High Precision Chrome Steel NA206-18GR3 Insert Ball Bearing
Short Description:
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The NA206-18GR3 insert ball bearing is a precision-engineered, ready-to-mount bearing unit designed for shaft diameters of 1-1/8 inch (28.575 mm), with an outside diameter of 62 mm and a total width of 48.3 mm. Built for equipment that runs continuously under dust, vibration and misalignment, it is the practical choice for conveyors, agricultural machinery, fans, and light industrial drive systems where reliable rotation matters more than complexity.
Construction and materials
Both the inner and outer rings, as well as the balls, are machined from GCr15 (AISI 52100) chrome steel, through-hardened to HRC 60–64 and precision ground to deliver low friction and long fatigue life. The spherical outer ring allows the bearing to self-align inside cast-iron pillow block, flange or take-up housings, absorbing shaft deflection and mounting error. Dual set screws (5/16-24 UNF) lock the inner ring firmly onto the shaft.
Sealing and lubrication
Each unit is fitted with synthetic rubber lip seals on both sides, retaining high-quality lithium-based grease for a wide operating temperature range and blocking dust, moisture and fiber ingress. The result is long maintenance intervals and stable performance in humid or dusty working environments.
With a dynamic load rating of approximately 19.5 kN and a static rating of about 11.2 kN, the NA206-18GR3 comfortably carries the radial loads typical of bulk handling and farm equipment. Every batch is inspected for vibration and noise before packing, and dimensional accuracy is verified against the catalogue to ensure drop-in replacement of original parts.
It is interchangeable with common 1-1/8 inch bore insert bearings used in P206, F206, FL206 and T206 housings.
OEM and Supply
As a factory-direct supplier — Ningbo Demai Electromechanical Co., Ltd., with production at Ningbo Juding Bearing Co., Ltd. — we support custom marking, private-label packaging, mixed-container orders and fast sampling. Standard sizes ship within 48 hours, and our engineering team helps you confirm clearance, sealing and housing fit before you commit to volume.
