| FASTENER LENGTH | 10.85 MILLIMETERS MINIMUM AND 11.35 MILLIMETERS MAXIMUM |
| GRIP LENGTH | 2.00 MILLIMETERS MINIMUM AND 2.50 MILLIMETERS MAXIMUM |
| HARDNESS RATING | 321.0 BRINELL STANDARD MINIMUM OVERALL AND 388.0 BRINELL STANDARD MAXIMUM OVERALL |
| HEAD HEIGHT | 7.45 MILLIMETERS MINIMUM AND 7.95 MILLIMETERS MAXIMUM |
| HEAD STYLE | DOUBLE HEXAGON EXTENDED WASHER |
| MATERIAL DOCUMENT AND CLASSIFICATION | DTD 5066 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE |
| 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 |
| STRENGTH GRADE DESIGNATION | ERR-030 |
| SURFACE FINISH | 0.8 MICROMETERS THREADS |
| SURFACE FINISH | 0.8 MICROMETERS BEARING SURFACE OF HEAD |
| SURFACE FINISH | 0.8 MICROMETERS GRIP |
| SURFACE FINISH | 3.2 MICROMETERS TOP OF HEAD |
| SURFACE FINISH | 3.2 MICROMETERS SIDES OF HEAD |
| TEST DATA DOCUMENT | U1653-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 | 8.84 MILLIMETERS NOMINAL |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNJF |
| EXTENDED WASHER THICKNESS | 1.52 MILLIMETERS MINIMUM |
| EXTENDED WASHER DIAMETER | 10.88 MILLIMETERS MINIMUM AND 11.38 MILLIMETERS MAXIMUM |