FafnirSuper Precision Angular Contact Ball Bearing – Straight Bore, 100 mm ID, 150 mm OD, 24 mm Width, Open, 15° Contact Angle, Light Preload, Universally Ground

Product Description

What this part is

Fafnir 2MM9120WI-CR-SUL super precision spindle angular contact ball bearing, a single universally ground bearing. Bore Diameter: 100 mm. Outside Diameter: 150 mm. Overall Width: 24 mm. Contact Angle: 15°. Precision Class: ABEC 7/9 / P4S. Cage Material: Phenolic. Rolling Elements: Ball. Bearing Material: Bearing Steel. Bore Type: Straight. Closure Type: Open. Number Of Rows: 1. Item Weight: 1.30 kg (2.86 lb). Design Units: Metric. Series: 2MM9100. Base Number: 2MM9120WI. GTIN: 087796226098.

Decoding the designation

2MM — 15° contact angle, Fafnir super precision range.

9120 — 9100WI series, ISO 70-series envelope, 100 mm bore, giving the 7020 boundary dimensions.

WI — low shoulder on both rings.

CR — phenolic cage.

SU — single bearing, universally ground.

L — light preload when mounted as a set.

What these specs mean in practice

Dynamic Load Rating: 83,600 N. Static Load Rating: 77,400 N. A 15° contact angle favours speed and radial stiffness, carrying less thrust than a 25° execution on the same envelope and running cooler at the same shaft speed.

Limiting Speed: 8,300 rpm grease; 16,600 rpm oil. Lubricant: grease or oil. Item Weight: 1.30 kg (2.86 lb).

Precision Class: ABEC 7/9 / P4S gives tight raceway and face runout, for spindle work where shaft position has to hold under load. Preload: Light, the grade chosen where speed and running temperature matter more than maximum stiffness. Internal Clearance: N/A — a universally ground bearing is set by preload when stacked.

Mounting data

Shaft Backing Shoulder Diameter: 109.9 mm (4.330 in). Housing Backing Shoulder Diameter: 140.8 mm (5.550 in). Maximum housing fillet radius the bearing corners clear: 1.5 mm (0.059 in).

Quantity and configuration

Unit Quantity: 1 Pc. Universally ground with flush faces, so it stacks against another SUL bearing back-to-back, face-to-face or in tandem and takes up light preload without shimming.

Interchange guidance

Closest 15° parts on the 100 x 150 x 24 mm size: FAG B7020-C-T-P4S-UL and NSK 7020CTRSULP4 (light preload), then RHP 7020CTSULP4, IBC 7020-C-TPA-P4-UL and Koyo 7020CTRSULP4. SKF 7020 CD/P4A takes its preload from the DG suffix and NTN 7020UCG/GNP4 preload should be confirmed before ordering. The 25° Fafnir 3MM9120WI-CR-SUH is a related size rather than a substitution, since the contact angle and preload change the thrust and speed behaviour. Searchable forms of the Fafnir number: 2MM9120WICRSUL, 2MM-9120-WI-CR-SUL, 2MM 9120 WI CR SUL. Timken world part number: 7020C-T-P4S-SUL.