Clamp G‑type Irwin T1204 4"/100mm — universal woodworking and metalworking clamp

The Irwin G-type clamp T1204 4"/100mm is a universal woodworking and metalworking clamp designed for holding parts securely during glue-ups, assembly, cutting, drilling and light welding tasks. It combines a fixed steel bar, an adjustable sliding jaw and a threaded screw mechanism to provide controlled, stable clamping pressure across a 100 mm throat depth. The clamp is intended for workshop and DIY environments where a reliable, compact fastening tool is required.

Advantages

This clamp offers a solid fixed bar construction that resists bending under moderate loads and an adjustable sliding jaw that allows quick positioning along the bar. The screw mechanism gives precise control of clamping force, reducing the risk of over-tightening delicate workpieces. Its 4" (100 mm) throat capacity provides access to workpieces without excessive bulk, and the overall design supports both woodworking and light metalworking applications.

Suitable for

• Wood glue-ups and panel assembly
• Holding parts during sawing, routing or drilling
• Light welding set-up and tack-holding metal parts
• General workshop tasks and fixtures for hobby projects

When it may not be suitable

The T1204 clamp is intended for moderate clamping demands. It may not be suitable for heavy-duty industrial applications that require very high clamping forces or very long throat depths. For large-scale timber work, heavy metal fabrication, or situations requiring multiple clamps with extremely high force ratings, a larger or specialized clamp should be considered.

Key specifications

• Throat capacity: 4" (100 mm)
• Bar type: fixed steel bar
• Adjustable sliding jaw for quick positioning
• Threaded screw for controlled clamping pressure
• Intended use: woodworking and light metalworking

How to use

Position the fixed bar so the workpiece sits between the fixed jaw and the adjustable sliding jaw. Slide the adjustable jaw to approximate position, then turn the screw handle clockwise to apply clamping pressure until the workpiece is held securely. To release, turn the screw handle counterclockwise and slide the adjustable jaw away from the workpiece. Use protective pads or scrap wood between the clamp jaws and finished surfaces to avoid marring. Ensure the clamp is seated squarely and pressure is distributed evenly when securing assemblies or glued joints.

What to consider before purchase

• Required throat depth for your typical projects (100 mm maximum)
• Maximum clamping force needed for your materials and tasks
• Compatibility with the sizes and shapes of parts you usually work on
• Whether you need multiple clamps or a larger model for heavier work

Usage recommendations

For reliable results, use the clamp to apply steady, even pressure and protect delicate surfaces with pads. Inspect the screw mechanism periodically for smooth operation and keep the bar clean of debris to ensure accurate jaw positioning.