RHPSuper Precision Angular Contact Ball Bearing Pair – 30 mm ID, 55 mm OD, 13 mm Width, Open, 15 Degree, Light Preload, Phenolic Cage

Product Description

What this part is

An RHP super-precision angular contact ball bearing in the 7006 size, supplied as a universally ground matched duplex pair for light-preload mounting. Bore: 30 mm. Outside Diameter: 55 mm. Width: 13 mm per bearing. Bearing type: Angular contact ball bearing, super precision, single row. Closure: Open. Bore type: Straight. Rolling elements: Ball. Bearing material: Carbon chrome bearing steel, BS970 534A99/535A99 or SAE 52100. Series: ISO series 10 (70xx).

Decoding the designation

7006 — ISO series 10, bore code 06, giving 30 x 55 x 13 mm.

C — 15° contact angle.

T — laminated phenolic resin cage, outer-ring guided, rated to 120 °C.

DU — duplex universal matched pair, universally face-controlled so the pair mounts back-to-back, face-to-face or in tandem at the specified preload with no measured spacers.

L — light preload.

P4 — ISO Class 4, ABEC 7, RHP class code EP7.

Load ratings and speed

Dynamic Load Rating: 15.1 kN (15,100 N). Static Load Rating: 10.3 kN (10,300 N). Limiting Speed: 42,000 rev/min oil/air; 26,000 rev/min grease. Axial Preload, light: 78 N. Axial Stiffness, light preload: 39 N per micrometre. Running Accuracy at ISO Class 4: Kia 2.5 µm, Kea 5 µm. Maximum recommended operating temperature: 120 °C. Lubricant: Grease or oil.

What these specs mean in practice

A 15° contact angle favours speed and radial capacity over thrust, which is why it is the usual machine-tool spindle choice at the tool end. Light preload is the lowest of the standard grades, giving the least heat generation and the highest speed ceiling. The tabulated limiting speeds apply to a single bearing under spring preload with the inner ring rotating; a back-to-back light-preload pair takes a 0.80 factor and a face-to-face pair a further 50% reduction. The bearing is preload-set at manufacture.

Quantity and configuration

Unit Quantity: 2 Pcs, one matched universal pair. Number of Rows: 1 per bearing. Total Width as a pair: 26 mm.

Thrust direction

Each bearing is single-row angular contact and takes thrust in one direction. Back-to-back or face-to-face, the pair locates the shaft in both directions; in tandem both rows share thrust in the same single direction.

Mounting data

Abutment diameters: d1 min 36 mm, D1 max 49 mm, D2 max 50 mm. Chamfer: r min 1.0 mm, r1 min 0.6 mm. Effective load centre a: 12.2 mm. Internal free volume: 5.3 cm³. PCD of lubrication jets: 39.5 mm. Mass: 0.114 kg per bearing.

Interchange guidance

Cross references at the same 15° angle, light preload and P4 class: NSK 7006CTRDULP4, Timken/Fafnir 2MM9106WICRDUL. Harmonization Code: 8482.10.50.28.