FafnirMM9107KSuper-Precision Angular Contact Ball Bearing 35x62x14 mm, ISO 70 Light Series, P4S Precision

Product Description

What this part is

A Fafnir MM9107K super-precision angular contact ball bearing, 35 mm bore by 62 mm outside diameter by 14 mm wide. Fafnir is Timken’s super-precision line.

Decoding the designation

The MM prefix marks the super-precision family and carries P4S precision, equivalent to ABEC 7/9. The leading 9 in 9107 places the bearing in the ISO 70 light dimension series, giving an ISO base number of 7007, and the 07 size code gives a 35 mm bore.

What these specs mean in practice

P4S precision governs running accuracy: radial and axial runout are held to a fraction of a standard-class bearing, which is what allows a spindle to hold form at speed. The ISO 70 light series keeps the section thin for the bore, lowering mass and raising the attainable speed against a 72-series bearing of the same bore.

Quantity and configuration

One bearing.

Fitting notes

Mounting is onto a clean straight journal against a square shoulder. Precision-class bearings are fitted to measured interference rather than by feel, and the ring is driven only on the race being fitted.

Interchange guidance

The ISO base number is 7007, so the size envelope matches a 7007-series angular contact bearing from any maker. A true interchange also has to match contact angle, preload and cage, so a same-envelope 7007 from another brand is a related size until those match.