Fafnir3MM203WI-DULSuper-Precision Angular Contact Ball Bearing Matched Pair – Straight Bore, 17 mm ID, 40 mm OD, 12 mm Width, Open, 25° Contact Angle, Light Preload, Machined Phenolic Cage.

Product Description

What this part is: Fafnir 3MM203WI-DUL matched duplex pair of super-precision angular contact ball bearings, 200 series. Brand: Fafnir (Timken). Part Number: 3MM203WI-DUL. Bore: 17 mm. Outside Diameter: 40 mm. Overall Width: 12 mm per bearing. Design Units: Metric. Number Of Rows: 1 per bearing. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Bearing Material: Chrome bearing steel. Item Weight: 0.15 lbs. Decoding the designation: Contact Angle: 25°. Precision Class: P4S. Precision Rating: ABEC 7/9. Cage Material: Phenolic. Cage Type: Machined, outer-ring land-riding. Preload: Light. Arrangement / Configuration: Matched duplex pair, universally ground. Series: 200, carrying the ISO 7203 envelope. The 3MM prefix marks the 25° super-precision execution, which is why the carton also carries the 7203-E, 7203ACD and 7203A5 equivalents. What these specs mean in practice: Dynamic Load Rating: 10.1 kN. Static Load Rating: 5.3 kN. Limiting Speed: 38000 rpm. A 25° contact angle carries more thrust and locates the shaft more stiffly along its axis than a 15° bearing on the same envelope. The light preload class keeps friction and heat generation low, which is what allows the high permissible speed on a 17 mm bore. The machined phenolic cage rides on the outer ring land, staying centred at speed and holding lubricant against the ball pockets. Max Temp: 120°C. Min Temp: -30°C. Internal Clearance: N/A — the pair is set by preload rather than by clearance. Quantity and configuration: Unit Quantity: 2 Pcs. Mounting Arrangement: Universal. The two bearings are ground as a matched set, so mounting them against one another produces the light preload class directly, with no shims and no regrinding. Universal grinding also allows a back-to-back, face-to-face or tandem stack. Total Width: 24 mm for the pair as mounted. Interchange guidance: Cross-References: SKF 7203 ACD/P4ADGA, FAG B7203-E-T-P4S-DUL, NSK 7203A5TYNDULP4, Timken 7203ACD. Each is a 25° light-preload duplex set on the 17 x 40 x 12 mm envelope. Harmonization Code: 8482.10.50.68. Designation variants: MPN Variants: 3MM203WI-DUL, 3MM203WIDUL, 3MM 203 WI DUL, 3MM-203-WI-DUL, 3MM-203-WI-CR-DUL, 7203-E, 7203-A, 7203ACD, 7203A5, 3MM203WI.