FAGB7007EBTP4SDULMatched Pair Super-Precision Spindle Bearings, 35x62x14 mm Each, 25° Contact Angle, Light Preload, P4S, Phenolic Cage

Product Description

What this part is

A duplex, universally ground matched pair of FAG super-precision spindle bearings, 35 mm bore by 62 mm outside diameter by 14 mm wide per bearing. The B-prefix range is FAG’s dedicated high-speed spindle bearing family — separate from ordinary 7000-series angular contact bearings, with tighter tolerances, controlled preload and a cage built for speed.

Decoding the designation

B7007 — FAG spindle bearing, 70 dimension series, 35 mm bore
E — 25° contact angle in FAG’s spindle-bearing scheme (C would be 15°)
B — both-side shoulder / spindle-bearing execution
T — machined fabric-reinforced phenolic cage
P4S — FAG super-precision class, tighter running accuracy than plain P4 (broadly ABEC 7/9 territory)
DUL — duplex, universally ground, light preload; mountable DF, DB or DT with no shimming

The carton cross-reference 3MM9107WIDUL corroborates the angle independently: in Fafnir/Timken world numbering the 3MM prefix means 25°, and it also implies P4S rather than plain P4. Two schemes, same answer.

Correcting the source data

The source record gave two different countries of origin — the United States in the title and Germany in the body. Neither is supported by a documented marking, so no origin is claimed. The generic “automotive, industrial, machinery” application list has also gone: a 25° P4S spindle bearing is a machine-tool part, and casting it as automotive brings the wrong traffic.

What these specs mean in practice

25° is the middle of the spindle-bearing range. Against a 15° bearing it roughly doubles axial load capacity and axial stiffness — which is what you want when the cut pushes along the spindle axis, as in drilling, plunge milling or a boring head — while giving up some of the top-end speed and running a little warmer. Light preload keeps that heat manageable. The phenolic cage is what makes high speed survivable: light, quiet, and forgiving for a moment when the oil supply hiccups. It does cap operating temperature, so this is not a high-temperature bearing.

Published ratings and mounting data

FAG does not publish basic dynamic and static load ratings for this designation in a source we could verify directly, so no figures are given rather than borrowing them from the 15° B7007-C variant, whose ratings are genuinely different. Boundary dimensions 35 x 62 x 14 mm per bearing are confirmed; the pair stacks to 28 mm overall width.

Quantity and configuration

One matched pair — two bearings — ground together to give light preload as a set. The stock quantity counts pairs, not pieces. Splitting the pair loses the preload the set was ground for, so do not mount these as two unrelated singles.

Interchange guidance

Direct-scheme equivalents at 25° light preload: Fafnir/Timken 3MM9107WIDUL (this carton’s own number), NSK 7007A5TYNDULP4 (A5 = 25° in NSK’s scheme — note that NSK’s plain A means 30°, so 7007A is not equivalent), NTN 7007A5 with GD2GL-type suffixes, and SKF 7007 ACDGA/P4A (SKF AC = 25°). The suffix letters mean different angles in every brand, which is exactly how a 15° bearing ends up in a spindle specified for 25°; always read the angle from the maker’s own scheme.