RHP7036ETDULP4Angular Contact Ball Bearing – Straight Bore, 180 mm ID, 280 mm OD, 46 mm Width, Open, 25° Contact Angle, Light Preload, Matched Duplex Pair

Product Description

What this part is

RHP 7036ETDULP4 super-precision single-row angular contact ball bearing, supplied as a matched duplex pair. Bore: 180 mm. Outside Diameter: 280 mm. Width: 46 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: 7000, ISO dimension series 10. Bore code 36 gives a 180 mm bore. Contact Angle: 25°. Cage Material: laminated phenolic resin. Cage Type: outer-ring guided. Arrangement: DU, a paired unit. Preload: Light. Precision Class: P4. The number is also written 7036-E-T-DUL-P4, B-7036-X3-T-DUL-EP7 and 7036A5TRDULP4. The carton also carries the Fafnir cross 3MM9136WI CR DUL, whose 3MM prefix likewise denotes 25°.

Load ratings and speeds

Dynamic Load Rating: 216 kN. Static Load Rating: 262 kN. Limiting Speed: 6,400 rpm with oil-air lubrication and 4,200 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 large spindles that see heavy axial cutting loads. Axial Preload: 3,100 N as a light-preload pair. Axial Stiffness: 577 N per micron. Effective Load Centre: 76.6 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 7.5 microns. Deviation of mean outside diameter: 0 to minus 13 microns. Radial runout of the assembled inner ring: 6 microns maximum. Radial runout of the assembled outer ring: 10 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: 192 mm minimum. Housing abutment diameter D1: 268 mm maximum. Outer ring abutment diameter D2: 273 mm maximum. Bearing fillet radius r: 2.5 mm minimum. Inner fillet radius r1: 1.5 mm minimum. Internal Volume: 346.4 cubic centimetres. Lubrication jet pitch circle diameter: 217.1 mm. Mass: 9.219 kg per bearing.

Quantity and configuration

Unit Quantity: 2 Pcs. A universally faced matched duplex pair. Universal face control means the inner and outer rings are the same width and the face relationship is ground at manufacture to give the light preload, so the pair mounts back-to-back or face-to-face at the same preload value and shares load equally in tandem, with no custom spacers.

Interchange guidance

Cross-references on the same envelope and execution: SKF 7036 ACD/P4ADGA, Fafnir 3MM9136WI CR DUL, NSK 7036A5TRDULP4. Harmonization Code: 8482.10.50.