RHP7008CTDUMP4Angular Contact Ball Bearing – 40 mm ID, 68 mm OD, 15 mm Width, 15° Contact Angle, Medium Preload, ABEC 7 / P4.

Product Description

What this part is

RHP 7008-C-T-SUM-P4 super-precision single-row angular contact ball bearing, universally ground for matching. Bore Diameter: 40 mm. Outside Diameter: 68 mm. Overall Width: 15 mm. Contact Angle: 15°. Precision Class: ABEC 7 / P4. Cage Material: Phenolic. Cage Type: Outer-ring guided. Closure Type: Open. Bore Type: Straight. Rolling Elements: Ball. Number Of Rows: 1. Unit Quantity: 1 Pc. Bearing Material: Chrome bearing steel (SAE 52100), through hardened and heat treated for stability.

Decoding the designation

7 — single-row angular contact ball bearing.

0 — RHP dimension series 0, ISO series 10. This is the 70xx light section.

08 — bore code, multiplied by five for a 40 mm bore.

C — 15° contact angle. The lower of the two preferred super-precision angles, favouring speed and radial rigidity over axial capacity.

T — laminated phenolic resin cage, guided on the outer ring. Maximum recommended operating temperature 120 °C.

SU — single universal. One bearing with universal face control, ground so any two of the same designation combine as a matched pair at the stated preload.

M — medium preload. Axial preload 290 N and axial stiffness 77 N/µm when two are paired. Medium sits between the 120 N light and 590 N heavy grades at this size, trading top speed for rigidity.

P4 — RHP precision grade P4: ISO Class 4, ABEC 7, British Standard EP7.

B7008X2TASUMEP7 — the same bearing in RHP’s B-series scheme. X2 is the 15° contact angle, TA the outer-ring centred cage, SUM the medium-preload universal single, EP7 the BS292 precision grade.

2MM9108WICRSUM — the Fafnir equivalent carried on the same carton. 2MM is 15°, 9108WI the ISO 7008 envelope with low shoulders on both rings, CR the phenolic cage, SUM the medium-preload universal single.

What these specs mean in practice

Dynamic Load Rating: 20,600 N. Static Load Rating: 15,900 N. Limiting Speed: 21,000 rpm grease; 34,000 rpm oil. The oil figure assumes an oil/air system delivering metered oil in an airstream; the grease figure assumes a premium synthetic high-speed grease.

Running Accuracy: inner ring radial runout Kia 4 µm maximum, outer ring radial runout Kea 5 µm maximum. Lubricant: grease or oil. Preload: Medium (M). Mounting Arrangement: Single universal (SU).

Universal face control means the inner and outer rings are the same width and the face positions are ground at manufacture to deliver the stated preload. Two bearings can be mounted back-to-back or face-to-face without changing the preload value, and share load equally in tandem. Custom-width spacers are not part of the adjustment.

The high point of radial runout is marked with a small circle or burnished spot on the inner ring face and a V line on the outer ring outside diameter. The V line also indicates the direction of the contact angle.

Mounting data

Shaft abutment diameter: 46 mm minimum. Housing abutment diameters: 62 mm maximum and 63 mm maximum. Chamfer dimensions: r 1.0 mm minimum, r1 0.6 mm minimum. Effective load centre a: 14.7 mm. Internal free volume: 8.2 cm³. Lubrication jet pitch circle diameter: 50.0 mm. Item Weight: 0.189 kg (0.42 lb).

Limiting speed factors for sets: 0.60 for a back-to-back medium-preload pair, a further 50 percent reduction face-to-face, and 0.95 for a spring-loaded tandem pair.

Interchange guidance

Same envelope, same 15° contact angle and same P4 class: SKF 7008 CD/P4A, FAG B7008-C-T-P4S-UM, NSK 7008CTRSUMP4, NTN 7008UCG/GNP4, Timken/Fafnir 2MM9108WICRSUM, Koyo 7008C-5GLFGP4, GMN S6008 C TA P4, SNR 7008CVUJ84.

Harmonization Code: 84821000.