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Style PSC Polyurethane Double-Acting Piston Seal, 4.00 Inch Bore Diameter, 3.63 Inch Groove Diameter, Inch Groove Width

Bore 4	Bore Tolerance (in) +0.004/-0	Brand Hercules Sealing Products	Brand Hercules Sealing Products	Pack Size 1.00	UOM EA	Groove Dia. E 3.63	Groove Width Tolerance (in) +0.005 / -0	Piston Dia. F 4.00	Piston Dia. Tolerance (in) +0/-0.004	Seal Height B 0.26	Supplier Part Number PSC-342	Alternate Part Numbers Alternate Part Number C1GG37, Alternate Part Number MI-01037575, Alternate Part Number MINO-00407X30170	Product Weight 0.03 lbs

Product Questions & Answers 1

Product Questions & Answers

got a 4 inch bore cylinder, is this PSC-342 the right piston seal size or am i gonna be fighting it

Question by: Melvin F on Jul 9, 2025, 12:45 PM

The key numbers are a 4.00 inch bore and a 3.625 inch groove diameter. The piston diameter (F) is listed as 3.998 inches with a +0/-0.004 tolerance, and that F dimension is meant for pistons set up without wear rings.

Answer by: Customer Support on Jul 11, 2025, 7:27 AM

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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	1.5	0.15	1.254	1.498	+0.002/-0	+0.005 / -0	+0/-0.002
PSC-218-WB	1.5	0.265	1.254	1.498	+0.002/-0	+0.005 / -0	+0/-0.002
PSC-326	2	0.255	1.625	1.998	+0.002/-0	+0.005 / -0	+0/-0.002
PSC-326-WB	2	0.37	1.625	1.998	+0.002/-0	+0.005 / -0	+0/-0.002
PSC-330	2.5	0.255	2.125	2.498	+0.002/-0	+0.005 / -0	+0/-0.002
PSC-334	3	0.255	2.624	2.997	+0.002/-0	+0.005 / -0	+0/-0.004
PSC-334-WB	3	0.37	2.624	2.997	+0.004/-0	+0.005 / -0	+0/-0.004
PSC-338	3.5	0.255	3.125	3.498	+0.004/-0	+0.005 / -0	+0/-0.004
PSC-342	4	0.255	3.625	3.998	+0.004/-0	+0.005 / -0	+0/-0.004
PSC-342-WB	4	0.37	3.625	3.998	+0.004/-0	+0.005 / -0	+0/-0.004
PSC-350	5	0.255	4.636	4.999	+0.004/-0	+0.005 / -0	+0/-0.004
PSC-433-WB	6	0.5	5.521	5.999	+0.004/-0	+0.006 / -0	+0/-0.004