中文 
It is a connecting piece composed of a foot ball and a ring.
| Catalog No. | Dimensions (mm) | Rated Failing load (kN) | Weight (kg) | |||||
| ∅ | b | d | d1 | h | h1 | |||
| Q-7 | 22 | 16 | 17 | 33.3 | 50 | 13.4 | 70 | 0.3 |
| QP-7 | 20 | 16 | 17 | 33.3 | 50 | 13.4 | 70 | 0.3 |
| QP-10 | 20 | 16 | 17 | 33.3 | 50 | 13.4 | 100 | 0.3 |
| QP-12 | 24 | 18 | 17 | 33.3 | 60 | 13.4 | 120 | 0.4 |
| QP-16 | 26 | 20 | 21 | 41 | 60 | 19.5 | 160 | 0.5 |
| QP-16G | 26 | 18 | 21 | 41 | 60 | 19.5 | 160 | 0.5 |
| QP-21 | 30 | 24 | 25 | 49 | 80 | 21 | 210 | 1 |
| QP-21D | 30 | 24 | 21 | 41 | 70 | 19.5 | 210 | 0.9 |
| QP-21S | 26 | 20 | 21 | 41 | 80 | 19.5 | 210 | 0.7 |
| QP-25 | 33 | 28 | 25 | 49 | 80 | 21 | 250 | 1.1 |
| QP-25S | 30 | 24 | 25 | 49 | 80 | 21 | 250 | 1 |
| QP-30 | 39 | 28 | 25 | 49 | 80 | 21 | 300 | 1.1 |
| QP-32S | 33 | 28 | 25 | 49 | 80 | 21 | 320 | 1.2 |
| QP-4228G | 39 | 32 | 29 | 57 | 100 | 23.5 | 420 | 1.5 |
| QP-55G | 45 | 32 | 33 | 65 | 110 | 27 | 550 | 2.6 |
| QP-55S | 45 | 36 | 33 | 65 | 110 | 27 | 550 | 2.7 |
