RHP7216CTDULP4Super Precision Angular Contact Ball Bearing – Straight Bore, 80 mm ID, 140 mm OD, 26 mm Width, Open, 15° Contact Angle, Light Preload, ABEC 7

Product Description

What this part is

RHP 7216CTDULP4 single-row super-precision angular contact ball bearing, made in the United Kingdom. Bore: 80 mm. Outside Diameter: 140 mm. Overall Width: 26 mm. Contact Angle: 15°. Precision Class: P4, equivalent to ABEC 7 and to BS292 EP7. Number Of Rows: 1. Rolling Elements: Balls. Bearing Material: Carbon chrome bearing steel to BS970 534A99/535A99, equivalent to SAE 52100, through hardened. Series: 7200, ISO dimension series 02. RHP is an NSK brand.

Decoding the designation

Reading 7216-C-T-DUL-P4: 7 is a single-row angular contact ball bearing, 2 is ISO dimension series 02, the bore code 16 gives an 80 mm bore, C is the 15° contact angle, T is the laminated phenolic resin cage, DU marks a paired unit, L is light preload and P4 is the precision grade. The B-series form of the same bearing is B-7216-X2-TA-DUL-EP7, where X2 carries the 15° angle and EP7 the precision grade.

What these specs mean in practice

Dynamic Load Rating: 93.0 kN. Static Load Rating: 77.5 kN. Limiting Speed, oil-air lubrication: 15,200 rpm. Limiting Speed, grease lubrication: 9,200 rpm. Those figures are for a single bearing under light spring preload. Mounted as a back-to-back light-preload pair the limiting speeds are multiplied by 0.80, giving 12,160 rpm on oil-air and 7,360 rpm on grease. Oil-air lubrication carries away heat that grease cannot, which is the whole reason the two figures differ by so much.

Cage and temperature

Cage Material: Laminated phenolic resin. Cage Type: Outer-ring guided. Maximum Operating Temperature: 120 °C, set by the phenolic cage. A phenolic cage running against the outer ring land is light, damps well and tolerates marginal lubrication, which is why RHP makes it the standard cage across the super-precision range.

Preload and stiffness

Preload: Light. Axial Preload: 200 N for the mounted pair. Axial Stiffness: 109 N/µm. Light is the preload RHP selects most often, suiting applications where loads and speeds are not extreme. RHP publishes exactly four preload grades: extra light, light, medium and heavy.

Mounting data

Bore Type: Straight. Closure Type: Open. Minimum Shaft Abutment Diameter: 90 mm. Maximum Housing Abutment Diameter: 130 mm. Maximum Outer Ring Abutment Diameter: 134 mm. Chamfer r min: 2.5 mm. Chamfer r1 min: 1.0 mm. Effective Load Centre a: 27.7 mm. Internal Volume: 63.7 cm³. Pitch Circle Diameter Of Lubrication Jets: 102.8 mm. The rings are universally faced, so the bearing mounts back-to-back or face-to-face against its partner without altering the preload value.

Quantity and configuration

Unit Quantity: 1 Pc. Item Weight: 1.419 kg (3.15 lb). One bearing from a universally matched light-preload pair, carrying the DUL face grinding, so it pairs with another DUL 7216C to make up a set or runs as a universal single.

Interchange guidance

Cross-references on the same envelope, angle and preload: SKF 7216 CDGA/P4A, Fafnir 2MM216WI-DUL and 216HDL. The designation is also written 7216CTDULP4, 7216 C T DUL P4, B7216X2 and B-7216-X2-TA-DUL-EP7. A 7216 at a 25° contact angle shares this 80 x 140 x 26 mm envelope but carries different ratings and speeds, so it is a related size rather than a substitution.