FAGB71912ETPAP4ULSuper-Precision Angular Contact Ball Bearing 60 x 85 x 13 mm, 25° Contact Angle, P4S, Light Preload

Product Description

What this part is

A single-row super-precision angular contact ball bearing, 60 mm bore by 85 mm outside diameter by 13 mm wide, in the 719 extremely-light dimension series. It is a machine-tool spindle bearing: high running accuracy, high speed capability, and combined radial and one-direction axial load capacity.

Decoding the designation

B — standard steel ball complement.
719 — extremely light dimension series.
12 — 60 mm bore size code.
E — 25° contact angle in the FAG scheme.
TPA — glass-fibre-reinforced polyamide cage, ball-riding.
P4S — super-precision accuracy, ABEC 7 dimensional with ABEC 9 running accuracy.
UL — single bearing, universally ground, light preload when mounted against another UL bearing of the same designation.

What these specs mean in practice

A 25° contact angle carries more thrust and less speed than the 15° C variant of the same envelope. On a spindle taking heavy cutting thrust, the 25° angle is the stiffer choice axially; where top speed governs, the 15° B71912-C is the counterpart.

Universal grinding is what makes the bearing arrangement-flexible: the faces are ground so that two or more pieces of the same designation set the intended preload in any of DB, DF or DT stacking, with no spacers ground to order. Light preload favours speed and thermal headroom; medium and heavy preload trade both for axial stiffness.

The polyamide cage runs quietly and tolerates momentary lubrication starvation better than machined brass, at the cost of a temperature ceiling around 120 °C continuous.

Published ratings and mounting data

Bore: 60 mm (2.3622 in)
Outside diameter: 85 mm (3.3465 in)
Width: 13 mm (0.5118 in)
Contact angle: 25°
Basic dynamic load rating C: 23.4 kN
Basic static load rating C0: 15.2 kN
Fatigue limit load: 1.56 kN
Reference speed: 22,000 rpm
Limiting speed: 14,000 rpm
Mass: 0.19 kg
Rows: 1
Closure: open, both faces
Internal clearance: standard, set by preload on mounting

Quantity and configuration

Single bearing, 1 Pc. Universally ground, so it can be run alone or matched with further UL pieces of the same designation.

Fitting notes

Super-precision angular contact bearings mount on ground and hardened shaft and housing seats to matching tolerance; the accuracy of the bearing is only realised on seats held to it. The high shoulder side of the outer ring identifies thrust direction, and in a duplex stack the marked faces go together according to the intended DB, DF or DT arrangement. Mounting is by controlled press or induction heat on the ring being fitted, never through the ball complement.

Interchange guidance

Direct equivalents at the same 25° angle and P4 class include SKF 7912 ACD/P4A, NSK 7912A5, RHP/Timken 7912E, and the FAG legacy number B7912E.TPA.P4.UL. Related sizes that share the 60 x 85 x 13 mm envelope but are a different part: B71912-C (15°), HS71912-C (15° high-speed), and any DUL, DUM or DUH matched pair, which is two bearings at a set preload rather than one universally ground single.