RHPSuper Precision Angular Contact Ball Bearing 70 x 150 x 35 mm, 15° Contact Angle, Light Preload, Single Universally Ground, Machined Phenolic Cage, P4 ABEC 7

Product Description

What this part is

A super-precision single-row angular contact ball bearing in the heavy ISO dimension series 03. Bore: 70 mm. Outside Diameter: 150 mm. Overall Width: 35 mm. Contact Angle: 15°. Precision Class: RHP P4, equal to BS292 EP7, ABEC 7 and ISO 492 Class 4. Series: 73, ISO dimension series 03. Cage Material: laminated phenolic resin. Cage Type: machined, outer-ring guided. Bearing Material: through-hardened carbon chrome bearing steel to BS970 534A99/535A99, equivalent to SAE 52100. Bore Type: straight. Closure Type: open. Snap Ring Included: No. Number Of Rows: 1. Rolling Elements: steel balls. Preload: light (L). Mounting Arrangement: universal face control. Unit Quantity: 1 Pc. Maximum Operating Temperature: 120°C. The bearing is preload-set at manufacture rather than clearance-set, and it is universally ground, so it combines with like bearings in any arrangement at the catalogue preload.

Decoding the designation

73: ISO dimension series 03, the heavy angular contact series, carrying more load capacity and stiffness than a 72xx or 70xx of the same bore. 14: bore reference, 70 mm. C: 15° contact angle. T: laminated phenolic resin cage, outer-ring guided. SU: single, universally ground. L: light preload. P4: RHP class P4, equal to ABEC 7 and ISO Class 4. Searchable forms: 7314CTSULP4, 7314-C-T-SUL-P4, 7314 C T SUL P4, 7314CTSUL, 7314C, 7314.

Quantity and configuration

Unit Quantity: 1 Pc, one bearing. Arrangement / Configuration: SU, single universally ground, light preload. Universal facing means this bearing pairs or stacks back-to-back (DB), face-to-face (DF) or in tandem (DT) with the light preload preserved, and bearings mounted in tandem share load equally. SUL and DUL are ground to different face relationships, so a defined-preload stack is built from one grinding class throughout.

What these specs mean in practice

The 15° contact angle keeps ball contact nearer the radial plane, favouring speed and low heat generation at the cost of axial stiffness and thrust capacity; a 25° bearing trades the other way. Light preload is RHP’s most-selected level and suits applications where loads and speeds are not extreme.

Preload and arrangement set the speed ceiling as much as size does. Against a single bearing’s limiting speed, RHP derates a light-preload back-to-back pair to 0.80, a set of three to 0.65 and a set of four to 0.60; a face-to-face arrangement is reduced by a further 50 %, and a spring-loaded tandem pair takes a factor of 0.95. Medium preload drops the pair factor to 0.60, and heavy to 0.40. The tabulated speeds assume a premium high-speed synthetic grease, and RHP quotes a factor of 1.00 for Klüber Isoflex NBU 15 against 0.83 for Super LDS 18, Topas NB 52 and NCA 15.

The outer-ring-guided laminated phenolic cage is light, stable at speed, quiet and oil-retaining, and it sets the 120°C maximum operating temperature. Lubricant: grease or oil.

Mounting data

The high point of radial runout is marked: a small circle or burnished spot on the inner ring face and a V line on the outer ring outside diameter. The V line also indicates the direction of the contact angle. Deviation from nominal bore and outside diameter is marked in microns on the ring face and repeated on the box end. Recommended shaft fit for P4 at 70 mm: limits +3/-2 µm, mean interference about 3T. Recommended housing fit for a locating bearing at 150 mm: limits +7/-3 µm, mean clearance about 7C; for a sliding position, +17/+7 µm.

Interchange guidance

RHP belongs to the NSK Group, so current-production equivalents are numbered as NSK, and searches for obsolete RHP spindle bearings should include both names. The NSK form of this designation is 7314CTRSULP4, where TR is the outer-ring-guided phenolic cage. Same-envelope options from other makers at 70 x 150 x 35 mm are SKF 7314 CD/P4A and FAG B7314-C-T-P4S-UL, both universally matchable singles at 15°. A 7314A or 7314AC is the 25° build on the same envelope, and a 7314B is the 40° standard-precision build; both are related sizes rather than angle-for-angle equivalents. The same suffix letter denotes different angles across brands, so the angle code decides interchange rather than the base number.