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|  MIL-U-20625A
3.2.6 Fastenings. Set screws shall not be
3.2.1 Sizes. Universal joints shall be desig-
used in universal joints.
nated by the outside diameter of the hub
(see D of table III). For a given shaft size
the joint shall be equal to or larger than that
3.3 Performance. The universal joint shall
specified in table III.
be capable of transmitting the static torques
shown in table II at the indicated angle with-
3.2.2 Hubs, Unless otherwise specified in
out rupture, permanent set, or other evidence
the contract or order, the joints shall be fur-
of failure.
nished with the hubs machined with centers
but not drilled for shafting. When so speci-
3.3.1 Backlash. The universal joint shall
fied, the diameter and length of the hubs shall
exhibit no more than the maximum backlash
conform to table III for the shaft size indi-
set forth in table IV.
cated.
3.2.3 Bearing pins. The bearing pins, when
assembled with the hubs and block shall not
project outward beyond the yoke and shall
be positively secured in operating position so
that operation will not cause the pins to be-
come loose or drop out.
3.2.4 Dimensional tolerances. Clearance
permitted between pins and holes shall be
0.001 inch maximum. Clearance between
block and yoke shall be 0.004 inch maximum.
Pins may be off-center 0.005 inch maximum.
All other dimensions shall be plus or minus
0.020 inch,
3.2.5 Lubrication. An oil passage shall be
3.3.2 Efficiency. The universal joint shall
provided in one of the pins through which a
transmit the torques shown in table II with
lubricant may be applied to the working
an efficiency of not less than 98 percent with
surfaces,
the axes of the hubs at 180 degrees, and 80
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