Wilton MMS-4 4 in Bar Clamp 2 1/4 in Throat Depth

Wilton MMS-4 Bar Clamp for Workshop Use

The Wilton MMS-4 is a 4 in bar clamp built for securing workpieces during gluing, fastening, machining, or assembly tasks. Its extruded steel bar measures 7/16 in wide by 1/4 in thick and provides a maximum jaw opening of 4 in. A 2 1/4 in throat depth allows the jaws to reach further across the workpiece. The steel handle and hex-head swivel mechanism with a V-groove pad suit automotive, metalworking, plumbing, welding, and woodworking applications.

Sustained Clamping Force and Load Rating

The clamp delivers a maximum axial clamping force of 400 lb when fully tightened, and its load capacity is rated at the same 400 lb. This means the tool maintains its rated holding power under continuous load rather than only during initial tightening. The steel bar and swivel jaw design resist deformation so the force remains consistent throughout extended glue-ups or welding setups.

Practical Limits of the Bar Clamp Interface

The 4 in maximum jaw opening defines the widest workpiece the clamp can accommodate, while the 2 1/4 in throat depth limits how far the jaws can reach from the bar edge. Workpieces thicker than 4 in or joints requiring deeper reach will need a different clamp size or style. The 400 lb force ceiling also means heavy structural assemblies that demand higher pressure must use additional or larger clamps.