A-A-54350
The threaded portion of the bolt shall extend to and approximate the head of the screw. As an alternate, a shoulder of the same diameter of the bolt shall extend to the head of the screw. The external threads of the bolt shall allow the “GO” thread ring gages to pass over their full length and turn freely and shall not allow passage of the “LO” and “NOT GO” thread ring gages.
The following dimensional notations shall be inscribed on the ring gages:
|
THREAD SIZE |
3-48 UNC-2A |
|
“GO” PITCH DIAMETER |
0.0848 |
|
“LO” PITCH DIAMETER |
0.0825 |
|
“GO” MAJOR DIAMETER |
0.0983 |
|
“NOT GO” MAJOR DIAMETER |
0.0938 |
Internal threads of the nuts shall allow the “GO” thread plug gages to be inserted and turned freely, and shall not allow entry of the “HI” and “NOT GO” thread plug gages.
The following dimensional notations shall be inscribed on the plug gages:
|
THREAD SIZE |
3-48 UNC-2A |
|
“GO” PITCH DIAMETER |
0.0855 |
|
“LO” PITCH DIAMETER |
0.0885 |
|
“GO” MINOR DIAMETER |
0.0764 |
|
“NOT GO” MINOR DIAMETER |
0.0845 |
The gaging procedure to be used for internal and external thread, dimensions, tolerances and gage identifications shall be in accordance with ANSI Standard B1.2. Fits of gages onto the bolt threads shall be noted.
Tibial bolt shall be in accordance with Defense Personnel Support Center (DPSC) Drawing No. 10130.
Finish. The washers, nuts and heads of the bolt shall have a mirror finish. The bolt proper (excluding washers and nuts) shall not be electropolished. Definitions of acceptable surface characteristics shall be as described in ASTM F86.
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