RHP7208CTDUXP4Super Precision Angular Contact Ball Bearing – Straight Bore, 40 mm ID, 80 mm OD, 18 mm Width, Open, 15° Contact Angle, ABEC 7 / P4, Universally Ground

Product Description

What this part is: RHP 7208CTDUXP4-1/2PR super-precision single-row angular contact ball bearing. Bore: 40 mm. Outside Diameter: 80 mm. Width: 18 mm. Contact Angle: 15°. Precision Class: P4, equivalent to ABEC 7 and ISO Class 4. Dynamic Load Rating: 36.5 kN. Static Load Rating: 25.2 kN. Cage Material: Laminated phenolic resin. Cage Type: Outer ring guided. Bore Type: Straight. Closure Type: Open. Rolling Elements: Steel balls. Number Of Rows: 1. Series: 7200, ISO dimension series 02. Bearing Material: Through-hardened carbon chrome bearing steel to SAE52100. Decoding the designation: 7208 is the type and size: single-row angular contact, ISO dimension series 02, bore code 08 for a 40 mm bore. C sets the contact angle at 15°. T is the outer-ring-guided laminated phenolic resin cage. DU marks a universally ground paired unit. P4 is the precision grade. The trailing 1/2PR identifies one bearing out of that pair. Searchable variants of the number: 7208C, 7208-C-T-DUX-P4, 7208 CT DUX P4, 7208X2TADUXEP7, 2MM208WI CR DUX. What these specs mean in practice: Limiting Speed: 30,600 r/min on oil-air lubrication and 18,900 r/min on grease. The two figures are the published pair for a single bearing under light external load, and the gap between them is why the lubrication method is chosen before the bearing is. A 15° contact angle favours speed and radial stiffness, where the 25° 7208A5 in the same envelope runs 26,800 r/min on oil-air and carries a lower dynamic rating of 34.5 kN in exchange for more thrust capacity. Lubricant: grease or oil. Maximum operating temperature for a laminated phenolic resin cage is 120 °C. Item weight: 0.366 kg (0.81 lbs). Mounting dimensions: Shaft abutment diameter d1: 47 mm minimum. Housing abutment diameter D1: 73 mm maximum. Outer ring abutment D2: 75 mm maximum. Chamfer r: 1.1 mm minimum. Chamfer r1: 0.6 mm minimum. Effective Load Centre a: 17.0 mm. Internal volume: 15.5 cm³, the figure grease quantity is calculated from. Bearing tolerances are to P4: bore deviation −5 µm, outside diameter deviation −5 µm, radial runout of the assembled inner ring 4 µm, radial runout of the assembled outer ring 5 µm. Quantity and configuration: Unit Quantity: 1 Pc. One bearing from a universally ground pair. Universal face control means the inner and outer rings are the same width and the relative positions of the faces are adjusted at manufacture, so it combines back-to-back, face-to-face or in tandem with another bearing of the same designation without ground spacers, sharing load equally in tandem. The high point of radial runout is marked with a burnished spot on the inner ring face and a V line on the outer ring diameter, and the V line also indicates the direction of the contact angle. Interchange guidance: Cross-references: SKF 7208 CD/P4A, FAG B7208-C-T-P4S, Fafnir 2MM208WI CR. Each names the 15° super-precision execution in its own maker’s scheme, so all three are like-for-like on angle, envelope and precision. The 25° 7208A5 shares the same 40 x 80 x 18 mm envelope and is a related size rather than a substitution, since angle sets both the thrust capacity and the speed limit.