Screw Clamp Bessey GZ 400/120 mm steel workshop clamp — model BY GZ40

Bessey screw clamp GZ 400/120 mm (model BY GZ40) is a steel workshop clamp designed to hold and secure workpieces during metalworking and general workshop tasks. With a 400 mm bar length and 120 mm jaw capacity, the clamp provides a rigid and repeatable clamping force through a threaded screw mechanism. The tool is intended for use in assembly, welding, filing and repair work in professional and hobby environments where controlled, stable clamping is required.

Advantages

The steel construction ensures high rigidity and durability, allowing the clamp to maintain consistent pressure over repeated uses. The threaded screw mechanism enables fine, gradual tightening for accurate positioning and strong holding power. A long bar length offers extended reach and versatility for larger or awkwardly shaped workpieces, while the compact jaw profile allows access in confined spaces typical of workshop and metalworking tasks.

Suitable for

• Holding metal parts during welding and brazing
• Clamping workpieces for filing, grinding or sanding
• Assembly and joining operations in the workshop
• Repair and maintenance tasks requiring stable fixation
• Hobby projects where precise and repeatable clamping is needed

Key specifications

• Bar length: 400 mm
• Maximum jaw opening/capacity: 120 mm
• Material: steel construction for body and bar
• Clamping mechanism: threaded screw for controlled tightening
• Intended use: workshop and metalworking applications

How to use

Position the clamp so the workpiece sits between the jaws and slide the movable jaw along the bar until it is close to the part. Turn the screw handle to tighten the jaws until the desired clamping pressure is reached; verify that the workpiece is held securely and aligned as required. For larger pieces, adjust the movable jaw position first to reduce screw travel, then finish tightening with the screw mechanism. Release the workpiece by turning the screw handle counterclockwise and sliding the movable jaw away.

Usage recommendations

Use the clamp on clean contact surfaces to maximise grip and avoid damage to the workpiece. Do not exceed the clamp's intended jaw capacity and avoid using excessive force when tightening to prevent thread or component damage. Inspect the screw and bar for wear or deformation before use and store in a dry environment to reduce corrosion.