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

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.