| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.2500 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.4063 INCHES MINIMUM AND |
| 0.4687 INCHES MAXIMUM |
| FASTENER LENGTH | 1.6875 INCHES NOMINAL |
| MATERIAL | STEEL COMP 303 OR |
| STEEL COMP 304 OR |
| STEEL COMP 302 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | CONDITION A IAW ASTM A582/A582M AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) 1ST MATERIAL RESPONSE OR |
| ASTM A493 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) 2ND MATERIAL RESPONSE OR |
| CRES 302HW IAW ASTM A493 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) 3RD MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | CRES 303 PASSIVATED PER AMS2700,METHOD 1,TYPE II,CLASS 4;CRES 304 AND 302HQ PASSIVATED PER AMS2700,METHOD 1,TYPE 6 OR 7,CLASS 4 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| HEAD STYLE | FLAT CHAMFER |
| HEAD DIAMETER | 0.4688 INCHES MINIMUM AND |
| 0.5312 INCHES MAXIMUM |
| HEAD HEIGHT | 0.1875 INCHES MINIMUM AND |
| 0.2499 INCHES MAXIMUM |
| CHAMFER ANGLE | 30.0 DEGREES MINIMUM AND |
| 45.0 DEGREES MAXIMUM |
| INTERNAL DRIVE STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.1560 INCHES NOMINAL |
| SHOULDER SHAPE | ROUND ALL SHOULDERS |
| SHOULDER DIAMETER | 0.3110 INCHES MINIMUM AND |
| 0.3120 INCHES MAXIMUM ALL SHOULDERS |
| SHOULDER LENGTH | 1.247 INCHES MINIMUM AND |
| 1.253 INCHES MAXIMUM ALL SHOULDERS |
| SPECIFICATION/STANDARD DATA | 80205-NASM51576 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW,SHOULDER,SOCKET-HEAD,HEXAGON,CORROSION-RESISTANT STEEL |