Synertech Stock
Grease seals GSM/W
The GSM_W grease seal is an NBR-coated sealing ring with an internal metal case, rubber grooves on the outside of the case, and a main sealing lip without a spring.
Product codes
Details
The GSM_w series grease seals are rotary shaft seals designed for the retention of lubricating greases in applications with limited axial space. The profile features an internal "L"-shaped metal reinforcement completely embedded in the elastomer, a flexible springless dynamic lip and a rubber-covered outer diameter with a wave/ribbed profile. This configuration reduces press-fitting force and improves static sealing even in the presence of significant thermal expansion of the housing.
GSM_w Standard
Springless single-lip profile with an outer diameter featuring parallel wave-shaped rubber ribs.
GSM_w Special
Variant with an additional front dust lip on the air side, where available for specific dimensions, to increase protection against external contaminants.
Materials and operating conditions
| Material / Compound | Peripheral speed | Temperature | Max pressure |
|---|---|---|---|
| NBR Nitrile rubber 70 / 80 ShA |
Up to 6.0 m/s | −30 / +100 °C | Atmospheric No pressure |
| FKM Fluoroelastomer / Viton |
Up to 15.0 m/s | −20 / +200 °C | Atmospheric No pressure |
Mineral and synthetic greases, NLGI classes from 00 to 3, high-viscosity lubricating oils, water splashes and environmental dust.
Main features
Ribbed outer diameter
The wave-shaped rubber ribs deform in a controlled manner during insertion into the housing. The profile reduces the mechanical press-fitting force and limits the risk of scoring or damage to the housing.
Compensation for aluminium housings
The flexibility of the multi-wave outer profile compensates for thermal expansion of light-alloy housings, such as aluminium and magnesium, contributing to seal stability at high temperatures.
Low-friction springless lip
The lip uses the elastic interference of the vulcanized rubber against the shaft without the use of a garter spring. This configuration reduces frictional heat generation and is also suitable for non-case-hardened or non-hardened shafts.
Advantages of the GSM_w profile
Static sealing
The wave-shaped profile creates a series of barriers within the housing, improving static sealing even on surfaces with non-optimal roughness.
Easier installation
The ribbed profile facilitates insertion into the housing and counteracts the elastic rebound of the seal towards the outside immediately after mechanical press-fitting.
Optimized axial dimensions
The compact design, without the space required for a spring, allows the seal to be used in applications characterized by particularly limited axial space.
Typical applications
- Gearboxes, housings and speed reducers with aluminium or light-alloy housings and end covers
- Wheel hubs and oscillating joints for light agricultural machinery and motorcycles
- Grease-lubricated bearing supports in household appliances, pumps and fans
- Transmission shafts for small industrial and professional power tools
- Mechanical joints and rotary couplings in light automation applications
International standards
Construction dimensions, geometric tolerances and installation dimensions in compliance with international standards for springless radial shaft seals with wave-shaped outer surfaces: ISO 6194-1 Type 4 or DIN 3760 Form G.
Available configurations
GSM_w Standard
Standard configuration for grease retention in aluminium housings operating at medium temperatures. It combines installation flexibility with competitive cost.
GSM_w Premium
Specific configuration for applications exposed to high peripheral speeds, up to 15 m/s, or significant temperature fluctuations, particularly when the aluminium housing is subject to substantial thermal expansion.
Market equivalents
| Manufacturer | GSM_w Standard - NBR | GSM_w Premium - FKM / Viton |
|---|---|---|
| Net Seals | Springless Oil Seal Series GSM_w / G-w | Viton Springless Oil Seal Series GSM_w FKM |
| Freudenberg (Simrit) | Simmerring® G Wave Profile | G FKM Wave Profile |
| Trelleborg Sealing Solutions | Type G Ribbed Radial Profile | Type G Ribbed Viton Profile |
| Dichtomatik | WAG Wave Profile | WAG FKM Wave Profile |
| Corteco | Ribbed Grease Seal Series (NBR) | Ribbed Grease Seal Series FKM |