Multi-Deck Rotary Switches
SPECIFICATIONS
Military Shaft and Panel Seal
Military Qualification MIL-DTL-3786/39
The military style of the Series 71 rotary switch switchwithoutincreasingthenumberofoperative
is qualified to MIL-DTL-3786/39. Complete decks.
A shaft and panel seal is available to provide
watertight mounting of the Series 71 standard
military style rotary switches. Sealing is
accomplished by an O-ring shaft seal and a
panel seal washer. Panel seal dimension
differences are shown in the dimensional
drawings.Whenthepanelsealiscompressed,
dimensions are approximately the same as an
unsealed switch. If the non-turn washer
supplied with the switch is used, it should not
be allowed to extend entirely through the
panel when mounting a sealed switch.
However, the bushing may be used as a non-
turn device instead. Switches are provided
with a double flat bushing in styles which
include the letter A and with a bushing which
has a keyway in the styles which include the
letter B.
electrical rating information is listed on the
following page. The Series 71 rotary switch Another difference in the standard and military
qualificationincludesthe30°andthe36°angles styles is the mounting hardware. Ordered as
of throw, in .125" (3,18) and .250" (6,35) options with a standard style switch these items
diameter shafts, with solder lug terminals and are included with the military style switch: non-
printedcircuitterminals,insealedandunsealed turn washer with solder lug style and a non-turn
style switches. Standard variations such as washer plus a mounting bushing washer with
shaft and/or bushing length, etc. that do not the PC terminal style.
affect the switch performance can also be
marked as qualified product. Contact Grayhill Complete specification drawings are available
for complete details.
from Grayhill, Inc. for the standard military
qualified products. Military qualified Series 71
rotary switches may be ordered by the “M”
number listed in Military Specification Sheet/39
orbyGrayhillpartnumber. Allqualifiedswitches
will be marked to the specification.
Dimensionally the military style is the same as
the standard style with the exception of the PC
version of 3 or 4 decks; a spacer deck between
decks 2 and 3 adds another deck length to the
SPECIFICATIONS: Materials and Finishes
MaterialsandFinishes
Standard Style
Cover: Diallyl per (MIL-M-14) ASTM-D-
5948 except for 71 BT (see bushing).
Base and Deck Separator: Diallyl per
(MIL-M-14) ASTM-D-5948
Rotor Mounting Plate: Thermoplastic
Bushing: Zinc casting, tin/zinc-plated.
Through Bolts and Nuts, Shaft and Rear
Support Plate, Stop Pins and Stop Arm
(All Others): Stainless steel
Shaft, Stop Plates, Stop Arm (71BT):
Reinforced thermoplastic
Detent Rotor: Reinforced thermoplastic for
71BT; phenolic per (MIL-M-14) ASTM-D-
5948 for all others
Detent Balls: Steel, nickel-plated
Detent Springs: Tinned music wire
Rotor Contact: Silver alloy and beryllium
copper
Base Contacts, Common Plate and
Terminals: Brass, Gold plate .000005"
minimum over Silver plate .00005" over
nickel .00002".
Detent Rotor: Phenolic per (MIL-M-14)
ASTM-D-5948
Mounting Hardware: One mounting nut and
one internal tooth lockwasher are supplied with
each switch. For switches with A in the style
description, the nut is .062" (1,57) thick by
.312" (7,92) across flats. For switches with B or
C in the style description, the nut is .094" (2,39)
thick by .562" (14,27) across flats. Nuts are
brass, tin/zinc-plated or stainless steel.
Mounting Hardware: One mounting nut and
one internal tooth lockwasher are supplied
with each Series 71 switch. For switches with
Style A in the description, the nut is .062"
(1,57) thick by .312" (7,92) across flats. For
switches with Style B or C in the description,
the nut is .094" (2,39) thick by .562" (14,27)
across flats. Nuts are brass, tin/zinc-plated or
stainless steel.
Additional Hardware: Each switch is
supplied with a non-turn washer to use if
desired. Additionally, each PC mount switch
is supplied with a mounting bushing washer
(see PC Mount Accessory). For switches
with Style A in the description, non-turn
washer is stainless steel; for switches with
Style B in the description, non-turn washer is
stainless steel. Mounting bushing washer
(PC Mount Accessory) is brass, tin/zinc-
plated.
Materials and Finishes
Military Qualified
Cover, Base and Deck Separator: Diallyl per
(MIL-M-14) ASTM-D-5948
Rotor Mounting Plate: Thermoplastic
Bushing: Zinc casting, tin/zinc-plated
Through Bolts and Nuts, Shaft Extension,
Lockwashers, Shaft and Rear Support
Plate, Stop Pins and Stop Arm (All
Others): Stainless steel
Detent Balls: Steel, nickel-plated
Detent Springs: Tinned music wire
Rotor Contact: Silver alloy and beryllium
copper
Front Support Plate (71 BT only):
Tempered steel, tin/lead-plated.
Interdeck Seal (71 BT Only): Silicone
Extension: Brass, unplated
Base Contacts, Common Plate and Terminals:
Brass, goldplate.000005"minimumoversilver
plate .00005" over Nickel .00002".
Rotary
10
Grayhill, Inc.
• 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com