由于两种金属的膨胀率不同，当温度变化时，恒温制弹簧将卷绕或松开。
Because of differences in the expansion rates of the two metals, the thermostatic spring winds up or unwinds with changing temperature.
本公司主要经营螺钉，螺母，弹簧螺母，螺栓，垫圈，牙棒，金属膨胀螺丝，异型冲压件，非标件，五金工具等。
My company mainly manages the bolt, the nut, the spring nut, the bolt, the gasket, the tooth stick, the expansion of metal screw, the heterogeneous pressing part, non-tender, hardware tool and so on.
平垫片和弹簧垫片，它们安装在防退膨胀管和螺栓六角帽之间的螺杆上；
The flat gasket and the spring gaskets are arranged on the bolt between the ante-receding expansion pipe and the hexagonal cap of the bolt.
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