Standard Mil-T-27 Cases Dimensions

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Standard Mil-T-27 Cases Dimensions

Case Symbol	Case Dimensions			Military Dimensions
Case Symbol	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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Standard Mil-T-27 Cases Dimensions