Fafnir2MM9105WICRAngular Contact Ball Bearing – 25 mm ID, 47 mm OD, 12 mm Width, 15° Contact Angle, Open, ABEC 7/9 P4S

Product Description

What this part is

Fafnir 2MM9105WI-CR, a super-precision angular contact ball bearing built by Timken under the Fafnir brand for machine tool spindle service. Bore Diameter: 25 mm. Outside Diameter: 47 mm. Overall Width: 12 mm. Contact Angle: 15°. Precision Class: ABEC 7 / P4S. Rolling Elements: Ball. Bearing Material: Chrome steel. Bore Type: Straight. Closure Type: Open. Number Of Rows: 1. Item Weight: 0.077 kg (0.170 lb). GTIN: 0087796072053.

Decoding the designation

2MM — 15° contact angle on the Fafnir super-precision range, with the MM prefix carrying ISO P4S tolerancing.

9105 — the 9100WI series, which maps to the ISO 70xx light series; this size is the ISO 7005.

WI — low shoulder on both rings, the high-speed spindle execution.

CR — the Fafnir cage code carried on this execution.

What these specs mean in practice

Dynamic Load Rating: 12,900 N. Static Load Rating: 7,400 N. Limiting Speed: 30,900 rpm grease; 61,800 rpm oil. A 25 mm bore in the light 9100WI section gives a small ball complement and a thin ring section, which is what puts the oil-lubricated speed above 60,000 rpm. The 15° contact angle favours speed and radial stiffness; a 25° execution on the same envelope trades speed away for axial load capacity. Lubricant: grease or oil.

Mounting data

Shaft backing shoulder diameter: 29.9 mm (1.180 in). Housing backing shoulder diameter: 42.6 mm (1.680 in). Series: 9100WI. Base Number: 2MM9105WI.

Quantity and configuration

Unit Quantity: 1 Pc. Single bearing in the bare 2MM9105WI-CR execution.

Interchange guidance

Direct metric super-precision equivalents at 15° and P4 class: SKF 7005 CD/P4A, FAG B7005-C-T-P4S-UL, NSK 7005CTYNSULP4, NTN 7005UCG/GNP4, RHP 7005CTSULP4, Koyo 7005C/GLP4, SNR 7005CVUJ74. Searchable forms of this number include 2MM9105WICR, 2MM-9105-WI-CR, 2 MM 9105 WI CR and 7005C-T-P4S.