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1.25x1.5x0.25 inch Metal Cased Nitrile Rubber Rotary Shaft Oil Seal Springless Design VB Style
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| Shaft Size not Inside Diameter (d) | = | 31.75mm = 1.25 (1-1/4) inch |
| Outside Diameter (D) | = | 38.1mm = 1.5 (1-1/2) inch |
| Width (b) | = | 6.35mm = 0.25 (1/4) inch |
Cross section of an R12 / VB style oil seal. This is a single sealing lip seal arrangement. 
An oil seal normally consists of three basic components: The Sealing Element (the nitrile rubber part), the Metal Case, and the Spring. It is a widely used sealing component. The function of a seal is to prevent the leakage of medium along the moving parts. This is mainly achieved by the sealing element. Nitrile Rubber (NBR)
NBR is the most commonly used seal material. It has good heat resistance properties, good resistance to oils, salt solutions, hydraulic oils, and gasoline. Operation temperatures are recommended from -40deg C to 120deg C. It also functions well under dry environment, but only for intermittent periods.
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