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

Product Description

What this part is

RHP 7216CTDULP4 is a super precision single-row angular contact ball bearing supplied as a universally matched pair. Bore: 80 mm. Outside diameter: 140 mm. Width: 26 mm per bearing, 52 mm for the pair. Series: 7200, ISO dimension series 02. Contact Angle: 15°. Precision Class: ISO Class 4, equal to RHP P4, BS292 EP7 and ABEC 7. Searchable forms of the designation include 7216CTDULP4, 7216-C-T-DUL-P4, 7216 C T DUL P4, B7216X2TADUEP7 and B-7216-X2-TA-DU-EP7.

Decoding the designation

Type: single-row angular contact ball bearing. Dimension Series: 02. Bore Code: 16, giving an 80 mm bore. Contact Angle: 15°. Cage: T, a machined laminated phenolic cage guided by the outer ring. Grouping: DU, a matched pair. Preload: L, light. Precision Grade: P4.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness over thrust capacity. Dynamic Load Rating: 93.0 kN per bearing. Static Load Rating: 77.5 kN per bearing. Light preload sets 590 N of axial preload across the pair and delivers 109 N/µm of axial stiffness, which holds shaft position under cutting load while keeping heat generation low. P4 accuracy holds inner-ring radial runout to 4 µm and outer-ring radial runout to 7 µm, lowering runout and vibration at the tool. The laminated phenolic cage runs to 120 °C and is quiet at speed. Rings and balls are SAE 52100 chrome bearing steel, through hardened and heat treated for dimensional stability.

Speed and lubrication

Limiting speed as a back-to-back light-preload pair: 12,160 rpm with oil/air lubrication and 7,360 rpm with grease. Mounted face-to-face those figures halve. Grease fill for a low or medium speed spindle is 30% of the 63.7 cm³ internal volume, 20% above 60% of maximum speed, and 10 to 15% above 80%. Lubrication jet pitch circle diameter: 102.8 mm.

Quantity and configuration

Unit Quantity: 2 Pcs, one universally matched pair of single-row bearings. Universal face control means the pair mounts back-to-back, face-to-face or in tandem at the same preload, with no ground spacers required. The high point of radial runout is marked by a burnished spot on the inner ring face and a V line on the outer diameter; the V also shows the direction of the contact angle.

Fitting notes

Effective load centre a: 27.7 mm. Abutment diameters: shaft shoulder d1 90 mm minimum, housing shoulder D1 130 mm maximum, seal counterbore D2 134 mm maximum. Fillet radii: r 2.5 mm, r1 1.0 mm. Mass: 1.419 kg per bearing. Recommended shaft fit at 80 mm is a mean interference of 3 µm; recommended housing fit at 140 mm for a locating bearing is a mean clearance of 6.5 µm.

Interchange guidance

Equivalents at the same envelope, 15° angle and light preload: SKF 7216 CD/P4ADGA, Fafnir 2MM216WI CR DUL and RHP B-series B7216X2TADUEP7. RHP 7216A5 is the 25° bearing in the same envelope and is a related size.