SKF7220CP4DGASuper-Precision Angular Contact Ball Bearing – 100 mm ID, 180 mm OD, 34 mm Width, 15° Contact Angle, ABEC 7 / P4

Product Description

What this part is

SKF 7220 CDGA/P4A super-precision, high-capacity single-row angular contact ball bearing. Bore Diameter: 100 mm. Outside Diameter: 180 mm. Overall Width: 34 mm. Contact Angle: 15°. Dynamic Load Rating: 156,000 N. Static Load Rating: 137,000 N. Limiting Speed: 7,500 rpm grease; 12,000 rpm oil-air. Precision Class: ABEC 7 / P4. Preload: Extra light. Rolling Elements: Ball. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Series: 7200. Base Number: 7220. Bearing Material: Chrome steel. Unit Quantity: 1 Pc.

Decoding the designation

72 — single-row angular contact ball bearing in the ISO 02 heavy dimension series. The thicker cross-section carries more load than a 70-series bearing of the same bore.

20 — bore code. Bore Diameter: 100 mm.

CD — 15° contact angle, high-capacity super-precision execution.

GA — universally matchable, extra light preload.

P4A — SKF super-precision tolerance class, ABEC 7 equivalent.

Searchable forms of the designation: 7220-CGA/P4, 7220 CDGA/P4A, 7220CD/P4A DGA, 7220-C-P4-DGA, 7220C, 7220CP4DGA.

What these specs mean in practice

Dynamic Load Rating: 156,000 N. Static Load Rating: 137,000 N. Fatigue load limit: 4,900 N. The bearing runs 15 balls of 25.4 mm diameter in a single row, which is where the high-capacity rating comes from.

Contact Angle: 15°. The shallow angle puts the load line close to the radial plane, favouring speed and radial stiffness. It is the angle chosen for machine-tool spindles and precision pump shafts.

Limiting Speed: 7,500 rpm grease; 12,000 rpm oil-air. Oil-air lubrication carries heat out of the ball contact, which is why the figure runs above the grease value.

Preload: Extra light. Extra light preload is the high-speed, low-heat choice.

A universally matchable bearing comes up to its published preload against any other bearing of the same designation, back-to-back, face-to-face or in tandem, with no shimming or grinding.

Mounting data

Bore Diameter: 100 mm, straight. Outside Diameter: 180 mm. Overall Width: 34 mm. Shaft abutment diameter da min 112 mm, db min 112 mm. Housing abutment diameter Da max 168 mm, Db max 173 mm. Fillet radius ra max 2 mm, rb max 1 mm. Chamfer dimension r1,2 min 2.1 mm, r3,4 min 1.1 mm. Inner ring shoulder diameter d1 and d2 124.7 mm, outer ring shoulder diameter D1 155.3 mm. Distance from side face to pressure point a 35.9 mm. Oil nozzle position dn 131.4 mm. Reference grease quantity 40.9 cm³ per bearing.

Quantity and configuration

Unit Quantity: 1 Pc. One universally matchable single bearing, open on both faces.

Interchange guidance

Cross-Reference 1: SKF 7220 CD/P4A. Cross-Reference 2: FAG B7220-C-T-P4S-UL. Cross-Reference 3: NSK 7220CTRSULP4. Cross-Reference 4: NTN 7220C/GNP4. Cross-Reference 5: Timken / Fafnir 2MM220WI. Cross-Reference 6: RHP 7220CTSUEP4. Cross-Reference 7: Koyo 7220C/P4. Cross-Reference 8: SNR 7220CVUJ74. Cross-Reference 9: MRC 7220 (related, 29°).

The first eight share the 100 x 180 x 34 mm envelope and the 15° contact angle and are direct substitutions at matching precision class. The MRC 7220 shares the envelope at a 29° angle, so it is a related size rather than an interchange.