Item Part no. to
DIN 24250
Description
1.1 472 Seal face
1.2 485 Drive collar
1.3 474 Thrust ring
1.4 412.1 O-Ring
1.5 477 Spring
1.6 904 Set screw
2 475 Seat (G9)
3 412.2 O-Ring

1) d1 > 100 mm: 30°
2) d1 > 100 mm: +0.1
3) d1 > 100 mm: H7

M7N

Features

  • For plain shafts
  • Single seal
  • Unbalanced
  • Super-Sinus-spring
  • Independent of direction of rotation

Advantages

  • Universal application opportunities
  • Efficient stock keeping due to easily interchangeable faces
  • Extended selection of materials
  • Insensitive to low solids contents
  • Flexibility in torque transmissions
  • Self cleaning effect
  • Short installation length possible (G16)
  • Pumping screw for media with higher viscosity (M7..F)

Operating range

Shaft diameter:
d1 = 14 ... 100 mm (0.55 " … 3.94 ")
Pressure:
p1 = 25 bar (363 PSI)
Temperature:
t = -50 °C ... +220 °C
(-58 °F ... +428 °F)
Sliding velocity:
vg = 20 m/s (66 ft/s)

Axial movement:
d1 = up to 25 mm: ±1.0 mm
d1 = 28 up to 63 mm: ±1.5 mm
d1 = from 65 mm: ±2.0 mm

Materials

Seal face: Silicon carbide (Q1)
Seat G9: Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Silicon carbide (Q1)
Seat G4, G6 (Q1), Seat G13 (A, B)

Secondary seals: EPDM (E), FKM (V), FFKM (K)
Springs: CrNiMo steel (G)
Metal parts: CrNiMo steel (G), Duplex (G1)

Standards and approvals

  • EN 12756
  • WRAS
  • UBA(KTW)



Product variants

M74
Dimensions, items and descriptions as for M7N, but with multiple springs (Item no. 1.5).
Preferably for d1 >100 mm (3.94").
M7F
Shaft diameter d1 = max. 100 mm (3.94")
Dimensions, items and descriptions as for type M7N, but with pumping screw, dependent on direction of rotation.
(Viscosity ≤ ISO VG10).
M74F
Shaft diameter:
d1 = 14 ... 200 mm (0.55" ... 7.87")
Dimensions, items and descriptions as for type M7N, but with multiple springs and pumping screw, dependent on direction of rotation.
(Viscosity ≤ ISO VG10).
M7S2
Shaft diameter: d1 = max. 100 mm (3.94").
Dimensions, items and descriptions as for type M7N, but with drive key.
(without item no. 1.6)
M74S2
Shaft diameter:
d1 = 28 … 200 mm (1.10" ... 7,87")
Dimensions, items and descriptions as for type M7N, but with multiple springs and drive key.
(without item no. 1.6)
M78N
Shaft diameter:
d1 = 18 … 100 mm (0.71" … 3.94")
Temperature: t = max. 180 °C (356 °F)

Dimensions, items and description as for M7N. Design of the seal face especially for secondary sealing element made of PTFE (T).
Seal face: Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Silicon carbide (Q1)*
Seat G9: Special cast CrMo steel (S)*, Silicon carbide (Q1)

* Cannot be combined with seal face made of silicon carbide (Q1)

Similar products

eHJ

  • For unstepped shafts
  • Single seal
  • Balanced
  • Independent of direction of rotation
  • Encapsulated rotating spring
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