SS 626 ZZ/2RS stainless steel deep groove ball bearings

Thickened Structure Designed for Load Capacity: For applications requiring the support of vertical gravity (such as hanging doors or heavy-duty drawers), ordinary miniature bearings are prone to deformation due to metal fatigue. SS 626, made from reinforced AISI 440C/420 martensitic stainless steel and vacuum-hardened, easily withstands the long-term pressure of heavy door panels, resisting dents and wear.

Outdoor-Grade Weather Resistance: Designed for exposed environments such as balcony doors and windows or marine deck hardware:

AISI 316 (L): Offers top-tier resistance to salt spray corrosion, making it the only recommended material for seaside villa doors and windows and yacht pulleys.

AISI 304: A cost-effective choice, perfectly suited for bathroom moisture and everyday rain.

Smooth and Quiet Rolling Experience: The "feel" of sliding doors and windows determines the quality of the product. We use G10 grade high-roundness steel balls and finely milled grooves to greatly reduce frictional resistance during rolling, eliminating the "clunk" sound and making every push and pull a pleasant experience.

Waterproof and dustproof sealing upgrade: 2RS (contact rubber): Prevents sand and cement dust from entering the raceway, locks in the internal long-lasting lithium-based grease, and achieves lifetime maintenance-free operation.

"The ultimate solution to 'rust and jamming'." We understand that the biggest pain point for pulley manufacturers is customer complaints caused by bearing rust. Therefore, we implement a rigorous salt spray test standard for SS 626. For products made of 304/316 stainless steel, we promise that they will pass a 72-168 hour salt spray test without developing red rust. In addition, for injection molding overmolding (bearings encased in plastic), we offer high-temperature grease options to ensure that the grease does not leak or carbonize under the high temperatures of injection molding, guaranteeing the quality of the finished product.