| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.350 INCHES MINIMUM |
| FASTENER LENGTH | 4.395 INCHES MINIMUM AND |
| 4.400 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 410 OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND |
| 45.0 ROCKWELL C MAXIMUM OVERALL |
| STYLE DESIGNATOR | CONCENTRIC HOLE UNTHREADED |
| SHOULDER DIAMETER | 0.3745 INCHES MINIMUM AND |
| 0.3750 INCHES MAXIMUM |
| SHOULDER LENGTH | 3.955 INCHES MINIMUM AND |
| 3.960 INCHES MAXIMUM |
| CONCENTRIC HOLE DEPTH | 3.656 INCHES MINIMUM AND |
| 3.781 INCHES MAXIMUM |
| CONCENTRIC HOLE DIAMETER | 0.195 INCHES MINIMUM AND |
| 0.201 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| HEAD HEIGHT | 0.150 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.688 INCHES NOMINAL |
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 4.217 INCHES MINIMUM AND |
| 4.222 INCHES MAXIMUM FIRST HOLE |
| SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES MINIMUM AND |
| 0.086 INCHES MAXIMUM FIRST HOLE |
| TEST DATA DOCUMENT | 81349-MIL-I-6868 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.). |
| THE MANUFACTURERS DATA | |
| MANUFACTURERS CODE | 61174 |
| DESIGN CONTROL REFERENCE | A51M42516-11 |