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|  MIL-H-63192 (AR)
Thread Size
Torque
.112
-
48UNF
9
-10
inch-pounds
.138
-
32uNF
16
- 18
inch-pounds
.164
-
32UNF
30
- 33
inch-pounds
.190
-
24uNF
40
- 45
inch-pounds
.190
-
32uNF
45
- 50
inch-pounds
.250
-
20UNF
8
-10
foot-pounds
.375
-
16UNF
30
- 33
foot-pounds
.500
-
13uNF
75
- 80
foot-pounds
.625
-
llUNF
150
- 165
foot-pounds
3.3 Performance and product characteristics.
3.3.1 Lunette assembly.-The lunette assembly shall be
capable of being secured in the firing, down and towing position
by the lunette operating lever.
3.3.2 Locking devices.-All locking and fastening devices
for securing component parts shall be positive in action.
3.3.3 Handbrakes.-The handbrakes when engaged, shall pre-
vent wheel rotation while the howitzer is in a level, ascending
or descending travel position.
When the handbrake is disengaged,
the wheels shall turn freely with minimum drag.
3.3.4 Trunion adapter plates.-The trunion adapter plates
shall maintain a verticle plane within + 0.2 mil when the cannon
is elevated from O to 1275-mils.
The trunion adapter plate keys
shall be parallel with the cannon tube centerline within + 0.2 mil.
These measurements shall be preceded by cross-leveling of-the
carriage trunion centerline as specified in 3.3.9.1.
3.3.5 Wheel actuator.-The wheel actuator shall be capable of
raising the wheels and lowering and raising the base Plate to
the firing and travel positions.
The actuator shall be self
locking throughout the range of operation.
The slip clutch
limiter shall be adjusted to raise the weapon into travel lock
with 400 + 50 lbs on the base plate and insure slippage with
550 + 50 lbs.
3.3.6 Base plate.-The base plate socket in hte center of
the base plate, is the point at which the weapon shall be
secured and permit the weapon to be traversed 360 degrees.
Stability shall be provided by grousers protruding from the
bottom of the base plate.
3.3.7 Traversing mechanism.-With the howitzer in the firing
position, the traversing mechanism shall be capable of traversing
the howitzer 360 degrees in either direction.
The torque required
6
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