Ring Compressors | McMaster-Carr

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37 Products

About Air Compressors

About Cylinder Seals

Rod wipers scrape dirt, dust, and moisture from the rod, preventing contamination inside your cylinder.

Rod seals maintain the pressure inside cylinders and prevent fluid from leaking out.

Wear rings guide the rod and piston to prevent uneven wear and optimize seal performance.

Head seals are a more reliable alternative to the standard O-ring/backup ring combination—they resist twisting and remain stable even in applications with fluctuating pressure.

Buffering seals protect hydraulic cylinders from pressure spikes and shock in high-pressure hydraulic applications.

Cushioning seals minimize wear and noise in air-powered cylinders by preventing the piston from slamming against the cylinder body.

Piston seals make a seal between their outside edge and the cylinder bore to prevent internal leaks.

Easy-to-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"-3"	2"	000000	000000
2 1/8"-5"	3 1/2"	000000	00000
3 1/2"-7"	3 1/2"	000000	00000
3 1/2"-7"	7"	000000	00000
7"-10"	7"	000000	00000

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"-5"	1 1/2"	000000	000000

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"-5"	1 1/2"	0000000	000000

High-Flow Low-Pressure Compressed Air Blowers

Also known as regenerative blowers, use these to produce high-flow compressed air with low pressure or vacuum to operate pump drives, lift tables, and conveying systems. Compressed air blowers are also used for drying, exhausting, and aeration.

Air circulates inside the blower housing to compress air, which generates pressure or vacuum. Single-stage blowers circulate air once and then exhaust. Two-stage blowers circulate air twice and then exhaust, creating higher pressure or vacuum than single-stage blowers with the same horsepower.

Inverter-rated blowers have a motor that can run at slow speeds without overheating, so they can be used with a motor speed control (variable frequency drive).

For technical drawings and 3-D models, click on a part number.

Single Stage

Single Stage Blower

Blowers
						Overall				Pipe Size				Air-Intake Filters		Relief Valves
Maximum Pressure	Max. Flow Rate @ psi	Vacuum Rating	hp	Full Load Current	Vol., dBA	Lg.	Wd.	Ht.	Temp. Range, ° F	Inlet	Outlet		Each		Each		Each
Single Phase, 120/208/230V AC
NPT Female Inlet and Outlet
1 psi 29 in. of H₂O	27 cfm @ 0	1.9 in. of Hg 27 in. of H₂O	1/8	2.3 A @ 115 V AC 1.2 A @ 208 V AC 1.2 A @ 230 V AC	57	9"	8"	9"	32° to 100°	1	1	0000000	0000000	00000000	0000000	00000000	0000000
1 psi 39 in. of H₂O	42 cfm @ 0	2.6 in. of Hg 35 in. of H₂O	1/3	3.8 A @ 115 V AC 2.0 A @ 208 V AC 1.9 A @ 230 V AC	63	10"	9"	9"	32° to 100°	1	1	0000000	00000000	00000000	000000	00000000	000000
2 psi 42 in. of H₂O	52 cfm @ 0	3.0 in of Hg 40 in. of H₂O	1/2	6.0 A @ 115 V AC 3.2 A @ 208 V AC 3.0 A @ 230 V AC	68	13"	10"	10"	32° to 100°	1 1/4	1 1/4	0000000	00000000	00000000	000000	00000000	000000
2 psi 52 in. of H₂O	92 cfm @ 0	3.5 in. of Hg 48 in. of H₂O	1	9.8 A @ 115 V AC 5.2 A @ 208 V AC 4.9 A @ 230 V AC	68	13"	11"	12"	32° to 100°	1 1/2	1 1/2	0000000	00000000	00000000	000000	00000000	000000
2 psi 65 in. of H₂O	127 cfm @ 0	4.4 in. of Hg 60 in. of H₂O	1 1/2	17.5 A @ 115 V AC 10.0 A @ 208 V AC 9.0 A @ 230 V AC	74	16"	13"	14"	32° to 100°	1 1/2	1 1/2	0000000	00000000	00000000	000000	00000000	000000
Single Phase, 120/230V AC
BSPP Female Inlet and Outlet
2 psi 56 in. of H₂O	57 cfm @ 0	3.8 in. of Hg 52 in. of H₂O	1/2	6.0 A @ 115 V AC 3.0 A @ 230 V AC	56	10"	10"	10"	5° to 100°	1 1/4	1 1/4	0000000	00000000	000000	00	000000	00
3 psi 76 in. of H₂O	102 cfm @ 0	5.3 in. of Hg 72 in. of H₂O	1 1/2	14.0 A @ 115 V AC 7.0 A @ 230 V AC	64	12"	11"	12"	5° to 100°	1 1/2	1 1/2	0000000	00000000	000000	00	000000	00
NPT Female Inlet and Outlet
3 psi 72 in. of H₂O	148 cfm @ 0	5.3 in. of Hg 72 in. of H₂O	2 1/4	24.0 A @ 115 V AC 12.0 A @ 230 V AC	70	14"	13"	13"	5° to 100°	2	2	0000000	00000000	000000	00	000000	00
Three Phase, 190/230/380/460V AC (Inverter Rated)
NPT Female Inlet and Outlet
2 psi 56 in. of H₂O	103 cfm @ 0	4.1 in. of Hg 56 in. of H₂O	1	4.4 A @ 190 V AC 3.7 A @ 230 V AC 2.2 A @ 380 V AC 2.1 A @ 460 V AC	64	11"	11"	12"	32° to 100°	1 1/2	1 1/2	0000000	00000000	000000	00	000000	00
3 psi 79 in. of H₂O	150 cfm @ 0	6.5 in. of Hg 88 in. of H₂O	2 3/4	7.5 A @ 190 V AC 7.3 A @ 230 V AC 4.3 A @ 380 V AC 4.4 A @ 460 V AC	70	14"	13"	15"	32° to 100°	2	2	0000000	00000000	000000	00	000000	00
3 psi 92 in. of H₂O	221 cfm @ 0	7.1 in. of Hg 96 in. of H₂O	4 1/2	12.5 A @ 190 V AC 12.6 A @ 230 V AC 7.2 A @ 380 V AC 7.3 A @ 460 V AC	72	15"	15"	17"	32° to 100°	2	2	0000000	00000000	000000	00	000000	00
4 psi 116 in. of H₂O	150 cfm @ 0	7.7 in. of Hg 104 in. of H₂O	3 1/4	9.7 A @ 190 V AC 10.3 A @ 230 V AC 5.6 A @ 380 V AC 6.0 A @ 460 V AC	70	14"	13"	15"	32° to 100°	2	2	0000000	00000000	000000	00	000000	00
Three Phase, 208/230/460V AC
NPT Female Inlet and Outlet
2 psi 43 in. of H₂O	53 cfm @ 0	2.9 in. of Hg 40 in. of H₂O	1/2	2.0 A @ 208 V AC 2.0 A @ 230 V AC 1.0 A @ 460 V AC	68	11"	10"	10"	32° to 100°	1 1/4	1 1/4	0000000	00000000	00000000	000000	00000000	000000
2 psi 52 in. of H₂O	92 cfm @ 0	3.5 in. of Hg 48 in. of H₂O	1	3.4 A @ 208 V AC 3.2 A @ 230 V AC 1.6 A @ 460 V AC	68	13"	11"	12"	32° to 100°	1 1/2	1 1/2	0000000	00000000	00000000	000000	00000000	000000
2 psi 65 in. of H₂O	127 cfm @ 0	4.4 in. of Hg 60 in. of H₂O	1 1/2	5.1 A @ 208 V AC 4.9 A @ 230 V AC 2.5 A @ 460 V AC	74	14"	13"	14"	32° to 100°	1 1/2	1 1/2	0000000	00000000	00000000	000000	00000000	000000
Three Phase, 208/230/460V AC (Inverter Rated)
NPT Female Inlet and Outlet
4 psi 105 in. of H₂O	207 cfm @ 0	6.5 in. of Hg 88 in. of H₂O	5	13.0 A @ 208 V AC 12.0 A @ 230 V AC 6.0 A @ 460 V AC	72	19"	15"	15"	32° to 100°	2	2	0000000	00000000	00000000	000000	00000000	000000
4 psi 110 in. of H₂O	265 cfm @ 0	6.6 in. of Hg 90 in. of H₂O	6	16.0 A @ 208 V AC 15.0 A @ 230 V AC 7.5 A @ 460 V AC	79	17"	17"	18"	32° to 100°	2	2	0000000	00000000	00000000	000000	00000000	000000
5 psi 125 in. of H₂O	420 cfm @ 0	8.1 in. of Hg 110 in. of H₂O	10	35.0 A @ 208 V AC 29.5 A @ 230 V AC 15.0 A @ 460 V AC	78	22"	18"	20"	32° to 100°	2 1/2	2 1/2	0000000	00000000	00000000	000000	00000000	000000
Three Phase, 220/275/380/480V AC (Inverter Rated)
BSPP Female Inlet and Outlet
2 psi 64 in. of H₂O	57 cfm @ 0	4.4 in. of Hg 60 in. of H₂O	1/2	2.6 A @ 200 V AC 2.6 A @ 275 V AC 1.5 A @ 380 V AC 1.5 A @ 480 V AC	56	10"	10"	10"	5° to 100°	1 1/4	1 1/4	0000000	00000000	000000	00	000000	00
Three Phase, 230/460V AC (Inverter Rated)
NPT Female Inlet and Outlet
4 psi 105 in. of H₂O	795 cfm @ 0	7.0 in. of Hg 95 in. of H₂O	18	52.0 A @ 230 V AC 26.0 A @ 460 V AC	79	29"	18"	20"	32° to 100°	2 1/2	4	0000000	00000000	00000000	000000	00000000	00000000

Two Stage

Two Stage Blower

Blowers
						Overall				Pipe Size				Relief Valves
Maximum Pressure	Max. Flow Rate @ psi	Vacuum Rating	hp	Full Load Current	Vol., dBA	Lg.	Wd.	Ht.	Temp. Range, ° F	Inlet	Outlet		Each		Each
Three Phase, 208/230/460V AC (Inverter Rated)
NPT Female Inlet and Outlet
5 psi 140 in. of H₂O	65 cfm @ 0	11.1 in. of Hg 151 in. of H₂O	2	5.8 A @ 208 V AC 5.2 A @ 230 V AC 2.8 A @ 460 V AC	72	16"	13"	14"	5° to 100°	1 1/4	1 1/4	0000000	000000000	0000000	0000000
5 psi 141 in. of H₂O	81 cfm @ 0	11.1 in. of Hg 151 in. of H₂O	3	8.3 A @ 208 V AC 7.4 A @ 230 V AC 4.0 A @ 460 V AC	73	16"	14"	15"	5° to 100°	1 1/4	1 1/4	0000000	00000000	0000000	000000