Type BP (Spiral) - BP4700806-PT008

Rectangular cross-section. Consists of two spiral windings which are cut at the ends at an angle of 30° or 45°. Designed for static and dynamic use, but when used in a dynamic application they should be used for reciprocating movements only.

Availability: In Stock

Price (per piece)
3-9 € 22,25
10-24 € 10,90
25-49 € 7,28
50-99 € 5,23
100-249 € 3,81
250+ € 2,57

Installation Dimensions:

Bore Diameter DN H8   //   Groove Diameter d6 H9
90.0  mm
Groove Width, b2 +0.25
9.0  mm
Groove Width, b3 +0.25
10.9  mm
Radius, r ±0.2
0.25  mm
Groove Diameter d3 h9   //   Rod Diameter dN f7
80.6  mm

Internal Sealing (Rod) and External (Bore) sealing:

Back-up Ring dimensions OD x W x T
90.0 x 4.70 x 0.85  mm
O-Ring TSS Part No.
O-Ring dimensions d1 x d2
78.74 x 5.33  mm

Material Properties:

Maximum Operating Temperature
120.0  °C
Tensile Strength
20.0  MPa
Elongation at break
250.0  %
Minimum Operating Temperature
-45.0  °C
Hardness Nominal
Hardness Tolerance
+/- 5  
Hardness Unit
Shore D  
installation drawing table

Material Information for the product(s) on this page BP4700806-PT008


Basic Material
55 (Shore D)
Commercial Description
Unfilled PTFE. This material is standard for back-up rings. Unfilled PTFE helps prevent extrusion in low- to medium-duty applications where an O-ring used by itself would not be suitable.