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Style PSC Bronze Filled Piston Seal, 3.50 Inch Bore Diameter, 2.88 Inch Groove Diameter, Inch Groove Width

Bore 3.50	Bore Tolerance (in) +0.004/-0	Brand Hercules Sealing Products	Brand Hercules Sealing Products	Pack Size 1.00	UOM EA	Groove Dia. E 2.88	Groove Width Tolerance (in) +0.005 / -0	Piston Dia. F 3.50	Seal Height B 0.27	Supplier Part Number PSQ-56	Alternate Part Numbers Alternate Part Number C1GN14, Alternate Part Number PSA-56	Product Weight 0.06 lbs

Product Questions & Answers 3

Product Questions & Answers

seal's rated up to 5,000 PSI, is that the ceiling for continuous use or just a peak rating?

Question by: Kent C on Oct 29, 2025, 8:49 PM

That pressure range covers the full operating window for this seal, from zero up to 5,000 PSI. It's not listed as a short-burst peak figure. The 40% bronze filled PTFE construction handles pressure loading well, and the rubber energizer keeps things seated under varying load conditions. Just keep in mind the piston diameter spec of 3.499 inches assumes no wear rings are in place, so factor that in when you're setting up your bore fit.

Answer by: Customer Support on Oct 31, 2025, 6:36 AM

What's the temperature range this seal can handle?

Question by: Peggy B on Feb 15, 2026, 6:25 AM

This seal is rated to handle temperatures from -40°F all the way up to 220°F.

Answer by: Customer Support on Feb 16, 2026, 3:08 PM

got a cylinder with a 3.50 bore, is this seal the right size for that or am i gonna be fightin it?

Question by: Eddie R on Aug 21, 2025, 7:13 AM

It matches a 3.50 inch bore and calls out a piston diameter F of 3.499 inches. The groove diameter is 2.884 inches, and the bore tolerance noted is +0.004/-0, so it’s intended for that bore size without needing to force it.

Answer by: Customer Support on Aug 23, 2025, 6:36 AM

Similar Products

Model Number	Bore	Seal Height B	Groove Dia. E	Piston Dia. F	Bore Tolerance (in)	Groove Width Tolerance (in)
PSQ-40	2.5	0.271	1.884	2.499	+0.004/-0	+0.005 / -0
PSQ-48	3	0.271	2.384	2.999	+0.004/-0	+0.005 / -0
PSQ-56	3.5	0.271	2.884	3.499	+0.004/-0	+0.005 / -0
PSQ-64	4	0.271	3.384	3.999	+0.004/-0	+0.005 / -0
PSQ-80	5	0.271	4.384	4.999	+0.004/-0	+0.005 / -0