SchraubennormenAmerikanische Schrauben (UNC und UNF) haben einen Flankenwinkel von 60º, wie metrische Schrauben, haben aber andere Durchmesser.
Zollschrauben sind somit nicht mit der metrischen Norm kompatibel.
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| Gewindedurchmesser in Inch | Gewindedurchmesser in mm | Schlüsselweite in Inch | Schlüsselweite in mm |
| 1/4" | 6,350 | 7/16" | 11,113 |
| 5/16" | 7,938 | 1/2" | 12,700 |
| 3/8" | 9,525 | 9/16" | 14,288 |
| 7/16" | 11,113 | 5/8" | 15,875 |
| 1/2" | 12,700 | 3/4" | 19,050 |
| 5/8" | 15,875 | 15/16" | 23,813 |
| 3/4" | 19,050 | 1 1/8" | 28,575 |
| 7/8" | 22,225 | 1 5/16" | 33,338 |
| 1" | 25,400 | 1 1/2" | 38,100 |
| 1 1/8" | 28,575 | 1 11/16" | 42,863 |
| 1 1/4" | 31,750 | 1 7/8" | 47,625 |
| 1 3/8" | 34,925 | 2 1/16" | 52,388 |
| 1 1/2" | 38,100 | 2 1/4" | 57,150 |
| 1 3/4" | 44,450 | 2 5/8" | 66,675 |
| 2" | 50,800 | 3" | 76,200 |
| 2 1/4" | 57,150 | 3 3/8" | 85,725 |
| 2 1/2" | 63,500 | 3 3/4" | 95,250 |
| 2 3/4" | 69,850 | 4 1/8" | 104,775 |
| 3" | 76,200 | 4 1/2" | 114,300 |
| 3 1/4" | 82,550 | 4 7/8" | 123,825 |
| 3 1/2" | 88,900 | 5 1/4" | 133,350 |
| 3 3/4" | 95,250 | 5 5/8" | 142,875 |
| 4" | 101,600 | 6" | 152,400 |
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