Fafnir2MM219WICRDULSuper Precision Angular Contact Ball Bearing, 95 mm Bore, 170 mm OD, 32 mm Width, Open, 15 Degree Contact Angle, Universally Ground Single, Light Preload

Product Description

What this part is

A Fafnir super-precision single-row angular contact ball bearing, 95 mm bore, 170 mm outside diameter, 32 mm width. Open both faces, machined phenolic cage, bearing steel rings and balls. Fafnir is Timken’s super-precision line, so the bearing carries both names.

Decoding the designation

The leading 2 of 2MM sets a 15° contact angle. MM carries P4S running accuracy, ABEC 7 dimensionally with ABEC 9 tolerances on the critical features. No leading 9 in 219 places the bearing in the ISO 72 dimension series, which is why the 95 mm bore carries a 170 mm outside diameter. CR is the outer-land-riding phenolic cage, SU a universally ground single and L light preload.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness over thrust capacity. A universally ground single reaches its designed preload when clamped flush against another bearing of the same designation, which is what allows sets of two, three or four to be built from singles without shims. Light preload keeps running torque and heat low while removing internal clearance. The 72 series section carries more load than a 70 series bearing on the same bore, at a lower limiting speed.

Quantity and configuration

1 Pc. Universally ground single, open both faces, without snap ring.

Fitting notes

The bearing takes thrust in one direction, so a mounting pairs it against a second bearing or a locating shoulder, with the high side of the outer ring facing the thrust load. Mounting is by cold press or induction heat on the inner ring, with no load path through the balls.

Interchange guidance

Same-spec equivalents are the SKF 7219 CDGA/P4 and the NSK 7219CTYNSULP4. A 3MM219WI is the same envelope at 25°, and SUM or SUH suffixes are the same single at medium or heavy preload; both are related sizes rather than substitutions. A DUL pair is two matched bearings and a different sale unit.