AN101101-AN101200 at a glance
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Specification
| Item | Value |
|---|---|
| Type | Hexagon head bolt |
| Material | Steel AMS6322, hardness Rockwell C26-32; manufacturing specification AMS7452 |
| Finish | Cadmium plate AMS2400 |
| Status | Check the current issue before design use. Inactive for new design after 3 Mar 1969; no superseding standard. |
Dimensions by size
| Dimension, in | .250-28 UNF-3A |
|---|---|
| Thread | .250-28 UNF-3A |
| A max — A dia (shank), max | .249 |
| A min — A dia (shank), min | .246 |
| B max — B, max (across flats) | .439 |
| B min — B, min (across flats) | .430 |
| C — C, min (across corners) | .491 |
| D — D (head height) | .156 |
| W — W dia (bearing face, head chamfer 30°) | .438 |
| E — E × 45°, approx (end chamfer) | .031 |
Dimensions in inches, from the drawing of the standard. L and K are the standard's letters; A, B, C, D, E and W are assigned on this datasheet.
Part numbers
Part numbers by length L, with length to full thread K. The standard governs.
.250-28 UNF-3A55 part numbers
| Part no. | L, in | K to full thread, in |
|---|---|---|
| AN101106 | .500 | — |
| AN101107 | .562 | — |
| AN101108 | .625 | — |
| AN101109 | .688 | — |
| AN101110 | .750 | .125 |
| AN101111 | .812 | .188 |
| AN101112 | .875 | .250 |
| AN101113 | .938 | .312 |
| AN101114 | 1.000 | .375 |
| AN101115 | 1.062 | .438 |
| AN101116 | 1.125 | .500 |
| AN101117 | 1.188 | .562 |
| AN101118 | 1.250 | .625 |
| AN101119 | 1.312 | .688 |
| AN101120 | 1.375 | .750 |
| AN101121 | 1.438 | .812 |
| AN101122 | 1.500 | .875 |
| AN101123 | 1.562 | .938 |
| AN101124 | 1.625 | 1.000 |
| AN101125 | 1.688 | 1.062 |
| AN101126 | 1.750 | 1.125 |
| AN101127 | 1.875 | 1.250 |
| AN101128 | 2.000 | 1.375 |
| AN101129 | 2.125 | 1.500 |
| AN101130 | 2.250 | 1.625 |
| AN101131 | 2.375 | 1.750 |
| AN101132 | 2.500 | 1.875 |
| AN101133 | 2.625 | 2.000 |
| AN101134 | 2.750 | 2.125 |
| AN101135 | 2.875 | 2.250 |
| AN101136 | 3.000 | 2.375 |
| AN101137 | 3.125 | 2.500 |
| AN101138 | 3.250 | 2.625 |
| AN101139 | 3.375 | 2.750 |
| AN101140 | 3.500 | 2.875 |
| AN101141 | 3.625 | 3.000 |
| AN101142 | 3.750 | 3.125 |
| AN101143 | 3.875 | 3.250 |
| AN101144 | 4.000 | 3.375 |
| AN101145 | 4.125 | 3.500 |
| AN101146 | 4.250 | 3.625 |
| AN101147 | 4.375 | 3.750 |
| AN101148 | 4.500 | 3.875 |
| AN101149 | 4.625 | 4.000 |
| AN101150 | 4.750 | 4.125 |
| AN101151 | 4.875 | 4.250 |
| AN101152 | 5.000 | 4.375 |
| AN101153 | 5.125 | 4.500 |
| AN101154 | 5.250 | 4.625 |
| AN101155 | 5.375 | 4.750 |
| AN101156 | 5.500 | 4.875 |
| AN101157 | 5.625 | 5.000 |
| AN101158 | 5.750 | 5.125 |
| AN101159 | 5.875 | 5.250 |
| AN101160 | 6.000 | 5.375 |
Part number
What each code means
| Part | Meaning |
|---|---|
| Format | AN101<dash> |
| Example | AN101160 — Hex head bolt, .250-28 UNF-3A, L 6.000, K 5.375 |
Notes from the standard
- Each part number is one length L; K is the length to full thread (+.000 −.060). Where K shows a dash, the thread runs to the head with two imperfect threads max. Do not use unassigned part numbers.
- Shank straight within .003 FIR per inch of bolt length; thread pitch diameter concentric with the shank within .006 FIR; shank concentric with the washer face diameter and hexagon within .013 FIR.
- Bearing face square with the shank within .003 FIR; head chamfer 30° to the bearing face diameter (opposite side optional); fillet under the head R .005 to .015; max 2 imperfect threads.
- Thread per MIL-S-7742. Material identification per AMS2800, raised or depressed .010 max.
- All parts undergo magnetic inspection per AMS2640. Break sharp edges .003 to .015 unless otherwise specified. Unless otherwise specified: linear ±.010, angular ±2°.
- Approved data governs. Use the bolt the SRM, drawing or IPC calls for.
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Sources
- AN101101 thru AN101200 Rev. 3, 30 Jun 1986 — Bolt — Hex Head, .250-28 — 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.