2.5″ 4-Jaw Independent Chucks – Various Thread


Includes hex key, not pictured

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Product Description

These chucks have four advantages over 3-jaw chucks.

  1. They can be used to hold irregularly shaped parts
  2. They can be used to center parts with a great deal of accuracy
  3. 4-jaw chucks can be used to deliberately hold a part off-center
  4. They can clamp stock tighter

This is a valuable asset when machining cams, crankshafts, and similar parts. The main disadvantage of the 4-jaw independent chuck is that the jaws must be set individually, adding considerable setup time. The jaws are reversible to accommodate larger stock.

NOTE: The independent chucks don’t have Tommy bar holes like the scroll chucks because most people use the 5/32″ hex wrench into one of the jaw screws to thread the chuck on and off. Our P/N 3020 5/32″ Hex T-Driver works perfectly.

Like the Sherline 3-jaw chucks, the 4-jaw chucks can clamp either externally or internally. Although we recommend the 3-jaw chuck for standard lathe projects, the 4-jaw chuck is considered the accessory that could add the most versatility to your machine. If you feel the 4-jaw chuck would be more useful, and you have no need for the 3-jaw chuck, any lathe “A” package can be ordered with the 4-jaw chuck substituted for the 3-jaw upon request. A clamping groove allows the chuck to hold parts for milling.

Chucks for Sherline and Other Lathes

The chuck is available in several spindle threads for use on Sherline (3/4-16) and other machines, such as old Unimat lathes (12 mm x 1 mm and 14 mm x 1 mm)  or Sears 6″ lathes (1/2-20).
*Please note that chucks with a thread size other than 3/4″ x 16 are made to order and have a lead time of 5-7 business days.

Jaw Options

  • For those who have jobs where speed and ease of use are more important than maximum accuracy and want a chuck that is loose right from the start (No extra charge).
    Add the note “loose jaws” to the comments box above
  • Soft (not hardened or machined) steel jaws are also available when you build your own chuck.

The improper use of machine tools and their accessories can result in serious injury. Before using this tool, thoroughly read the instructions and make sure you understand its proper and safe use.


Always wear safety glasses when operating machine tools.

Download PDF Instructions

Instructions PDF Download

Chuck Diameter 2.5″
Jaw Capacity With jaws in normal position: 3/32″ (2mm) – 1-3/16″ (30mm)
With jaws in reverse position: 5/16″ (8mm) – 2-1/4″ (56mm)
Through Hole Diameter .687″ (17mm)
Thread Size P/N 1044 – 3/4-16 (Sherline)
P/N 1071 – 12mm x 1mm (Unimat SL 1000)
P/N 1073 – 1/2-20 (Old Sears 6″ Lathes)
P/N 1035 – 14mm x 1mm (Unimat 3 or Cowells)
Chuck Body Material 12L14 Steel
Chuck Jaws Material 12L14 Case Hardened Steel
Part No. Description Quantity
2.5″ 4 Jaw Independent Chuck Body 3/4-16 Thread *Not sold separately
2.5″ 4 Jaw Independent Chuck Body 12mm x 1mm Thread *Not sold separately
2.5″ 4 Jaw Independent Chuck Body 1/2-20 Thread *Not sold separately
2.5″ 4 Jaw Independent Chuck Body 14mm x 1mm Thread *Not sold separately
11451 4 Jaw Independent Chuck Jaw* 4
11460 4 Jaw Independent Chuck Screw 4
40550 5/32″ Hex Key 1

*Because chuck master jaws are factory ground to precisely match each chuck body you must send your chuck back to us to be fitted with new master jaws. Please contact us for instructions on how to return your chuck.