• OK Piston Seal – Heavy-Duty Two-Piece Piston Seal-1
  • OK Piston Seal – Heavy-Duty Two-Piece Piston Seal-2
  • OK Piston Seal – Heavy-Duty Two-Piece Piston Seal-3
  • OK Piston Seal – Heavy-Duty Two-Piece Piston Seal-4
OK Piston Seal – Heavy-Duty Two-Piece Piston Seal-1
X
OK Piston Seal – Heavy-Duty Two-Piece Piston Seal-1

OK Piston Seal

Brand : SANPING SEAL
ltem NO. : OK
Product Origin : China
Shipping Port : Guangzhou
MOQ : 10 pieces

Categories: ,

Contact Now
The OK piston seal is a heavy-duty two-piece piston seal designed for double-acting hydraulic cylinders . It consists of a hard, split plastic slide ring and a rectangular NBR elastomer energizer . This design provides extreme wear resistance, exceptional extrusion resistance, and high pressure capability, making it ideal for demanding construction and mining equipment applications .
SANPING SEAL – Engineering Machinery High-End Seals – 17 Years Export Expertise
Product Overview
The OK piston seal is specifically engineered for heavy-duty hydraulic applications and is preferably used in double-acting cylinders . It is extremely robust and withstands even extreme pressure peaks . The sealing set consists of a specially formulated slide ring and an elastomer energizer .
The seal features a split design that allows for easy installation on one-piece (solid) pistons without the need for auxiliary tools . Once installed into the bore, the diameter of the OK seal is compressed to close the step cut, providing excellent, drift-free sealing performance .
How It Works
The OK seal operates through a combination of energizer preload and pressure activation. The rectangular NBR energizer provides initial sealing contact with the cylinder bore. As system pressure increases, the hydraulic fluid activates the energizer, which pushes the hard slide ring outward against the cylinder wall, creating a self-energizing sealing effect .
The glass-filled nylon or modified thermoplastic slide ring provides extreme resistance to shock loads, wear, and contamination, and resists extrusion or chipping when passing over cylinder ports .
Specifications and Parameters
Parameter Detail
Product Name OK Piston Seal
Type Two-piece heavy-duty piston seal
Slide Ring Material Filled modified thermoplastic / Glass-filled nylon 
Energizer Material NBR (Nitrile Butadiene Rubber), ~70 Shore A 
Working Pressure Up to 800 bar / 80 MPa 
Temperature Range -30°C to +110°C 
Working Speed ≤ 1 m/s 
Standard ISO
Application Piston seal for double-acting hydraulic cylinders
Product Features
1. Split Design for Easy Installation
The OK seal features an open split design, allowing for straightforward installation on one-piece pistons without special tools . This eliminates the installation difficulties associated with traditional Glyd rings .
2. Extreme Pressure Capability
With a maximum working pressure of up to 800 bar (80 MPa) and resistance to extreme pressure peaks up to 100 MPa , the OK seal handles the most demanding heavy-duty applications.
3. High Extrusion Resistance
Due to the special material properties of the seal ring and its hard construction, the OK seal provides extremely high extrusion resistance, even under high pressure and with large clearances . This allows for larger piston-to-cylinder gaps, reducing machining costs .
4. Excellent Wear Resistance
The hard, filled thermoplastic/glass-filled nylon slide ring provides outstanding wear resistance and long service life in abrasive environments .
5. Insensitive to Shock Loads
The seal maintains stable performance under extreme pressure peaks and shock loads, making it ideal for construction and mining equipment .
6. Low Friction Throughout Service Life
Even after long idle periods at high pressure, the OK seal provides low start-up friction and low motion friction .
7. Compact Design
The OK profile features a small cross-section with short axial assembly length, saving installation space .
8. Good Dynamic & Static Sealing
Provides excellent sealing performance in both dynamic and static conditions .
Need OK heavy-duty piston seals for your excavator or high-pressure hydraulic applications?
Contact SANPING SEAL today with your bore size and application requirements. Our team will provide a free quote within 24 hours.

Request Inquery

About us

Guangzhou Sanping Machinery Co., Ltd., established in 2009, is a professional and diversified import and export company integrating development, production, sales, and agency services. The company focuses on the core field of oil seals, with products widely used in the hydraulic and chassis systems of excavators, hydraulic breakers, loaders, bulldozers, and other engineering machinery.

Request a Quote

Contact Us

  • Guangzhou Sanping Machinery Co., Ltd.
  • +86 13580459955phoebezhang@spseals.cn
  • 201,Jide Building,Zhonghaijing,No.1 Dashadi West,Huangpu District,Guangzhou Contact person: Phoebe Zhang
  • Copyright © 2026 Guangzhou Sanping Machinery Co., Ltd.  All Rights Reserved.  privacy policy

    Contact Us

    Request Inquery