Piston Ring Expanders | McMaster-Carr

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13 Products

Piston Ring Installation Tools

Reduce the risk of distorting and breaking piston rings during installation and removal.

For Ring OD		Each
1 1/8" to 2 1/4"	0000000	000000
2 1/8" to 3 7/8"	0000000	00000
4 1/4" to 6 1/4"	0000000	00000

Easy-Adjust Piston Ring Compressors

These compressors use either a spring clutch or two screws to make incremental sizing adjustments for a secure fit. Use them to ensure smooth insertion of your piston into a cylinder.

For Ring OD	Overall Ht.	Each
1 1/2" to 3"	2"	000000
2 1/8" to 5"	3 1/2"	00000
3 1/2" to 7"	3 1/2"	00000
3 1/2" to 7"	7"	00000
7" to 10"	7"	00000

Rod Seal Installation Tools

Install flexible seals, wipers, and O-rings. These tools are not for use with rigid materials, such as PTFE and nylon.

For Seal ID	Min. Opening Req.	Each
1" to 1 1/2"	1"	000000
1 1/2" to 2"	1 1/2"	00000
2" to 3"	2"	00000

Low-Friction Piston Ring Compressors

Also known as a wrinkle-band compressor, this tool has fewer points of contact than other compressors for less friction. Use it to ensure smooth insertion of your piston into a cylinder. This compressor has a cam lock that holds the size once you set it.

For Ring OD	Overall Ht.		Each
3" to 5"	1 1/2"	0000000	000000

Quick-Release Piston Ring Compressors

Push the lever and this compressor instantly releases for easy removal. Use it to ensure smooth insertion of your piston into a cylinder.

For Ring OD	Overall Ht.		Each
2 1/8" to 5"	1 1/2"	000000	000000