RHPSuper Precision Angular Contact Ball Bearing – 40 mm ID, 80 mm OD, 18 mm Width, Open, 15° Contact Angle, Medium Preload, ABEC 7.

Product Description

What this part is

RHP 7208CTSUMP4 super precision angular contact ball bearing, ISO dimension series 02. Bore: 40 mm. Outside Diameter: 80 mm. Width: 18 mm. Contact Angle: 15°. Number of Rows: 1. Rolling Elements: steel balls. Bearing Material: carbon chrome bearing steel to SAE 52100. Bore Type: straight. Closure Type: open. Snap Ring Included: No. The bearing is preload-set at manufacture rather than clearance-set.

Decoding the designation

Series: 7200, ISO dimension series 02. Base Number: 7208. Contact Angle: 15°. Cage Material: laminated phenolic resin. Cage Type: machined, outer-ring guided. Grouping: SU, single universal. Preload: medium. Precision Grade: P4, equivalent to ABEC 7 and ISO Class 4. Searchable forms of the number include 7208CTSUMP4, 7208-C-T-SUM-P4, 7208 C T SUM P4, B7208X2TADUMEP7, 2MM208WICRDUM and 208HDM.

Load ratings and speed

Dynamic Load Rating: 36.5 kN (36 500 N) per bearing. Static Load Rating: 25.2 kN (25 200 N) per bearing. Limiting Speed, oil or oil-air lubrication: 30,600 rpm. Limiting Speed, grease lubrication: 18,900 rpm. Both speed figures are single-bearing values; a back-to-back pair at medium preload runs at 0.60 of the tabulated speed, a set of three at 0.50 and a set of four at 0.45. Face-to-face mounting takes a further 50 % reduction, and a spring-loaded tandem pair takes a 0.95 factor.

What these specs mean in practice

A 15° contact angle favours rotational speed and radial stiffness, while a 25° execution on the same envelope trades speed for thrust capacity. Axial Preload: 490 N paired, with the rest of the ladder at EL 100 N, L 200 N and H 980 N. Axial Stiffness: 90 N per micrometre paired, against EL 44, L 60 and H 126. Effective Load Centre: 17.0 mm. Lubricant: grease or oil. The laminated phenolic cage carries a maximum recommended operating temperature of 120 °C.

Mounting data

Inner Ring Abutment Diameter: 47 mm minimum. Outer Ring Abutment Diameter: 73 mm maximum. Housing Abutment Diameter: 75 mm maximum. Fillet Radius r min: 1.1 mm. Fillet Radius r1 min: 0.6 mm. Internal Volume: 15.5 cm³. Lubrication Jet Pitch Circle Diameter dT: 55.5 mm. Mass: 0.366 kg.

Quantity and configuration

Unit Quantity: 1 Pc. Universal face control means this bearing pairs with another of the same execution back-to-back or face-to-face at the rated preload, and shares load equally in tandem.

Interchange guidance

Cross-Reference: SKF 7208 CDGB/P4A. Cross-Reference: FAG B7208-C-T-P4S-UM. The RHP B-series form is B7208X2TADUMEP7, where X2 is the 15° contact angle and TA the one-piece machined laminated phenolic cage, outer-ring centred. The Fafnir cross is 2MM208WICRDUM. A 7208A5 shares the 40 x 80 x 18 mm envelope at a 25° contact angle, making it a related size rather than a direct substitution.