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Home Product Big Head Carriage Bolt M8*25 Large Head Coach Bolt, Galvanized Steel for Construction & Machinery
Big head carriage bolt M8*25

Big Head Carriage Bolt M8*25 Large Head Coach Bolt, Galvanized Steel for Construction & Machinery

M8x25 big head carriage bolt
Large head coach bolt M8x25
Heavy-duty flange bolt M8x25
Big head carriage bolt M8*25
M8x25 big head carriage bolt, Large head coach bolt M8x25, Heavy-duty flange bolt M8x25. Durable steel construction with galvanized anti-rust finish. Designed for secure fastening in construction, machinery, and furniture assemblies. Oversized head distributes load effectively.
Categories:Fasteners & Fixings
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Product Description

The M8x25 big head carriage bolt, also known as Large head coach bolt M8x25 or Heavy-duty flange bolt M8x25, features an 8mm diameter shaft with 25mm threading length and a broad, low-profile domed head integrated with a square neck for rotational resistance during installation. Crafted from grade 8.8 steel with zinc-plated corrosion protection, this structural fastener delivers 800 MPa tensile strength and operates reliably in temperatures from -30°C to +120°C. Designed for permanent assemblies requiring vibration resistance, it's widely used in construction frameworks, machinery bases, truck chassis, and industrial equipment mounting. The oversized head distributes clamping force effectively across surfaces while the square neck prevents bolt rotation, though installation requires precise alignment of the square collar with pre-punched substrates. Its robust design resists shear forces but requires adequate clearance for the protruding head profile.
ParameterSpecification
Product DesignationBig head carriage bolt M8x25
Thread SizeM8 (8mm diameter)
Length25mm under-head
Head TypeOversized domed head with square neck
Head Diameter20mm ±0.5mm
Material GradeCarbon steel Grade 8.8 / Stainless A2-70
Surface TreatmentZinc-plated (5-8μm) or HDG
Tensile Strength800 MPa (Grade 8.8)
Drive TypeSquare neck (13mm collar)
Flange DesignIntegrated washer-style base
Standards ComplianceDIN 603 / ISO 10509
Alternative NamesLarge head coach bolt M8x25, Heavy-duty flange bolt M8x25
question:Can I apply for low-value declaration for shipments?
answer:Yes, low-value declaration is available for eligible shipments under applicable regulations.
question:Can you provide shipping photos and purchase dates of similar products?
answer:Yes, we can share relevant product photos and purchase details upon request.
question:Are samples available before placing bulk orders?
answer:Samples are offered upon approval; shipping costs may apply depending on the arrangement.
question:Can the company ensure stable product supply?
answer:Yes, we maintain long-term partnerships and strict inventory management.
question:Why is there a transaction fee?
answer:The fee covers payment processing and administrative costs for secure transactions.
question:Can I apply for low-value declaration for shipments?
answer:Yes, low-value declaration is available for eligible shipments under applicable regulations.
question:Can you provide shipping photos and purchase dates of similar products?
answer:Yes, we can share relevant product photos and purchase details upon request.
question:Are samples available before placing bulk orders?
answer:Samples are offered upon approval; shipping costs may apply depending on the arrangement.
question:Can the company ensure stable product supply?
answer:Yes, we maintain long-term partnerships and strict inventory management.
question:Why is there a transaction fee?
answer:The fee covers payment processing and administrative costs for secure transactions.
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