| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.138 INCHES |
| THREAD QUANTITY PER INCH | 32 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.187 INCHES MINIMUM AND |
| 0.312 INCHES MAXIMUM |
| FASTENER LENGTH | 0.280 INCHES MINIMUM AND |
| 0.312 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 301 OR |
| STEEL COMP 304 OR |
| STEEL COMP 316 OR |
| STEEL COMP 347 OR |
| STEEL COMP 348 SECONDARY WASHER |
| STEEL COMP 301 OR |
| STEEL COMP 302 OR |
| STEEL COMP 302B OR |
| STEEL COMP 303 OR |
| STEEL COMP 303SE OR |
| STEEL COMP 304L OR |
| STEEL COMP 305 OR |
| STEEL COMP 308 OR |
| STEEL COMP 309 OR |
| STEEL COMP 309S OR |
| STEEL COMP 310 OR |
| STEEL COMP 310S OR |
| STEEL COMP 314 OR |
| STEEL COMP 316L OR |
| STEEL COMP 317 OR |
| STEEL COMP 321 OR |
| STEEL COMP 348 OR |
| STEEL COMP 384 OR |
| STEEL COMP 385 PRIMARY WASHER |
| STEEL COMP 430 OR |
| STEEL COMP 303SE FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5059 MIL SPEC ALL MATERIAL RESPONSES OR |
| MIL-S-6721 MIL SPEC ALL MATERIAL RESPONSES SECONDARY WASHER |
| 66 FED STD ALL MATERIAL RESPONSES PRIMARY WASHER |
| QQ-S-763 FED SPEC 1ST MATERIAL RESPONSE OR |
| MIL-S-7720 MIL SPEC 2ND MATERIAL RESPONSE OR |
| ASTM A582 ASSN STD 3RD MATERIAL RESPONSE OR |
| ASTM A582 ASSN STD 4TH MATERIAL RESPONSE FASTENER |
| SURFACE TREATMENT | PASSIVATE SECONDARY WASHER |
| PASSIVATE PRIMARY WASHER |
| PASSIVATE FASTENER |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE PRIMARY WASHER |
| HARDNESS RATING | 35.0 ROCKWELL C MINIMUM AND |
| 43.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| HEAD STYLE | PAN |
| HEAD DIAMETER | 0.256 INCHES MINIMUM AND |
| 0.270 INCHES MAXIMUM |
| HEAD HEIGHT | 0.087 INCHES MINIMUM AND |
| 0.097 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
| WASHER QUANTITY | 2 |
| PRIMARY WASHER STYLE | SPLIT HELICAL RING |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.250 INCHES MAXIMUM |
| PRIMARY WASHER MATERIAL THICKNESS | 0.031 INCHES MINIMUM |
| SECONDARY WASHER RELATIONSHIP TO PRIMARY WASHER | NOT IDENTICAL |
| SECONDARY WASHER STYLE | FLAT |
| SECONDARY WASHER OUTSIDE DIAMETER | 0.253 INCHES MINIMUM AND |
| 0.263 INCHES MAXIMUM |
| SECONDARY WASHER MATERIAL THICKNESS | 0.013 INCHES MINIMUM AND |
| 0.019 INCHES MAXIMUM |
| SPECIFICATION/STANDARD DATA | 80205-NAS1301 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |