RHPSuper Precision Angular Contact Ball Bearing Matched Pair – 45 mm ID, 75 mm OD, 16 mm Width, Open, 15° Contact Angle, Light Preload, P3 Precision Class, 2 Pcs.

Product Description

What this part is

RHP 7009CTDULP3 super precision angular contact ball bearings, supplied as a factory-matched duplex pair. Bore: 45 mm. Outside Diameter: 75 mm. Width: 16 mm per bearing. Closure: Open. Contact Angle: 15°. Cage Type: machined, outer-ring guided. Cage Material: laminated phenolic resin. Preload: Light (L), 150 N axial per bearing. Precision Class: P3 (dimensional accuracy ISO Class 4, running accuracy ISO Class 2). Series: ISO series 10 (70xx). The carton also carries 2M9109WI CR DUL.

Decoding the designation

7009 — ISO dimension series 10, bore code 09, giving a 45 mm bore.

C — 15° contact angle, cross-confirmed by the Fafnir 2MM prefix on the alternate marking.

T — machined laminated phenolic resin cage, outer-ring guided, matching CR on that marking.

DU — matched duplex pair with universal face control.

L — light preload.

P3 — intermediate grade: P2 runout tolerances with P4 external tolerances.

Load ratings and speed

Dynamic Load Rating: 24.4 kN (24,400 N / 5,485 lbf) per bearing. Static Load Rating: 19.3 kN (19,300 N / 4,339 lbf) per bearing. Limiting Speed: 30,500 rpm oil/air; 18,800 rpm grease, tabulated for a single bearing under spring preload with the inner ring rotating. Axial Preload, light: 150 N. Axial Stiffness at light preload: 58 N per micrometre. Maximum recommended operating temperature: 120 °C. Lubricant: Grease or oil.

What these specs mean in practice

P3 is the significant spec here. It holds the bore and outside diameter to ISO Class 4 while tightening radial and axial runout to ISO Class 2, so the running accuracy is a grade above a standard P4 spindle bearing. Running Accuracy: Kia 2.5 µm at the 45 mm bore, Kea 3.8 µm at the 75 mm outside diameter. That combination suits work where surface finish depends on runout rather than on fit. The 15° contact angle biases the pair toward speed rather than thrust, and light preload keeps heat generation and running torque low. The bearing is preload-set at manufacture.

Quantity and configuration

Unit Quantity: 2 Pcs, one matched duplex pair, ground so that light preload comes up on assembly. Arrangement: Duplex matched set (DU). Number of Rows: 1 per bearing. Total Width as a pair: 32 mm. Load ratings and limiting speeds are per bearing.

Mounting data

Shaft abutment diameter d1: 51 mm minimum. Housing abutment diameter D1: 69 mm maximum. Outer ring abutment D2: 70 mm maximum. Chamfer r: 1.0 mm minimum. Chamfer r1: 0.6 mm minimum. Effective load centre a: 16.0 mm. Internal free volume: 11.2 cm³. PCD of lubrication jets: 55.6 mm. Mass: 0.238 kg per bearing, 0.476 kg for the pair.

Interchange guidance

NSK 7009CTRDULP3 is the direct equivalent: same 45 x 75 x 16 mm envelope, 15°, light preload, P3 grade. Executions of the same number in P4, at 25°, or at medium or heavy preload share the envelope and are related sizes. Harmonization Code: 8482.10.50.28.