Fafnir2MM9116WIDUHAngular Contact Ball Bearing – 80 mm ID, 125 mm OD, 22 mm Width, Open, 15° Contact Angle, Phenolic Cage, Heavy Preload, ABEC 7/9 P4S

Product Description

What this part is

Fafnir 2MM9116WICRDUH is a super-precision angular contact ball bearing supplied as a matched duplex pair. Bore Diameter: 80 mm. Outside Diameter: 125 mm. Overall Width: 22 mm. Contact Angle: 15°. Bore Type: Straight. Closure Type: Open. Rolling Elements: Ball. Number Of Rows: 1 per bearing. Cage Material: Phenolic. Bearing Material: Bearing steel. The envelope is the ISO 7016 size, and Timken’s own world part number for it is 7016C-T-P4S-DUH.

Decoding the designation

2MM — Timken Fafnir super-precision at a 15° contact angle. The 2 prefix carries the angle; MM is the P4S precision grade, which holds ABEC 9 / ISO P2 running accuracy on an ABEC 7 / ISO P4 body.

9116 — the 9100WI dimension series at bore code 16, which is ISO 70-series size 7016 at 80 x 125 x 22 mm.

WI — Timken’s standard angular contact construction: full shoulders on both sides of the inner ring and a low shoulder on the outer ring.

CR — phenolic composition cage, Timken’s standard cage for super-precision spindle bearings. It is the T in the ISO world number 7016C-T-P4S-DUH.

DUH — duplex universal, heavy preload. Two bearings ground as a matched set with flush faces, so the pair mounts back to back, face to face or in tandem.

What these specs mean in practice

Dynamic Load Rating: 64,900 N per bearing. Static Load Rating: 55,200 N per bearing. Both are Timken C1 and C0 values for a single bearing.

Limiting Speed: 10,300 rpm grease; 20,600 rpm oil. Lubricant: Grease or oil.

Contact Angle: 15°. A shallow angle favours speed and radial stiffness over axial capacity, which is the trade a machine tool spindle wants.

Preload: Heavy. Heavy preload raises spindle stiffness and holds the ball complement in controlled contact through load reversals, at the cost of running temperature.

Precision Class: ABEC 7/9 / P4S. Super-precision grinding holds bore, outside diameter and raceway running accuracy far tighter than a standard-class bearing, which is what keeps spindle runout and running vibration low at speed.

Mounting data

Bore Diameter: 80 mm. Outside Diameter: 125 mm. Overall Width: 22 mm. Shaft Backing Shoulder Diameter: 88.5 mm (3.490 in). Housing Backing Shoulder Diameter: 116.5 mm (4.590 in). Maximum housing fillet radius that the bearing corners will clear: 1 mm (0.039 in). Item Weight: 1.718 kg (3.78 lb) for the matched pair, 0.859 kg per bearing.

Quantity and configuration

Unit Quantity: 2 Pcs. Mounting Arrangement: Duplex universal (DU). Series: 2MM9100WI. Base Number: 2MM9116WI. GTIN: 087796072855. Harmonization Code: 8482.10.50.28.

Interchange guidance

The ISO 7016 envelope at 15° and P4-class precision is made by every major super-precision manufacturer, and the equivalents are listed in the cross-reference fields. Match on preload as well as angle: a DUH pair is ground to heavy preload and a DUL or DUM pair to light or medium.