【建筑】螺旋螺丝钻

screw-worm

hexagonal socket head cap screw

hexagon spline screw driver【机】

outside screw and yoke type

acme screw thread【机】;trapezoidal thread【机】

screw-type dosing machine (worm-type dosing machine)

oval countersunk fillister head wood screw

screw conveyer