RHP7012CTDULP5Super Precision Angular Contact Ball Bearing Matched Pair – 60 mm Bore, 95 mm OD, 18 mm Width Each, 15° Contact Angle, P5 / ABEC 5, Light Preload, Duplex Universal

Product Description

What this part is

RHP 7012CTDULP5 super precision angular contact ball bearings, supplied as a universally matched duplex pair in the ISO 10 dimension series. Each bearing is 60 mm bore, 95 mm outside diameter, 18 mm width, giving 36 mm of total width across the pair. Rings and balls are carbon chrome bearing steel to SAE 52100, through hardened and heat treated for dimensional stability.

Decoding the designation

In the RHP scheme: 7 is a single row angular contact ball bearing, 0 the ISO 10 dimension series, 12 a 60 mm bore code, C a 15° contact angle, T an outer-ring-guided laminated phenolic cage, DU a duplex universal pair, L light preload and P5 the precision grade, equivalent to ABEC 5 and to BS292 grade EP5. The carton repeats the bearing in two further schemes, B7012X2TADUFEP5 in the RHP B-series and 2MM9112WICRDUL in the Fafnir scheme. X2 and 2MM both denote 15°, agreeing with the C, and the Fafnir 9100WI series maps to the ISO 70 series, so 9112 is a 7012. The B-series string also marks DUF, the face-to-face pairing.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness; a 25° bearing in the same envelope carries more thrust and runs slower. Each bearing has a basic dynamic radial load rating of 35.0 kN and a basic static radial load rating of 30.5 kN. Limiting speed for a single bearing under spring preload is 23 000 rev/min on oil/air and 14 200 rev/min on grease; a light-preloaded back-to-back pair derates by a factor of 0.80 to 18 400 and 11 400 rev/min, and a face-to-face pair by a further 50 percent. A light-preloaded pair develops 200 N of axial preload at an axial stiffness of 70 N/µm. The laminated phenolic cage is rated to a maximum operating temperature of 120 °C.

Quantity and configuration

Two bearings, supplied as one matched pair. Universal face control means the inner and outer rings are the same width and the faces are ground at manufacture to the light preload value, so the pair clamps up back-to-back or face-to-face to that preload without custom spacers, or runs in tandem sharing load equally. Bore and outside diameter deviations are matched within a third of the tolerance band and marked in microns on each ring face.

Fitting notes

The high point of radial runout is marked by a burnished spot on the inner ring face and by a V line on the outer ring diameter; the V also indicates the direction of the contact angle, and aligning the marks minimises assembled runout. Shaft abutment diameter is 67 mm and the housing abutment runs 88 mm minimum to 90 mm maximum. Corner radii are 1.1 mm on the bore and 0.6 mm on the outside diameter. Effective load centre is 19.4 mm. Internal free volume is 18.0 cm³ per bearing and the lubrication jet pitch circle is 72.5 mm. For grease lubrication a fill of 30 percent of internal volume suits low and medium speeds, reducing to 20 percent above 60 percent of rated speed. A light interference fit on the shaft with a transition fit in the housing suits a locating position with a rotating inner ring.

Interchange guidance

B7012X2TADUFEP5 and Fafnir 2MM9112WICRDUL are the carton-printed equivalents of this exact execution. SKF 7012 CD/P5DGA matches on envelope, 15° contact angle, phenolic cage, P5 class and light preload, the DGA suffix being SKF’s light preload grade. NSK 7012CTYNDULP5 shares the envelope, angle, preload and class but uses a TYN polyamide cage, so it is a related size on cage material. The 7012A5 executions run a 25° contact angle in the same envelope and are a related size rather than an interchange.