AN12 at a glance
Where to buy
Specification
| Item | Value |
|---|---|
| Type | Hexagon head machine bolt |
| Material | Non-corrosion-resistant steel, corrosion-resistant steel or aluminum alloy; finish per the procurement specification |
| Status | Check the current issue before design use. Cancelled by Notice 1 (Dec 1999) and superseded by NASM3 thru NASM20; the notice states the part numbers are identical. |
Dimensions by size
| Dimension, in | 3/4-16 UNF-3A |
|---|---|
| Thread | 3/4-16 UNF-3A |
| A max — A dia, max | .749 |
| A min — A dia, min | .744 |
| B max — B, max (across flats) | 1.066 |
| B min — B, min (across flats) | 1.053 |
| C — C, ref (across corners) | 1.230 |
| D max — D, max (head height) | .422 |
| D min — D, min (head height) | .390 |
| H — H dia, min | 1.023 |
| J — J drill (shank hole), +.010 −.000 | .141 |
| K — K drill (head hole), +.010 −.000 | .070 |
Dimensions in inches, as tabulated in the standard (letters as on its drawing).
Part numbers
Part numbers by dash number, with grip and length. The standard governs.
3/4-16 UNF-3A57 part numbers
| Part no. | Grip, in | Length, in |
|---|---|---|
| AN12-10 | 1/16 | 1-5/32 |
| AN12-11 | 3/16 | 1-9/32 |
| AN12-12 | 5/16 | 1-13/32 |
| AN12-13 | 7/16 | 1-17/32 |
| AN12-14 | 9/16 | 1-21/32 |
| AN12-15 | 11/16 | 1-25/32 |
| AN12-16 | 13/16 | 1-29/32 |
| AN12-17 | 15/16 | 2-1/32 |
| AN12-20 | 1-1/16 | 2-5/32 |
| AN12-21 | 1-3/16 | 2-9/32 |
| AN12-22 | 1-5/16 | 2-13/32 |
| AN12-23 | 1-7/16 | 2-17/32 |
| AN12-24 | 1-9/16 | 2-21/32 |
| AN12-25 | 1-11/16 | 2-25/32 |
| AN12-26 | 1-13/16 | 2-29/32 |
| AN12-27 | 1-15/16 | 3-1/32 |
| AN12-30 | 2-1/16 | 3-5/32 |
| AN12-31 | 2-3/16 | 3-9/32 |
| AN12-32 | 2-5/16 | 3-13/32 |
| AN12-33 | 2-7/16 | 3-17/32 |
| AN12-34 | 2-9/16 | 3-21/32 |
| AN12-35 | 2-11/16 | 3-25/32 |
| AN12-36 | 2-13/16 | 3-29/32 |
| AN12-37 | 2-15/16 | 4-1/32 |
| AN12-40 | 3-1/16 | 4-5/32 |
| AN12-41 | 3-3/16 | 4-9/32 |
| AN12-42 | 3-5/16 | 4-13/32 |
| AN12-43 | 3-7/16 | 4-17/32 |
| AN12-44 | 3-9/16 | 4-21/32 |
| AN12-45 | 3-11/16 | 4-25/32 |
| AN12-46 | 3-13/16 | 4-29/32 |
| AN12-47 | 3-15/16 | 5-1/32 |
| AN12-50 | 4-1/16 | 5-5/32 |
| AN12-51 | 4-3/16 | 5-9/32 |
| AN12-52 | 4-5/16 | 5-13/32 |
| AN12-53 | 4-7/16 | 5-17/32 |
| AN12-54 | 4-9/16 | 5-21/32 |
| AN12-55 | 4-11/16 | 5-25/32 |
| AN12-56 | 4-13/16 | 5-29/32 |
| AN12-57 | 4-15/16 | 6-1/32 |
| AN12-60 | 5-1/16 | 6-5/32 |
| AN12-61 | 5-3/16 | 6-9/32 |
| AN12-62 | 5-5/16 | 6-13/32 |
| AN12-63 | 5-7/16 | 6-17/32 |
| AN12-64 | 5-9/16 | 6-21/32 |
| AN12-65 | 5-11/16 | 6-25/32 |
| AN12-66 | 5-13/16 | 6-29/32 |
| AN12-67 | 5-15/16 | 7-1/32 |
| AN12-70 | 6-1/16 | 7-5/32 |
| AN12-71 | 6-3/16 | 7-9/32 |
| AN12-72 | 6-5/16 | 7-13/32 |
| AN12-73 | 6-7/16 | 7-17/32 |
| AN12-74 | 6-9/16 | 7-21/32 |
| AN12-75 | 6-11/16 | 7-25/32 |
| AN12-76 | 6-13/16 | 7-29/32 |
| AN12-77 | 6-15/16 | 8-1/32 |
| AN12-80 | 7-1/16 | 8-5/32 |
Part number
What each code means
| Part | Meaning |
|---|---|
| Format | AN12-<dash> |
| Example | AN12-10 — Non-corrosion-resistant steel bolt, 3/4 in, grip 1/16, length 1-5/32, drilled shank only |
Notes from the standard
- Dash number sets the length and grip. Add C before the dash number for a corrosion-resistant steel bolt and DD for an aluminum alloy bolt; A after the dash number for an undrilled bolt; H before the dash number for a drilled head and shank; H before and A after for a drilled head only.
- Examples: AN12-10 is the non-corrosion-resistant steel bolt with a drilled shank only; AN12C10 is the corrosion-resistant steel bolt; AN12-10A is undrilled.
- Grip tolerance ±1/64 in; length tolerance +1/32 −1/64 in. Grip is measured from the underside of the head to the end of the full cylindrical portion of the shank; complete threads begin within two thread pitches at most.
- Part number format as commonly written; check the standard for the exact format.
- Approved data governs. Use the bolt the SRM, drawing or IPC calls for.
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Sources
- AN3 thru AN20 Rev. 12, 14 Jan 1991 — Bolt — Machine, Aircraft — dimensions, part numbers and notes. Public domain, distribution unlimited.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.