Description
The SC profile rotay shaft  seal is the rubber covered metal shell oil seal a single metal cage with a rubber coating and a primary sealing lip with integrated spring. The metal shell performs as a support. The spring provides the seal lip with radial pressure to avoid lubricant leakage. Applicable to operating condition with sealing media on one side and no dust on the other side.
Advantages
Very good static sealing
Very good thermal expansion compensation
Greater roughness is allowed in the housing
Reduced risk of corrosion
Sealing for low and high viscosity fluids
Modern primary sealing lip with low radial forces
Protection against undesirable air contaminants

Applications

Shaft sealing
Motors
Pumps
Transmissions

Speed

The table below indicates the relationships between the linear speed, the rotation speed and the recommended material.

The shaft seals with an additional protective lip are limited to a speed of 8 m/s.
Linear speed calculation:
s (m/s) = [Ø shaft (mm) x speed (rpm) x π] / 60,000

Pressure

The standard shaft seals are generally used in unpressurised environments, or for pressures between 0.02 and 0.05 MPa maximum.
Higher pressures are acceptable, following testing, for standard NBR or FKM shaft seals used on a shaft diameter less than 30 mm. Refer to the graph below:

For higher pressures, we recommend using high-pressure SCHP - TCHP shaft seals which, because of their specific design (shorter sealing lip, thicker rubber membrane, metal cage closer to the shaft), can support pressures of up to 1.0 MPa with speeds reduced to 0.3 m/s.

Temperature

The table below indicates the temperature limits, depending on the materials and fluids used.Shaft material
Suitable materials are:

• ordinary C35 and C45 steels used in mechanical construction
• 1.4300 and 1.4112 stainless steels for sealing water
• sprayed carbide coatings
• graphite
• malleable cast iron
• materials with a CVD and PVD coating

Not appropriate:

• chrome coatings solidified through non-uniform wear
• plastic materials resulting from low thermal conductivity, which can lead to a disturbance in the transport of heat, an increase in temperature in friction areas with the shaft seal, as well as a potential softening

Shaft hardness
Shaft hardness will depend on the linear speed (in m/s) and the level of pollution.Surface roughness
The recommendations below must be considered for the quality of the shaft surface area.
Standard conditions:

• Ra = 0.2 to 0.8 µm and 0.1 for demanding applications
• Rz = 1.0 to 4.0 µm
• Rmax ≤ 6.3 µm

For pressurev > 0.1 MPa:

• Ra = 0.2 to 0.4 µm and 0.1 for demanding applications
• Rz = 1.0 to 3.0 µm
• Rmax ≤ 6.3 µm

Shaft tolerance
The shaft must have a tolerance of h11, in line with standard ISO 286-2Chamfer and radius
You are strongly advised to install a chamfer on the shaft so as not to alter the primary sealing sealing lip of the shaft seal during assembly. Please refer to the table below.