Value Collection 230-4440 5C Expanding Collet

Product Description

The VALUE COLLECTION 230-4440 is a 5C expanding collet machined from steel for use in 5C-compatible spindles and collet chucks on lathes and collet fixtures. Expanding collets grip the internal bore of a workpiece rather than clamping an outside diameter, making them the right tool when a part must be held from the inside for turning, grinding, or inspection operations. The collet features a 3-inch head diameter, a 2.5-inch head length, and a concentricity rating of 0.0020 inch TIR, providing consistent, repeatable workholding for precision machining work. Licensed machinists and toolroom technicians are the primary installers and users of this component.

This expanding collet is suited for machine shop and toolroom environments where internal gripping of bored or tubular workpieces is required. It accommodates a grip range from 0.75 inch minimum to 2.9375 inches maximum, covering a wide span of bore diameters in a single collet. The internal thread size is 1.041 inch-24 and the external thread size is 1.242 inch-20, allowing it to seat correctly in standard 5C collet closers and fixtures. It is appropriate for production turning, OD grinding setups, and inspection fixturing where a low runout, inside-diameter reference is needed.

Key Features

• Expanding collet design grips workpiece internal bores rather than outside diameters
• 0.0020 inch TIR concentricity for repeatable, low-runout workholding
• Grip range from 0.75 inch to 2.9375 inches covers a broad range of bore sizes
• Steel construction for durability under production machining conditions
• Internal thread 1.041 inch-24 and external thread 1.242 inch-20 for standard 5C system fit
• 3-inch head diameter with 2.5-inch head length

Compatibility

Designed for use in standard 5C collet spindles, collet chucks, and collet fixtures that accept expanding-style 5C collets with 1.242 inch-20 external thread engagement.

Installation Notes

Installation and adjustment of 5C expanding collets should be performed by a qualified machinist familiar with collet closer operation and workholding setup. Ensure the spindle or collet fixture is fully stopped and locked out before seating or removing the collet. Inspect collet threads and the mating closer threads for damage or contamination before installation, and clean mating surfaces. Do not exceed the stated maximum grip diameter, as overloading an expanding collet can cause it to crack or deform and can damage the workpiece or spindle.