RHPSuper Precision Angular Contact Ball Bearing Matched Pair – 60 mm ID, 95 mm OD, 18 mm Width, Open, 15° Contact Angle, Light Preload, ABEC 9

Product Description

What this part is

RHP 7012CTDULP2 matched pair of single-row super-precision angular contact ball bearings, made in the United Kingdom. Bore: 60 mm. Outside Diameter: 95 mm. Overall Width: 18 mm. Contact Angle: 15°. Precision Class: P2, which corresponds to ABEC 9, to BS292 EP9 and to ISO 492 Class 2. Number Of Rows: 1 per bearing. Rolling Elements: Balls. Bearing Material: Carbon chrome bearing steel to BS970 534A99/535A99, comparable to SAE 52100, through hardened. Series: 7000, ISO dimension series 10. RHP is an NSK brand.

Decoding the designation

Reading 7012-C-T-DUL-P2: 7 is a single-row angular contact ball bearing, 0 is ISO dimension series 10, the bore code 12 gives a 60 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 P2 is the precision grade. The carton carries the same bearing in two further schemes: B7012X2 TADU EP9, where X2 is the 15° angle and EP9 the precision grade, and the Fafnir cross 2MMV9112WI CR DUL, where 2MM is the 15° angle and CR the phenolic outer-land-riding cage. All three agree.

What these specs mean in practice

Dynamic Load Rating: 35.0 kN per bearing. Static Load Rating: 30.5 kN per bearing. Limiting Speed, oil-air lubrication: 23,000 rpm. Limiting Speed, grease lubrication: 14,200 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 18,400 rpm on oil-air and 11,360 rpm on grease. A 15° contact angle favours speed and radial stiffness where a 25° angle favours thrust capacity.

What the P2 accuracy class buys

Precision Class: P2. Radial Runout Of The Assembled Inner Ring: 2.5 µm. Reference Face Runout With Bore: 1.3 µm. Radial Runout Of The Assembled Outer Ring: 3.8 µm. Deviation Of Mean Bore Diameter: 0 to −3.8 µm. P2 is the tightest grade RHP builds in this range, one step above the P4 that covers most spindle work, and it buys lower runout, closer shaft location and quieter running at speed.

Cage and temperature

Cage Material: Laminated phenolic resin. Cage Type: Outer-ring guided. Maximum Operating Temperature: 120 °C, the limit set by the phenolic cage. The low cage mass and the outer-ring land guidance are what give the range its high speed capability and quiet running.

Preload and stiffness

Preload: Light. Axial Preload: 200 N for the mounted pair. Axial Stiffness: 70 N/µm. Light is the grade 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: 67 mm. Maximum Housing Abutment Diameter: 88 mm. Maximum Outer Ring Abutment Diameter: 90 mm. Chamfer r min: 1.1 mm. Chamfer r1 min: 0.6 mm. Effective Load Centre a: 19.4 mm. Internal Volume: 18.0 cm³. Pitch Circle Diameter Of Lubrication Jets: 72.5 mm. The rings are universally faced, so the pair mounts back-to-back or face-to-face without altering the preload value.

Quantity and configuration

Unit Quantity: 2 Pcs. Arrangement: DU, a universally matched pair. Item Weight: 0.814 kg (1.79 lb) for the pair, 0.407 kg (0.90 lb) each. Bore and outside diameters are matched across the set and the deviation from nominal in microns is marked on each ring face.

Part number forms and nearby parts

Other makers’ designation at the same 60 x 95 x 18 mm size, 15° angle, light preload and ABEC 9 grade: Fafnir 2MMV9112WI CR DUL. RHP’s own B-series form is B7012X2TADUEP9. The designation is also written 7012CTDULP2, 7012 C T DUL P2, 7012C and 7012-C-T-DUL-P2. A 7012 at a 25° contact angle shares this 60 x 95 x 18 mm envelope but carries different ratings and speeds, so it is a related size rather than a substitution.