tap.
question:Corrosion in harsh environments
answer:Opt for stainless steel or coated bolts for enhanced corrosion resistance.
question:Insufficient thread engagement due to length
answer:Verify bolt length meets minimum thread engagement (1x diameter).
question:Head damage during tightening
answer:Use correctly sized wrench and avoid over-torquing to prevent head stripping.