Piston Seal

Hydraulic Piston Seal

The MPSU-45X4X2.9 MPSU Piston Seal Assembly is a wear-resistant piston seal designed for high-pressure hydraulic applications up to 5,000 PSI. Molded from glass/PTFE-filled polyester and energized with nitrile O-rings, it’s interchangeable with MPS-style seals of the same dimensions—built to seal hard and wear slow, like it’s personally offended by leakage.

Country of Origin
Varies by production batch

Key Features / Specifications

• Model / Part Number: MPSU-45X4X2.9
• Product Type: Piston seal assembly (MPSU style)
• Material: Glass/PTFE filled polyester seal with rubber (nitrile) energizer O-rings
• Composition Notes: Polyester with 5% glass fiber and 5% PTFE additives; nitrile O-rings used as energizers
• Nominal Size: 34 (ID) x 45 (OD) x 4 (Height) mm
• ID / Groove Diameter (H): 34.00 mm
• OD / Bore: 45.00 mm
• Groove Width (D): 4.20 mm
• Temperature Range: -40°F to +230°F
• Pressure Range: 0 to 5,000 PSI
• Weight: 0.00732100 lbs
• Interchange / MFG References: AS636E-45B, MPSP-045X034.0X4.2, MPSP-045X034.0X4.3, P045034042P2B/754, SK-2686

Ideal For

• Hydraulic cylinders needing a 34 x 45 x 4 mm piston seal assembly
• High-pressure service up to 5,000 PSI where wear resistance is critical
• Rebuilds where you need MPS-style interchangeability with glass/PTFE-filled polyester durability
• Systems operating in wide temps from -40°F to +230°F