螺丝紧固件的拉张力随其径长呈平方增长，其扭矩则呈立方增长。
The strength of a screw fastener increases with the square of its diameter.
本发明一般地涉及驱动套头，并且更具体地涉及用于固定及螺丝紧固件的经改进驱动套头设计。
The invention generally relates to a drive socket and more particularly to an improved drive socket design for fixation and a screw fastener.
配有安全扣的全面部遮阳面罩，配有螺丝紧固件，以及泡沫密封条，遮阳面罩可以容易地安装在头盔及卸除。
Polycarbonate full-face visor complete with peak and safety latch. Supplied with screw fasteners, and a foam sealing strip, the visor can be easily attached and removed from the helmet.
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