Fafnir2MM212WISuper Precision Angular Contact Ball Bearing 60x110x22 mm, 15° Contact Angle, Phenolic Cage, ABEC 7 / P4S, Universally Ground

Product Description

What this part is

A Fafnir 2MM212WI super-precision single-row angular contact ball bearing for machine-tool spindles. Brand: Fafnir (Timken). Part Number: 2MM212WI. Base Number: 7212. Series: Fafnir 2MM 200 series WI. Bore: 60 mm. Outside Diameter: 110 mm. Overall Width: 22 mm. Contact Angle: 15°. Number Of Rows: 1. Rolling Elements: Balls. Material: Chrome steel. Cage Type: Composition retainer (CR), one-piece, piloted on the ground thrust shoulder land of the outer ring. Cage Material: Phenolic laminated fabric. Precision Class: ABEC 7 / P4S — running accuracy to ABEC 9 (ISO P2), other features to ABEC 7 (ISO P4). Bore Type: Straight. Closure Type: Open. Item Weight: 1.7 lbs. GTIN: 087796070677. Harmonization Code: 8482.10.50.28. Design Units: Metric.

Decoding the designation

2: the contact-angle prefix in Timken / Fafnir super-precision numbering, 2MM = 15° and 3MM = 25°. MM: Fafnir super-precision, the P4S tolerance package — running accuracy and performance to ABEC 9 (ISO P2) with the remaining features to ABEC 7 (ISO P4). 212: 200 series, bore code 12, so a 60 mm bore. WI: the WI construction, a low shoulder on the non-thrust side of both the inner and the outer ring, with the balls separated by a one-piece cage piloted against a ground thrust shoulder land of the outer ring. CR: composition retainer, a phenolic laminated-fabric cage. Fafnir stamps CR on the carton rather than the ring.

What these specs mean in practice

A 15° contact angle is the high-speed end of the range. The shallow angle keeps the ball load path closer to radial, so centrifugal ball loading and heat generation stay low and the bearing tolerates a higher DN value than a 25° or 40° equivalent, with less thrust capacity and axial stiffness in exchange. That makes 15° the grinding-spindle and high-speed-milling choice, while thrust-dominant boring and drilling positions call for 25° or steeper. ABEC 7 controls bore, outside diameter, width and above all radial and axial runout, so the ring fits in any rotational orientation. The phenolic cage is the matching high-speed choice: light, self-lubricating, and rated for continuous service to 120 °C.

Quantity and configuration

Unit Quantity: 1 Pc. Arrangement / Configuration: single, universally ground, so two of these clamp face-to-face, back-to-back or in tandem and develop a repeatable preload. The factory-matched pairs carry the DUL, DUM and DUH designations to a named preload class.

Interchange guidance

Fafnir is now sold by Timken, so Timken 2MM212WI and Fafnir 2MM212WI are the same part. Direct 60 x 110 x 22 mm super-precision 15° equivalents: NSK 7212CTYNSULP4, SKF 7212 CD/P4A, NTN 7212CT1P4 and RHP 7212CTP4 — C and CD are the 15° codes in those schemes. Carried as same-envelope references with the difference named: SKF 7212 ACD/P4A and NSK 7212A5TYNP4 are 25°, RHP 7212ETP4 is 25° in RHP nomenclature, and FAG 7212-B-TVP-P4 is 40°. Within Fafnir, 3MM212WI is this bearing at 25°. Contact angle is the field that decides a substitution.