FafnirAngular contact bearings – 30 mm ID, 55 mm OD, 13 mm Width, Open, 25°, Light preload.

Product Description

What this part is

Fafnir 3MM9106WI-SUL super-precision angular contact ball bearing. Bore: 30 mm. Outside diameter: 55 mm. Width: 13 mm. Series: 9100. Single row, open on both faces. Contact Angle: 25°. The 9100WI series maps to the ISO 70xx light series, so this envelope is the ISO 7006 size.

Decoding the designation

3MM — 25° contact angle, MM precision grade: P4, ABEC 7.

WI — super-precision spindle execution.

SU — single bearing, universally ground so any two pieces stack back-to-back, face-to-face or in tandem and reach the marked preload when clamped.

L — light preload.

Published ratings

Precision Class: P4 (ABEC 7). Preload: Light. Country of origin on this item: United States. Dynamic Load Rating: 13.7 kN (3,079 lbf). Static Load Rating: 9.4 kN (2,113 lbf). Limiting Speed: 26,000 rpm. Operating temperature range: −20 °C to 120 °C. Item weight: 0.25 lb.

What these specs mean in practice

A 25° contact angle carries more thrust and less speed than a 15° bearing of the same envelope, which suits a spindle taking a substantial axial cutting or feed load. The machined phenolic cage is light, self-lubricating and runs quietly, and the 120 °C ceiling is the phenolic material limit rather than a steel limit. Light preload gives the lowest heat generation of the preload ladder while still eliminating ball skidding at speed.

Quantity and configuration

One bearing, universally matchable. Unit Quantity: 1 Pc. The carton also carries the DUL duplex marking, which is the factory pairing designation for this execution.

Interchange guidance

Same-envelope 25° super-precision cross-references: SKF 7006 ACD/P4ADGA at extra light rather than light preload; FAG B7006-E-T-P4S-UL at P4S rather than P4 running accuracy; NSK 7006A5. The ISO base number is 7006. NSK 7006A is a related size on the same 30 x 55 x 13 mm envelope at a 30° contact angle, and a 7006C or 7006 CD is the same envelope at 15°.