Bessey STB50M Deep-Reach Screw Clamp 500mm Clamping Width 175mm Throat Depth

When clamping workpieces with deep recesses or wide panels, standard clamps often fall short. The Bessey STB50M deep-reach screw clamp solves this by combining a 500 mm clamping width with a 175 mm throat depth, allowing you to reach far into the workpiece while applying up to 5,500 N of force. Its tempered steel rail and malleable cast iron jaws deliver the rigidity needed for demanding woodworking and metalworking tasks.

Who is it for

Professional carpenters, cabinet makers, metalworkers, and serious DIY enthusiasts who need a reliable deep-throat clamp for assembling large frames, gluing up panels, or holding awkward workpieces securely. If your projects involve wide boards or deep profiles, this clamp provides the reach and power to get the job done right.

Main features

• Deep reach: 175 mm throat depth for clamping far from the edge.
• High clamping force: up to 5,500 N for secure, vibration-resistant holding.
• Durable construction: tempered steel rail with optimized profile for stability; fixed jaw and sliding arm made of malleable cast iron.
• Precision spindle: 16 mm diameter with trapezoidal thread and galvanized corrosion protection.
• Comfortable handling: wooden handle for a firm, ergonomic grip.
• Swiveling pressure plate: adapts to angled or uneven surfaces to prevent workpiece damage.

Specifications

• Brand: Bessey
• Model: STB50M
• MPN: STB50M
• EAN: 4008158007625
• Product type: Deep-reach screw clamp
• Max. clamping width: 500 mm
• Throat depth: 175 mm
• Max. clamping force: 5500 N
• Rail dimensions (W x T): 25 x 12 mm
• Spindle diameter: 16 mm
• Material (rail): Tempered steel
• Material (fixed jaw & sliding arm): Malleable cast iron
• Handle material: Wood
• Pressure plate type: Swiveling
• Thread type: Trapezoidal thread
• Corrosion protection (spindle): Galvanized
• Application: Woodworking, metalworking, assembly

Tips

To maximize the life of your clamp, keep the rail and spindle clean and lightly oiled. For angled workpieces, the swiveling pressure plate ensures even pressure distribution without marring the surface. Always ensure the clamp is properly seated before applying full force.