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Style PSC Bronze Filled Piston Seal, 4.00 Inch Bore Diameter, 3.38 Inch Groove Diameter, Inch Groove Width

Description & Features

The Style PSC Bronze Filled Piston Seal is designed for applications requiring high durability and superior performance. With a bore diameter of 4.00 inches and a groove diameter of 3.38 inches, this seal is engineered to fit precisely in hydraulic systems. Made from 40% bronze-filled PTFE, the seal offers excellent resistance to wear and high temperatures, functioning effectively within a temperature range of -40°F to 220°F. The piston seal can withstand pressure levels up to 5,000 PSI, making it suitable for demanding industrial environments.

This product features a rubber energizer and a quattro ring, ensuring optimal sealing performance. It is particularly useful for pistons without wear rings, enhancing the longevity and reliability of the hydraulic system. Manufactured by Hercules Sealing Products, this seal meets the rigorous standards expected in industrial parts.

SKU: PSQ-64

Supplier Part Number (MPN): PSQ-64

Alternate Part Numbers: C1GN15, MI-03110293, MINO-00407X12258

Specifications

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 3.38	Groove Width Tolerance (in) +0.005 / -0	Piston Dia. F 4.00	Seal Height B 0.27	Supplier Part Number PSQ-64	Alternate Part Numbers Alternate Part Number C1GN15, Alternate Part Number MI-03110293, Alternate Part Number MINO-00407X12258	Product Weight 0.07 lbs

Similar Products

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

Product Questions & Answers (3)

Question by: Kent W on Jan 30, 2026, 6:27 PM

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

Answer by: Customer Support on Feb 1, 2026, 6:01 PM

The key callouts are a 4.00 inch bore and a piston diameter (F) of 3.999 inches, with the note that those piston dimensions are for pistons without wear rings. It’s also built around a groove diameter of 3.384 inches, and the bore tolerance listed is +0.004 / -0.

Question by: Kurt W on May 26, 2025, 3:51 PM

What’s the deal with needing no wear rings for this thing to work right?

Answer by: Customer Support on May 28, 2025, 6:18 AM

This piston seal is sized specifically for pistons that don't have wear rings, so it fits properly and seals as it should.

Question by: Rod W on Sep 23, 2025, 9:30 AM

Got a 4-inch bore cylinder that don't have wear rings on the piston, will this seal work for that setup?

Answer by: Customer Support on Sep 25, 2025, 6:39 AM

That's what this seal is built for. The piston diameter spec listed is 3.999 inches, and the groove diameter comes in at 3.384 inches, so it fits right into that bore without needing wear rings to function properly. The 40% bronze-filled PTFE construction helps it handle the side loading and friction that pistons without wear rings tend to see more of.