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Deep Groove Ball Bearings: The Industry Default and When to Reach for Something Else
If you pulled a bearing off general industrial equipment at random, there’s a good chance
Availability:
45 in stock
Angular contact ball bearing matched pair, 20 x 37 x 9 mm per bearing, 25° contact angle, extra-light preload, P4A class, SKF 71904-ACX/P4ADGA.
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| MFR / Brand | SKF |
|---|---|
| MPN | 71904-ACX/P4ADGA |
| GTIN | 7316572049785 |
| Model | 71904-ACX-P4A-DGA |
| Bearing Type | Angular Contact Ball Bearing |
| ID | 20 mm (0.7874 in) |
| OD | 37 mm (1.4567 in) |
| Width | 9 mm (0.3543 in) per bearing |
| Series | ISO 19 series (71900) |
|---|---|
| Type | Angular Contact Ball Bearing |
| Preload | Extra light |
| Base Number | 71904 |
| Industry Terms | super precision spindle bearing, machine tool bearing, matched pair, slim section angular contact |
| Bore Shaft Size | 20 mm (0.7874 in) |
| Mpn Variants | 71904-ACX/P4ADGA; 71904ACXP4ADGA; 71904 ACX/P4A DGA; 71904-ACX-P4A-DGA; 7904 |
| Arrangement Configuration | Universal matched pair |
| Precision Class | P4A |
| Precision Rating | P4A |
| Rolling Elements | Ball |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 25° |
| Mounting Arrangement | Universal |
| Part Number | 71904-ACX/P4ADGA |
| Total Width | 18 mm across the pair |
| Cross Reference 1 | SKF 71904 ACDGA/P4A - no X suffix |
|---|---|
| Cross Reference 2 | SKF 71904 ACDGB/P4A - light preload |
| Cross Reference 3 | SKF 71904 CD/P4ADGA - 15 deg contact angle |
SKF 71904-ACX/P4ADGA super-precision angular contact ball bearing, universally matched pair. Two pieces. Bore 20 mm, outside diameter 37 mm, width 9 mm per bearing, 18 mm across the pair. ISO size 71904, also written 7904. Single row per bearing, open.
71904 — ISO 19 dimension series at a 20 mm bore.
AC — SKF code for a 25° contact angle.
P4A — SKF super-precision tolerance and running-accuracy class.
DGA — set of two bearings matched for universal arrangement, extra-light preload, SKF preload class A.
Bore Diameter: 20 mm (0.7874 in). Outside Diameter: 37 mm (1.4567 in). Width: 9 mm (0.3543 in) per bearing. Total Width: 18 mm across the matched pair. Contact Angle: 25°. Preload: Extra light. Precision Class: P4A. Number Of Rows: 1 per bearing. Closure Type: Open. Series: ISO 19 series (71900). Unit Quantity: 2 Pcs. Harmonization Code: 8482.10.50.
Universal matching allows back-to-back, face-to-face or tandem arrangement. Preload is ground into the ring faces, so the pair carries no radial internal clearance class. Mounting Arrangement: universal.
Related SKF designations: 71904 ACDGA/P4A (without the X suffix), 71904 ACDGB/P4A (light preload) and 71904 CD/P4ADGA (15° contact angle). Searchable forms of the designation: 71904-ACX/P4ADGA, 71904ACXP4ADGA, 71904 ACX/P4A DGA, 71904-ACX-P4A-DGA, 7904.
Bore Diameter is 20 mm, Outside Diameter is 37 mm and Width is 9 mm per bearing, 18 mm across the pair.
Contact Angle is 25° (AC code) and Preload is extra light (DGA code).
Two bearings supplied as one universally matched pair.
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