| MRC | Criteria | Characteristic |
|---|---|---|
| AAJD | THREAD CLASS | 2A |
| AAJF | THREAD DIRECTION | RIGHT-HAND |
| AASA | THREAD LENGTH | 0.500 INCHES MINIMUM |
| AASB | FASTENER LENGTH | 0.500 INCHES NOMINAL |
| AATB | WIDTH BETWEEN FLATS | 0.275 INCHES MINIMUM AND 0.285 INCHES MAXIMUM |
| ABQJ | POINT STYLE | FLAT |
| ABQZ | INTERNAL DRIVE STYLE | SQUARE |
| AHYM | NOMINAL THREAD DIAMETER | 0.562 INCHES |
| CMLP | THREAD QUANTITY PER INCH | 18 |
| CQFM | HARDNESS RATING | 44.0 ROCKWELL C MINIMUM OVERALL AND 48.0 ROCKWELL C MAXIMUM OVERALL |
| MATT | MATERIAL | STEEL OVERALL |
| THSD | THREAD SERIES DESIGNATOR | UNF |
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