螺丝攻牙钻孔径和滚造径对照表(攻牙前孔径).xls

文档介绍：螺丝攻牙钻孔径和滚造径对照表公制粗螺纹美制粗螺纹规格标准径 2级牙钻孔径规格(UNC )标准径 2级牙钻孔径最大最小最大最小 × - 64() × - 56() × - 48() × - 40() × - 40() × - 32() × NO8 - 32() × - 24() × - 24() × 1/4 - 20 × 5/16 - 18 × 3/8 - 16 × 7/16 - 14 × 1/2 - 13 × 9/16 - 12 × 5/8 - 11 × 3/4 - 10 × 7/8 -9 × 1 × 1- 1/8 -7 × 1- 1/4 -7 × 1- 3/8 -6 × 1- 1/2 -6