Accupro 777770 Milling Chuck Collet 0.375 Id 1.25 Od

Product Description

The ACCUPRO 777770 is a milling chuck collet designed to securely hold cutting tools in milling chuck toolholders. With an inside diameter of 0.375 inches and an outside diameter of 1.25 inches, this collet provides a precise, rigid grip on straight-shank end mills and similar rotary cutting tools. The overall length of 2.88 inches suits standard milling chuck body depths found in CNC and manual milling setups. Machinists and tool crib technicians working in job shops, production facilities, and maintenance environments will find this collet suited for light-to-medium milling operations where accurate tool runout control is required.

This collet fits applications where a 0.375-inch shank tool must be held in a milling chuck toolholder using a standard 1.25-inch OD collet seat. Typical use cases include CNC machining centers, knee mills, and manual vertical mills running end mills, slot drills, or other straight-shank cutters. No through-coolant feature is present, making it appropriate for dry or flood-coolant setups where coolant delivery through the spindle is not required.

Key Features

• 0.375-inch inside diameter for standard 3/8-inch shank cutting tools
• 1.25-inch outside diameter seats securely in compatible milling chuck bodies
• 2.88-inch overall length matches standard milling chuck collet pocket depths
• No through-coolant bore - suited for external flood or dry cutting applications
• Compact, single-piece collet construction for repeatable tool seating

Compatibility

Designed as an OEM-style replacement or standard fitment collet for milling chuck toolholders accepting a 1.25-inch OD collet with a 0.375-inch bore.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Ensure the spindle is fully stopped and the machine is in a locked-out, tagged-out state before changing collets. Clean the collet bore and chuck body seat thoroughly before seating the collet to prevent runout caused by chips or debris. Do not exceed the toolholder manufacturer's specified clamping torque for the retention nut.