FAGB7004CTP4SDULSuper-Precision Angular Contact Ball Bearing Matched Pair – Straight Bore, 20 mm ID, 42 mm OD, 12 mm Width Each, Open, 15° Contact Angle, Universal Light Preload, 2 Pcs.

Product Description

What this part is

FAG B7004CT.P4S.DUL super-precision angular contact ball bearings, supplied as a matched pair. Each bearing has a 20 mm bore, 42 mm outside diameter and 12 mm width, single row, open. Fifteen-degree contact angle, ABEC 7/9 precision, phenolic laminate cage, universally ground for light preload.

Decoding the designation

B7 is the Schaeffler super-precision spindle bearing series, 70 the dimension series and 04 the bore code for 20 mm. C is the FAG 15° contact angle. T is the phenolic cage. P4S is a precision class above plain P4, covering ABEC 7 to ABEC 9 tolerances. DUL breaks down as duplex, universally ground, light preload — two bearings ground as a set.

What these specs mean in practice

The 15° angle sits at the high-speed, low-thrust end of the range, trading axial capacity for running speed and radial stiffness. Limiting speed 36000 rpm. Per bearing, load ratings are 11.9 kN dynamic and 6.55 kN static. The phenolic cage is light and self-lubricating, which suits very high speed with oil mist or a light grease charge, to a ceiling around 120 °C.

Preload and arrangement

Universal grinding lets the two bearings be assembled back-to-back, face-to-face or in tandem and reach the specified preload without shims or ground spacers. Light preload gives the least friction and heat rise of the preload grades; back-to-back gives the widest effective bearing span and the highest moment stiffness, face-to-face the narrowest, and tandem doubles the axial capacity in one direction.

Quantity and configuration

2 Pcs — one matched pair, universally ground, open on all faces.

Fitting notes

The high points and the contact angle direction are marked on the outer ring faces; arrangement is set by ring orientation as the pair goes together. Both rings are clamped square against ground shoulders so the ground preload is not distorted. At this precision class, journal and housing bore geometry carry straight through to spindle runout.

Interchange guidance

SKF 7004 CD/P4ADGA is the same envelope, 15° angle, precision level and universally matched light-preload pairing. NSK 7004CTYNDULP4 matches on angle, class and pairing but uses a polyamide cage in place of the phenolic. A single bearing in this envelope, or one at medium or heavy preload or a 25° angle, is a related size rather than a substitution.