RHP7013ETDUMP4Matched Pair Super Precision Angular Contact Ball Bearings 65x100x18 mm, 25° Contact Angle, Phenolic Cage, ABEC 7, Medium Preload, Universally Ground Duplex Set

Product Description

Part identity:

RHP (now NSK) 7013ETDUMP4 super precision angular contact ball bearings, supplied as a universally ground duplex matched pair. Brand: RHP. Designation: 7013ETDUMP4. Base number: 7013E. Series: 70 (ISO dimension series 10, light section). Bore code: 13. Contact angle: 25°. Precision class: P4 (ISO class 4, ABEC 7, RHP EP7). Preload: medium (M). Grouping: DU, duplex universal. Closure: open. Rows: one per bearing, two in the mounted set. Rolling elements: balls. Harmonization code: 8482.10.50. Unit quantity: 2 bearings, one matched duplex pair.

Dimensions:

Bore d: 65 mm. Outside diameter D: 100 mm. Width B: 18 mm per bearing. Ring chamfer r min: 1.1 mm. Second chamfer r1 min: 0.6 mm. Design units: metric. Mass: 0.435 kg per bearing, 0.870 kg (1.92 lb) for the two-piece set. Bearing material: through-hardened high carbon chromium bearing steel to BS970 534A99 / 535A99, equivalent to SAE 52100.

Load ratings and speeds:

Per bearing, basic dynamic load rating Cr: 35 000 N (35.0 kN). Basic static load rating C0r: 32 500 N (32.5 kN). Limiting speed with oil/air lubrication: 18 400 rev/min. Limiting speed with grease lubrication: 11 400 rev/min. Both speed figures are single-bearing values under spring preload with the inner ring rotating; the corresponding figure for a back-to-back medium-preload pair is 0.60 of them, a face-to-face pair is reduced by a further 50 per cent, and a spring-loaded tandem pair carries a factor of 0.95.

Preload and stiffness:

Axial preload for a medium-preload pair in the 70-series 25° range at bore code 13: 880 N. Axial stiffness for the same pair: 272 N/µm. For comparison within the same range, the light grade is 390 N and 196 N/µm, and the heavy grade is 1 770 N and 356 N/µm.

Mounting data:

Effective load centre a: 28.2 mm per bearing. Abutment diameters: d1 min 72 mm, D1 max 93 mm, D2 max 95 mm. Internal free volume: 19.0 cm³ per bearing. Pitch circle diameter for lubrication jets dT: 77.5 mm. Maximum recommended operating temperature for a laminated phenolic resin cage: 120 °C. Recommended shaft fit at P4 in this diameter range: +3 to −2 µm, a mean 3T interference. Recommended housing fit at P4 for a locating position: +5 to −2.5 µm, a mean 5C clearance.

Designation breakdown:

7 is a single-row angular contact ball bearing. 0 is RHP dimension series 10, the ISO 70 light section. 13 is the bore code for 65 mm. E is the 25° contact angle in the RHP scheme, corresponding to A5 in NSK’s. T is the outer-ring guided laminated phenolic cage, written TR in full. DU is duplex universal grouping. M is medium preload. P4 is precision grade 4.

Cage and contact angle:

Cage type: machined one-piece, outer-ring guided. Cage material: laminated phenolic resin. The material and design suit high rotational speed and quiet running, and the cage’s own porosity retains lubricant. A 25° contact angle places more of each ball’s contact load along the shaft axis than the 15° C angle in the same envelope, giving higher axial load capacity and greater axial stiffness at a lower limiting speed — the 15° 7013C runs to 21 600 rev/min on oil/air against 18 400 for this bearing, at Cr 37 000 N and C0r 34 500 N.

Universal face control and arrangement:

The inner and outer rings are the same width and the relative positions of the faces on both sides of each bearing are adjusted at manufacture so that a predetermined preload force exists once the pair is clamped together. The set therefore mounts back-to-back or face-to-face at the same preload value with no shims and no ground spacers, and shares load equally in tandem. Back-to-back (DB) mounting produces the highest radial and moment stiffness; face-to-face (DF) accommodates shaft-to-housing misalignment; tandem (DT) shares thrust in one direction between the two bearings. The high point of radial runout is marked by a small circle or burnished spot on the inner ring face, and a V line on the outer ring outside diameter marks the direction of the contact angle.

Applications:

Machine tool spindles, milling and turning centres, grinding heads, precision gearboxes, rotary and indexing tables, high-thrust precision shafts, and test rigs.

Interchange:

NSK equivalent designation: 7013A5TRDUM P4. Same-envelope designations elsewhere: SKF 7013 ACD/P4ADGB (SKF AC = 25°, DGB = back-to-back matched set), FAG B7013-E-T-P4S-UM. Search forms carried on this record: 7013E-T-DUM-P4, 7013 E T DUM P4, 7013E, 7013. The 15° 7013C bearing shares the 65x100x18 mm envelope with a different contact angle, load rating and speed capability.