Synertech Stock
Rotating shaft oil seals G
Oil seal in rubber-metal, manufactured according to ISO 6194 and DIN 3760 standards. Coated metal case, single lip. Radial lip seal for shafts and spindles.
Product codes
Details
The G series rotary shaft seals, universally known on the market as standard rubber-covered oil seals or Type G, are dynamic seals designed to ensure perfect retention of fluid lubricating oils and greases within rotating mechanical components. Featuring an internal metal reinforcement and a dynamic lip preloaded by a garter spring, they provide an effective hydrodynamic barrier and prevent the ingress of light external contaminants.
Type G / WA Standard
Single-lip dynamic sealing profile equipped with an internal spring and a completely smooth elastomer-covered outer diameter.
Type G/DL
Geometric variant, where applicable, equipped with an additional front dust lip without a spring, specifically designed for dusty external environments.
Materials and operating conditions
| Material / Compound | Peripheral speed | Temperature | Max pressure |
|---|---|---|---|
| NBR Nitrile rubber 70 / 80 ShA |
Up to 12.0 m/s Up to 0.5 m/s in low-speed applications |
−30 / +100 °C | 0.05 MPa Standard atmospheric pressure |
| FKM Fluoroelastomer / Viton |
Up to 35.0 m/s | −20 / +200 °C | — |
Garter spring
Mineral hydraulic oils, fluid gear lubricants, lubricating greases, water and fluid emulsions.
Main features
Constant radial load
The spring positioned behind the lip applies calibrated and continuous radial pressure to the rotating shaft diameter.
This compensates for elastomer ageing, minor misalignments (run-out) and normal wear, maintaining the dynamic sealing area.
Rubber-covered outer surface
The elastomer outer casing ensures optimal static sealing within the housing and compensates for thermal expansion and minor surface roughness of the metal seat.
Sealing edge
The main lip is finished with a precise, sharp geometric cut. The angle creates a hydrodynamic wedge that uses the surface tension of the oil film to limit leakage and provide self-lubrication of the running surface.
Why choose Type G
Liquid fluid sealing
The presence of the spring makes this seal particularly suitable for very fluid, low-viscosity oils, overcoming the performance limitations of conventional springless grease seals.
Safe installation
The rubber coating reduces the mechanical force required for press-fitting into the housing, limiting the risk of scoring or deformation of the casing.
High rotational speeds
The flexibility of the lip and the quality of the compounds, especially in the FKM Viton version, limit the heat generated by friction and allow high peripheral speeds.
Typical applications
- Gearboxes, speed reducers and industrial and agricultural geared motors
- Crankshafts, camshafts, wheel hubs and differentials in the automotive sector
- Hydraulic pumps, centrifugal pumps, fans and positive displacement compressors
- Industrial electric motors and machine tool transmission shafts
- Power take-offs (PTO) and angle drives in tractors and self-propelled agricultural equipment
International standards
Construction dimensions, geometric tolerances and installation dimensions manufactured in compliance with DIN 3760 Form A and ISO 6194-1 Type 1 standards, corresponding to the universal WA / SC profile.
Available configurations
Type G Standard
The most widely used configuration in general mechanical engineering and the industrial aftermarket. It represents the universal standard for retaining conventional mineral oils at medium temperatures.
Type G Premium
Specific configuration for high-speed shafts, up to 35 m/s, or applications operating at high temperatures in contact with aggressive synthetic oils with high thermal stability.
Market equivalents
| Manufacturer | Type G Standard - NBR | Type G Premium - FKM / Viton |
|---|---|---|
| Net Seals | Oil Seal Series WA / SC / G | Viton Oil Seal Series WA / SC / G FKM |
| Freudenberg (Simrit) | Simmerring® BA / 827N Profile | Simmerring® BA FKM Profile |
| Parker Prädifa | OSHA / SC Profile | OSHA (FKM) Profile |
| Dichtomatik | WA Profile | WA FKM Profile |
| Kastas Sealing Technologies | K26 / K29 Profile | — |
| Corteco | Standard Type G Oil Seal Series | — |
| SKF | — | Viton rubber-covered seals (HMS5) |