W61704ZZ Budget Metal Shielded Extra Thin Section Stainless Steel Deep Groove Ball Bearing 20x27x4mm

Stainless Steel Metal Shielded Thin Section Ball Bearings: One of the most commonly used bearings, these types are manufactured with metal shields inserted into the outer raceway, these fit in closely to the inner race providing protection against light mechanical damage, some protection against the ingress of moisture, dust and other foreign matter and serve to retain the pre-filled grease in the bearing.
Shields can be removed for applications that only require 1 shield
Benefits: Provides light mechanical protection, limits moisture and dirt ingress, lubricated for life, cost effective solution, resists corrosion, food safe and approved
Note: These bearings will eventually corrode in a marine environment and it is recommended to completely cover with grease or similar protection where practical. Due to the material requirements of these bearings to have a hard-wearing construction, they will be made of a harder form of Stainless Steel, such as 440 or similar, which will be attracted by magnets. Quotations for non-magnetic versions are available upon request.