| MRC | Criteria | Characteristic |
|---|---|---|
| AAJD | THREAD CLASS | 2A |
| AAJF | THREAD DIRECTION | RIGHT-HAND |
| AASA | THREAD LENGTH | 0.250 INCHES NOMINAL |
| AASB | FASTENER LENGTH | 0.250 INCHES NOMINAL |
| AASK | HEAD STYLE | FLAT CHAMFER |
| AASL | HEAD DIAMETER | 0.178 INCHES MINIMUM AND 0.183 INCHES MAXIMUM |
| AASU | HEAD HEIGHT | 0.109 INCHES MINIMUM AND 0.112 INCHES MAXIMUM |
| ABQZ | INTERNAL DRIVE STYLE | HEXAGON |
| AHYM | NOMINAL THREAD DIAMETER | 0.112 INCHES |
| ASDB | WIDTH ACROSS FLATS | 0.078 INCHES MINIMUM AND 0.079 INCHES MAXIMUM |
| CMLP | THREAD QUANTITY PER INCH | 40 |
| CQFM | HARDNESS RATING | 38.0 ROCKWELL C MINIMUM OVERALL AND 42.0 ROCKWELL C MAXIMUM OVERALL |
| MATT | MATERIAL | STEEL COMP 4037 OVERALL |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| SFTT | SURFACE TREATMENT | PHOSPHATE OVERALL |
| THSD | THREAD SERIES DESIGNATOR | UNC |
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