Diameter 3-Jaw Self-centering Chucks...
larger chuck takes up no more center-to-center space than the 2.5" chuck,
but it will hold larger work. It has a clamping range of from 3/32" (2 mm)
up to 1-1/2" (38 mm) diameter with the jaws in the normal position. With
the jaws in the reversed position, work up to 2-3/4" (70 mm) can be
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. The chuck has a 3/4-16 thread to fit Sherline's
spindle and other machines using that thread.
Nickel Boron Coated
3-Jaw Self-centering Chuck (P/N
This chuck is identical to P/N 1040 except for an electroless nickel boron coating that has been applied to help prevent wear and corrosion.
This special coating has been applied to all external and internal surfaces of
the chuck (except for chuck jaws), significantly improving the life of the chuck.
This chuck also opens and closes more
smoothly due to the lubrication properties of nickel boron. Other benefits and features of the electroless nickel boron coating
include the following:
Ductile plating with columnar structure
than any other nickel-based coating
Coating uniformity that eliminates post-plate grinding (or burnishing)
properties overall superior to hard chromium
Hardness (68-72 Rc)
coefficient of friction (.044) Teflon™ is .04
coating thickness up to .004”
Accepts dry film lubricants
on Scrolling Chucks...
Sherline technicians custom grind
each jaw to fit its own slot with as little play as possible. Grinding is done
to within .0001". This assures maximum accuracy. If you have sent in an old chuck
for jaw replacement or are replacing an old, worn chuck, you will notice that
the new one is initially harder to turn than your worn one. As chucks wear, they
become looser and easier to turn. Some users like a chuck that turns easily
right from the start for quick part changes, where maximum accuracy is not as
important as speed and ease of use. In your preference, Sherline makes and sets
aside a certain number of chucks with less tightly fit jaws. If your job calls
for repetitive, quick part changes and you can accept a little less centering