FafnirSuper Precision Angular Contact Ball Bearing – Straight Bore, 100 mm ID, 150 mm OD, 24 mm Width, Open, 25° Contact Angle, Heavy Preload, Universally Ground

Product Description

What this part is

Fafnir 3MM9120WI-CR-SUH 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: 25°. 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: 3MM9100. Base Number: 3MM9120WI. GTIN: 087796340015.

Decoding the designation

3MM — 25° 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.

H — heavy preload when mounted as a set.

What these specs mean in practice

Dynamic Load Rating: 79,200 N. Static Load Rating: 73,400 N. A 25° contact angle carries substantially more thrust than a 15° execution on the same 100 x 150 x 24 mm envelope, and trades top speed for that capacity.

Limiting Speed: 8,300 rpm grease; 15,000 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: Heavy, which raises axial and radial stiffness and holds position under cutting load. 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 SUH bearing back-to-back, face-to-face or in tandem and takes up heavy preload without shimming.

Interchange guidance

Same 100 x 150 x 24 mm size, 25° angle and super precision class: NSK 7020A5TRSUHP4 and RHP 7020A5TSUHP4 are also single universal heavy-preload (SUH) bearings. FAG B7020-E-T-P4S-UL and IBC 7020-E-TPA-P4-UL are light preload (UL). SKF 7020 ACD/P4A and NTN 7020UAD/GNP4 carry their preload in the suffix. Searchable forms of the Fafnir number: 3MM9120WICRSUH, 3MM-9120-WI-CR-SUH, 3MM 9120 WI CR SUH. Timken world part number: 7020E-T-P4S-SUH.