Value Collection 1230-4221 5C Round Collet 12.00mm

Product Description

The VALUE COLLECTION 1230-4221 is a 5C round collet machined from steel, designed for workholding applications on lathes, collet chucks, and rotary indexing fixtures equipped with the 5C spindle standard. The collet accepts a 12.00mm round workpiece and holds a total indicated runout (TIR) of 0.015mm, making it suitable for precision turning, grinding, and secondary operations where concentricity matters. The internal thread measures 1.041 inches at 24 threads per inch, and the external thread measures 1.242 inches at 20 threads per inch. Machinists and tool-and-die technicians are the primary installers of this type of workholding device.

This collet is used in production and job-shop environments where 5C-compatible spindles are standard equipment. Typical applications include CNC lathes, manual engine lathes, bench-top collet closers, and 5C indexing heads used for milling operations. The round geometry is the most common 5C collet profile and is appropriate for gripping cylindrical bar stock, turned blanks, and round-shank tooling up to the rated collet bore size.

Key Features

• 5C round collet profile fits standard 5C-compatible spindles and collet closers
• 12.00mm collet bore size for gripping round workpieces
• TIR of 0.015mm for repeatable concentricity in precision turning and grinding setups
• Steel construction for durability under production workholding loads
• Internal thread: 1.041 inches at 24 threads per inch
• External thread: 1.242 inches at 20 threads per inch

Compatibility

Designed as an OEM-style replacement and standard fitment for machine spindles, collet chucks, and indexing fixtures built to the 5C collet standard.

Installation Notes

5C collets are installed and removed by machinists using the appropriate collet closer or draw tube for the host machine spindle. Always disengage the machine and confirm the spindle is fully stopped before inserting or removing the collet. Inspect the collet bore and spindle taper for chips or burrs before seating, as contamination directly affects runout. Do not exceed the rated bore capacity of the collet, as overloading the collet body can cause cracking or loss of grip.