MIL-DTL-28731/33D
NOTES:
1. Dimensions are in inches.
2. Metric equivalents are given for information only.
3. Tolerances between any two contact centers shall be ± .004 (0.10 mm).
4. Flatness, squareness, and parallelism shall be within dimensional tolerances.
5. Contact hole details shall be in accordance with configuration B.
6. Mating connector information:
M28731/33-0001 mate with M28731/34-0003 and M28731/34-0005.
M28731/33-0002 mate with M28731/34-0004 and M28731/34-0006.
M28731/33-0003 and M28731/33-0005 mate with M28731/34-0001.
M28731/33-0004 and M28731/33-0006 mate with M28731/34-0002.
7. Polarization information: Polarization pins are provided for indexing to preclude intermixing of
adjacent connectors. By using a standard type spanner wrench, polarization pins can be rotated to
desired position. For parts supplied directly to the government, polarization will be in the 1-1 position.
For other polarization positions, see connector polarization guide configuration A (see marking, note
13d). For direct government acquisition a tool is supplied in the unit package for polarization socket
adjustment.
8. Contact and terminal designations: Contacts and terminals shall be designed on the insulator using
letters in the location shown on figure 1.
9. Tolerance shall be ± .010 (0.25 mm) unless otherwise specified.
10. Patent notice: Patent No. 3,675,185 owned by Elco Corporation. The government has a royalty-free
license under the above patent for the benefit of manufacturers of items called for in this specification,
either for the government or for use in equipment to be delivered to the government.
11. For direct government acquisition crimp contacts M28731/35-0001 (see table I) are furnished in a
plastic bag in each unit package (see marking, note 13a).
12. For direct government acquisition wrappost contacts M28731/36-0001 (see table I) and are factory
installed in connector body (see marking, note 13a).
13. Marking:
a. Connectors supplied directly to the government shall be marked with the Part or Identifying
Number (PIN) (see table I). Example: M28731/33-0001.
b. Connectors supplied with contacts to government end users shall be marked with the PIN (see
table I). Example: M28731/33-0001.
c. Connectors supplied without contacts to government end users shall be marked as follows:
Example: M28731/33E (screw type or socket type from table I). The user shall complete the
remaining portion of the military PIN as shown in table I based upon contact type he assembles.
Example: M28731/33E-0004.
d. Polarization position marking is not required unless otherwise specified. When required,
polarization marking shall be in accordance with the connector polarization guide (see
configuration A). The marking shall appear following the PIN.
14. Applicable contact insertion and removal tools:
Insertion - MIL-I-81969/5-01
Removal - MIL-I-81969/4-02
15. Rectangular shields: Shall conform to MIL-DTL-28731/19, PIN M28731/19-0007 through M28731/19-
0012, M28731/19-0019, and M28731/19-0020 for type A and B hardware.
16. Recommended hardware (not furnish) for panel mounting: (Four) .112-40-UNC-2A (length to suit)
bolts with No. 4 washer and mating nut.
FIGURE 1. Connector, male rectangular Continued.
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