Value Collection 1230-4239 5C Round Collet 21mm

Product Description

The VALUE COLLECTION 1230-4239 is a 5C round collet machined from steel for use in 5C-compatible spindles and collet chucks. It features a 21.00 mm collet size, a total indicator runout (TIR) of 0.015 mm for consistent concentricity, and standard 5C threading dimensions. This collet is designed to grip round workpieces securely during turning, milling, or grinding operations. Machinists and tool room technicians install this type of collet in manual or CNC lathes, indexers, and collet closers where repeatable, accurate workholding is required.

This 5C round collet is suited for shop environments running 5C-compatible workholding equipment. Typical applications include production turning on engine lathes, part holding in rotary indexers, and secondary operations on screw machine parts. The steel construction provides durability under repeated clamping cycles. It is appropriate for both job shop and production settings where round stock or pre-turned blanks require secure, repeatable fixturing.

Key Features

• 21.00 mm collet size for round workpiece gripping
• TIR of 0.015 mm for accurate concentricity
• Internal thread size: 1.041 inches-24
• External thread size: 1.242 inches-20
• Steel construction for wear resistance and durability
• Standard 5C form factor compatible with 5C spindles and closers

Compatibility

Designed as an OEM-style replacement or direct-fit collet for 5C-compatible spindles, collet chucks, collet closers, and rotary indexers accepting the standard 5C collet form factor.

Installation Notes

Installation is performed by qualified machinists or tool room personnel. Ensure the spindle or collet closer is fully powered down and de-energized before inserting or removing the collet. Clean the collet seat and collet body of chips and debris before installation to protect TIR performance. Inspect threads on both the collet and the closer or chuck for damage before tightening.