MIL-DTL-20625B
4.3 Test procedures.
4.3.1 Backlash. The backlash of the joints shall not exceed the amount specified in table IV when the joint is
mounted in a test apparatus with the hubs at 180 degrees. The following details shall apply:
a. Apply a torque of 3.5 to 4.5 inch-pounds for joint sizes 3/16 through 3/4inch or 7.5 to 8.5 inch-pounds for all
other sizes to the universal joint to obtain the initial reading.
b.
The torque load shall then be reversed and a second reading taken.
c.
The backlash at the circumference of the universal joint is the difference between the two readings.
4.3.2 Torque. The joint shall be subjected to the torques specified in table II at four or more radial positions of
the hub and at the angles specified. The load shall be sustained at each position for 3 minutes.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or
order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these
personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging
requirements are maintained by the Inventory Control Point s packaging activities within the Military Service or
Defense Agency, or within the military service s system commands. Packaging data retrieval is available from the
managing Military Department s or Defense Agency s automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. Class A universal joints are intended for general purpose use in mechanical remote control
systems. Class B joints are intended for use where corrosive conditions are abnormal or nonmagnetic materials are
required. Class C joints are intended for use where corrosive conditions are abnormal or high torque requirements
are desired.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
b.
Class required (see 1.2).
c.
Number of each size required; designated by hub outside diameter (see 3.3.1).
d.
Shaft size (see 3.3.2).
e.
f.
Packaging requirements (see 5.1).
6.3 Environmentally preferable material. Environmentally preferable materials should be used to the maximum
extent possible to meet the requirements of this specification. As of the dating of this document, the U.S.
Environmentally Protection Agency (EPA) is focusing efforts on reducing 31 priority chemicals. The list of
chemicals and additional information is available on their website:
https://www.epa.gov/osw/hazard/wastemin/priority.htm. Included in the EPA list of 31 priority chemicals are
cadmium, lead, and mercury. Use of these materials on the list should be minimized or eliminated unless needed to
meet the requirements specified herein (see 3.2).
6.4 Subject term (key word listing).
Bearing pin
Hub
Torque
6.5 Changes from previous issue. Marginal notations are not used in this revision to identify changes with
respect to the previous issue due to the extent of the changes.
6
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business