Specification summary of DIN 628 (angular contact ball bearings) as it applies to 7300c series angular contact ball bearings: what the document fixes, where its scope ends, the ISO, DIN and GB/T equivalents, and the dimensions supplied to it.
DIN 628 — Scope
DIN 628 is the German standard for angular contact ball bearings, restating the ISO 15 envelope for the type: part 1 the single row 7000 series, part 3 the double row 3200 and 3300 series, and part 4 the four-point contact QJ bearings.
What DIN 628 Does Not Fix
It fixes the envelope, not the contact angle variants a manufacturer offers, the preload class of a matched set, or the load rating — the first is a design choice, the second is agreed on the order and the third is ISO 281.
This division of labour is the thing to carry away from any bearing standard. A boundary dimension standard makes bearings interchangeable; it does not make them equivalent. Two bearings of the same designation from different makers mount in the same seat and are not required to have the same load rating, the same internal design, the same cage or the same speed limit.
Dimensions Supplied to DIN 628
| Designation | Bore d (mm) | Outer diameter D (mm) | Width B (mm) | Chamfer r min (mm) | Contact angle a (deg) |
|---|---|---|---|---|---|
| 7300C | 10 | 35 | 11 | 0.6 | 15 |
| 7301C | 12 | 37 | 12 | 1 | 15 |
| 7302C | 15 | 42 | 13 | 1 | 15 |
| 7303C | 17 | 47 | 14 | 1 | 15 |
| 7304C | 20 | 52 | 15 | 1.1 | 15 |
| 7305C | 25 | 62 | 17 | 1.1 | 15 |
| 7306C | 30 | 72 | 19 | 1.1 | 15 |
| 7307C | 35 | 80 | 21 | 1.5 | 15 |
| 7308C | 40 | 90 | 23 | 1.5 | 15 |
| 7309C | 45 | 100 | 25 | 1.5 | 15 |
| 7310C | 50 | 110 | 27 | 2 | 15 |
| 7311C | 55 | 120 | 29 | 2 | 15 |
| 7312C | 60 | 130 | 31 | 2.1 | 15 |
| 7313C | 65 | 140 | 33 | 2.1 | 15 |
| 7314C | 70 | 150 | 35 | 2.1 | 15 |
| 7315C | 75 | 160 | 37 | 2.1 | 15 |
| 7316C | 80 | 170 | 39 | 2.1 | 15 |
| 7317C | 85 | 180 | 41 | 3 | 15 |
| 7318C | 90 | 190 | 43 | 3 | 15 |
| 7319C | 95 | 200 | 45 | 3 | 15 |
| 7320C | 100 | 215 | 47 | 3 | 15 |
National Equivalents
ISO 15 internationally; GB/T 292 for single row and GB/T 296 for double row in China.
This product is supplied against ISO 15 / DIN 628-1 / GB/T 292, which names the documents it is made to.
When to Cite DIN 628
DIN 628 remains in daily use in European mechanical engineering and on legacy drawings, and it is what many German-language datasheets cite. For a new design the ISO document is the better contractual reference, with the DIN number carried alongside it so that the drawing reads the same to everyone.
