RHP7018CTDULP4Super Precision Angular Contact Ball Bearing – 90 mm ID, 140 mm OD, 24 mm Width, Open, 15° Contact Angle, Light Preload, Matched Pair

Product Description

What this part is

RHP 7018CTDULP4 super precision angular contact ball bearing set. Bore: 90 mm. Outside diameter: 140 mm. Width: 24 mm per bearing. Series: 70, ISO dimension series 10. Single-row angular contact ball bearings, open, supplied as a universally matched duplex pair.

Decoding the designation

Contact Angle: 15°. Cage: machined laminated phenolic, outer-ring guided. Arrangement: DU universally matched pair. Preload: Light, 490 N axial. Precision Grade: P4, equivalent to EP7, ABEC 7 and ISO Class 4. The same bearing carries the designations 2MM9118WI CR DUL and B7018X2TADULEP7.

What these specs mean in practice

Dynamic radial load rating (Cr): 71,500 N. Static radial load rating (C0r): 69,000 N. Axial stiffness as a light-preload pair: 117 N/µm. A 15° contact angle favours speed and rotational accuracy over thrust capacity, which suits machine-tool spindles running at high rpm. Limiting speed for a single bearing: 14,600 rpm on oil/air, 8,700 rpm on grease. As a light-preload back-to-back pair the oil/air figure is 11,680 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): 99 mm minimum. Housing abutment diameters: D1 131 mm maximum, D2 134 mm maximum. Maximum shaft fillet radius: 1.5 mm. Maximum housing fillet radius: 1.0 mm. Effective load centre (a): 108.6 mm. Internal volume for grease charging: 49.3 cm³ per bearing. Mass: 1.16 kg per bearing. 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; the V line also shows the direction of the contact angle.

Interchange guidance

Crosses at the same contact angle, preload and precision class: NSK 7018CTRDULP4, Timken Fafnir 2MM9118WI CR DUL, SKF 7018 CD/P4ADGA, FAG B7018-C-T-P4S-DUL. The 25° version of the same envelope, 7018A5TRDULP4, is a related size.