螺栓规格低径头部直径头部厚度沉孔直径沉孔深度通孔直径螺母厚度对边宽M2 1.6 3.82 4.53 2.5 1.64 M3 2.4 5.536 3.5 3.5 2.4 5.5 M4 3.25747.5 4.5 4.5 3.27 M5 4.28.559 5.5 5.5 4.78 M6510611 6.5 6.5 5.210 M8 6.8138138.58.5 6.813 M108.516101610.510.58.416 M1210.318121912.512.51118 M141221142616.5171321 M161424161524 M201730201830 M242136242236 M3026.545302646 M3654363155