Fafnir2MM9308WISULSuper-Precision Angular Contact Ball Bearing – 40 mm Bore, 62 mm OD, 12 mm Width, 15°, Phenolic Cage

Product Description

What this part is: Fafnir 2MM9308WICRSUL, a single super-precision angular contact ball bearing ground for universal matching. Bore Diameter: 40 mm. Outside Diameter: 62 mm. Overall Width: 12 mm. Contact Angle: 15°. Rolling Elements: Ball. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Cage Material: Phenolic. Precision Class: ABEC 7/9 / P4S. Preload: Light. Series: 9300WI. Base Number: 2MM9308WI. GTIN: 087796325456. Decoding the designation: 2MM — Fafnir super-precision spindle range at a 15° contact angle, ground to ABEC 7/9 (P4S) tolerances. 9308 — the 9300 extra-light dimension series, bore code 08, which maps to the ISO 71908 envelope: 40 mm bore, 62 mm outside diameter, 12 mm width. The 9300 series is a separate mapping from the 9100 series, which lands on ISO 70xx. WI — low shoulder on both rings. CR — phenolic cage. SUL — single bearing, universally ground, light preload grade. Two or more can be clamped together in any face orientation and will take up the light preload. What these specs mean in practice: Dynamic Load Rating: 16,000 N. Static Load Rating: 11,700 N. Limiting Speed: 22,400 rpm grease; 44,800 rpm oil. Item Weight: 0.110 kg (0.25 lb). The extra-light 9300 section puts a thin cross-section on a 40 mm shaft, which is what makes the very high speed figure possible. A 15° contact angle favours speed and radial rigidity over thrust capacity. Mounting data: Shaft Backing Shoulder Diameter: 44.6 mm. Housing Backing Shoulder Diameter: 57.9 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: 1 Pc. One single-row bearing, universally ground so it can run alone or be stacked back-to-back, face-to-face or in tandem with siblings of the same grade. Interchange guidance: Direct super-precision equivalents on the 71908 envelope at 15°: FAG B71908-C-T-P4S-UL, SKF 71908 CD/P4A, NSK 7908CTRSULP4, NTN 7908UCG/GNP4, RHP 7908CTSULP4 and Koyo 7908C P4. SNFA SEA 40 7CE1 shares the 15° angle on the same section family. A standard-tolerance 71908C shares the envelope and angle only. Searchable variants include 2MM9308WISUL, 2MM-9308-WI-SUL, 2 MM 9308 WI CR SUL, 2MM9308WICRSUL, 7908C and 71908C.