| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.369 INCHES MINIMUM AND |
| 0.431 INCHES MAXIMUM |
| FASTENER LENGTH | 1.772 INCHES MINIMUM AND |
| 1.882 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 301 OR |
| STEEL COMP 302 OR |
| STEEL COMP 304 OR |
| STEEL COMP 316 SECONDARY WASHER |
| STEEL COMP 301 OR |
| STEEL COMP 302B OR |
| STEEL COMP 303 OR |
| STEEL COMP 303SE OR |
| STEEL COMP 305 OR |
| STEEL COMP 308 OR |
| STEEL COMP 309S OR |
| STEEL COMP 310S OR |
| STEEL COMP 314 OR |
| STEEL COMP 316 OR |
| STEEL COMP 316L OR |
| STEEL COMP 317 OR |
| STEEL COMP 347 OR |
| STEEL COMP 348 OR |
| STEEL COMP 384 OR |
| STEEL COMP 385 PRIMARY WASHER |
| STEEL COMP 304 SPRING |
| STEEL COMP 304L OR |
| STEEL COMP 309 OR |
| STEEL COMP 310 OR |
| STEEL COMP 321 OR |
| STEEL COMP 322 OR |
| STEEL COMP 324 OR |
| STEEL COMP 347 STAND-OFF |
| STEEL COMP XM-13 FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5059 MIL SPEC ALL MATERIAL RESPONSES SECONDARY WASHER |
| 66 FED STD ALL MATERIAL RESPONSES PRIMARY WASHER |
| ASTM A313 ASSN STD ALL MATERIAL RESPONSES SPRING |
| QQ-S-763 FED SPEC ALL MATERIAL RESPONSES STAND-OFF |
| AMS5629 ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 35.0 ROCKWELL C MINIMUM AND |
| 43.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| 35.0 ROCKWELL C MINIMUM AND |
| 45.0 ROCKWELL C MAXIMUM SPRING |
| MINIMUM TENSILE STRENGTH | 175000 POUNDS PER SQUARE INCH |
| HEAD STYLE | HEXAGON |
| HEAD HEIGHT | 0.178 INCHES MINIMUM AND |
| 0.198 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.367 INCHES MINIMUM AND |
| 0.375 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | W/O INTERNAL DRIVE |
| SPECIAL FEATURES | POINT LENGTH 0.205MIN AND 0.235MAX |