| 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 | 0.7505 INCHES NOMINAL |
| MATERIAL | STEEL COMP 303 OR |
| STEEL COMP 304 OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS 2700,METHOD 1,CLASS 4 NATIONAL STD/SPEC 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 |
| INTERNAL DRIVE STYLE | SLOT |
| SHOULDER SHAPE | ROUND ALL SHOULDERS |
| SHOULDER DIAMETER | 0.3110 INCHES MINIMUM AND |
| 0.3120 INCHES MAXIMUM ALL SHOULDERS |
| SHOULDER LENGTH | 0.310 INCHES MINIMUM AND |
| 0.316 INCHES MAXIMUM ALL SHOULDERS |
| SPECIFICATION/STANDARD DATA | 80205-NASM51575 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW,SHOULDER,SLOTTED HEAD,CRES |