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Standard Mil-T-27 Cases Dimensions
| Case Symbol | Case Dimensions | Military Dimensions | ||||
|---|---|---|---|---|---|---|
| L | W | H | ML | MW | F | |
| AF | 3/4 | 3/4 | 1 1/8 | 13/16 * | — | 4/40 x 3/8 |
| AG | 1 | 1 | 1 3/8 | 1 1/8 * | — | 6 – 32 x 3/8 |
| AH | 1 5/16 | 1 5/16 | 1 3/4 | S:1 1/4 | — | 6 – 32 x 3/8 |
| AJ | 1 5/8 | 1 5/8 | 2 3/8 | 1 1/16 | 1 3/16 | 6 – 32 x 3/8 |
| EA | 1 15/16 | 1 11/16 | 2 1/4 | 1 3/8 | 1 1/4 | 6 – 32 x 3/8 |
| EB | 1 13/16 | 1 13/16 | 2 1/16 | 1 3/8 | 1 1/4 | 6 – 32 x 3/8 |
| FA | 2 3/16 | 2 1/16 | 3 1/8 | 1 11/16 | 1 7/16 | 6 – 32 x 3/8 |
| FB | 2 5/16 | 2 1/16 | 2 1/2 | 1 11/16 | 1 7/16 | 6 – 32 x 3/8 |
| GA | 2 3/4 | 2 3/8 | 3 13/16 | 2 1/8 | 1 3/4 | 6 – 32 x 3/8 |
| GB | 2 3/4 | 2 3/8 | 2 13/16 | 2 1/8 | 1 3/4 | 6 – 32 x 3/8 |
| HA | 3 1/16 | 2 5/8 | 4 1/4 | 2 19/64 | 1 35/64 | 6 – 32 x 3/8 |
| HB | 3 1/16 | 2 5/8 | 3 3/16 | 2 19/64 | 1 35/64 | 8 – 32 x 3/8 |
| JA | 3 9/16 | 3 1/16 | 4 7/8 | 2 5/8 | 2 1/8 | 8 – 32 x 3/8 |
| JB | 3 9/16 | 3 1/16 | 3 7/8 | 2 3/8 | 2 1/8 | 8 – 32 x 3/8 |
| KA | 3 15/16 | 3 3/8 | 5 1/4 | 3 | 2 1/16 | 10 – 32 x 1/2 |
| KB | 3 15/16 | 3 3/18 | 4 5/16 | 3 | 2 1/16 | 10 – 32 x 1/2 |
| LA | 4 3/16 | 3 11/16 | 5 9/16 | 3 5/16 | 2 11/16 | 10 – 32 x 1/2 |
| LB | 4 3/16 | 3 11/16 | 4 1/2 | 3 3/16 | 2 11/16 | 10 – 32 x 1/2 |
| MA | 4 11/16 | 4 | 6 | 3 11/16 | 3 | 1/4 – 20 x 5/8 |
| MB | 4 11/16 | 4 | 4 15/16 | 3 11/16 | 3 | 1/4 – 20 x 5/8 |
| NA | 5 1/16 | 4 5/16 | 6 13/16 | 4 1/16 | 3 1/16 | 1/4 – 20 x 5/8 |
| NB | 5 1/16 | 4 5/16 | 5 1/2 | 4 1/16 | 3 5/16 | 1/4 – 20 x 5/8 |
| OA | 5 1/2 | 4 1/2 | 6 3/4 | 3 3/4 | 3 | 1/4 – 20 x 5/8 |
| * Not in conformance with MIL-T-27 | S: Two studs in a diagonal. |
| YY | All metal cases not included above or with non-standard mounting canters. |
| ZZ | Open type and encapsulated units. |
| 1. | Tolerances on dimensions L and W are +0 to -1/16 for cases AF, AG, AH and AJ; +0 to -1/8 for all other cases. |
| 2. | Tolerances on dimension H are +0 to – 1/8 for cases AF, AG, AH, and AJ; +0 to -3/16 for all other cases. |
| 3. | Tolerances on dimensions ML and MW are ±1/16 for cases AJ to JB inclusive: ±1/32 for cases KA to LB, inclusive; and ±3/64 for cases MA to CA, inclusive. When mounting studs or holes for inserts are used, they shall be symmetrically locked. |
| 4. | Screw-stud lengths are from mounting surface and have a length tolerance of ±1/16 on studs 1/2″ long or less and ±1/8 on studs over 1/2″ long. |
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