RHP7214CTDUMP5Super Precision Angular Contact Ball Bearing – Matched Pair, Straight Bore, 70 mm ID, 125 mm OD, 24 mm Width, Open, 15° Contact Angle, Universal Medium Preload, ABEC 5

Product Description

What this part is

RHP 7214CTDUMP5 is a super precision single-row angular contact ball bearing supplied as a universally matched pair. Bore: 70 mm. Outside diameter: 125 mm. Width: 24 mm per bearing, 48 mm for the pair. Series: 7200, ISO dimension series 02. Contact Angle: 15°. Precision Class: RHP P5, equal to BS292 EP5 and ABEC 5. Searchable forms of the designation include 7214CTDUMP5, 7214-C-T-DUM-P5, 7214 C T DUM P5, 7214C and B7214X2-TA-DUM-EP5.

Decoding the designation

Type: single-row angular contact ball bearing. Dimension Series: 02. Bore Code: 14, giving a 70 mm bore. Contact Angle: 15°. Cage: T, a machined laminated phenolic cage guided by the outer ring. Grouping: DU, a matched pair. Preload: M, medium. Precision Grade: P5.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness over thrust capacity. Dynamic Load Rating: 79.5 kN per bearing. Static Load Rating: 64.5 kN per bearing. Medium preload sets 1,180 N of axial preload across the pair and delivers 148 N/µm of axial stiffness, holding shaft position tightly under heavier cutting load at the cost of speed and heat headroom. P5 accuracy tightens running accuracy over standard tolerance, which lowers runout and vibration in a spindle. 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 medium-preload pair: 10,500 rpm with oil/air lubrication and 6,480 rpm with grease. Mounted face-to-face those figures halve. Grease fill for a low or medium speed spindle is 30% of the 47.5 cm³ internal volume, 20% above 60% of maximum speed, and 10 to 15% above 80%. Lubrication jet pitch circle diameter: 90.9 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: 25.1 mm. Abutment diameters: shaft shoulder d1 79 mm minimum, housing shoulder D1 116 mm maximum, seal counterbore D2 119 mm maximum. Fillet radii: r 1.5 mm, r1 1.0 mm. Mass: 1.085 kg per bearing. Abutment faces on the shaft and housing are ground square to the spindle axis to keep assembled runout low.

Interchange guidance

Equivalents at the same envelope, angle, cage and preload: SKF 7214 CDGB/P5, RHP B-series B7214X2-TA-DUM-EP5 and Fafnir 2MM214WI CR DUM. Fafnir 2MM215WI is a 7215 at 75 x 130 x 25 mm and is a related size. RHP 7214A5 is the 25° bearing in the same envelope and is also a related size.