Fafnir3MM9316WI-SUXSuper-Precision Angular Contact Ball Bearing – Straight Bore, 80 mm ID, 110 mm OD, 16 mm Width, Open, 25° Contact Angle, Machined Phenolic Cage.

Product Description

What this part is

Fafnir 3MM9316WI-SUX super-precision angular contact ball bearing, ISO 719 extra-light section. Brand: Fafnir (Timken). Part Number: 3MM9316WI-SUX. Bore: 80 mm. Outside Diameter: 110 mm. Overall Width: 16 mm. Total Width: 16 mm. Design Units: Metric. Number Of Rows: 1. Rolling Elements: Steel ball. Bore Type: Straight. Closure Type: Open. Bearing Material: Chrome bearing steel.

Decoding the designation

Contact Angle: 25°. Precision Class: P4S. Precision Rating: ABEC 7/9. Cage Material: Phenolic. Cage Type: CR – phenolic outer land riding. Arrangement / Configuration: Single, universally ground. Series: 9300, Fafnir’s designation for the ISO 719xx extra-light series — a 9316 carries the 71916 envelope.

Load ratings and speeds

Dynamic Radial Load Rating (C1), single bearing: 31,900 N (7,170 lbf). Dynamic Radial Load Rating (C1 ISO, per row): 29,000 N (6,520 lbf). Static Radial Load Rating (C0): 30,500 N (6,860 lbf). Limiting Speed, grease: 11,600 rpm. Limiting Speed, oil: 20,800 rpm. Oil feed roughly doubles the speed ceiling over grease on this size, which is what a high-speed spindle position runs on.

What these specs mean in practice

A 25° contact angle carries more thrust load and holds the shaft more stiffly along its axis than a 15° bearing on the same envelope. The extra-light 719 section fits an 80 mm shaft inside a 110 mm housing bore, so a large-diameter quill can be carried without growing the spindle housing. Internal Clearance: N/A — this bearing is set by preload in the stack rather than by clearance. The phenolic cage rides on the outer ring land, staying centred at spindle speeds and holding lubricant against the ball pockets.

Mounting data

Shaft Backing Shoulder Diameter: 86.1 mm (3.390 in). Housing Backing Shoulder Diameter: 104.4 mm (4.110 in). Maximum Shaft Fillet Radius: 1 mm (0.039 in). Outer Ring “To Clear” Radius: 1 mm (0.039 in).

Quantity and configuration

Unit Quantity: 1 Pc. Mounting Arrangement: Universal. Universally ground faces let the bearing be stacked against another piece of the same designation back-to-back, face-to-face or in tandem, with no shimming or regrinding.

Interchange guidance

Cross-References: SKF 71916 ACD/P4A, FAG B71916-E-T-P4S-UL, NSK 71916A5, Timken 71916. Each shares the 80 x 110 x 16 mm envelope and the 25° contact angle. Harmonization Code: 8482.10.50.68.

Designation variants

MPN Variants: 3MM9316WI-SUX, 3MM9316WISUX, 3MM 9316 WI SUX, 3MM-9316-WI-CR-SUX, 3MM9316WICRSUX, 2MM-9316-WI-CR-SUX, 3MM9316WI.