RHP7206ATDUMP4Angular Contact Ball Bearing – 30 mm ID, 62 mm OD, 16 mm Width, 30° Contact Angle, ABEC 7 / P4, Medium Preload, Open.

Product Description

What this part is

RHP 7206ATDUMP4-1/2PR super precision single-row angular contact ball bearing. Bore Diameter: 30 mm. Outside Diameter: 62 mm. Overall Width: 16 mm. Contact Angle: 30°. Rolling Elements: Ball. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Series: 7200. Base Number: 7206.

Decoding the designation

7 — single-row angular contact ball bearing.

2 — RHP dimension series 2, ISO series 02.

06 — bore code 06, a 30 mm bore.

A — 30° contact angle, the steepest of the three angles in this range. The carton’s B-series code X4 states the same 30°, and NSK’s own datasheet for the 7206A gives 30°.

T — machined cage in laminated phenolic resin, outer-ring guided.

DU — duplex universal. The factory set is two bearings ground together with the bores and outside diameters size-graded to share load evenly.

M — medium preload. Preload: Medium (M).

P4 — RHP precision grade P4. Precision Class: ABEC 7 / P4. The carton’s EP7 marking is the British Standards form of the same grade.

-1/2PR — half a pair. Unit Quantity: 1 Pc.

What these specs mean in practice

Dynamic Load Rating: 26,900 N. Static Load Rating: 13,600 N. Limiting Speed: 16,400 rpm grease; 21,800 rpm oil. Permissible axial load: 9,200 N. Cage Material: Phenolic. Cage Type: Machined, outer-ring guided. Bearing Material: Bearing steel, SAE 52100 equivalent, through hardened and heat treated for dimensional stability. Lubricant: Grease or oil. Max temp: 120 °C.

The 30° angle puts the load line further from radial than the 15° and 25° executions of the same envelope, which raises axial capacity and axial rigidity and lowers the speed ceiling. Against the 15° 7206C the dynamic rating rises from 23,000 N to 26,900 N while the oil-air speed falls from 39,200 rpm to 21,800 rpm. Mounted as a back-to-back or face-to-face pair the medium setting gives an axial preload of 625 N, an axial rigidity of 210 N/µm and a measured axial clearance of −15 µm. At P4 the assembled inner ring runs within 2.5 µm radial runout and the outer ring within 5 µm.

Mounting data

Shaft abutment diameter da: 36 mm minimum. Housing abutment diameter Da: 56 mm maximum. Housing abutment diameter Db: 57 mm maximum. Maximum fillet radius on the mating shaft or housing ra: 1 mm. Maximum fillet radius rb: 0.5 mm. Bearing chamfer dimension r: 1 mm minimum. Bearing chamfer dimension r1: 0.6 mm minimum. Effective load centre a: 21.3 mm. Recommended grease quantity: 1.2 g per bearing. Item Weight: 0.197 kg (0.43 lb).

Quantity and configuration

Unit Quantity: 1 Pc. Mounting Arrangement: one bearing from a factory-matched duplex pair, universally face-ground. Inner and outer rings are the same width with the face steps pre-adjusted at manufacture, so it pairs with a second universally ground bearing back-to-back, face-to-face or in tandem without custom-ground spacers. The ring is marked at the high point of radial runout by a burnished spot on the inner ring face and a V line on the outer ring outside diameter.

Interchange guidance

Same envelope and same 30° contact angle: NSK 7206A, NSK 7206ATYNSUMP4 (30°, P4, polyamide cage), NTN 7206, Koyo 7206. The Fafnir MM scheme codes two angles only, 2MM for 15° and 3MM for 25°, so the 3MM206WI marked on this carton is the nearest Fafnir number by envelope and class rather than an angle-for-angle match.