Thread Oversizing Allowances
| Nominal Nut Size, in. and Pitch | Diametral Allowance, in. | Nominal Nut Size, in. and Pitch | Diametral Allowance, in. | Nominal Nut Size, in. and Pitch | Diametral Allowance, in. | ||
|---|---|---|---|---|---|---|---|
| 1/4-20 | 0.016 | 1-1/8-8 | 0.024 | 2-4-1/2 | 0.050 | ||
| 5/16-18 | 0.017 | 1-1/8-7 | 0.024 | 2-1/4-4-1/2 | 0.050 | ||
| 3/8-16 | 0.017 | 1-1/4-8 | 0.024 | 2-1/2-4 | 0.050 | ||
| 7/16-14 | 0.018 | 1-1/4-7 | 0.024 | 2-3/4-4 | 0.050 | ||
| 1/2-13 | 0.018 | 1-3/8-8 | 0.027 | 3-4 | 0.050 | ||
| 9/16-12 | 0.020 | 1-3/8-6 | 0.027 | 3-1/4-4 | 0.050 | ||
| 5/8-11 | 0.020 | 1-1/2-8 | 0.027 | 3-1/2-4 | 0.050 | ||
| 3/4-10 | 0.020 | 1-1/2-6 | 0.027 | 3-3/4-4 | 0.050 | ||
| 7/8-9 | 0.022 | 1-3/4-5 | 0.050 | 4-4 | 0.050 | ||
| 1-8 | 0.024 | ||||||
| Table 5 of ASTM A563: Thread Dimensions and Overtapping Allowances for Nuts Hot Dipped Galvanized per Specification F2329 | |||||||