| EXTENDED WASHER THICKNESS | 0.060 INCHES MINIMUM |
| EXTENDED WASHER DIAMETER | 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM |
| FASTENER LENGTH | 1.688 INCHES NOMINAL AND 1.678 INCHES MINIMUM AND 1.698 INCHES MAXIMUM |
| FEATURES PROVIDED | FINISHED HEAD |
| GRIP LENGTH | 0.878 INCHES MINIMUM AND 0.938 INCHES MAXIMUM |
| HARDNESS RATING | 321.0 BRINELL STANDARD MINIMUM AND 388.0 BRINELL STANDARD MAXIMUM OVERALL |
| HEAD HEIGHT | 0.293 INCHES MINIMUM AND 0.313 INCHES MAXIMUM |
| HEAD STYLE | DOUBLE HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | DTD 5066 GOVERNMENT STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| MINIMUM TENSILE STRENGTH | 159040 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| WIDTH BETWEEN FLATS | 0.307 INCHES MINIMUM AND 0.313 INCHES MAXIMUM |
| SURFACE FINISH | 125.0 MICROINCHES SIDES OF HEAD |
| SURFACE FINISH | 125.0 MICROINCHES TOP OF HEAD |
| SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| SURFACE FINISH | 32.0 MICROINCHES GRIP |
| SURFACE FINISH | 32.0 MICROINCHES THREADS |
| TEST DATA DOCUMENT | U14C6-TS-22 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.). |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.780 INCHES NOMINAL |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNJF |