FAGB7222CAP4ULSuper Precision Spindle Bearing – Straight Bore, 110 mm ID, 200 mm OD, 38 mm Width, Open, 15° Contact Angle, Light Preload, Phenolic Cage

Product Description

What this part is

FAG B7222CAP4UL super precision radial spindle bearing. Single-row angular contact ball bearing, B72 heavy spindle series, 110 mm bore x 200 mm outside diameter x 38 mm width. Open on both faces. Carton designations: B7222CAP4UL, B7222C, B-7222-CA-P4-UL, B 7222C A P4 UL, and the Fafnir equivalent 2MM222.

Decoding the designation

Series: B72, the heavy section of Schaeffler’s spindle bearing range. Contact Angle: 15°. Cage Material: fabric-base laminate phenolic. Cage Type: machined. Precision Class: P4, equivalent to ABEC 7. Preload: light. Universally matchable, so any two rings of this designation pair into a light-preload set in back-to-back, face-to-face or tandem order.

What these specs mean in practice

The B72 heavy section puts a 200 mm outside diameter and 38 mm width on a 110 mm bore, which buys substantially more radial capacity than a B70 of the same bore. Radial dynamic load rating: 164,000 N. Radial static load rating: 105,000 N. Limiting speed with grease: 6,700 rpm. Limiting speed with oil: 10,000 rpm. Fatigue load limit, radial: 8,900 N. A 15° contact angle favours speed and radial stiffness over thrust capacity. Operating range: -30 °C to 100 °C. Item weight: 10.20 lb.

Stiffness and preload figures

Axial rigidity: 131 N/µm at light preload, 219 N/µm at medium, 311 N/µm at heavy. Preload force: 989 N light, 3,069 N medium, 6,072 N heavy. Lift-off force: 3,060 N light, 10,252 N medium, 21,655 N heavy. Distance between the apexes of the pressure cones: 39.8 mm.

Quantity and configuration

One bearing. Supplied as a universally matchable single ring set, ready to be combined with further pieces of the same designation.

Fitting notes

Straight cylindrical bore, interference fit on the shaft. Shaft shoulder diameter: 126.5 mm. Outer ring shoulder diameter: 183.5 mm. Maximum fillet radius: 1 mm. Minimum chamfer dimension: 2.1 mm. Lubrication pitch diameter range for oil injection: 139.7 mm to 148.7 mm. Preload is set by the matched execution, so this bearing has no radial internal clearance class.

Cross-references

15° spindle bearings of this size: Fafnir 2MM222WI and the current FAG designation B7222-C-T-P4S-UL, which carries the tighter P4S class. SKF 7222 CDGA/P4A matches the angle at extra light rather than light preload. The 25° FAG B7222-E-T-P4S-UL is the same size at 156,000 N dynamic and 100,000 N static, with greater axial stiffness and a lower speed rating.