Mitee-bite 31350 Id Expansion Clamp Mild Steel

Product Description

The MITEE-BITE 31350 is a mild steel internal-diameter (ID) expansion clamp designed to grip workpieces from the inside bore for secure fixturing during machining operations. It expands from 1.15 inches to 2.03 inches to accommodate a range of bore sizes, delivering a rated holding force of 10,000 pounds. The 5/8-11 center screw drives the expansion mechanism, while three 10-32 mounting screws anchor the flange to the fixture plate or tooling body. Machinists and toolroom professionals install this clamp in CNC machining centers, milling fixtures, and turning setups where outside-diameter clamping is impractical or would damage finished surfaces.

The 31350 is suited for production and prototype machining environments where repeatable, concentric workholding is required. Its 2.972-inch flange diameter and 2.515-inch mount hole diameter allow straightforward integration into standard fixture plates. The clamp is appropriate for both horizontal and vertical machining orientations where the bore of the part can be used as the primary datum. This style of ID expansion clamp is commonly used in aerospace, automotive, and general precision machining shops.

Key Features

• Expansion range of 1.15 inches to 2.03 inches covers a wide bore diameter span in a single clamp
• 10,000 lb holding force provides rigid, vibration-resistant workholding
• 5/8-11 center screw thread delivers high actuation torque capacity rated at 224 ft/lb
• Three-hole flange mount with 10-32 mounting screws for stable, balanced seating on fixture plates
• Mild steel construction balances strength and machinability for toolroom use
• Compact overall height of 1.56 inches minimizes interference with toolpaths and workpiece clearance

Compatibility

Designed as an OEM-style workholding component for use with standard fixture plates and tooling bodies that accept a 2.515-inch mount hole pattern with three 10-32 mounting screw positions.

Installation Notes

Installation is performed by toolroom machinists or fixture builders. Ensure the fixture plate or tooling body is clean and flat before mounting the flange to maintain accurate seating. Tighten mounting screws in a star pattern to achieve even clamping force across all three mount holes before actuating the center screw. Always verify the workpiece bore is within the 1.15-inch to 2.03-inch expansion range before applying clamping force, and do not exceed the rated center screw torque specification.