This standard deals with deep offset double head box wrenches with unequal openings; it includes the dimensions and the designation of these wrenches. The deep offset double head box wrenches have to comply with the test torques series A according to DIN 899.
DIN 838:1987 history
2007DIN 838:2007-09 Box wrenches, double head - Test torques series A
2007DIN 838:2007 Box wrenches, double head - Test torques series A
1987DIN 838:1987 Box wrenches, double head, deep offset, with unequal openings; test torques series A