Piston Seal, 4.00"X.280"

Hydraulic Piston Seal, 4.00"X.280"

The PSC-342 Piston Seal Assembly is a double-acting hydraulic piston seal designed to replace O-rings, quad-rings, and T-seals while using the same groove dimensions (O-ring dash -342). Made from 95A durometer polyurethane with a 70A nitrile energizer, it offers strong extrusion and abrasion resistance and a crowned sealing surface that provides a positive seal from vacuum to high pressure—because hydraulic leaks have a talent for showing up exactly where you can’t see them.

Country of Origin
Varies by production batch

Key Features / Specifications

• Product / Part Number: PSC-342
• Product Type: Double-acting piston seal assembly
• O-Ring Dash Number: -342
• Materials:
  • Seal: 95A polyurethane
  • Energizer: 70A nitrile
• Dimensions:
  • ID (A Nom / Groove Diameter): 3.625" (3-5/8")
  • OD (B Nom / Bore): 4.000"
  • Height (C Nom): 0.255"
  • Groove Width (D): 0.280"
  • Piston Diameter (I): 3.998"
• Performance Ratings:
  • Temperature Range: -40°F to +200°F
  • Pressure Range: 0 to 5,000 PSI
  • Max Speed: 3 ft/sec
• Weight: 0.022796 lb
• Design Notes (as provided): Crowned sealing surface for positive sealing; optional Style 575 urethane back-up rings can be added to one or both sides to accommodate wider groove widths
• Alternate / Cross Reference Numbers (as provided): CP-342, CP-342UR95, CPV-342, 375-9006-419, SM-00102, 81-5449

Ideal For

• Hydraulic cylinders needing a double-acting piston seal in an -342 groove
• Upgrades replacing O-rings / quad-rings / T-seals with a more robust piston seal design
• Systems operating up to 5,000 PSI and 3 ft/sec where abrasion and extrusion resistance matter
• Applications working across -40°F to +200°F temperature ranges