Value Collection 230-4120 5C Round Steel Collet 5/16 in

Product Description

The VALUE COLLECTION 230-4120 is a 5C round steel collet designed for use in 5C-compatible spindles, lathes, and collet chucks found in machine shop and industrial turning applications. The collet grips round workpieces at a nominal size of 5/16 inch with a total indicator runout (TIR) of 0.0005 inch, making it suitable for precision turning, milling, and grinding operations. The internal thread measures 1.041 inch-24 and the external thread measures 1.242 inch-20, conforming to standard 5C collet geometry. Machinists and toolroom technicians are the primary users of this collet in both production and job-shop environments.

This collet is intended for use in any machine tool equipped with a standard 5C collet system, including manual and CNC lathes, collet chucks, indexing fixtures, and collet blocks. It is suited for holding round bar stock, rod, or finished workpieces during turning, facing, boring, and secondary operations. The 5C collet system is widely used in both light-duty and medium-duty production machining for its speed of workholding changeover and repeatable concentricity.

Key Features

• Nominal collet size of 5/16 inch for round workholding
• Low TIR of 0.0005 inch supports precision concentricity requirements
• Internal thread: 1.041 inch-24 standard 5C specification
• External thread: 1.242 inch-20 standard 5C specification
• Steel construction for durability under repeated clamping cycles

Compatibility

Designed as an OEM-style replacement or standard addition for machine tools equipped with a 5C collet system, including 5C-spindle lathes, collet chucks, collet blocks, and indexing fixtures that accept the standard 5C collet geometry.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Before inserting or removing the collet, ensure the machine spindle is fully stopped and the machine is locked out per applicable shop safety procedures. Inspect the collet taper, threads, and bore for chips or damage before seating. Do not exceed the rated collet bore size, as overloading the collet beyond its nominal capacity can compromise grip and concentricity.