| 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 | ||||
| 5355-00-871-8773 (5355008718773) | 5340-01-243-1107 (5340012431107) | 5315-01-506-6976 (5315015066976) | 5360-01-371-2450 (5360013712450) | |
| 5305-01-613-5639 (5305016135639) | 5330-01-519-5567 (5330015195567) | 5310-01-577-1001 (5310015771001) | 5342-01-650-6980 (5342016506980) | |
| 5325-01-544-9407 (5325015449407) | 5330-01-276-9620 (5330012769620) | 5340-01-659-7595 (5340016597595) | 5340-01-362-7603 (5340013627603) | |
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