jamb GRE

the edge of the door and jamb

门和柱的边缘

Bolts and studs installed at the factorywill either have the nuts cemented on or use a second nut as a jamb（误，应为 jam） nutso that re-tightening should not be necessary.

安装在这个工厂的栓和柱或者具有用胶粘合的母，或者使用第二个母作为防松母，使得不需要再次拧紧。