惠氏螺纹是英国英寸制规格紧固件用普通螺纹，其牙型角为55°，习惯用公称直径（单位为英寸inch）及每英寸牙数来表示，尺寸单位采用符号“ ” ”。例如：1/2”-12BSW表示公称直径为1/2”的粗牙惠氏螺纹。
统一标准螺纹是美国英寸制规格紧固件用普通螺纹，其牙型角为60°，一般用号码（公称直径﹤1/4”）或公称直径的英寸分数（≥1/4”）、每英寸牙数和代号（UNC、UNF）来表示。例如：1/2”-13UNC表示公称直径为1/2”的粗牙统一标准螺纹。
惠氏螺纹和统一标准螺纹公称直径与每英寸牙数
| 螺纹大径 | 统一标准螺纹ANSI B1.1-182 | 惠氏螺纹BS84-1956 | ||||
| inch | 尺寸代号 | 粗牙UNC | 细牙UNF | 尺寸代号 | 粗牙BSW | 细牙BSF |
| 0.0600 | 0# | 80 | ||||
| 0.0625 | 1/16 | 60 | ||||
| 0.0730 | 1# | 72 | ||||
| 0.0860 | 2# | 56 | ||||
| 0.0938 | 3/32 | 48 | ||||
| 0.0990 | 3# | 48 | 56 | |||
| 0.1120 | 4# | 40 | 48 | |||
| 0.1250 | 5# | 40 | 44 | 1/8 | 40 | |
| 0.1380 | 6# | 32 | 40 | |||
| 0.1563 | 5/32 | 32 | ||||
| 0.10 | 8# | 32 | 36 | |||
| 0.1875 | 3/16 | 24 | 32 | |||
| 0.1900 | 10# | 24 | 32 | |||
| 0.2160 | 12# | 24 | 28 | |||
| 0.21 | 7/32 | 24 | 28 | |||
| 0.2500 | 1/4 | 20 | 28 | 1/4 | 20 | 26 |
| 0.2812 | 9/32 | 26 | ||||
| 0.3125 | 5/16 | 18 | 24 | 5/16 | 18 | 22 |
| 0.3750 | 3/8 | 16 | 24 | 3/8 | 16 | 20 |
| 0.4375 | 7/16 | 14 | 20 | 7/16 | 14 | 18 |
| 0.5000 | 1/2 | 13 | 20 | 1/2 | 12 | 16 |
| 0.5625 | 9/16 | 12 | 18 | 9/16 | 12 | 16 |
| 0.6250 | 5/8 | 11 | 18 | 5/8 | 11 | 14 |
| 0.6875 | 11/16 | 11 | 14 | |||
| 0.7500 | 3/4 | 10 | 16 | 3/4 | 10 | 12 |
| 0.8125 | 13/16 | 12 | ||||
| 0.8750 | 7/8 | 9 | 14 | 7/8 | 9 | 11 |
| 1.0000 | 1 | 8 | 12 | 1 | 8 | 10 |
| 1.1250 | 1-1/8 | 7 | 12 | 1-1/8 | 7 | 9 |
| 1.2500 | 1-1/4 | 7 | 12 | 1-1/4 | 7 | 9 |
| 1.3750 | 1-3/8 | 6 | 12 | 1-3/8 | 8 | |
| 1.5000 | 1-1/2 | 6 | 12 | 1-1/2 | 6 | 8 |
| 1.6250 | 1-5/8 | 1-5/8 | 8 | |||
| 1.7500 | 1-3/4 | 5 | 1-3/4 | 5 | 7 | |
| 2.0000 | 2 | 4.5 | 2 | 4.5 | 7 | |
| 2.2500 | 2-1/4 | 4.5 | ||||
| 2.5000 | 2-1/2 | 4 | ||||
| 2.7500 | 2-3/4 | 4 | ||||
| 3.0000 | 3 | 4 | ||||
| 3.2500 | 3-1/4 | 4 | ||||
| 3.5000 | 3-1/2 | 4 | ||||
| 3.7500 | 3-3/4 | 4 | ||||
| 4.0000 | 4 | 4 | ||||
| 备注：各种英、美制螺纹代号说明 | ||||||
| BA-British Association | ||||||
| BSW-British Standard Whitworth | ||||||
| BSF-British Standard Fine | ||||||
| BSP-British Standard Pipe | ||||||
| BSPT-British Standard Pipe Tapered | ||||||
| BSC-British Standard Cycle | ||||||
| UNC-Unified National Course | ||||||
| UNF-Unified National Fine | ||||||
| UNEF-Unified National Extra Fine | ||||||
| UNM-Unified National Miniature | ||||||
| NPT-National Pipe Tapered | ||||||
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