螺栓螺母尺寸对照表螺栓直径及对应螺母含义解释丝杆直径,螺母外直径,内六角平行直径 M:丝杆直径,S:螺母外直径,J:内六角直径 (M),(S),(J) M2,4mm,1.5mm M2.5,5mm,2mm M3,5.5mm,2.5mm M4,7mm,3mm M5,8mm,4mm M6,10mm,5mm M8,13mm,6mm MI0,17mm,8mm MI