UNI5909双头螺柱意标螺丝

GB953C级等长双头螺柱

GB900双头螺柱不等长螺柱

GB899双头螺柱国标螺柱

GB898双头螺柱国标螺柱

DIN835德标双头螺柱

DIN940双头螺柱

JISB 1173日标双头螺柱

HG/T20613钢制管法兰用紧固件全螺纹螺柱

GB901哈氏HastelleyB3螺栓螺母螺柱

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GB901等长双头螺柱国标