公制美制英制螺纹对照表
公制/美制/英制螺纹对照表
A 型美制螺纹(UNF )常用规格 外螺纹 内螺纹
-4 9/16"-19牙 14.28 13.08 -6 11/16''-16 17.46 16.1 -8 13/16''-16 20.64 19.28 -10 1''-14 25.40 23.57
-12 1(3/16)''-12 30.00 28.32 -16 1(7/16)''-12 36.51 34.67 -20 1(11/16)''-12 42.86 41.02
C 型JIC37度美制UNF 螺纹常用规格 -4 7/16”-20 11.11 10.03 -5 1/2”-20 12.70 11.32 -6 9/16”-18 14.28 13.08 -8 3/4”-16 19.00 17.68 -10 7/8”-14 22.22 20.68 -12 1(1/16)"-12 26.98 25.15 -16 1(5/16)"-12 33.33 31.5 -20 1(5/8)"-12 41.28 39.44 -24 1(7/8)"-12 47.62 45.8 -32 2(1/2)"-12 63.5 61.67
英制圆柱管螺纹(BSPP )常用规格 -4 1/4”-19 13.157 11.55 -6 3/8”-19 16.662 14.95 -8 1/2”-14 20.955 18.63 -12 3/4”-14 26.441 24.11 -16 1”-11 33.249 30.29 -20 1(1/4)''-11 41.91 38.95
英制圆锥管螺纹(BSPT )常用规格 基面大径 基准距离 1/4”-19 13.157 6 3/8”-19 16.662 6.4 1/2”-14 20.955 8.2 3/4”-14 26.441 9.5 1”-11 33.249 10.4 1(1/4)''-11 41.91 12.7
美制圆锥管螺纹(NPT ) 1/8”-27 10.24 4 1/4”-18 13.60 4
3/8”-18 17.04 4.32 1/2”-14 21.22 4.48 3/4”-14 26.57 4.75 1”-11(1/2)” 33.22 4.6 1(1/4)”-11.5 41.96 4.83
2007-4-20 16:33
3/8-16 0.3643 0.3737 0.3287 0.3331 0.2970 8.40 8.44
(0.375-16) 9.2532 9.4920 8.3490 8.4607 7.5438 7/16-14 0.4258 0.4361 0.3850 0.3897 0.3485 9.83 9.87 (0.4375-14) 10.8153 11.0769 9.7790 9.8984 8.8519 1/2-13 0.4876 0.4985 0.4435 0.4485 0.4041 11.34 11.38 (0.50-13) 12.3850 12.6619 11.2649 11.3919 10.2641 9/16-12 0.5495 0.5609 0.5016 0.5068 0.4587 12.80 12.84 (0.5625-12) 13.9573 14.2469 12.7406 12.8727 11.6510 5/8-11 0.6113 0.6234 0.5589 0.5644 0.5119 14.27 14.32 (0.625-11) 15.5270 15.8344 14.1961 14.3358 13.0023 3/4-10 0.7353 0.7482 0.6773 0.6832 0.6255 17.28 17.33
(0.750-10) 18.6766 19.0043 17.2034 17.3533 15.8877 7/8-9 0.8592 0.8731 0.7946 0.8009 0.7368 20.27 20.32 (0.875-9) 21.8237 22.1767 20.1828 20.3429 18.7147 1"-8 0.9830 0.9980 0.9100 0.9168 0.8446 23.22 23.27 (1.000-8) 24.9682 25.3492 23.1140 23.2867 21.4528
1. 螺胚直径指滚丝前的尺寸,数值为依经验公式计算而得,在实践中需验证。 2. 标记示例:10-24UNC-2A(或0.190-24UNC-2A) 、3/8-16UNC-2A(或0.375-16UNC-2A)
(注:表中上行斜体数值单位为英寸,下行为毫米)
2007-4-20 16:34
美制外螺纹(2A )常用规格极限尺寸表(细牙)
公称尺寸和每英寸牙数 螺纹系列代号 大径极限 中径极限 小径max 螺胚直径
最小 最大 最小 最大 最小 最大
8-36 UNF 0.1577 0.1632 0.1424 0.1452 0.1291 3.65 3.67
(0.164-36) 4.0056 4.1453 3.6170 3.6881 3.2791 10-32 0.1831 0.1891 0.1658 0.1688 0.1508 4.24 4.27 (0.190-32) 4.6507 4.8031 4.2113 4.2875 3.8303 12-28 0.2085 0.2150 0.1886 0.1918 0.1712 4.82 4.85 (0.216-28) 5.2959 5.4610 4.7904 4.8717 4.3485 1/4-28 0.2425 0.2490 0.2225 0.2258 0.2052 5.69 5.71
(0.250-28) 6.1595 6.3246 5.6515 5.7353 5.2121 5/16-24 0.3042 0.3114 0.2806 0.2843 0.2603 7.17 7.20
(0.3175-24) 7.7267 7.9096 7.1272 7.2212 6.6116 3/8-24 0.3667 0.3739 0.3430 0.3468 0.3228 8.75 8.78
(0.375-24) 9.3142 9.4971 8.7122 8.8087 8.1991 7/16-20 0.4281 0.4362 0.3995 0.4037 0.3749 10.19 10.23 (0.4375-20) 10.8737 11.0795 10.1473 10.2540 9.5225 1/2-20 0.4906 0.4987 0.4619 0.4662 0.4374 11.78 11.82 (0.50-20) 12.4612 12.6670 11.7323 11.8415 11.1100 9/16-18 0.5524 0.5611 0.5205 0.5250 0.4929 13.27 13.31 (0.5625-18) 14.0310 14.2519 13.2207 13.3350 12.5197 5/8-18 0.6149 0.6236 0.5828 0.5875 0.5554 14.85 14.89 (0.625-18) 15.6185 15.8394 14.8031 14.9225 14.1072 3/4-16 0.7391 0.7485 0.7029 0.7079 0.6718 17.91 17.95 (0.750-16) 18.7731 19.0119 17.8537 17.9807 17.0637 7/8-14 0.8631 0.8734 0.8216 0.8270 0.7858 20.93 20.97 (0.875-14) 21.9227 22.1844 20.8686 21.0058 19.9593 1"-12 0.9868 0.9982 0.9382 0.9441 0.8960 23.90 23.95 (1.000-12) 25.0647 25.3543 23.8303 23.9801 22.7584
1. 螺胚直径指滚丝前的尺寸,数值为依经验公式计算而得,在实践中需验证。 2. 标记示例:10-32UNF-2A(或0.190-32UNF-2A) 、3/8-24UNF-2A(或0.375-24UNF-2A)
美制外螺纹(2A )常用规格极限尺寸表(粗牙)
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美制螺纹尺寸对照表
螺纹规格-美制、英制、公制
公制/美制/英制螺纹对照表
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A 型美制螺纹(UNF )常用规格
外螺纹 内螺纹
-4 9/16"-19牙 14.28 13.08
-6 11/16''-16 17.46 16.1
-8 13/16''-16 20.64 19.28
-10 1''-14 25.40 23.57
-12 1(3/16)''-12 30.00 28.32
-16 1(7/16)''-12 36.51 34.67
-20 1(11/16)''-12 42.86 41.02
C 型JIC37度美制UNF 螺纹常用规格 -4 7/16”-20 11.11 10.03
-5 1/2”-20 12.70 11.32 -6 9/16”-18 14.28 13.08
-8 3/4”-16 19.00 17.68
-10 7/8”-14 22.22 20.68
-12 1(1/16)"-12 26.98 25.15
-16 1(5/16)"-12 33.33 31.5
-20 1(5/8)"-12 41.28 39.44
-24 1(7/8)"-12 47.62 45.8
-32 2(1/2)"-12 63.5 61.67
英制圆柱管螺纹(BSPP )常用规格 -4 1/4”-19 13.157 11.55
-6 3/8”-19 16.662 14.95
-8 1/2”-14 20.955 18.63
-12 3/4”-14 26.441 24.11
-16 1”-11 33.249 30.29
-20 1(1/4)''-11 41.91 38.95
英制圆锥管螺纹(BSPT )常用规格 基面大径 基准距离
1/4”-19 13.157 6
3/8”-19 16.662 6.4
1/2”-14 20.955 8.2
3/4”-14 26.441 9.5
1”-11 33.249 10.4
1(1/4)''-11 41.91 12.7
美制圆锥管螺纹(NPT )
1/8”-27 10.24 4 1/4”-18 13.60 4
3/8”-18 17.04 4.32
1/2”-14 21.22 4.48
3/4”-14 26.57 4.75
1”-11(1/2)” 33.22 4.6
1(1/4)”-11.5 41.96 4.83
4 5 6 7 8 9
3/4"-16 7/8"-14 11/16-12 15/16-12 15/8-12 17/8-12
19.012 22.184 26.944 33.294 41.229 47.579 63.452 6g 外螺纹大径 9.974 11.968 13.968 15.968 17.968 19.968 21.968 23.968 25.968 26.968 29.968 26.962 29.962 32.962 35.962 41.962 9.728 13.157 16.662 20.955 26.441 33.249 41.910 47.803
18.773 21.923 26.655 33.005 40.940 47.290 63.162 9.794 11.732 13.732 15.732 17.732 19.732 21.732 23.732 25.732 26.732 29.732 26.682 29.682 32.682 35.682 41.682 9.514 12.907 16.412 20.671 26.157 32.889 41.550 47.443
0.239 0.262 0.290 0.290 0.290 0.290 0.290 0.180 0.236 0.236 0.236 0.236 0.236 0.236 0.236 0.236 0.236 0.236 0.280 0.280 0.280 0.280 0.280 0.214 0.250 0.250 0.284 0.284 0.360 0.360 0.360
17.323 17.678 0.356 20.269 20.676 0.406 24.689 25.146 0.457 31.039 31.496 0.457 38.989 39.446 0.457 45.339 45.796 0.457 61.214 61.671 0.457 内螺纹小径
8.917 9.157 0.240 10.376 10.676 0.300 12.376 12.676 0.300 14.376 14.676 0.300 16.376 16.676 0.300 18.376 18.676 0.300 20.376 20.676 0.300 22.376 22.676 0.300 24.376 24.676 0.300 25.376 25.676 0.300 28.376 28.676 0.300 24.835 25.210 0.375 27.835 28.210 0.375 30.835 31.210 0.375 33.835 34.210 0.375 39.835 40.210 0.375
8.566 8.848 0.282 11.445 11.890 0.445 14.950 15.395 0.445 18.631 19.172 0.541 24.117 24.658 0.541 30.291 30.931 0.640 38.952 39.592 0.640 44.845 45.485 0.640
10 21/2-12 公制细牙 1 2 3 4 5 6 7 8 9
M10*1 M12*1.5 M14*1.5 M16*1.5 M18*1.5 M20*1.5 M22*1.5 M24*1.5 M26*1.5
10 M27*1.5 11 M30*1.5 12 M27*2 13 M30*2 14 M33*2 15 M36*2 16 M42*2 1 2 3 4 5 6 7 8
G1/8-28 G1/4-19 G3/8-19 G1/2-14 G3/4-14 G1-11 G11/4-11 G11/2-11
英制管螺纹