RHP7020ETDULP4Super Precision Angular Contact Ball Bearing – 100 mm ID, 150 mm OD, 24 mm Width, Open, 25° Contact Angle, Light Preload, Matched Pair

Product Description

What this part is

RHP 7020ETDULP4 super precision angular contact ball bearing set. Bore: 100 mm. Outside diameter: 150 mm. Width: 24 mm per bearing. Series: 70, ISO dimension series 10. Two single-row angular contact ball bearings, straight bore, open, supplied as a universally matched duplex pair.

Decoding the designation

Contact Angle: 25°. Cage: machined laminated phenolic, outer-ring guided. Arrangement: DU, universally matched pair. Preload: Light, 830 N axial. Precision Grade: P4, equivalent to EP7, ABEC 7 and ISO Class 4. The same bearing carries the designations B7020TADULEP7, 3MM9120WI CR DUL, 7020A5 and 7020ACD.

What these specs mean in practice

Dynamic radial load rating (Cr) per bearing: 71,000 N. Static radial load rating (C0r) per bearing: 73,500 N. Axial stiffness as a light-preload pair: 299 N/µm. A 25° contact angle carries more thrust and gives greater axial stiffness than a 15° bearing in the same envelope, at a lower speed ceiling. The 70 dimension series is the medium section, which balances load capacity against a slim 24 mm width at a 100 mm bore. Limiting speed for a single bearing: 11,800 rpm on oil/air, 7,600 rpm on grease. As a light-preload back-to-back pair the oil/air figure is 9,440 rpm. Maximum recommended operating temperature: 120 °C. Rings and balls are through-hardened carbon chrome bearing steel to SAE 52100.

Quantity and configuration

2 Pcs, one universally matched duplex pair, sold together. Universal face control means the ring faces are adjusted at manufacture, so the light preload is achieved by clamping the rings together and the pair may be mounted back-to-back, face-to-face or in tandem at the same preload value.

Fitting notes

Shaft abutment diameter (d1): 109 mm minimum. Housing abutment diameters: D1 141 mm maximum, D2 144 mm maximum. Maximum shaft fillet radius: 1.5 mm. Maximum housing fillet radius: 1.0 mm. Effective load centre (a): 118.6 mm. Internal volume for grease charging: 53.4 cm³ per bearing. Mass: 1.26 kg per bearing. Recommended shaft fit at P4 is a mean interference of 5 µm at this diameter, and a locating housing runs a mean clearance of 5 µm. The high point of radial runout is marked by a burnished spot on the inner ring face and by a V line on the outer ring outside diameter.

Interchange guidance

Equivalents at the same contact angle, preload and precision class: SKF 7020 ACD/P4ADGA, FAG B7020-E-T-P4S-DUL, NSK 7020A5TRDULP4, Timken Fafnir 3MM9120WI CR DUL. Related sizes on the same 100 x 150 x 24 mm envelope: RHP 7020CTRDULP4 at 15°, and NSK 7020A at 30°.