| Item Name | Screw Cap Socket Head |
| Federal Supply Group (FSG) | Hardware and Abrasives |
| Federal Supply Class (FSC) | 5305 Screws |
| National Item Identification Number (NIIN) | 01-621-2491 (016212491) |
| NCB Code | USA (01) |
| Manufacturer | Fastenal Company |
| MRC | Criteria | Characteristic |
|---|---|---|
| AHYM | Nominal Thread Diameter | 0.250 INCHES |
| MDCL | Material Document And Classification | ASTM A574 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| AASK | Head Style | FLAT FILLISTER |
| MATT | Material | STEEL OVERALL |
| MRC | Decoded Requirement | Clear Text Reply |
| CXCY | Part Name Assigned By Controlling Agency | 1/4"-28X1" BLACK OXIDE ALLOY STEEL SOCKET CAP SCREW |
| SFTT | Surface Treatment | BLACK CHEMICAL FINISH OVERALL |
| ABQZ | Internal Drive Style | HEXAGON |
| AASB | Fastener Length | 0.97 INCHES MINIMUM AND 1.00 INCHES MAXIMUM |
| AASL | Head Diameter | 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM |
| ASDB | Width Across Flats | 0.1875 INCHES MINIMUM AND 0.1900 INCHES MAXIMUM |
| HUES | Color | BLACK OVERALL |
| AAJF | Thread Direction | RIGHT-HAND |
| THSD | Thread Series Designator | UNRF |
| AASA | Thread Length | 0.97 INCHES MINIMUM AND 1.00 INCHES MAXIMUM |
| CMLP | Thread Quantity Per Inch | 28 |
| AAJD | Thread Class | 3A |
| AASU | Head Height | 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM |
| Relevant Components for NSN - 5305-01-621-2491, 5305016212491 | ||||
| 5320-01-318-6843 (5320013186843) | 5340-01-557-4760 (5340015574760) | 5340-00-336-3776 (5340003363776) | 5340-01-560-8528 (5340015608528) | |
| 5330-01-684-2979 (5330016842979) | 5310-01-185-8686 (5310011858686) | 5360-00-394-4491 (5360003944491) | 5320-01-267-6376 (5320012676376) | |
| 5315-00-432-8021 (5315004328021) | 5315-01-271-9296 (5315012719296) | 5340-01-353-1927 (5340013531927) | 5320-01-413-1816 (5320014131816) | |
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