3.1″ 4-Jaw Independent Chuck – 3/4-16 Thread


Includes hex key, not pictured

SKU: 1030 Category:

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 be used to 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. A clamping groove allows the chuck to hold parts for milling.

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 1030-1032-1044 Instructions

Instructions PDF Download

Chuck Diameter 3.1″
Jaw Capacity With jaws in normal position: 3/32″ (2mm) – 1-1/2″ (38mm)

With jaws in reverse position: 5/16″ (8mm) – 2-3/4″ (70mm)

Through Hole Diameter .687″ (17mm)
Thread Size 3/4-16 (other sizes available in 2.5″ diameter)
Chuck Body Material 12L14 Steel
Chuck Jaws Material 12L14 Case Hardened Steel
Part No. Description Quantity
10301 3.1″ 4-Jaw Independent Chuck Body 3/4-16 Thread *Not sold separately 1
11451 4-Jaw Independent Chuck Jaw* 4
11460 4-Jaw Independent Chuck Screws (Set of 4) 1
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.

Click the P/Ns below to download a zipped version of the IGS 3D CAD file. You will need to extract the zip file before viewing the IGS file.
1030 4-Jaw Independent Chuck 3D IGS model
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