| Item Name | Screw Close Tolerance |
| Federal Supply Group (FSG) | Hardware and Abrasives |
| Federal Supply Class (FSC) | 5305 Screws |
| National Item Identification Number (NIIN) | 01-421-7541 (014217541) |
| NCB Code | USA (01) |
| Manufacturer | National Aerospace Standards Com |
| Part Number | Manufacturer | Item Name | Cage Code | RFQ |
|---|---|---|---|---|
| NAS1580C4R21DP | national aerospace standards com | screw close tolerance | 80205 | RFQ |
| MRC | Criteria | Characteristic |
|---|---|---|
| AASK | Head Style | FLAT COUNTERSUNK |
| AAWB | Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM FIRST HOLE AND 0.086 INCHES MAXIMUM FIRST HOLE |
| CMLP | Thread Quantity Per Inch | 28 |
| SFTT | Surface Treatment | CADMIUM OVERALL AND CHROMATE OVERALL |
| THSD | Thread Series Designator | UNJF |
| AASA | Thread Length | 0.403 INCHES NOMINAL |
| AASL | Head Diameter | 0.464 INCHES MINIMUM AND 0.506 INCHES MAXIMUM |
| MDCL | Material Document And Classification | AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OVERALL OR AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OVERALL OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| CRZS | Distance From Head Largest Bearing Surface To Shank Hole Center | 1.599 INCHES NOMINAL FIRST HOLE |
| AAJF | Thread Direction | RIGHT-HAND |
| ABQZ | Internal Drive Style | TORQUE-SET RIBBED |
| ANEE | Grip Length | 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM |
| AHYM | Nominal Thread Diameter | 0.250 INCHES |
| AASB | Fastener Length | 1.700 INCHES MINIMUM AND 1.730 INCHES MAXIMUM |
| ZZZK | Specification/Standard Data | 80205-NAS1580 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| AAUR | Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM |
| CRSQ | Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| MRC | Decoded Requirement | Clear Text Reply |
| MATT | Material | IRON ALLOY 660 OVERALL |
| STDC | Surface Treatment Document And Classification | QQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| AAJD | Thread Class | 3A |
| Relevant Components for NSN - 5305-01-421-7541, 5305014217541 | ||||
| 5320-01-093-5687 (5320010935687) | 5340-00-286-8500 (5340002868500) | 5310-00-797-4430 (5310007974430) | 5331-01-548-6940 (5331015486940) | |
| 5340-01-389-2408 (5340013892408) | 5340-01-499-3481 (5340014993481) | 5310-01-418-9739 (5310014189739) | 5320-01-419-8697 (5320014198697) | |
| 5340-01-681-6722 (5340016816722) | 5340-01-620-4639 (5340016204639) | 5340-01-481-2087 (5340014812087) | 5331-01-097-0869 (5331010970869) | |
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