2.5″ 3-Jaw Chucks – Various Thread


Includes 2 tommy bars, not pictured

Clear selection
    Reset options

Product Description

Three-jaw chucks are designed so that all three jaws move together and automatically center round or hexagonal parts or stock to within a few thousandths of an inch. These chucks provide the quickest and easiest way of holding work in the lathe. For this reason, they are the most popular of the Sherline accessories. The Sherline 3-jaw chucks are designed so that they can be used to clamp externally on bar stock or internally on tube stock. The jaws are reversible to accommodate larger stock.

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 (12mm x 1mm and 14mm x 1mm) 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 1040 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: 1/4″ (6mm) – 2-1/4″ (56mm)

Through Hole Diameter .687″ (17mm)
Thread Size P/N 1041 – 3/4-16 (Sherline)
P/N 1068 – 12mm x 1mm (Unimat SL 1000)
P/N 1070 – 1/2-20 (Old Sears 6″ Lathes)
P/N 1031 – 14mm x 1mm (Unimat 3 or Cowells)
Chuck Body Material 12L14 Steel
Chuck Jaws Material 12L14 Case Hardened Steel
I.D. Holding diameter of jaws
NOTE: The diameters shown on the print can vary as much as .010-.020 depending on the amount of material that is removed during the grinding operation.
Click on the image for a larger view.
Part No. Description Quantity
2.5″ 3 Jaw Chuck Body 3/4-16 Thread *Not sold separately
2.5″ 3 Jaw Chuck Body 12mm x 1mm Thread *Not sold separately
2.5″ 3 Jaw Chuck Body 1/2-20 Thread *Not sold separately
2.5″ 3 Jaw Chuck Body 14mm x 1mm Thread *Not sold separately
10412 2.5″ Chuck Scroll *Not sold separately 1
10413 Chuck Retainer Ring 1
10414 3 Jaw Chuck Jaw* 3
40580 Tommy Bar 2

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

Click the P/N 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.
1041 2.5″ 3-Jaw Chuck, 3/4-16 thread 3D IGS model
1031 2.5″ 3-Jaw Chuck, 14 mm x 1 mm thread 3D IGS model
1068 2.5″ 3-Jaw Chuck, 12 mm x 1 mm thread 3D IGS model
1070 2.5″ 3-Jaw Chuck, 1/2-20 thread 3D IGS model
You need an IGS viewer to view .igs files. CLICK HERE to download a FREE IGS viewer.