De-sta-co 317-U Hold-down Toggle Clamp 375 Lb

Product Description

The DE-STA-CO 317-U is a manual hold-down toggle clamp designed for vertical clamping applications in production, fabrication, and assembly operations. Built from carbon steel with a zinc finish coating, it delivers a holding capacity of 375 pounds (1,670 N) through a straight, red-handled actuator that travels 60 degrees to lock. The U-bar design with a fixed spindle provides a clear, adjustable hold-down point, while the flanged base allows secure four-point mounting to fixtures, jigs, and workholding surfaces. Licensed machinists, toolmakers, and production technicians are the primary installers of this clamp.

The 317-U is suited for light-to-medium duty clamping in machine shop fixtures, welding jigs, assembly stations, and quality inspection setups. The 185-degree bar opening gives operators wide clearance for part loading and unloading without obstruction. The flanged base mounts to flat surfaces using four holes spaced 0.63 inches (length) by 1 inch (width) on center, making it compatible with standard fixture plate layouts. The package includes two flanged washers, two nuts, and the spindle for a complete ready-to-mount assembly.

Key Features

• 375 lb (1,670 N) holding capacity for reliable workpiece retention
• 60-degree handle travel for fast, low-effort locking and release
• 185-degree U-bar opening for wide part clearance during load and unload
• Fixed spindle with 5/16-18 thread and 1.97 inches of spindle travel for clamping height adjustment
• Four-hole flanged base for rigid, vibration-resistant fixture mounting
• Carbon steel construction with zinc finish coating for durability in shop environments
• Includes flanged washers, nuts, and spindle - no separate hardware required

Compatibility

Designed as an OEM-style replacement or direct-fit addition for standard vertical hold-down toggle clamp applications requiring a flanged base and U-bar configuration with a 375 lb holding capacity.

Installation Notes

Install using four mounting screws through the flanged base holes, sized to the 0.27-inch mounting hole diameter; verify the base is fully flush and fasteners are torqued evenly before applying clamping loads. Adjust the fixed spindle to the required clamping height using the 5/16-18 threaded spindle prior to final mounting. Confirm the clamp locks fully over-center before putting the fixture into production - a clamp that does not reach its over-center position will not hold rated capacity. Follow applicable workplace safety and machinery guarding standards when integrating toggle clamps into automated or semi-automated fixtures.