RHP7216CTDULP4-1/2PRSuper Precision Angular Contact Ball Bearing, 80 x 140 x 26 mm, 15° Contact Angle, Phenolic Cage, P4 ABEC 7, Light Preload, Universally Ground

Product Description

What this part is

RHP 7216CTDULP4 super-precision single-row angular contact ball bearing for machine-tool spindles. Bore: 80 mm. Outside Diameter: 140 mm. Overall Width: 26 mm. Contact Angle: 15°. Precision Class: P4, equal to BS292 EP7, ABEC 7 and ISO 492 Class 4. Series: 72, ISO dimension series 02. Cage Material: laminated phenolic resin. Cage Type: machined, outer-ring guided. Bearing Material: through-hardened high 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. Mounting Arrangement: universal. Unit Quantity: 1 Pc. The bearing is preload-set at manufacture rather than clearance-set.

Published ratings

Dynamic Load Rating Cr: 93.0 kN (93,000 N). Static Load Rating C0r: 77.5 kN (77,500 N). Limiting Speed: 15,200 rpm on oil/air lubrication and 9,200 rpm on grease. Axial Preload: light (L), 590 N as a paired set, with EL 295 N, M 1,370 N and H 2,750 N. Axial Stiffness: 109 N/µm for a light-preload pair, against EL 83, M 159 and H 224. Maximum Operating Temperature: 120°C, set by the phenolic cage. Lubricant: grease or oil.

Decoding the designation

72: ISO dimension series 02. 16: bore code, 80 mm bore. C: 15° contact angle in the RHP scheme. T: laminated phenolic resin cage, outer-ring guided. DU: duplex, universally ground. L: light preload. P4: ABEC 7 precision, which buys tighter running accuracy, lower running vibration and closer shaft location. -1/2PR: 1 Pc, the single-piece sale unit. Searchable forms: 7216CTDULP4, 7216-C-T-DUL-P4, 7216 C T DUL P4, 7216CTDUL, B7216X2, 7216C, 7216.

What these specs mean in practice

A 15° contact angle favours speed and low running heat; a 25° angle of the same envelope favours axial stiffness and thrust capacity at a lower speed ceiling. Light preload is the class RHP describes as most frequently selected, suited to moderate load and speed duty; medium and heavy preloads add rigidity, reduce speed capability and generate more heat. Speed derating against the single-bearing limiting speed, light preload: back-to-back pair 0.80, set of three 0.65, set of four 0.60. Medium preload pair 0.60, heavy preload pair 0.40. Face-to-face mounting reduces those factors by a further 50 %, and a spring-loaded tandem pair takes a 0.95 factor. The outer-ring-guided laminated phenolic cage is light, runs quietly, damps vibration and holds oil, and it sets the 120°C ceiling.

Quantity and configuration

Unit Quantity: 1 Pc. One bearing, half of a duplex pair. Arrangement / Configuration: DU, universally ground. The ring faces are ground so that any two bearings of this designation clamp together to the specified light preload back-to-back (DB), face-to-face (DF) or in tandem (DT), with catalogue-standard spacing. Two of these make a complete DUL pair.

Mounting data

Effective Load Centre a: 27.7 mm. Chamfer r min: 2.5 mm. Chamfer r1 min: 1.0 mm. Shaft Abutment Diameter d1 min: 90 mm. Housing Abutment Diameter D1 max: 130 mm. Housing Abutment Diameter D2 max: 134 mm. Internal Free Volume: 63.7 cm³. Lubrication Jet Pitch Circle Diameter dT: 102.8 mm. Item Weight: 1.419 kg (3.13 lb). Each bearing is marked at its high point of radial runout: a small circle or burnished spot on the inner ring face and a V line on the outer ring outside diameter, and the V line points in the direction of the contact angle. RHP marks the deviation from nominal bore and outside diameter in microns on each ring face, with the grade repeated on the box end.

Interchange guidance

The RHP bearing line was absorbed by NSK, and the NSK form of this designation is 7216CTRDULP4. Carton designation retained: B7216X2, in which X2 is the RHP B-series code for a 15° contact angle, an independent confirmation of the C suffix. Same-envelope 15° super-precision equivalents at 80 x 140 x 26 mm: SKF 7216 CDGA/P4A and FAG B7216-C-T-P4S-UL. Internal designs and load ratings differ between makers. Related builds on the same envelope: 7216CTDUMP4 at medium preload, 7216CTDUHP4 at heavy preload, and 7216CTSULP4 as a single universally ground bearing. 7216A5TDULP4 is the 25° build, a related size rather than an angle-for-angle equivalent.