RHPAngular Contact Ball Bearing – 55 mm ID, 100 mm OD, 21 mm Width, Open, 15° Contact Angle, Light Preload, Phenolic Cage, ABEC 3

Product Description

What this part is

RHP 7211CTBSULP6 single-row angular contact ball bearing, ISO dimension series 02. Bore: 55 mm. Outside Diameter: 100 mm. Overall Width: 21 mm. Contact Angle: 15°. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Rolling Elements: chrome steel balls. Cage Material: laminated phenolic. Precision Class: P6 / ABEC 3. Unit Quantity: 1 Pc.

Decoding the designation

7211 — ISO dimension series 02, bore code 11, 55 mm bore. C — Contact Angle: 15°. TB — Cage Type: one-piece machined cage, inner ring centred, in laminated phenolic. SU — universal face control: the two ring faces are ground to a fixed offset at manufacture. L — Preload: light. P6 — Precision Class: ISO class 6, equivalent to ABEC 3 and to the RHP EP3 grade. The carton also carries the Fafnir cross 2MM211WI-SUL, whose 2MM prefix is the same 15° contact angle.

What these specs mean in practice

Dynamic Load Rating: 53.0 kN (11,915 lbf). Static Load Rating: 40.0 kN (8,992 lbf). A 15° contact angle biases the bearing toward speed and radial capacity; a 25° bearing on the same envelope carries more thrust and turns more slowly. ABEC 3 is a step tighter than normal class, giving closer shaft location and lower running vibration. Universal face control lets any two of these bearings clamp up to the intended preload back-to-back, face-to-face or in tandem with no ground spacer. Light preload keeps the balls in rolling contact with the least friction and heat of the four RHP preload grades: mounted as a back-to-back pair it develops 290 N of axial preload and 74 N/µm of axial stiffness. Maximum recommended operating temperature is 120 °C, set by the laminated phenolic cage. Internal Clearance: N/A — the bearing is preload-set rather than clearance-set.

Quantity and configuration

Unit Quantity: 1 Pc. One universally faced single bearing. A single bearing carries thrust in one direction; a back-to-back or face-to-face pair carries it in both, and a tandem pair shares a one-way thrust load between the two bearings.

Mounting data

Shaft abutment diameter d1: 64 mm minimum. Housing abutment diameter D1: 91 mm maximum. Second housing abutment diameter D2: 94 mm maximum. Chamfer r: 1.5 mm minimum. Chamfer r1: 1.0 mm minimum. Effective load centre a: 20.9 mm. Internal free volume: 27.8 cm³. Pitch circle diameter for lubrication jets: 72.0 mm. Mass: 0.603 kg (1.33 lb).

Interchange guidance

Equivalents on the same 55 x 100 x 21 mm envelope at 15°, universally faced and light preload: FAG 7211-C-T-P6-UL and Fafnir 2MM211WI-SUL. Related sizes on the same envelope with different characteristics: 7211E at 25°, 7211B at 40°, and the SUM and SUH medium and heavy preload grades.