BT-FN For a larger view, please mouseover the image.
For a larger view, please mouseover the image.
Item Description
1 Seal face
2 Stationary seat
3, 3a, 3b O-Ring
4 Spring
5 Collar
  • Single pusher-type seal
  • Unbalanced
  • Conical spring
  • Dependent on direction of rotation
The BT-FN combines a spring loaded ceramic seal face and the traditional pusher mechanical seals. The competitive price and the wide range of applications have made the BT-FN seal a success. The seal is produced with punched metal parts that allow an economical design.

BT-FN mechanical seals are also the ideal solution for light chemicals media applications. To ensure the best reliable performance, we recommend a material combination of hard material sliding faces and proper elastomer O-Rings.
Shaft diameter:
d1*= 10 … 40 mm (0.39" … 1.57")
Pressure: p1*= 12 (16) bar (174 (232) PSI)
t* = -35 °C… +180 °C (-31 °F … +356 °F)
Sliding velocity: vg = 15 m/s (49 ft/s)

* Dependent on medium, size and material
Seal face:
Steatite (X), Aluminium oxide (V), Silicon carbide (Q1, Q6), Tungsten carbide (U1)
Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Silicon carbide (Q1, Q6), Tungsten carbide (U1)
NBR (P), EPDM (E), FKM (V), FFKM (K)
Metal parts: CrNi steel 1.4301 (F), CrNiMo steel 1.4401 (G)
  • KTW
  • W270
  • ACS
  • WRAS
  • NSF
  • FDA
  • DM 174/04
  • Building services industry
  • Household appliances
  • Centrifugal pumps
  • Clean water pumps
  • Pumps for domestic applications and gardening
Seat ring of alternative seats can be supplied with short tail or with pin to block the seat and prevent seat rotation.