Threads / Series directory
UNEF
thread sizes.
18 distinct nominal diameter–pitch combinations. Open a size for its differences and exact next steps.
Choose the complete designation
0 of 18 sizes have a matching reviewed drill-chart row. The cited chart covers UNC/UNF and metric equations; UNEF drill selections are not supplied.
Swipe to see all columns →
| Designation | Major Ø · in / mm | TPI | Pitch · mm | Drill evidence | Next step |
|---|---|---|---|---|---|
| 1/4-32 UNEF | 0.25 / 6.35 | 32 | 0.79375 | Maker data needed | Tap-drill lookup → |
| 5/16-32 UNEF | 0.3125 / 7.9375 | 32 | 0.79375 | Maker data needed | Tap-drill lookup → |
| 3/8-32 UNEF | 0.375 / 9.525 | 32 | 0.79375 | Maker data needed | Tap-drill lookup → |
| 7/16-28 UNEF | 0.4375 / 11.1125 | 28 | 0.907143 | Maker data needed | Tap-drill lookup → |
| 1/2-28 UNEF | 0.5 / 12.7 | 28 | 0.907143 | Maker data needed | Tap-drill lookup → |
| 9/16-24 UNEF | 0.5625 / 14.2875 | 24 | 1.058333 | Maker data needed | Tap-drill lookup → |
| 5/8-24 UNEF | 0.625 / 15.875 | 24 | 1.058333 | Maker data needed | Tap-drill lookup → |
| 11/16-24 UNEF | 0.6875 / 17.4625 | 24 | 1.058333 | Maker data needed | Tap-drill lookup → |
| 3/4-20 UNEF | 0.75 / 19.05 | 20 | 1.27 | Maker data needed | Tap-drill lookup → |
| 13/16-20 UNEF | 0.8125 / 20.6375 | 20 | 1.27 | Maker data needed | Tap-drill lookup → |
| 7/8-20 UNEF | 0.875 / 22.225 | 20 | 1.27 | Maker data needed | Tap-drill lookup → |
| 1-20 UNEF | 1 / 25.4 | 20 | 1.27 | Maker data needed | Tap-drill lookup → |
| 1 1/16-18 UNEF | 1.0625 / 26.9875 | 18 | 1.411111 | Maker data needed | Tap-drill lookup → |
| 1 1/8-18 UNEF | 1.125 / 28.575 | 18 | 1.411111 | Maker data needed | Tap-drill lookup → |
| 1 3/16-18 UNEF | 1.1875 / 30.1625 | 18 | 1.411111 | Maker data needed | Tap-drill lookup → |
| 1 1/4-18 UNEF | 1.25 / 31.75 | 18 | 1.411111 | Maker data needed | Tap-drill lookup → |
| 1 3/8-18 UNEF | 1.375 / 34.925 | 18 | 1.411111 | Maker data needed | Tap-drill lookup → |
| 1 1/2-18 UNEF | 1.5 / 38.1 | 18 | 1.411111 | Maker data needed | Tap-drill lookup → |
Before treating a size as a match
Confirm pitch, thread profile and complete drawing requirements. A nominal diameter match does not establish mating compatibility.
Read the designation and class →