螺纹下孔径表(无屑丝攻用)

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1、螺紋下孔徑表(無屑絲攻用)公制螺紋(NRT)(單位：mm)螺紋尺寸1級螺紋用下孔徑2級螺紋用下孔徑RH精度最小～最大(配合率％)RH精度最小～最大(配合率％)M1×0.2520.87~0.89(100~85)40.90~0.92(100~80)1.1×0.2520.97~0.99(100~85)41.00~1.02(100~80)1.2×0.2521.07~1.09(100~85)41.10~1.12(100~80)1.4×0.321.244~1.263(100~85)41.270~1.294(10

2、0~80)1.7×0.3521.51~1.54(100~80)41.54~1.58(100~75)2×0.421.78~1.82(100~80)41.81~1.85(100~75)2.3×0.422.08~2.12(100~80)42.11~2.15(100~75)2.5×0.4522.25~2.29(100~80)42.28~2.33(100~75)2.6×0.4522.35~2.39(100~80)42.38~2.43(100~75)3×0.532.74~2.78(100~80)52.76~2.

3、81(100~75)3.5×0.633.18~3.21(100~85)53.20~3.26(100~75)4×0.743.63~3.67(100~85)63.65~3.70(100~85)5×0.844.57~4.62(100~85)64.59~4.66(100~80)6×145.45~5.51(100~85)75.48~5.57(100~80)7×146.45~6.51(100~85)76.48~6.57(100~80)8×1.2557.31~7.38(100~85)77.34~7.41(100~

4、85)8×147.45~7.51(100~85)77.48~7.57(100~80)10×1.559.16~9.22(100~90)79.18~9.28(100~85)10×1.2559.31~9.38(100~85)79.34~9.41(100~85)10×159.46~9.52(100~85)79.48~9.57(100~80)12×1.75511.01~11.08(100~90)811.05~11.15(100~85)12×1.5511.16~11.22(100~90)711.18~11.28

5、(100~85)12×1.25511.31~11.38(100~85)711.34~11.41(100~85)12×1511.46~11.52(100~85)711.48~11.57(100~80)14×2612.83~12.95(100~90)1012.92~13.04(100~85)14×1.5513.16~13.22(100~90)913.21~13.30(100~85)16×2614.87~14.95(100~90)1014.92~15.04(100~85)16×1.5515.16~15.2

6、2(100~90)915.21~15.30(100~80)18×2.5616.57~16.67(100~90)1116.63~16.78(100~85)18×1.5617.17~17.23(100~90)1017.22~17.31(100~85)20×2.5618.57~18.67(100~90)1118.63~18.78(100~85)20×1.5619.17~19.23(100~90)1019.22~19.31(100~85)螺紋下孔徑表(無屑絲攻用)美制粗牙螺紋(NRT)(單位：mm)螺紋尺寸

7、2B級螺紋用下孔徑3B級螺紋用下孔徑RH精度最小～最大(配合率％)RH精度最小～最大(配合率％)NO.2-56UNC41.96~2.02(100~65)31.95~2.01(100~65)3-4842.25~2.32(100~65)32.23~2.31(100~65)4-4052.52~2.60(100~70)32.50~2.58(100~70)5-4052.86~2.93(100~70)32.83~2.91(100~70)6-3253.09~3.17(100~75)33.06~3.14(100~7

8、5)8-3263.75~3.83(100~75)43.74~3.82(100~75)10-2464.26~4.35(100~80)44.24~4.32(100~80)12-2464.92~5.01(100~80)44.90~4.96(100~85)1/4-2065.66~5.76(100~80)45.64~5.74(100~80)5/16-1877.18~7.29(100~80)57.15~7.24(100~85)3/8-1678.66~8.78(100~80)58.