| CONCENTRIC HOLE DIAMETER | 0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM |
| FASTENER LENGTH | 1.406 INCHES NOMINAL |
| HEAD HEIGHT | 0.625 INCHES NOMINAL |
| HEAD STYLE | HEXAGON |
| INTERNAL THREAD DIRECTION | RIGHT-HAND COUNTERBORE |
| INTERNAL THREAD LENGTH | 0.219 INCHES NOMINAL COUNTERBORE |
| MATERIAL DOCUMENT AND CLASSIFICATION | 1280-MO GM FSCM 24617 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD SIZE | 0.437 INCHES COUNTERBORE |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| NONSTANDARD INTERNAL THREAD PITCH DIAMETER | +0.4104 TO 0.4128 INCHES COUNTERBORE |
| SHOULDER DIAMETER | 0.371 INCHES MINIMUM AND 0.375 INCHES MAXIMUM |
| SHOULDER LENGTH | 0.750 INCHES NOMINAL |
| SPECIAL FEATURES | CONCENTRIC HOLE COUNTERBORED TO 0.253 IN MIN 0.257 IN MAX DIA BY 3/16 IN DEEP ON HEAD END |
| STYLE DESIGNATOR | COUNTERBORE THREADED |
| WIDTH BETWEEN FLATS | 0.500 INCHES NOMINAL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | 4252-M,CL A FSCM 24617 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | ZINC OVERALL |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD CLASS | 3A |
| THREAD LENGTH | 0.531 INCHES MINIMUM |
| THREAD SERIES DESIGNATOR | UNC |
| THREAD SERIES | UNS COUNTERBORE |
| THREAD QUANTITY PER INCH | 18 |
| THREADS PER INCH | 24 COUNTERBORE |