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2.5
2.5" 3-Jaw Chucks

Product #: 1031/1041/1068/1070

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Comments or Special Instructions
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This compact chuck is a good all-around workhorse for most lathe work. It has a clamping range of from 3/32" (2 mm) up to 1-3/16" (30 mm) diameter with the jaws in the normal position. With the jaws in the reversed position, work up to 2-1/4" (56 mm) can be gripped. The hole through the chuck is .687" (17 mm). Rotating the knurled ring closes all three jaws simultaneously to quickly grip round or hexagonal stock. Tommy bars (provided) are used in the holes in the side to tighten and loosen the chuck for more leverage. 

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/special instructions” box.
  • Soft (unhardened) steel jaws are also available upon request (No extra charge). They are not stepped so they can be machined by the customer for custom holding applications. Because of this the jaws tolerances are not held to the same standard as our standard chuck jaws.
    Add the note “soft jaws” to the “comments/special instructions” box.
  • Interchangeable top jaws are also available.

Specifications

  • Chuck Diameter2.5″
  • 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 Size3/4-16 (other thread sizes available)
  • Chuck Body Material12L14 Steel
  • Chuck Jaws Material12L14 Case Hardened Steel

Removing a Stuck Chuck from the Spindle

 

Use one tommy bar in the hole in the spindle and another tommy bar in a hole in the chuck body to achieve enough leverage to unscrew the chuck (counter-clockwise) from the spindle thread. If the chuck becomes stuck on the spindle thread, put a tommy bar in the hole in the chuck body. Place a block of wood against the tommy bar where it enters the chuck. With a small mallet, give the block of wood a sharp tap, turning the chuck in a counter-clockwise direction. It should not be necessary to hold the spindle, as its inertia should be sufficient. (Don’t hit the tommy bar anywhere other than right where it enters the chuck or you could bend it.) This small but sharp force at the outer edge of the chuck should break the thread loose and the chuck can then be unscrewed by hand.

Replacement parts 

40580 - Spindle Bar
Because chuck jaws are facotry ground to precisely match each chuck body, replacement jaws cannot be bought either individually or as a set. If you need to replace the jaws you can give us a call or send us a message to set up returning your chuck for installation of new jaws. 

Download PDF 1040 Instructions

Instructions PDF Download




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