1、 英美制螺丝规格说明4#- 40 *1/2螺纹直径 牙数 长度表示螺纹直径为4#，算成公制即2.84mm。牙数为40圈，即1英寸长的距离有40圈螺纹，换算成公制牙距为25.4mm/40=0.635mm。长度为1/2英寸，换算成公制即0.5*25.4=12.7mm。注：数值为单批次人工测量，存在一定误差，请以实物为准，介意者慎拍或联系客服！单位：mm规格牙数dk K 3/16247.84.51/4209.565/161810.97.91/8405.535/32326.23.87/161415.6111/212(13)1912.55/8112215.53/816149.410#327.758#32
2、6.74.26#325.53.54#404.52.72#563.620#802.61.5公制英制螺纹牙距表公制牙距英制美制称呼牙数粗牙细牙极细牙粗牙细牙韦氏牙M30.50.354#1.94048M40.70.56#3.53240M50.80.58#4.23236M61.00.7510#4.82432M710.7512#5.52428M81.251.00.751/46.35202820M101.51.251.05/167.94182418M121.751.51.253/89.53162416M142.01.51.07/1611.11142014M162.01.51.01/212.7132012M182.52.01.59/1614.29121812M202.52.01.55/815.86111811M222.52.01.53/419.05101610M243.02.01.57/822.239149M273.02.01.5125.48128
