Fafnir3MM9110WIDULSuper-Precision Angular Contact Ball Bearing Pair – 50 mm Bore, 80 mm OD, 16 mm Width, 25°, Light Preload

Product Description

What this part is

Fafnir 3MM9110WICRDUL, a super-precision angular contact ball bearing supplied as a universally ground duplex pair. Bore Diameter: 50 mm. Outside Diameter: 80 mm. Overall Width: 16 mm per bearing. Total Width: 32 mm mounted as a pair. Contact Angle: 25°. 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: 3MM9110WI. GTIN: 087796072480.

Decoding the designation

3MM — Fafnir super-precision spindle range at a 25° contact angle, ground to ABEC 7/9 (P4S) tolerances.

9110 — the 9100 light dimension series, bore code 10, which maps to the ISO 7010 envelope: 50 mm bore, 80 mm outside diameter, 16 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: 26,300 N per bearing. Static Load Rating: 19,700 N per bearing. Limiting Speed: 16,200 rpm grease; 29,400 rpm oil. Item Weight: 0.516 kg (1.14 lb) for the pair. Internal Clearance: N/A — a preloaded set is clamped to a defined stiffness rather than run to a clearance. The 25° contact angle carries more thrust and locates the shaft more firmly than the 15° execution on the same envelope, and gives up speed for it: 29,400 rpm on oil against 32,600 rpm for the 2MM form. Light preload keeps running heat down.

Mounting data

Shaft Backing Shoulder Diameter: 56.1 mm. Housing Backing Shoulder Diameter: 74.2 mm. Maximum Housing Fillet Radius: 1 mm (0.039 in) — the largest housing corner radius the bearing corners will clear.

Quantity and configuration

Unit Quantity: 2 Pcs. One universally ground duplex pair. The 16 mm figure is the width of a single bearing; the pair occupies 32 mm of shaft length when clamped together.

Interchange guidance

Direct super-precision equivalents on the 7010 envelope at 25° with light preload: FAG B7010-E-T-P4S-UL, SKF 7010 ACD/P4ADGA, NSK 7010A5TRDULP4, NTN 7010UAD/GNP4, RHP 7010ETDULP4 and Koyo 7010A5 P4 DUL. SNFA VEX 50 /NS 7CE3 shares the 25° angle and envelope. A standard-tolerance 7010-A shares the envelope and angle only. Searchable variants include 3MM9110WIDUL, 3MM-9110-WI-CR-DUL, 3 MM 9110 WI CR DUL and 3MM9110WICRDUL.