The DongCheng HD071012 12-Inch (300mm) G-Clamp is the largest, most robust model in the G-clamp series, engineered for heavy industrial fabrication, structural steel construction, and massive timber joinery. Built with an oversized malleable cast iron frame, it provides high clamping capacity without risking distortion or joint failure.

Featuring an extra-thick lead screw with heavy-duty T-shaped threading, it ensures maximum mechanical leverage and smooth torque transmission while preventing thread stripping. The wide-contact swivel pad self-aligns against irregular surfaces, and the extended sliding bar handle provides leverage to lock massive workpieces securely in place.

Key Features

• Maximum 12" (300mm) Jaw Opening: Clamps large structural steel sections, thick beams, and complex multi-piece setups.
• Massive Malleable Cast Iron Body: Engineered with reinforced ribs to resist bowing and deflection under heavy force.
• Heavy-Duty T-Shaped Spindle: Precision thread geometry resists thread deformation and provides smooth turning under heavy loads.
• Extra-Large Self-Aligning Pad: Broad swivel foot distributes clamping pressure evenly over large contact areas.
• High-Leverage Sliding Crossbar: Extra-long Tommy bar handle maximizes turning power and allows rapid tightening.

Applications

• Heavy structural steel fabrication, bridge repairs, and high-load frame welding
• Shipbuilding, heavy timber laminating, and commercial architectural woodworking
• Industrial machinery rebuilding, plant maintenance, and chassis alignment
• Large boiler, container, and tank manufacturing setups

Technical Specifications

Size/Model-wise Table