Types of ball towing hooks
| No. | Classification criterion | Type | Examples |
|---|---|---|---|
| 1 | Units and values of the ball diameter | In mm (Ds = 50) | Fig. g |
In inches (Ds = 1 , 2, 2 , 3) | – | ||
| 2 | Body shape | Straight | Fig. a, b, e, f |
| Curved | Fig. c, d | ||
| 3 | Type of connection to the towing device | Permanent (welded) | Fig. e |
| Removable, threaded joint | Fig. a, b | ||
| Removable, two-hole flange | Fig. c | ||
| Removable, four-hole flange | Fig. d | ||
| 4 | Integration of the ball | One-piece | Fig. a, b, c, d, e |
| Assembled | Fig. f | ||
| 5 | Blank type | Rolled bar | Fig. b, e, f |
| Forged, cast | Fig. a, c, d |
Examples of ball towing hooks
 |  |  |
| a | b | c |
 |  |  |
| d | e | f |
Recommended dimensions (Annex.1.1.1.1)
g