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Type A angular contact ball bearing
Metric Series (Cross‑section: 8/13/20 mm)
| Model | d (mm) | D (mm) | B (mm) | Type |
|---|---|---|---|---|
| HA2508 | 25 | 41 | 8 | A (30°) |
| HA3008 | 30 | 46 | 8 | A (30°) |
| HA4013 | 40 | 66 | 13 | A (30°) |
| HA5013 | 50 | 76 | 13 | A (30°) |
| HA8020 | 80 | 120 | 20 | A (30°) |
Imperial Series (Cross‑section: 3/16″–1″)
| Model | d (in) | D (in) | B (in) | Type |
|---|---|---|---|---|
| RAA1.000 | 1.000 | 1.375 | 0.1875 | A (30°) |
| RAA2.000 | 2.000 | 2.500 | 0.250 | A (30°) |
| RAA3.000 | 3.000 | 3.625 | 0.3125 | A (30°) |
| RAA4.000 | 4.000 | 4.750 | 0.375 | A (30°) |
Type A angular contact ball bearings are thin‑section, equal‑cross‑section single‑row ball bearings with a standard 30° contact angle. Designed with extra deep ball grooves and a counterbored outer ring, they support radial + unidirectional axial loads and offer higher axial capacity than Type C (radial) or Type X (four‑point) bearings. They must be paired (face‑to‑face/back‑to‑back) for bidirectional thrust and moment loads. Typical features: ABEC 1–7 precision, brass/nylon cage, open/ZZ/2RS seals, GCr15/440C stainless steel. Widely used in robotics, aerospace, medical devices, machine tools
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