din 661
*all measurements in millimeters (mm)*
| d | d1 | k |
| 2 | 3.5 | 1 |
| 3 | 5.2 | 1.4 |
| 4 | 7 | 2 |
| 5 | 8.8 | 2.5 |
| 6 | 10.5 | 3 |
| 8 | 14 | 4 |
all information is strictly informative
contact: lizhong.deng
phone: 13928071304
tel: 0756-8586520
email: lizhong@zhjiali.com
add: mingzhubeilu388haochangshaxinyun56-301,xiangzhou area,zhuhai city,guangdong province,china.