Fafnir2MM9105WIDULC1Super-Precision Angular Contact Ball Bearing Pair – 25 mm Bore, 47 mm OD, 12 mm Width, 15°, Light Preload

Product Description

What this part is

Fafnir 2MM9105WICRDUL, a super-precision angular contact ball bearing supplied as a universally ground duplex pair. Bore Diameter: 25 mm. Outside Diameter: 47 mm. Overall Width: 12 mm per bearing. Total Width: 24 mm mounted as a pair. Contact Angle: 15°. Rolling Elements: Ball. Number Of Rows: 1 per bearing. Bore Type: Straight. Closure Type: Open. Cage Material: Phenolic. Precision Class: ABEC 7/9 / P4S. Preload: Light. Series: 9100WI. Base Number: 2MM9105WI. GTIN: 087796072060.

Decoding the designation

2MM — Fafnir super-precision spindle range at a 15° contact angle, ground to ABEC 7/9 (P4S) tolerances.

9105 — the 9100 light dimension series, bore code 05, which maps to the ISO 7005 envelope: 25 mm bore, 47 mm outside diameter, 12 mm width.

WI — low shoulder on both rings.

CR — phenolic cage.

DUL — duplex pair, universally ground, light preload. Either face can be brought together, so the pair mounts back-to-back, face-to-face or in tandem.

What these specs mean in practice

Dynamic Load Rating: 12,900 N per bearing. Static Load Rating: 7,400 N per bearing. Limiting Speed: 30,900 rpm grease; 61,800 rpm oil. Item Weight: 0.154 kg (0.34 lb) for the pair. Internal Clearance: N/A — a preloaded set is clamped to a defined stiffness rather than run to a clearance. The light 9100 cross-section keeps ball size and centrifugal load down, which is what supports the 61,800 rpm oil figure. A 15° contact angle favours speed and radial rigidity over thrust capacity, and light preload holds running heat down.

Mounting data

Shaft Backing Shoulder Diameter: 29.9 mm. Housing Backing Shoulder Diameter: 42.6 mm. Maximum Housing Fillet Radius: 0.6 mm (0.024 in) — the largest housing corner radius the bearing corners will clear.

Quantity and configuration

Unit Quantity: 2 Pcs. One universally ground duplex pair. The 12 mm figure is the width of a single bearing; the pair occupies 24 mm of shaft length when clamped together.

Interchange guidance

Direct super-precision equivalents on the 7005 envelope at 15° with light preload: FAG B7005-C-T-P4S-UL, SKF 7005 CD/P4ADGA, NSK 7005CTRDULP4, NTN 7005UCG/GNP4, RHP 7005CTDULP4 and Koyo 7005C P4 DUL. SNFA VEX 25 /NS 7CE1 shares the 15° angle and envelope. A standard-tolerance 7005-C shares the envelope and angle only. Searchable variants include 2MM9105WIDUL, 2MM-9105-WI-CR-DUL-C1, 2 MM 9105 WI CR DUL and 2MM9105WICRDUL.