| 摘要 |
A screw providing increased strip torque in sheet metal panels, comprises a helical ramp 20 formed as an extension to the thread 22 and partially surrounded by a recess 18 in the lower surface 16 of the head 12. The material of the tapping panel 28 is drawn upwards through the clearance hole 31 in the bearing panel 26 into engagement with the helical ramp 20. The farther up the surface of the ramp the material of the tapping panel is drawn, the greater the magnitude of the stripping torque. <IMAGE> |
