Fafnir3MMV9115WISULAngular Contact Ball Bearing – Straight Bore, 75 mm ID, 115 mm OD, 20 mm Width, Open, 25° Contact Angle, Light Preload

Product Description

What this part is

Fafnir 3MMV9115WI-CR-SUL super precision angular contact ball bearing. Series: 9100WI. Base Number: 9115. Bore Diameter: 75 mm. Outside Diameter: 115 mm. Overall Width: 20 mm. Contact Angle: 25°. Precision Class: ABEC 7 / P4. Precision Rating: ISO P4S (ABEC 7/9). Cage Material: Phenolic. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Number Of Rows: 1. Preload: Light. Mounting Arrangement: Universal. Item Weight: 0.64 kg (1.41 lb).

Decoding the designation

3MM — Fafnir super precision execution at a 25° contact angle.

V — the P4S tolerance class. Running accuracy and performance are held to ABEC 9 / ISO P2 while the remaining features are held at ABEC 7 / ISO P4, and the bore and outside diameter are micron-coded so the bearing can be selectively fitted to the shaft and housing.

9115 — 9100WI dimension series at a 75 mm bore. The ISO equivalent is 7015.

WI — low shoulder on both rings, the form used for duplex mounting.

CR — phenolic cage.

SUL — a single bearing, universally ground so it will pair with another of the same designation, at light preload.

What these specs mean in practice

Dynamic Load Rating: 48,900 N. Static Load Rating: 41,200 N. Limiting Speed: 11,000 rpm grease; 19,800 rpm oil.

Contact Angle: 25°. A 25° angle carries more thrust and gives higher axial rigidity than a 15° bearing on the same envelope, at a lower speed ceiling. It is the angle chosen where spindle loading is predominantly thrust.

Cage Material: Phenolic. Fabric-base phenolic is light and low in inertia, so the cage tolerates rapid acceleration and reversal, and the material itself holds oil.

Preload: Light. Mounting Arrangement: Universal. Universal grinding means two or more of these bearings stack in any arrangement — back to back, face to face or tandem — and arrive at the designed light preload from the ground faces alone.

Precision Class: ABEC 7 / P4. Item Weight: 0.64 kg (1.41 lb).

Mounting data

Max Housing Fillet Radius: 1 mm. Shaft Backing Shoulder Diameter: 82.7 mm. Housing Backing Shoulder Diameter: 107.3 mm.

Quantity and configuration

Unit Quantity: 1 Pc. One universally ground single bearing.

Interchange guidance

The ISO designation for this envelope is 7015 at P4 precision. A substitution holds where the contact angle is 25°, the precision class is P4 or P4S, the preload is light and the bearing is universally ground. A 15° 7015 shares the same 75 x 115 x 20 mm seat but behaves differently under thrust, so it is a related size rather than an interchange.