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Home Product Big Head Carriage Bolt M8x30 | Dome Head, Zinc Plated, High-Strength, Automotive Fasteners, Construction Hardware
Big head carriage bolt M8*30

Big Head Carriage Bolt M8x30 | Dome Head, Zinc Plated, High-Strength, Automotive Fasteners, Construction Hardware

Big head M8x30 bolt
M8 carriage bolt 30mm
Heavy duty carriage bolt M8
Big head carriage bolt M8*30
Big head M8x30 bolt with a wide domed head and square neck, M8 carriage bolt 30mm length, zinc-plated steel construction for enhanced durability. Designed for heavy-duty construction, woodworking, or machinery assembly applications. Heavy duty carriage bolt M8 ensures secure fastening in demanding environments.
Categories:Fasteners & Fixings
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Product Description

The Big head M8x30 bolt is a heavy-duty carriage bolt designed for robust industrial applications in construction, machinery, and structural assemblies. Featuring a M8 thread diameter, 30mm length, and a large domed head for secure fastening, it ensures high clamping force and vibration resistance. Manufactured from grade 8.8 steel with a galvanized or zinc-plated finish, it offers corrosion resistance and durability in harsh environments. This M8 carriage bolt 30mm variant operates reliably across temperatures from -40°C to 120°C, supporting static and dynamic loads up to 800kg. Its hexagonal neck prevents rotation during installation, though pre-drilled holes are required for alignment. The heavy duty carriage bolt M8 excels in securing heavy materials like steel plates or timber but lacks compatibility with non-standardized fixtures.
Parameter Specification
Product Model Big head M8x30 bolt, M8 carriage bolt 30mm, Heavy duty carriage bolt M8
Thread Diameter M8 (8mm)
Length Under Head 30mm
Thread Pitch 1.25mm (Metric coarse)
Head Type Round head with square neck
Material Carbon steel Grade 4.8/8.8
Surface Treatment Zinc-plated (5-8μm)
Tensile Strength 400 MPa (Grade 4.8) / 800 MPa (Grade 8.8)
Applications Wood-to-metal fastening, structural connections, heavy machinery
Square Neck Dimensions 4.5mm height x 7.5mm width
Head Diameter 14.5mm ±0.3mm
Drive Type Hex key installation (square neck retention)
Standard Compliance DIN 603 / ISO 4014
Temperature Range -30°C to +120°C (zinc-plated)
question:Does the company provide technical selection services?
answer:Yes, we offer expert technical selection guidance and tailored solutions to meet your project requirements.
question:Why are shipping costs high? Are there cheaper options?
answer:Shipping costs depend on logistics factors. We provide economical options upon request and adjust based on volume/urgency.
question:Can you assist with product customization specifications?
answer:Absolutely, we specialize in customizing products to align with your specific technical and design needs.
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:Does the company provide technical selection services?
answer:Yes, we offer expert technical selection guidance and tailored solutions to meet your project requirements.
question:Why are shipping costs high? Are there cheaper options?
answer:Shipping costs depend on logistics factors. We provide economical options upon request and adjust based on volume/urgency.
question:Can you assist with product customization specifications?
answer:Absolutely, we specialize in customizing products to align with your specific technical and design needs.
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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