| 螺纹代号 | 基本尺寸 | 大径 mm d=D | 螺距 mm P | 每英寸牙数 tpi | 中径 mm d2=D2 | 小径 外螺纹 d3 | 牙型高度 H1 | 底孔尺寸 mm |
| G 1/8 | 1/8" | 9.728 | 0.907, | 28 | 9.147 | 8.566 | 0.581 | 8.7 |
| G 1/4 | 1/4" | 13.157 | 1.337 | 19 | 12.301 | 11.445 | 0.856 | 11.6 |
| G 3/8 | 3/8" | 16.662 | 1.337 | 19 | 15.806 | 14.95 | 0.856 | 15 |
| G 1/2 | 1/2" | 20.955 | 1.814 | 14 | 19.793 | 18.631 | 1.162 | 19 |
| G 5/8 | 5/8" | 22.911 | 1.814 | 14 | 21.749 | 20.587 | 1.162 | 20.75 |
| G 3/4 | 3/4" | 26.441 | 1.814 | 14 | 25.279 | 24.117 | 1.162 | 24.5 |
| G 7/8 | 7/81 ' | 30.201 | 1.814 | 14 | 29.039 | 27.877 | 1.162 | 28 |
| G 1 | 1" | 33.249 | 2.309 | 11 | 31.77 | 30.291 | 1.479 | 30.5 |
| G 1 1/8 | 1 1/8" | 37.7 | 2.309 | 11 | 36.418 | 34.939 | 1.479 | 35 |
| G 1 1/4 | 1 1/4 " | 41.91 | 2.309, | 11 | 40.431 | 38.952 | 1.479 | 39.5 |
| G 1 3/8 | 1 3/8 " | 44.323 | 2.309 | 11 | 42.844 | 41.365 | 1.479 | 41.5 |
| G 1 1/2 | 1 1/2" | 47.803 | 2.309 | 11 | 46.324 | 44.845 | 1.479 | 45 |
| G 1 3/4 | 1 3/4 " | 53.746 | 2.309 | 11 | 52.267 | 50.788 | 1.479 | 51 |
| G 2 | 2" | 59.614 | 2.309 | 11 | 58.135 | 56.656 | 1.479 | 57 |
| G 2 1/4 | 2 1/4 " | 65.71 | 2.309 | 11 | .231 | 62.752 | 1.479 | 63 |
| G 2 1/2 | 2 1/2" | 75.184 | 2.309 | 11 | 73.705 | 72.226 | 1.479 | 72.5 |
| G 2 3/4 | 2 3/4 " | 81.534 | 2.309 | 11 | 80.055 | 78.576 | 1.479 | 79 |
| G 3 | 3 " | 87.884 | 2.309 | 11 | 86.405 | 84.926 | 1.479 | 85.5 |
| G 3 1/4 | 3 1/4 " | 93.98 | 2.309, | 11 | 92.501 | 91.022 | 1.479 | 91 |
| G 3 1/2 | 3 1/2" | 100.33 | 2.309 | 11 | 98.351 | 97.372 | 1.479 | 97.75 |
| G 3 3/4 | 3 3/4 " | 106.68 | 2.309 | 11 | 105.201 | 103.722 | 1.479 | 104 |
| G 4 | 4" | 113.03 | 2.309 | 11 | 111.55 | 110.072 | 1.479 | 110.5 |
| G 4 1/2 | 4 1/2" | 125.73 | 2.309 | 11 | 124.251 | 122.772 | 1.479 | 123 |
| G 5 | 5 " | 138.43 | 2.309 | 11 | 136.951 | 135.472 | 1.479 | 136 |
| G 5 1/2 | 5 1/2" | 151.13 | 2.309 | 11 | 149.651 | 148.172 | 1.479 | 148.5 |
| G 6 | 6 " | 163.83 | 2.309, | 11 | 162.351 | 160.872 | 1.479 | 161.5 |
| 螺纹代号 | 基本尺寸 英寸 | 大径 mm d=D | 螺距 mm P | 每英寸牙数 tpi | 中径 mm d2=D2 | 小径 外螺纹 d3 | 牙型高度 H1 | 圆弧尺寸 r | 底孔尺寸 mm |
| R 1/16 | 1/16" | 7.723 | 0.907 | 28 | 7.142 | 6.561 | 0.581 | 0.125 | 6.4 |
| R 1/8 | 1/8" | 9.728 | 0.907 | 28 | 9.147 | 8.566 | 0.581 | 0.125 | 8.4 |
| R 1/4 | 1/4" | 13.157 | 1.337 | 19 | 12.301 | 11.445 | 0.856 | 0.184 | 11.2 |
| R 3/8 | 3/8" | 16.662 | 1.337 | 19 | 15.806 | 14.950 | 0.856 | 0.184 | 14.75 |
| R 1/2 | 1/2" | 20.955 | 1.814 | 14 | 19.793 | 18.631 | 1.162 | 0.249 | 18.25 |
| R 3/4 | 3/4" | 26.441 | 1.814 | 14 | 25.279 | 24.117 | 1.162 | 0.249 | 23.75 |
| R 1 | 1" | 33.249 | 2.309 | 11 | 31.77 | 30.291 | 1.479 | 0.317 | 30 |
| R 1 1/4 | 1 1/4" | 41.910 | 2.309 | 11 | 40.431 | 38.952 | 1.479 | 0.317 | 38.5 |
| R 1 1/2 | 1 1/2" | 47.803 | 2.309 | 11 | 46.324 | 44.845 | 1.479 | 0.317 | 44.5 |
| R 2 | 2" | 59.614 | 2.309 | 11 | 58.135 | 56.656 | 1.479 | 0.317 | 56 |
| R 2 1/2 | 2 1/2" | 75.184 | 2.309 | 11 | 73.705 | 72.226 | 1.479 | 0.317 | 71 |
| R 3 | 3" | 87.884 | 2.309 | 11 | 86.405 | 84.926 | 1.479 | 0.317 | 85.5 |
| R 4 | 4" | 113.030 | 2.309 | 11 | 111.551 | 10.072 | 1.479 | 0.317 | 110.5 |
| R 5 | 5" | 138.430 | 2.309 | 11 | 136.951 | 35.472 | 1.479 | 0.317 | 136 |
| R 6 | 6" | 163.830 | 2.309 | 11 | 162.351 | 60.872 | 1.479 | 0.317 | 161.5 |
| 号敌 n | 号M Cl | P | 财F 理高度H | 牙高 h | 廉淮大耳 D | 苯卿申种 | d | 备注 | |
| PTl/8 | 28 | 55* | fl, 9Q7 | 0. 871072 | a. 581 | 9.728 | 9J47 | 氏566 | 懺険1:低 |
| PSl/8 | 28 | 尙 | c. 9tr? | 0. 8T13GS | O.&B1 | 9.728 | 9. 147 | 农弹6 | 国崔熨 |
| hPTl/8 | 27 | 60' | a | 0.614705 | arse | 山⑵土 | 9.船9 | 8, 7J7 | 堆FJU:皿 |
| mA | 19 | 55* | 1. 317 | L 2$36«5 | 0.S56 | 13.1ST | 11 3D1 | 11.445 | |
| PS1/4 | 19 | 55* | 1. 3J7 | L 284025 | 0.&56 | 13.157 | 12. 301 | U.445 | |
| 18 | GT | L 411 | L 222058 | 1.129 | 1XC1B | 12. 487 | 11.358 | ||
| 宙 | 19 | 55* | 1. 337 | I. | 0.^6 | 1&虢 | 15. 80« | H.S50 | |
| 19 | 55' | 】* 337 | I 2S4025 | 0.856 | 1&«62 | 15. SOC | H.950 | 倔柱电 | |
| NH3/8 | IS | 时 | JH1E | L 22705& | L129 | 17.055 | 15. | 14”沏 | |
| PTl/2 | 14 | 矽 | L M | L 742H4 | Litt | 20.955 | ]9. 793 | 19.793 | |
| FSl/2 | 14 | 55* | LSJ4 | I 742603 | L162 | 20.95& | 19. 793 | 19.793 | | 册柱媲 |
| KFT1/2 | 14 | 60* | 1. BI4 | L 571217 | 1.4S1 | 21.224 | 19. 772 | 1S.321 | |
| PT3/4 | 14 | 矿 | 1 8H | L 74214f | 1J62 | 26.441 | 25. 27? | 24J17 | |
| PS3/4 | L4 | 55* | 1. BM | 1. | 1.162 | 26.441 | 25. 27$ | 24.117 | 岡竺 |
| M>T3/4 | U | 60" | L8J4 | I. 571217 | L451 | 2氐酣9 | 25. H7 | 甜品 | Ml: 16 |
| 寸号 尺代 | 牙数 n | 螺距 P | 牙型 离度 h | 基准平面内的基本直径 | 基准距离L】 1 | 装配余量L, | 外螺纹 小端面 内的基 本小径 | ||||
| 大径d=D | 中径山=口 | 小径df | |||||||||
| mm | 圏数 | nun | 圈数 | mm | mm | ||||||
| 1/16 | 27 | 0. 941 | 0. 752 | 7.4 | 7. 142 | 6. 3 | 4. 32 | 4. 0 | 3 | 2.822 | 6. 137 |
| 1/8 | 27 | 0. 941 | 0. 752 | 10.242 | 9. 4 | 8.737 | 4. 36 | 4. 102 | 3 | 2.822 | 8.481 |
| 1/4 | 18 | 1.411 | 1. 129 | 13.616 | 12.487 | 11.358 | 4. 10 | 5.785 | 3 | 4.233 | 10. 996 |
| 3々 | IX | 1.411 | 1. 129 | 17. 055 | 15. 926 | 14. 797 | 4. 32 | 6. 096 | 3 | 4. 233 | 14.417 |
| 1/2 | 14 | 1.814 | 1.451 | 21.224 | 19. 772 | 18. 321 | 4.48 | 8. 128 | 3 | 5.443 | 17.813 |
| 3/4 | 14 | 1.814 | 1.451 | 26. 569 | 25. 117 | 23.666 | 4.75 | 8.618 | 3 | 5.443 | 23. 127 |
| 1 | 11.5 | 2.209 | 1. 767 | 33. 228 | 31.461 | 29.694 | 4.60 | 10. 160 | 3 | 6.626 | 29. 060 |
| 17< | 11.5 | 2.209 | 1. 767 | 41.985 | 40. 218 | 38. 451 | 4.83 | 10.668 | 3 | 6. 350 | 37. 788 |
| 17, | 11.5 | 2.209 | 1.767 | 48. 054 | 46. 2S7 | 44. 520 | 4.83 | 10. 668 | 3 | 6. 350 | 43. 853 |
| 2 | 11.5 | 2.209 | 1.767 | 60. 092 | 58. 325 | 56, 558 | 5.01 | 11.065 | 3 | 6. 350 | 55.867 |
| 27, | 8 | 3. 175 | 2.540 | 72.699 | 70. 159 | 67. 619 | 5.46 | 17. 335 | 2 | 6. 350 | 66.535 |
| 3 | 8 | 3. 175 | 2. 540 | 88.608 | 86. 068 | 8 3. 528 | 6. 13 | 19.463 | 2 | 6. 350 | 62. 311 |
| 37, | 8 | 3.175 | 2.540 | 101. 316 | 98. 776 | 96.236 | 6.57 | 20. 860 | 2 | 6. 350 | 94.932 |
| 4 | 8 | 3.175 | 2.540 | 113.973 | 111.433 | 108. 3 | 6.75 | 21.431 | 2 | 6. 350 | 107. 554 |
| £ | 8 | 3. 175 | 2.540 | 140. 952 | 138.412 | 135.872 | 7.50 | 23.812 | 2 | 6. 350 | 134. 384 |
| 6 | 8 | 3. 175 | 2.540 | 167. 792 | 165.252 | 162.712 | 7.66 | 24.320 | 2 | 6. 350 | 161. 191 |
| 8 | 8 | 3・ 175 | 2.540 | 218. 441 | 215.901 | 213. 361 | 8. 50 | 26.988 | 2 | 6. 350 | 211.673 |
| 10 | 8 | 3. 175 | 2.540 | 272. 312 | 269.772 | 267. 232 | 9.68 | 30. 734 | 2 | 6. 350 | 265. 311 |
| 12 | 8 | 3. 175 | 2.540 | 323. 032 | 320.492 | 317.952 | 10.88 | 34.544 | 2 | 6. 350 | 315.793 |
| 140. D. | 8 | 3. 175 | 2.540 | 354. 904 | 352. 3 | 349.824 | 12.50 | 39.688 | 2 | 6. 350 | 347.345 |
| 160. D. | 8 | 3. 175 | 2.540 | 405. 784 | 403. 244 | 400. 704 | 14.50 | 46. 038 | 2 | 6. 350 | 397.828 |
| 180.D. | 8 | 3.175 | 2.540 | 456. 565 | 454. 025 | 451.485 | 16.00 | 50. 800 | 2 | 6. 350 | 44& 310 |
| 200. D. | 8 | 3.175 | 2.540 | 507. 246 | 504.706 | 502.166 | 17. 00 | 53. 975 | 2 | 6. 350 | 498.792 |
| 240. D. | 8 | 3. 175 | 2.540 | 60& 608 | 606.068 | 603.528 | 19. 00 | 60. 325 | 2 | 6. 350 | 599. 758 |
2螺纹收尾长度(V)为3. 47 P;
30.D•是英文管子外径(outside diameter)的缩写•
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/W16 | 17.46 | 16. 1 |
| _8 | 13/16八-】6 | 20. | 19. 28 |
| -10 | 1 八一 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 (ll/16)z,-12 | 42. 86 | 41.02 |
| C型JIC37度美制UNF缥纹常用规格 | |||
| —4 | 7/16力-20 | 11. 11 | 10. 03 |
| -5 | 1/2” -20 | 12. 70 | 11. 32 |
| 一6 | 9/16” -18 | 14. 28 | 13. 08 |
| I -8 | 3/4" -16 | 19. 00 | 17. 68 |
| -10 | 7/旷-14 | 22. 22 | 20. 68 |
| 1 -12 | 1(1/16) T2 | 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) —2 | 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 | ]” -11 | 33. 249 | 30.29 |
| -20 | 41. 91 | 38.95 | |
| 美制圆锥管螺纹(NPT) | |||
| 1® -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 | |