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Style PSC Polyurethane Double-Acting Piston Seal, 2.50 Inch Bore Diameter, 2.13 Inch Groove Diameter, Inch Groove Width

Description & Features

Constructed from 95A polyurethane with a 70A nitrile energizer, this double-acting piston seal is rated for pressures from 0 to 5,000 PSI and temperatures ranging from -65°F to 220°F, making it well-suited for demanding hydraulic cylinder applications. The Style PSC Polyurethane Double-Acting Piston Seal, 2.50 Inch Bore Diameter, 2.13 Inch Groove Diameter features a 2.498-inch piston diameter with a tight tolerance of +0.000/-0.002 inches, ensuring consistent sealing performance within the bore. Bore tolerance is held to +0.002/-0 inches, and groove width tolerance is +0.005/-0 inches, supporting precise fitment in standard hydraulic cylinder configurations. Seal height measures 0.255 inches, and the groove diameter is 2.125 inches. This seal is manufactured by Hercules Sealing Products under catalog number C1GG34.

SKU: PSC-330

Supplier Part Number (MPN): PSC-330

Alternate Part Numbers: C1GG34, MI-01037516, MINO-00407X30164

Specifications

Bore 2.50	Bore Tolerance (in) +0.002/-0	Brand Hercules Sealing Products	Brand Hercules Sealing Products	Pack Size 1.00	UOM EA	Groove Dia. E 2.13	Groove Width Tolerance (in) +0.005 / -0	Piston Dia. F 2.50	Piston Dia. Tolerance (in) +0/-0.002	Seal Height B 0.26	Supplier Part Number PSC-330	Alternate Part Numbers Alternate Part Number C1GG34, Alternate Part Number MI-01037516, Alternate Part Number MINO-00407X30164	Product Weight 0.02 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 (3)

Question by: Neal H on Sep 16, 2025, 9:55 PM

What kind of pressure can this seal handle, cause I'm working with some pretty heavy stuff?

Answer by: Customer Support on Sep 18, 2025, 6:36 AM

This seal is rated to handle pressures from 0 to 5,000 PSI, making it suitable for demanding hydraulic applications.

Question by: Frank B on Mar 27, 2026, 11:10 AM

got a 2.50 inch bore cylinder that needs a new piston seal, will the PSC-330 drop right in, or is there fitment stuff I need to watch for?

Answer by: Customer Support on Mar 29, 2026, 6:52 AM

For a 2.50 inch bore cylinder, this seal is built around a 2.498 inch piston diameter with a tolerance of +0.000/-0.002 inches, and the bore tolerance runs +0.002/-0 inches. Those tight tolerances are what keep the seal performing consistently, so as long as your cylinder dimensions fall within those specs, fitment should be solid. One thing worth knowing: the piston diameter listed assumes a piston without wear rings, so if your setup uses wear rings, account for that when checking your dimensions. Groove diameter is 2.125 inches with a seal height of 0.255 inches, so double-check your groove before ordering.

Question by: Terry H on Mar 1, 2026, 8:59 AM

trying to swap out a worn piston seal. what sizes does this PSC-330 actually fit?

Answer by: Customer Support on Mar 2, 2026, 4:15 PM

It is set up for a 2.50 inch bore with a 2.125 inch groove diameter. The piston diameter is 2.498 inches with a +0.000/-0.002 tolerance, the bore tolerance is +0.002/-0, and the seal height is 0.255 inches. Groove width tolerance is +0.005/-0.