RHP7206ETDULP4Angular Contact Ball Bearing – Straight Bore, 30 mm ID, 62 mm OD, 16 mm Width, Open, 25° Contact Angle, Light Preload, Single Universal

Product Description

What this part is

RHP 7206ETSULP4 super-precision single-row angular contact ball bearing. Bore: 30 mm. Outside Diameter: 62 mm. Width: 16 mm. Contact Angle: 25°. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Rolling Elements: chrome steel balls. Bearing Material: carbon chrome bearing steel to BS970 534A99 / 535A99, equivalent to SAE 52100, through hardened and stabilised.

Decoding the designation

Series: 7200, ISO dimension series 02. Bore code 06 gives a 30 mm bore. Contact Angle: 25°. Cage Material: laminated phenolic resin. Cage Type: outer-ring guided. Arrangement: SU, single universally ground. Preload: Light. Precision Class: P4. The number is also written 7206-E-T-SUL-P4, 7206X3TAULEP7 and 7206A5TRSUL. The carton also carries the Fafnir cross 3MM206WI CR SUL, whose 3MM prefix likewise denotes 25°.

Load ratings and speeds

Dynamic Load Rating: 22.1 kN. Static Load Rating: 14.1 kN. Limiting Speed: 34,700 rpm with oil-air lubrication and 21,400 rpm with grease. The two figures differ because oil-air carries heat out of the bearing and continuously replenishes the film, while grease lubricates without cooling. Mounted as a light-preload back-to-back pair the limiting speed carries a factor of 0.80; face-to-face mounting halves it again.

What these specs mean in practice

A 25° contact angle carries more thrust and less speed than a 15° execution of the same size, which suits spindles that see heavy axial cutting loads. Axial Preload: 200 N in a light-preload pair. Axial Stiffness: 107 N per micron. Effective Load Centre: 18.7 mm. Lubricant: oil or grease. Maximum Operating Temperature: 120°C, set by the laminated phenolic resin cage. A phenolic cage is light, self-lubricating and quiet, and it runs guided on the outer ring land so the cage is stabilised by the slower-moving ring.

Precision and running accuracy

Precision Class: P4. Precision Rating: ABEC 7, ISO 492 Class 4, BS292 EP7. Deviation of mean bore diameter: 0 to minus 4 microns. Deviation of mean outside diameter: 0 to minus 5 microns. Radial runout of the assembled inner ring: 2.5 microns maximum. Radial runout of the assembled outer ring: 5 microns maximum. 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 outside diameter, and the V also indicates the direction of the contact angle.

Mounting data

Shaft abutment diameter d1: 36 mm minimum. Housing abutment diameter D1: 56 mm maximum. Outer ring abutment diameter D2: 57 mm maximum. Bearing fillet radius r: 1.0 mm minimum. Inner fillet radius r1: 0.6 mm minimum. Internal Volume: 8.8 cubic centimetres. Lubrication jet pitch circle diameter: 42.4 mm. Mass: 0.194 kg.

Quantity and configuration

Unit Quantity: 1 Pc. A single universally ground bearing. Universal face control means the inner and outer rings are the same width and the face relationship is ground at manufacture to the light preload value, so two of these bearings mount back-to-back or face-to-face at the same preload and share load equally in tandem, with no custom spacers.

Interchange guidance

Cross-references on the same envelope and execution: Fafnir 3MM206WI CR SUL, SKF 7206 ACD/P4A, NSK 7206A5TRSU. Harmonization Code: 8482.10.50.28.