FAGSuper Precision Spindle Bearing – 12 mm Bore, 28 mm OD, 8 mm Width, 15° Contact Angle, P4 Class, Light Preload, Duplex Universal

Product Description

What this part is

A FAG/Barden B7001-CB-TP4-DUL super-precision spindle bearing: a single-row angular contact ball bearing, 12 mm bore by 28 mm outside diameter by 8 mm wide, open on both faces, with a 15° contact angle, P4 accuracy and a machined phenolic window cage. It is universally ground to duplex light preload, so pieces of the same designation set against each other directly.

Decoding the designation

The leading B denotes the standard-size steel ball complement. 70 is the extra light dimension series and 01 gives the 12 mm bore. C is the 15° contact angle. TP is the fabric-base laminate phenolic cage. P4 is ISO accuracy class 4, equivalent to ABEC 7. DUL is duplex universal grinding with light preload.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness, giving a reference speed of 90,000 rpm and a limiting speed of 60,000 rpm in this size. Dynamic load rating is 4.65 kN, static 1.83 kN, and the fatigue limit load 0.188 kN. A 25° design in the same envelope would carry more thrust and turn slower, which is the trade this bearing declines in favour of speed.

Cage material and its effect

The phenolic cage is machined from fabric-reinforced laminate and rides on the outer-ring land. Its low mass and porous oil-retaining structure suit sustained high-speed running, with long-term operation to about 100 °C.

Barden and FAG marking

Barden is Schaeffler’s super-precision brand, so this bearing carries both the FAG B7001-CB-TP4-DUL designation and the Barden 101-H number on the one carton. Either number identifies the same bearing.

Quantity and configuration

One bearing, universally ground to duplex light preload. Matched sets are assembled from individual pieces of this designation, back-to-back, face-to-face or in tandem, with the preload established by the ground ring faces rather than by spacers or shims.

Fitting notes

Mounting force is applied only to the ring being fitted. Ring faces carry a match marking that orients the high sides of the outer rings toward each other in an O arrangement. At these speeds cleanliness and lubricant quantity govern life more than load, so the bearing goes to the spindle straight from its wrapper.

Interchange guidance

Barden 101-H is the same bearing under its Barden number. SKF 7001 CD/P4A, NSK 7001CTYNSULP4 and GMN S6001CTA match the envelope, angle and class. The FAG HS7001 variant uses a smaller ball complement for higher speed and lower capacity, so it is a related size rather than a substitution.