B 16.21 X 25.5 X .85/1.7

PTFE Spiral Back-up ring

- Rectangular cross section
- Material: PTFE
- Cut angle of 30° or 45°
- Consists of standard two spiral windings which are cut at the
ends at an angle
- Static and dynamic use
- For reciprocating movements only
- Preferred for installations in a closed groove where uncut
Back-up Ring are not suitable
- Compensation of large temperature changes and tolerances
through a screw-like elongation and contraction. Easy
installation in closed grooves for external sealing applications
- The dimensions are different compared to standard Back-up
Rings
- Recommended only if service diameter does not exceed 40
times the radial groove depth