Mitee-bite 31250 Id Expansion Clamp Mild Steel 5900 Lb

Product Description

The MITEE-BITE 31250 is a mild steel internal diameter (ID) expansion clamp designed to grip workpieces from the inside bore outward, delivering 5,900 pounds of holding force at 120 foot-pounds of center screw torque. The expansion diameter range spans 0.9 to 1.39 inches, making it suitable for a variety of bore sizes within that window. A 1/2-13 center screw drives the expansion mechanism, while three 8-32 mounting screws secure the clamp body to a fixture plate or tombstone. Machinists and fixture builders install this clamp where external clamping is impractical or where full top-surface access to the workpiece is required.

This clamp is intended for workholding applications in CNC machining, milling, and fixturing environments where a clean, unobstructed work surface is essential. The three-point mounting pattern distributes clamping loads evenly across the flange, and an optional recessed dowel pin can be installed into the flange for additional rigidity and repeatability during high-volume production runs. It is well suited to fixture plates, tooling plates, and custom jig assemblies in job shop and production machining settings.

Key Features

• Expansion diameter range of 0.9 to 1.39 inches accommodates a range of bore sizes in a single clamp body
• 5,900 pounds of holding force provides secure grip for demanding milling and machining operations
• Mild steel construction balances strength and machinability for general-purpose fixturing
• 1/2-13 center screw thread for straightforward torque application with standard tooling
• Three-hole flange mounting pattern with 8-32 mounting screws for stable, low-profile installation
• Compatible with optional recessed dowel pin installation for improved repeatability and rigidity

Compatibility

Designed as an OEM-style workholding component for use with fixture plates, tooling plates, and custom jig assemblies where the bore diameter falls within the 0.9 to 1.39 inch expansion range.

Installation Notes

Installation is performed by qualified fixture builders or machinists. Power down and de-energize any associated machine tool before installing or adjusting the clamp. Secure the three 8-32 mounting screws evenly before applying final torque to the 1/2-13 center screw. For additional positional repeatability, install a recessed dowel pin into the flange as noted in the product specifications.