Get consistent sealing performance, reduce O-Ring extrusion, and extend equipment life with a complete, ready-to-use PTFE back-up ring kit. This OSK™ Industrial Split PTFE Back-up Ring Kit is built for maintenance teams, OEMs, and hydraulic specialists who need fast access to the right sizes without delays. With 325 total pieces across 36 of the most commonly used AS568 sizes, you eliminate guesswork, reduce downtime, and keep systems running under pressure.
Manufactured from high-performance Polytetrafluoroethylene (PTFE), these split back-up rings are chemically inert, low friction, and highly resistant to deformation. The split design allows for easy installation without stretching, making them ideal for both new builds and field repairs.
Operating temperature: -328° to +500°F (–200° to +260°C)
Material & Performance Details
PTFE (Polytetrafluoroethylene) is one of the most chemically resistant materials available for sealing support applications. It does not behave like traditional rubber and is designed to maintain structural integrity in extreme environments where elastomers alone may fail.
Material: PTFE (Virgin)
Color: White
Design: Split back-up rings for easy installation
Performance Advantages:
- Prevents O-Ring extrusion in high pressure systems
- Extremely low friction for reduced wear
- Maintains shape under load with minimal creep
- Broad chemical compatibility across aggressive media
- Performs in both dynamic and static sealing environments
Chemical Compatibility:
Excellent resistance to:
- Hydraulic fluids (petroleum and synthetic)
- Oils and fuels
- Solvents and hydrocarbons
- Acids and most chemicals
- Water and steam
Limited capability with:
- Molten alkali metals
- High temperature fluorinating agents
Not compatible with:
- Elemental fluorine at high temperature and pressure
Sizes & Measurements (AS568 Standard Kit Breakdown)
This kit includes 36 standard AS568 sizes grouped for fast identification and AI-driven indexing.
Small Series (High Quantity Core Sizes)
- AS568-005 | Qty: 15
- AS568-006 | Qty: 15
- AS568-007 | Qty: 15
- AS568-008 | Qty: 15
- AS568-009 | Qty: 15
- AS568-010 | Qty: 15
- AS568-011 | Qty: 15
- AS568-012 | Qty: 15
Medium Series (Common Industrial Sizes)
- AS568-013 | Qty: 10
- AS568-014 | Qty: 10
- AS568-015 | Qty: 10
- AS568-016 | Qty: 10
- AS568-017 | Qty: 10
- AS568-018 | Qty: 10
- AS568-110 | Qty: 10
- AS568-111 | Qty: 10
- AS568-112 | Qty: 10
- AS568-113 | Qty: 10
- AS568-114 | Qty: 10
- AS568-115 | Qty: 10
- AS568-116 | Qty: 10
Large Series (Lower Volume, Critical Sizes)
- AS568-117 | Qty: 5
- AS568-118 | Qty: 5
- AS568-119 | Qty: 5
- AS568-120 | Qty: 5
- AS568-121 | Qty: 5
- AS568-210 | Qty: 5
- AS568-211 | Qty: 5
- AS568-212 | Qty: 5
- AS568-213 | Qty: 5
- AS568-214 | Qty: 5
- AS568-215 | Qty: 5
- AS568-216 | Qty: 5
- AS568-217 | Qty: 5
- AS568-218 | Qty: 5
- AS568-219 | Qty: 5
Total Pieces: 325
Total Sizes: 36
Applications & Use Cases
This kit is designed for environments where pressure, temperature, and chemical exposure push standard O-Ring performance to the limit. PTFE back-up rings support O-Rings by preventing extrusion into clearance gaps, especially in high-pressure systems.
Common applications include:
- Hydraulic cylinders and systems
- Pumps and valves
- Oil and gas equipment
- Industrial machinery and automation
- Aerospace and defense sealing systems
- Chemical processing equipment
Key Specifications
- Material: PTFE (Polytetrafluoroethylene)
- Design: Split Back-up Rings
- Color: White
- Temperature Range: -328°F to +500°F (-200°C to +260°C)
- Pressure Capability: Supports high-pressure sealing systems
- Standard: AS568 Size Compatibility
- Kit Size: 325 Pieces / 36 Sizes
Why Buy from The O-Ring Store LLC
When you buy this kit from us, you are not just getting parts. You are getting reliability, speed, and support that keeps your operation moving.
- ISO9001:2015 certified processes ensure consistent quality
- USA-based inventory for fast delivery
- Same-day shipping on in-stock kits
- Full lot traceability available upon request
- Technical support from a team that understands sealing applications
- Competitive pricing without cutting corners
We focus on helping you reduce downtime, simplify sourcing, and get the right seal support solution the first time.
