Chuck Stops | McMaster-Carr

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10 Products

Lathe Chuck Stops

Fixed Lathe Chuck Stop

Shown Installed


Fixed	Adjustable	Adjustable with Hardened Steel Parallels

Consistently position workpieces in a three-jaw lathe chuck. These stops enable short workpieces to extend beyond the chuck's jaws, providing additional clearance. A magnetic back makes them easy to mount and remove from your chuck face.

Fixed—Fixed chuck stops are a simple, consistent way to position your piece.

Adjustable—Adjustable chuck stops can be used with parallels or your own custom supports to position workpieces at the exact depth you need. Those that include hardened steel parallels come ready to set at various depths.

	Thicknesses Included	For Max. Chuck Jaw Thk.	Parallel Tolerance	Mount Type	No. of Mounting Magnets	Includes	Material		Each
Fixed



	3	15 mm, 20 mm, 25 mm	2 1/8"	-0.0004", 0.0004"	Magnetic Back	3	—	Aluminum	0000000	0000000


	5	15 mm, 20 mm, 25 mm, 30 mm, 35 mm	2 1/8"	-0.0004", 0.0004"	Magnetic Back	3	—	Aluminum	00000000	000000


	Adjustable



			6	7/16"	—	-0.0002", 0.0002"	Magnetic Back	3	Five plastic centering rings (1 3/8" to 4" diameter)	Metal	00000000	00000


			17	7/16"	—	-0.0002", 0.0002"	Magnetic Back	3	Six plastic centering rings (1 3/8" to 4" diameter), Ten sets of hardened steel parallels (1/2" to 1 5/18" height) in a plastic case	Metal	00000000	000000

Lathe Spindle Stops

Position workpieces in the same spot every time to quicken setup, improve repeatability, and cut down on scrap. These stops create a repeatable position within your lathe spindle for clamping parts loaded through a chuck or collet. They fit a range of spindle bore diameters—the jaws expand outward for a secure, self-centering fit. To lock these stops in place, expand them with just a few turns of the T-handle wrench. They can be used on both CNC and manual lathes.

For Spindle Dia.	Overall Lg.	Includes	Material	Each
1 5/16" to 1 11/16"	31" to 34 1/2"	Collet Stop Adapter, Tube Stop Adapter, Long Extension Bar, Short Extension Bar, T-Handle Socket Wrench	Black-Oxide Alloy Steel	0000000
1 3/4" to 2 7/16"	37 1/4" to 43 3/4"	Collet Stop Adapter, Tube Stop Adapter, Long Extension Bar, Short Extension Bar, T-Handle Socket Wrench	Black-Oxide Alloy Steel	000000
2 1/2" to 3 1/2"	40" to 46 1/2"	Collet Stop Adapter, Tube Stop Adapter, Long Extension Bar, Short Extension Bar, T-Handle Socket Wrench	Black-Oxide Alloy Steel	000000

Adjustable Lathe Collet Stops


Lathe Collet Stop with Spring Plunger Rod	Lathe Collet Stop

Ensure parts don't push back into the collet while machining. To install, insert the stop into the back of your collet and tighten the nut with the included wrench. Then adjust the rod inside the sleeve to the appropriate depth and tighten the set screw. Use with 5C collets that have internal threads.

For Collet Size	Rod Material	Sleeve Material	Includes		Each
3/64" to 63/64"	Aluminum	Plastic	Adjustable Rod with Set Screw, Wrench	0000000	000000
1" to 1 1/16"	Aluminum	Plastic	Adjustable Rod with Set Screw, Wrench	0000000	00000