Synertech Stock
Grease seals GSM
GSM Grease Seal is a type of sealing ring, specifically an oil seal, used to prevent the leakage of grease or other lubricants from machinery or moving components.
Product codes
Details
The GSM series grease seals are rotary seals designed for the retention of high-density and high-viscosity lubricating greases within moving mechanical components. The profile features an internal "L"-shaped reinforcing metal insert, completely vulcanized into the elastomer, and a reinforced springless dynamic lip. This configuration provides reduced axial dimensions and controlled friction.
GSM Standard
Profile with an angular metal insert completely covered in rubber, a smooth or ribbed outer diameter and a short, flexible radial sealing lip.
GSM Mirrored / Dual Function
Geometric variant suitable for use as a bidirectional barrier when installed in back-to-back pairs, allowing the separation of two different fluids or greases.
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 lubricating greases, NLGI classes from 00 to 3, high-viscosity mineral oils, atmospheric agents and environmental moisture.
Main features
No garter spring
The lip uses the elastic memory of the elastomer and calibrated radial interference against the shaft. The absence of a spring reduces overall friction and localized heat generation.
Internal "L"-shaped metal casing
The stamped steel structural insert is completely embedded and vulcanized into the elastomer, providing the geometric rigidity required for stable press-fitting and protecting the reinforcement against corrosion.
Ultra-thin axial section
The compact design, without the space required for a garter spring, reduces the width of the seal and allows installation in particularly limited axial spaces.
Advantages of the GSM profile
Reduced breakaway torque
The absence of radial spring preload reduces the power absorbed by friction during start-up, limiting localized wear even on non-case-hardened or relatively soft metal shafts.
Rubber-covered static fit
The rubber-covered outer diameter adapts to the housing, compensating for structural thermal expansion and micro-roughness of the housing surface.
Protection against light contamination
In addition to retaining the internal grease, the geometry and orientation of the dynamic lip contribute to protection against light water splashes, environmental dust and contaminants.
Typical applications
- Grease-lubricated ball or roller bearing supports and industrial joints
- Wheel hubs for light agricultural trailers, carts and gardening equipment
- Intermediate shafts, oscillating bushings and mechanical joints in self-propelled machinery
- Small electric motors, portable tools and miniature gearboxes
- Cardan shafts and transmission joints in automotive and industrial applications
International standards
Construction dimensions, geometric tolerances and installation dimensions in compliance with international standards for springless radial shaft seals: ISO 6194-1 Type 4 or DIN 3760 Form G.
Available configurations
GSM Standard
Universal and cost-effective configuration for grease protection and retention in industrial and agricultural mechanical components operating at medium-low rotational speeds.
GSM Premium
Specific configuration for applications exposed to high peripheral speeds, up to 15 m/s, or significant temperature fluctuations generated by friction or proximity to motors.
Market equivalents
| Manufacturer | GSM Standard - NBR | GSM Premium - FKM / Viton |
|---|---|---|
| Net Seals | Springless Oil Seal Series GSM / G | Viton Springless Oil Seal Series GSM FKM |
| Freudenberg (Simrit) | Simmerring® G Profile / Static | G FKM Profile |
| Trelleborg Sealing Solutions | Type G Radial Profile | Type G Viton Profile |
| Dichtomatik | WAG Profile | WAG FKM Profile |
| Corteco | Standard Grease Seal Series (NBR) | FKM High-Temp Grease Seal Series |
| SKF | HMS4 Radial Shaft Seals (springless) | — |