RHPSuper Precision Angular Contact Ball Bearing – Matched Pair, Straight Bore, 65 mm ID, 120 mm OD, 23 mm Width, Open, 25° Contact Angle, Universal Light Preload, ABEC 7

Product Description

What this part is

RHP 7213A-T-DUL-P4 is a super-precision single-row angular contact ball bearing supplied as a universally ground duplex pair. Bore: 65 mm (2.559 in). Outside Diameter: 120 mm (4.724 in). Overall Width: 23 mm (0.906 in) per bearing. Total Width: 46 mm (1.811 in) for the pair. Series: 72 medium, ISO dimension series 02. Base Number: 7213. Bore Type: Straight. Closure Type: Open. Bearing Material: Through-hardened chrome bearing steel. Rolling Elements: Ball.

Decoding the designation

Series: ISO 72, bore code 13, giving a 65 mm bore. Contact Angle: 25°. Cage Material: Phenolic, laminated fabric. Cage Type: Outer-ring guided, machined. Arrangement / Configuration: Duplex, universally ground (DUL). Preload: Light. Precision Class: P4, equal to ABEC 7 and to the RHP EP7 carton code. The carton also carries the Fafnir designation 3MM213WI CR DUL and the RHP B-series form B7213X4-T-DU-EP7.

What these specs mean in practice

A 25° contact angle carries more thrust and less speed than a 15° bearing in the same envelope, which suits spindles and screw drives where axial load dominates. Light preload keeps running heat and torque low and gives the highest speed rating of the standard preload grades, while removing the internal play a normal-clearance bearing would leave under reversing load. The phenolic cage suits high surface speeds and holds oil in its fabric base. Max Temp: 120 °C. Lubricant: Oil or grease. P4 accuracy controls bore, outside diameter and raceway runout to super-precision tolerances, which is what holds spindle runout inside a few microns.

Load ratings and speed

Dynamic Load Rating: 88.0 kN per bearing. Static Load Rating: 56.0 kN per bearing. Permissible Axial Load: 46.5 kN. Limiting Speed: 10,900 rpm on grease and 16,300 rpm on oil or oil-air. Effective Load Centre: 33.1 mm. Chamfer Dimensions: r 1.5 mm minimum, r1 1.0 mm minimum. Item Weight: 1.00 kg (2.20 lb) per bearing.

Quantity and configuration

Unit Quantity: 2 Pcs, one universally ground duplex pair. Universal grinding lets the pair be assembled back-to-back, face-to-face or in tandem, with the light preload set by the ground ring offset once the faces are clamped solid. Internal Clearance: N/A — the set is preloaded.

Interchange guidance

Same-spec interchanges at 25° and light preload are SKF 7213 ACD/P4ADGA and Fafnir 3MM213WI CR DUL. Same-envelope bearings at a different contact angle — 7213 C at 15°, 7213 B at 40° — are related sizes, since the angle sets the thrust-to-speed balance. A 7213 at normal clearance rather than a ground preload is a different part.