MIL-DTL-15291G
6.6 Part or Identifying Number (PIN). The PIN to be used for switches acquired to this specification is
created as follows:
M
15291/
1
-001
Example M15291/1-001
Dash number designated on specification sheet
Specification sheet number
General specification number
Prefix to indicate an item defined by inch-pound units.
6.7 Type designations. Type designations assigned in previous issues of this specification are cross
referenced to superseding PINs in the specification sheets (see 3.1 and 6.7). The type designations are
in the following form and have the significance indicated.
SR
N
1
B
4
A
Class
Positioning
Poles
Switching
Mounting
Variation
(6.7.1)
characteristic
connection
symbol
(1.2)
mechanism
(1.2.1)
(6.7.2)
and handle
(6.7.4)
arrangement
(6.7.3)
6.7.1 Poles. The number of poles are identified by a number equal to the number of single circuits
simultaneously controlled by the switch. The symbol "S" should be substituted for the digit when the
switch has a special switching characteristic (see 6.7.2).
6.7.2 Switching characteristic. The switching characteristics are identified by a one-letter symbol
describing the electrical changing characteristic for a typical pole of the switch in accordance with
table X.
6.7.3 Mounting, connection, and handle arrangement. The type of mounting, the method of wiring
stationary contacts, and the handle or shaft arrangement should be identified by a one-digit symbol in
accordance with the following:
1. Front mounted-back connected-handle supplied with switch.
2. Front mounted-side connected-handle supplied with switch.
3. Base mounted-side connected-shaft designed for handle, handle not supplied.
4. Base mounted-side connected-shaft designed for coupling to external shaft.
6.7.4 Variation symbol. The variation symbol should start with the letter A and continue alphabetically.
It should be used to differentiate switches having the same type designation but varying in either
mechanical or electrical characteristics.
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