| MRC | Criteria | Characteristic |
|---|---|---|
| AAJD | THREAD CLASS | 2A |
| AAJF | THREAD DIRECTION | RIGHT-HAND |
| AASA | THREAD LENGTH | 0.342 INCHES NOMINAL |
| AASB | FASTENER LENGTH | 0.405 INCHES NOMINAL |
| AASK | HEAD STYLE | PAN NO. 2 |
| AASL | HEAD DIAMETER | 0.625 INCHES NOMINAL |
| AASU | HEAD HEIGHT | 0.125 INCHES NOMINAL |
| AATN | SHOULDER DIAMETER | 0.372 INCHES MINIMUM FIRST SHOULDER AND 0.374 INCHES MAXIMUM FIRST SHOULDER |
| AATX | SHOULDER LENGTH | 0.283 INCHES MINIMUM FIRST SHOULDER AND 0.285 INCHES MAXIMUM FIRST SHOULDER |
| ABQZ | INTERNAL DRIVE STYLE | SLOT |
| AHYM | NOMINAL THREAD DIAMETER | 0.312 INCHES |
| CMLP | THREAD QUANTITY PER INCH | 18 |
| CWYB | SHOULDER SHAPE | ROUND FIRST SHOULDER |
| FEAT | SPECIAL FEATURES | UNDERCUT BELOW SHOULDER 0.063 IN. LG,0.230-0.240 IN. DIA |
| MATT | MATERIAL | COPPER ALLOY OVERALL |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | QQ-B-637,AL 464,1/2 HARD FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| THSD | THREAD SERIES DESIGNATOR | UNC |
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