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Style PSC Polyurethane Double-Acting Piston Seal, 1.50 Inch Bore Diameter, 1.25 Inch Groove Diameter, Inch Groove Width

Description & Features

The Style PSC Polyurethane Double-Acting Piston Seal is expertly designed for efficient performance in demanding hydraulic applications. Featuring a robust construction from 95A polyurethane with a 70A nitrile energizer, this seal is built to withstand pressure ranges from 0 to 5,000 PSI. It is suitable for a temperature range of -65°F to 220°F, ensuring reliable functionality in various environmental conditions. With a 1.50-inch bore diameter and a 1.25-inch groove diameter, this piston seal is the ideal choice for systems requiring precise sealing solutions without wear rings.

SKU: PSC-218

Supplier Part Number (MPN): PSC-218

Alternate Part Numbers: C1KM95

Specifications

Bore 1.50	Bore Tolerance (in) +0.002/-0	Brand Hercules Sealing Products	Brand Hercules Sealing Products	Pack Size 1.00	UOM EA	Groove Dia. E 1.25	Groove Width Tolerance (in) +0.005 / -0	Piston Dia. F 1.50	Piston Dia. Tolerance (in) +0/-0.002	Seal Height B 0.15	Supplier Part Number PSC-218	Alternate Part Numbers Alternate Part Number C1KM95	Product Weight 0.01 lbs

Similar Products

Model Number	Bore	Seal Height B	Groove Dia. E	Piston Dia. F	Bore Tolerance (in)	Groove Width Tolerance (in)	Piston Dia. Tolerance (in)
PSC-218 Double-Acting Piston Seal	1.5	0.15	1.254	1.498	+0.002/-0	+0.005 / -0	+0/-0.002
PSC-218-WB Double-Acting Piston Seal	1.5	0.265	1.254	1.498	+0.002/-0	+0.005 / -0	+0/-0.002
PSC-326 Double-Acting Piston Seal	2	0.255	1.625	1.998	+0.002/-0	+0.005 / -0	+0/-0.002
PSC-326-WB Double-Acting Piston Seal	2	0.37	1.625	1.998	+0.002/-0	+0.005 / -0	+0/-0.002
PSC-330 Double-Acting Piston Seal	2.5	0.255	2.125	2.498	+0.002/-0	+0.005 / -0	+0/-0.002
PSC-334 Double-Acting Piston Seal	3	0.255	2.624	2.997	+0.002/-0	+0.005 / -0	+0/-0.004
PSC-334-WB Double-Acting Piston Seal	3	0.37	2.624	2.997	+0.004/-0	+0.005 / -0	+0/-0.004
PSC-338 Double-Acting Piston Seal	3.5	0.255	3.125	3.498	+0.004/-0	+0.005 / -0	+0/-0.004
PSC-342 Double-Acting Piston Seal	4	0.255	3.625	3.998	+0.004/-0	+0.005 / -0	+0/-0.004
PSC-342-WB Double-Acting Piston Seal	4	0.37	3.625	3.998	+0.004/-0	+0.005 / -0	+0/-0.004
PSC-350 Double-Acting Piston Seal	5	0.255	4.636	4.999	+0.004/-0	+0.005 / -0	+0/-0.004
PSC-433-WB Double-Acting Piston Seal	6	0.5	5.521	5.999	+0.004/-0	+0.006 / -0	+0/-0.004

Product Questions & Answers (5)

Question by: Ricky T on Jan 4, 2026, 8:14 PM

got a 1.50 bore cylinder, is this PSC-218 the right size seal or am i gonna be fighting it

Answer by: Customer Support on Jan 6, 2026, 3:53 PM

The key numbers are a 1.50 inch bore with a +0.002/-0 tolerance, and a piston diameter of 1.498 inch with a +0/-0.002 tolerance. The seal is sized around a 1.254 inch groove diameter, and it has a 0.15 inch seal height, so it is meant to run in that groove setup rather than being a universal “close enough” seal.

Question by: Ray M on Sep 12, 2025, 4:57 PM

what's the pressure range on this seal? got a cylinder running around 3,500 PSI and need to know if it'll hold up

Answer by: Customer Support on Sep 13, 2025, 5:25 PM

Rated from 0 to 5,000 PSI, so 3,500 falls well within its operating range. The 95A polyurethane construction handles pressure pretty well without deforming under load, and the 70A nitrile energizer helps keep consistent contact against the bore wall throughout the pressure cycle.

Question by: Shane S on Feb 23, 2026, 2:47 PM

What size groove does this seal fit into? Just wanna make sure it matches up with my cylinder.

Answer by: Customer Support on Feb 24, 2026, 7:04 PM

The groove diameter it needs is 1.254 inches, with a groove width tolerance of +0.005 / -0 inches.

Question by: Harold H on Apr 9, 2025, 4:25 PM

Got a 1.5 inch bore cylinder that needs a new piston seal. Will the PSC-218 drop right in, or is there more to it than that?

Answer by: Customer Support on Apr 10, 2025, 7:54 PM

For a 1.50 inch bore, this seal is built to fit a piston diameter of 1.498 inches, with a tolerance of +0 / -0.002. The groove it seats into should be 1.254 inches in diameter. One thing worth knowing is that those piston diameter dimensions are given for pistons running without wear rings, so if your setup uses wear rings, that changes the fit calculation. Get those groove and piston dimensions confirmed before ordering and you should be in good shape.

Question by: Bonnie M on Sep 2, 2025, 2:51 PM

I need to know if this piston seal will fit my cylinder without wear rings. What piston diameter should I be looking for?

Answer by: Customer Support on Sep 4, 2025, 1:14 PM

For pistons without wear rings, you'll want a piston diameter of 1.498 inches. The acceptable tolerance is +0/-0.002 inches.