MIL-DTL-24558B
3.4.4.1 Mounting brackets. Unless otherwise specified (see 6.2), the terminal board
Mounting bracket and pad installation shall be as specified in the applicable specification sheet.
3.4.4.2 Alternate mounting bracket. If specified (see 6.2), an alternate type terminal
board mounting bracket that utilizes stainless steel press-fit type fasteners with self-locking clinch
nuts in accordance with NASM45938 may be used in place of the typical brass barrel nuts that are
typically brazed into the bracket.
3.4.5 Threaded parts. Threads for all threaded fastening devices shall conform to
FED-STD-H28 and FED-STD-H28/2. The threads shall be right hand, coarse thread series,
unified thread form, class 2A or 2B, or American National thread form, class 2. Other thread
series and classes, such as fine thread, may be used where it is necessary to assure functional
operation of the equipment. Threads shall be checked during production with go-no go gages to
insure conformance to FED-STD-H28 and FED-STD-H28/2.
3.4.6 Gaskets. Cover sealing gaskets shall be furnished and installed in accordance with
MIL-E-24142.
3.4.7 Brazing and welding. Brazing and welding shall be in accordance with best
commercial practices and performed in a manner that will pass all required tests. Gas tungsten
arc welding is an acceptable alternate to brazing.
3.4.8 Dimensions and tolerances. Dimensions shall be as shown in the applicable
specification sheet. Unless otherwise specified in the applicable specification sheet, the following
tolerances shall apply:
a. Decimal dimensions - ±0.016 inch.
b. Angular dimensions - ±0.25 degree.
Unless otherwise specified in the applicable specification sheet, a tolerance of ±0.031 inch is
acceptable on decimal dimensions that are controlled by brazing or welding provided that this
wider tolerance will not interfere with the interchangeability of assemblies or parts.
3.4.9 Drilling, countersinking, and tapping. All drilling, countersinking, and tapping
shall be completed before plating or finish is applied. Tapped holes that are used for normal
replacement of parts shall be countersunk.
3.4.10 Sharp edges. All sharp edges and corners shall be given a slight radius.
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