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Home Product Big head carriage bolt M12*30 - Large Head Coach Bolt, Heavy-Duty Zinc-Plated Fastener for Automotive & Construction
Big head carriage bolt M12*30

Big head carriage bolt M12*30 - Large Head Coach Bolt, Heavy-Duty Zinc-Plated Fastener for Automotive & Construction

Big head carriage bolt M12*30
M12x30 large head bolt
Big head M12 carriage bolt
Big head carriage bolt M12*30
Big head carriage bolt M12*30 (also referred to as M12x30 large head bolt or Big head M12 carriage bolt) features an enlarged domed head for secure fastening in wood and metal applications. Made from high-strength steel with optional zinc plating for corrosion resistance. Ideal for construction, machinery, and structural assemblies requiring robust clamping force.
Categories:Fasteners & Fixings
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Product Description

The Big head carriage bolt M12*30, also known as the M12x30 large head bolt or Big head M12 carriage bolt, is a heavy-duty fastener designed for industrial applications requiring high tensile strength and secure fastening. With an M12 thread diameter and 30mm shank length, it features an enlarged circular head for enhanced load distribution and surface grip. Constructed from grade 8.8 carbon steel or stainless steel variants, this bolt operates effectively within a temperature range of -50°C to 300°C. Ideal for structural assemblies, machinery, and automotive sectors, it supports torque values up to 90 Nm and offers corrosion resistance through optional galvanized coatings. The design ensures vibration resistance and easy visual inspection but requires specialized tools for installation. Typical applications include conveyor systems, construction frameworks, and heavy equipment.
Parameter Specification
Product Designation Big Head Carriage Bolt M12×30
Thread Size M12 (Metric coarse thread)
Shank Length 30 mm
Head Diameter 24 mm (Oversized square neck)
Head Height 7.5 mm
Drive Type Hexagonal Head (A/F 19 mm)
Material Grade Carbon steel (Grade 4.8/8.8), Stainless steel (A2/A4), Zinc-plated
Surface Treatment Plain, Hot-dip galvanized, Electroplated
Tensile Strength 400 MPa (Grade 4.8) / 800 MPa (Grade 8.8)
Torque Value 90-100 Nm (Grade 8.8 dry)
Standards Compliance DIN 603, ISO 7380
Alternate Names M12x30 Large Head Bolt, Big Head M12 Carriage Bolt
Application Heavy-duty mechanical assemblies, structural connections, wood-to-metal fastening
Packaging Unit Bulk packaging (100pcs/box) or customer-specific quantities
question:How is after-sales service handled if a refurbished product malfunctions during use?
answer:We offer replacement or refund and clarify refurbishment origin to address responsibility.
question:Do you accept payment after delivery?
answer:Payment terms are negotiable, but upfront payment or credit-approved agreements are preferred.
question:Do you provide technical selection support?
answer:Yes, our experts assist in model selection based on your requirements at no extra cost.
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:How is after-sales service handled if a refurbished product malfunctions during use?
answer:We offer replacement or refund and clarify refurbishment origin to address responsibility.
question:Do you accept payment after delivery?
answer:Payment terms are negotiable, but upfront payment or credit-approved agreements are preferred.
question:Do you provide technical selection support?
answer:Yes, our experts assist in model selection based on your requirements at no extra cost.
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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