8-439N90
90A Nitrile Back-Up Ring, 6.524 X 6.996 X 0.236, Dash# 439
Part #:
8-439N90
Min. Order Qty: 1
Brand: HPSI
HPSI
90A Nitrile Back-Up Rings are molded from 90A Buna-N and designed to help prevent O-ring extrusion in high-pressure applications. These Parbak®-style rings feature a dished cross-section that provides uniform contact with the O-ring, while the flat surface faces the extrusion gap. The rings stretch for easy installation and quickly return to their original size after installation. Resistant to grease, petroleum fluids, and motor oil, they are sized to standard AS568 O-ring dash numbers for use in static and dynamic sealing applications.
| Construction | : | Solid |
| Dash Number | : | -439 |
| Inside Diameter | : | 6.524 in |
| Material | : | 90A Nitrile |
| Outside Diameter | : | 6.996 in |
| Part Number | : | (Prefix)-(O-Ring Dash#)(Material) |
| Temperature Range | : | -40° to 240°F |
| Thickness | : | 0.117 in |
| Width | : | 0.236 in |
- 90A Buna-N (nitrile) construction provides durable back-up ring performance
- Helps prevent O-ring extrusion in high-pressure applications
- Parbak®-style dished cross-section provides uniform contact with the O-ring
- Flat surface faces the extrusion gap
- Stretchable design supports easy installation
- Quickly returns to original size after installation
- Excellent resistance to grease, petroleum fluids, and motor oil
- Standard AS568 O-ring dash-number sizing
- Suitable for static and dynamic sealing applications
