RHP7211ETSUMP4Super-Precision Angular Contact Ball Bearing – Straight Bore, 55 mm ID, 100 mm OD, 21 mm Width, Open, 25° Contact Angle, ABEC 7, Medium Preload

Product Description

What this part is: RHP 7211ETSUMP4 super-precision angular contact ball bearing, 72 dimension series, 55 mm bore x 100 mm outside diameter x 21 mm width. Bore: 55 mm. Outside Diameter: 100 mm. Overall Width: 21 mm. Bore Type: Straight. Number Of Rows: 1. Rolling Elements: Balls. Closure Type: Open. Contact Angle: 25°. Precision Class: ABEC 7 (RHP EP7 / ISO Class 4). Preload: Medium. Cage Material: Machined laminated phenolic. Cage Type: Machined, outer-ring guided. Design Units: Metric. Country of Origin: United Kingdom. Decoding the designation: 7211 gives the 72 dimension series and a 55 mm bore. E: 25° contact angle. T: machined laminated phenolic cage, outer-ring guided. SU: single bearing with universally ground faces, so any two or more pieces of the same designation assemble back-to-back, face-to-face or in tandem. M: medium preload. P4: RHP EP7, equal to ISO tolerance class 4 and ABEC 7. Searchable variants: 7211E, 7211-E-T-SUM-P4, 7211 E T SUM P4, B7211X3TADUMEP7, 3MM211WI-CR-SUM. What these specs mean in practice: Dynamic Load Rating: 63.5 kN. Static Load Rating: 38.0 kN. Permissible Axial Load: 32.5 kN. Limiting Speed, oil or oil-air lubrication: 19,400 rpm. Limiting Speed, grease lubrication: 13,000 rpm. Effective Load Centre: 28.6 mm. Item Weight: 0.596 kg (1.31 lb). The 72 heavy section puts a larger ball complement in the same bore as a 70-series bearing, so the dynamic rating is high for the shaft size. A 25° contact angle carries more thrust and less speed than a 15° execution. Medium preload raises axial rigidity to 256 N/µm in a back-to-back or face-to-face pair, which holds a spindle position tightly under changing thrust. Lubricant: grease or oil. Maximum Operating Temperature: 120 °C. Minimum Operating Temperature: -30 °C. Material: Chrome bearing steel. Quantity and configuration: Unit Quantity: 1 Pc. Arrangement: single bearing, universally ground faces. Two or more universally ground pieces of this designation combine to give medium preload in a back-to-back, face-to-face or tandem set. Internal Clearance: N/A — face grinding sets the axial position on a universally ground preloaded execution, in place of a radial clearance class. Fitting notes: Chamfer Dimension: 1.5 mm minimum bore side, 1 mm minimum outer side. Measured axial clearance at medium preload: -26 µm. Interchange guidance: Same-specification equivalents: NSK 7211A5TRSUMP4, SKF 7211 ACD/P4DGB, FAG B7211-E-T-P4S-UM, Fafnir 3MM211WI-CR-SUM. RHP B-series designation: B7211X3TADUMEP7. A 7211C execution shares the 55 x 100 x 21 mm envelope at a 15° contact angle, which is a related size rather than a substitution.