Fafnir2MM310WICRSULAngular Contact Ball Bearing – Straight Bore, 50 mm ID, 110 mm OD, 27 mm Width, Open, 15° Contact Angle, Light Preload, Single Universal.

Product Description

What this part is

Fafnir 2MM310WI-CR-SUL super-precision angular contact ball bearing, 300WI spindle range, 50 x 110 x 27 mm. Bore Diameter: 50 mm. Outside Diameter: 110 mm. Overall Width: 27 mm. Contact Angle: 15°. Precision Class: ABEC 7/9 / P4S. Dynamic Load Rating: 77,900 N. Static Load Rating: 46,200 N. Limiting Speed: 13,600 rpm grease; 27,200 rpm oil. Item Weight: 1.05 kg (2.31 lb). Preload: Light. Cage Material: Phenolic. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Bearing Material: Chrome steel. Number Of Rows: 1. Mounting Arrangement: Universal. Lubricant: grease or oil. Series: 300WI. Base Number: 2MM310WI.

Decoding the designation

2MM — 15° contact angle.

MM — Fafnir super-precision execution, ISO Class P4S, equivalent to ABEC 7/9.

310 — 300 spindle series, 50 mm bore, ISO 7310 envelope.

WI — low shoulder on both rings.

CR — phenolic cage.

SUL — single universally ground bearing set for light preload.

What these specs mean in practice

Contact Angle: 15°. The shallower angle favours speed and radial stiffness over thrust capacity, which is the usual choice for a high-speed spindle position.

Dynamic Load Rating: 77,900 N, rated over one million revolutions. Static Load Rating: 46,200 N. The heavy 300 section carries these ratings in a 27 mm width.

Limiting Speed: 13,600 rpm grease; 27,200 rpm oil. Oil feed doubles the ceiling because it carries heat out of the contact as well as lubricating it.

Preload: Light. Light preload gives the highest speed capability of the preload ladder and the lowest heat generation.

Cage Material: Phenolic. A machined phenolic cage is light, damps vibration and holds oil in its own structure.

Item Weight: 1.05 kg (2.31 lb).

Mounting data

Bore Type: Straight. Shaft backing shoulder diameter: 60.7 mm. Housing backing shoulder diameter: 99.8 mm. Maximum housing fillet radius the bearing corners will clear: 2 mm.

Mounting Arrangement: Universal — universally ground faces allow this bearing to be stacked with further SUL bearings back-to-back, face-to-face or in tandem, taking up the light preload on assembly. The bearing is preload-established rather than clearance-set.

Quantity and configuration

Unit Quantity: 1 Pc. One single universally ground bearing.

Interchange guidance

Cross-Reference 1: Timken 7310C-T-P4S-SUL. Cross-Reference 2: FAG B7310-C-T-P4S-UL. Cross-Reference 3: SKF 7310 CDGA/P4A. Cross-Reference 4: NSK 7310CTRSULP4. Cross-Reference 5: IBC 7310-C-T-P4S-UL.

Cross-Reference 6: 3MM310WI-CR-SUL shares the 50 x 110 x 27 mm envelope at a 25° contact angle and is a related size rather than a direct interchange.

Searchable forms of the designation: 2MM310WICRSUL, 2MM310WI-CR-SUL, 2MM 310 WI CR SUL, 2MM310WISUL, 7310C.