沉头孔参数表(GB)通孔G(松)通孔G(中)通孔G(紧),5,6,8,10,12,16,,5,6,8,10,12,16,20,,6,8,10,12,16,20,25,,8,10,12,16,20-40(+5),10,12,16,20-50(+5),12,16,20-60(+5),16,20-70(+5),,20-70(+5),80,90,100A,沉头孔安装内六角螺丝长度计算公式:L=C+(~)*A(一)B,当采用图二方式连接时,选用螺钉长度计算公式为:L=A+B+C+D+E1,其中A和B为连接件厚度之和;2,C为平垫圈和弹簧垫圈厚度之和定位4mm;3,D为螺母厚度,即为螺栓公称直径(M3,M4,M5等等);(二)4,E为余量(3~5):L=A+B+4+D+4=A+B+D+8
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