| MRC | Criteria | Characteristic |
|---|
| AAJD | THREAD CLASS | 1A |
| AAJF | THREAD DIRECTION | RIGHT-HAND |
| AASA | THREAD LENGTH | 0.350 INCHES MINIMUM AND 0.370 INCHES MAXIMUM |
| AASB | FASTENER LENGTH | 1.700 INCHES MINIMUM AND 1.720 INCHES MAXIMUM |
| AASK | HEAD STYLE | HEXAGON |
| AASU | HEAD HEIGHT | 0.180 INCHES MINIMUM AND 0.200 INCHES MAXIMUM |
| AATB | WIDTH BETWEEN FLATS | 0.555 INCHES MINIMUM AND 0.564 INCHES MAXIMUM |
| AAWB | SHANK UNTHREADED HOLE DIAMETER | 0.065 INCHES MINIMUM FIRST HOLE AND 0.075 INCHES MAXIMUM FIRST HOLE |
| AAWC | FIRST DIAMETER FROM HEAD | 0.372 INCHES MINIMUM AND 0.373 INCHES MAXIMUM |
| AAWD | SECOND DIAMETER FROM HEAD | 0.210 INCHES MINIMUM AND 0.230 INCHES MAXIMUM |
| AAWE | THIRD DIAMETER FROM HEAD | 0.372 INCHES MINIMUM AND 0.373 INCHES MAXIMUM |
| AAWH | DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER | 0.130 INCHES MINIMUM AND 0.150 INCHES MAXIMUM |
| AAWJ | DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER | 1.060 INCHES MINIMUM AND 1.100 INCHES MAXIMUM |
| AAWK | DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER | 1.190 INCHES MINIMUM AND 1.210 INCHES MAXIMUM |
| AHYM | NOMINAL THREAD DIAMETER | 0.250 INCHES |
| CMLP | THREAD QUANTITY PER INCH | 28 |
| CQFM | HARDNESS RATING | 30.0 ROCKWELL C MINIMUM OVERALL AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| CRZS | DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.590 INCHES MINIMUM FIRST HOLE AND 1.610 INCHES MAXIMUM FIRST HOLE |
| CSNG | EXTERNALLY RELIEVED BODY DIAMETER QUANTITY | 3 |
| MATT | MATERIAL | STEEL CORROSION RESISTING OVERALL |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5616 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| THSD | THREAD SERIES DESIGNATOR | UNF |
