RHP7213CTRDULP4Super Precision Angular Contact Ball Bearing – Matched Pair, Straight Bore, 65 mm ID, 120 mm OD, 23 mm Width, Open, 15° Contact Angle, Universal Light Preload, ABEC 7

Product Description

What this part is

RHP 7213CTRDULP4 is a super precision single-row angular contact ball bearing supplied as a universally matched pair. Bore: 65 mm. Outside diameter: 120 mm. Width: 23 mm per bearing, 46 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 7213CTRDULP4, 7213-C-TR-DUL-P4, 7213 C TR DUL P4 and 7213CTRDULP4Y.

Decoding the designation

Type: single-row angular contact ball bearing. Dimension Series: 02. Bore Code: 13, giving a 65 mm bore. Contact Angle: 15°. Cage: TR, an outer-ring-guided machined laminated phenolic cage. 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: 73.0 kN per bearing. Static Load Rating: 58.5 kN per bearing. Light preload sets 440 N of axial preload across the pair and gives 95 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 5 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: 15,000 rpm with oil/air lubrication and 9,200 rpm with grease. Mounted face-to-face those figures halve. Grease fill for a low or medium speed spindle is 30% of the 41.1 cm³ internal volume, 20% above 60% of maximum speed, and 10 to 15% above 80%. Lubrication jet pitch circle diameter: 86.2 mm.

Quantity and configuration

Unit Quantity: 2 Pcs, one universally matched pair. 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: 23.9 mm. Abutment diameters: shaft shoulder d1 74 mm minimum, housing shoulder D1 111 mm maximum, seal counterbore D2 114 mm maximum. Fillet radii: r 1.5 mm, r1 1.0 mm. Recommended shaft fit at 65 mm is a mean interference of 3 µm; recommended housing fit at 120 mm for a locating bearing is a mean clearance of 5 µm. Mass: 1.007 kg per bearing.

Interchange guidance

Direct equivalents at the same envelope, angle, cage and preload: SKF 7213 CD/P4DGA, FAG B7213-C-T-P4S-DUL, Fafnir 2MM213WI CR DUL and NSK 7213CTRDULP4. RHP 7213A5 is the 25° bearing in the same envelope and is a related size, not an interchange.