| THREAD SERIES DESIGNATOR | UNRC |
| NOMINAL THREAD DIAMETER | 0.1380 INCHES |
| THREAD QUANTITY PER INCH | 32 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.289 INCHES MINIMUM AND |
| 0.319 INCHES MAXIMUM |
| FASTENER LENGTH | 0.319 INCHES MINIMUM AND |
| 0.375 INCHES MAXIMUM |
| MATERIAL | IRON ALLOY HEAD |
| STEEL CORROSION RESISTING PRIMARY WASHER |
| IRON ALLOY THREADS |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS5731 NATIONAL SPEC SINGLE MATERIAL RESPONSE OR |
| AMS5737 NATIONAL SPEC SINGLE MATERIAL RESPONSE HEAD |
| ASTM A240 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE PRIMARY WASHER |
| AMS5731 NATIONAL SPEC SINGLE MATERIAL RESPONSE OR |
| AMS5737 NATIONAL SPEC SINGLE MATERIAL RESPONSE THREADS |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OR |
| AMS2700 NATIONAL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HEAD STYLE | FLAT CHAMFER |
| HEAD DIAMETER | 0.218 INCHES MINIMUM AND |
| 0.226 INCHES MAXIMUM |
| HEAD HEIGHT | 0.134 INCHES MINIMUM AND |
| 0.138 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 0.262 INCHES MINIMUM AND |
| 0.282 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.013 INCHES MINIMUM AND |
| 0.019 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.109 INCHES NOMINAL |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW, CAPTIVE WASHER ASSEMBLY A-286 CRES, 160 KSI TENSILE SIZES: 0.0860THRU 0.1900 (UNRC-3A) |