MIL-F-18327 Filters; High Pass, Low Pass, Band Pass, Band Suppression, And Dual Functioning, General Specification ForThis specification covers the general requirements for passive frequency-selective networks, such as dual functioning, band suppression, band pass, low pass, and high pass \(or any combination thereof\) electric-wave filters, including those employing electromechanical and piezoelectric elements, for use over the frequency range of 0 to 500 megahertz. Filters covered by this specification are intended for use where operation under various environmental conditions is required. This specification covers filters weighing not more than 50 pounds and requiring root-mean-square test voltage ratings not greater than 5,000 volts.

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MIL-F-18327F

NOTES:

1. Cases AF through OA inclusive have studs and terminals on same face. Stud size and length are as shown

in dimension F.

2. Dimensions are in inches.

3. Metric equivalents are given for general information only.

4. Tolerances on dimensions A and B are +.000, -.062 (+0.00, -1.57 mm) for cases AF, AG, AH, and AJ;

+.000, -.125 (+0.00 -3.18 mm) for all other cases.

5. Tolerances on dimensions C are +.000, -.125 (+0.00, -3.18 mm) for cases AF, AG, AH, and AJ;

+.000, - .185 (+0.00, -4.78 mm) for all other cases.

6. Tolerances on dimensions D and E are � .016 (0.41 mm) for cases AJ to JB inclusive; � .031 (0.79 mm) for

cases KA to LB inclusive; and � .047 (1.19 mm) for cases MA to OA inclusive. The centerlines of the

drawings are the centerlines of the case; D/2 and E/2 are the reference dimensions.

7. Tolerances for cases YY and ZZ are as follows: Dimensions not exceeding those for the AJ case have the

same tolerances as the AJ cases. For larger dimensions up to case size OA, the tolerances in notes 4, 5,

and 6 apply. For case sizes larger than OA, tolerances are as specified. Dimensions A, B, and C for ZZ

cases are considered maximum dimensions (see 3.1).

8. Tolerances on dimension S for two-stud mounting are � .016 (0.41 mm) for cases AF to AH inclusive. For

four-stud mounting, the difference between the two diagonal S dimensions should not exceed 1.5 times the

tolerance specified for dimensions D and E in note 6.

9. Screw-stud lengths are measured from the mounting surface and have a length tolerance of � .062 (1.57 mm)

on studs .500 (12.70 mm) long or less, and � .125 (3.18 mm) on studs over .500 (12.70 mm) long. Mounting

screw inserts may be supplied instead of studs for case sizes AF, AG, and AH, or units of equivalent volume

and have a minimum depth equivalent to eight full threads (grades 4, 6, and 8 only) of the same diameter as the

stud of the corresponding case size. Inserts meet all stud requirements.

10. Rectangular cases may have corner radii not to exceed one-quarter of the smallest envelope dimensions.

11. When mounted, tilt of units (overhand only) measured horizontally or vertically, may not exceed .016 (0.41 mm)

per inch of height but need not be less than .016 (0.41 mm) for any height, and are referenced to the maximum

specified case dimensions.

12. Templates used for verifying mounting stud dimensions are a minimum of .375 (9.52 mm) inch thick and

have nominal D, E, S, and L dimensions shown for each case size. The tolerance for template dimensions

D, E, and S is � .001 (0.03 mm) inch, and � .0005 (0.013 mm) inch for dimension L.

FIGURE 1. Envelope and mounting dimensions � Continued.