The Screw,close Tolerance, cataloged under National Stock Number 5305-01-596-9640, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Textron Aviation Inc. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-596-9640 |
| Primary Part Number | NAS1581C3H2P |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Textron Aviation Inc |
| Status | ACTIVE |
| Fastener Length | 0.472 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | AMS QQ-P-416, TY II, CL 2 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.363 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5731 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OR AMS 5732 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OR AMS 5737 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OR AMS 5853 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN |
| Grip Diameter | 0.188 INCHES MINIMUM AND 0.189 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.258 INCHES MINIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| NAS1581C3H2P | Textron Aviation Inc (USA) |
| Reference | Meaning |
|---|---|
| NAS1581C3H2P | 5/9 Secondary reference Cessna Aircraft Company Dba Textron Aviation |
| NAS1581C3H2P | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-596-9640 is a Screw,close Tolerance, manufactured by Textron Aviation Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-596-9640 has 1 manufacturer part number on file: NAS1581C3H2P (Textron Aviation Inc).
Key specifications for NAS1581C3H2P: Fastener Length: 0.472 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN; Surface Treatment Document and Classification: AMS QQ-P-416, TY II, CL 2 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.363 INCHES NOMINAL IN; Material Document and Classification: AMS 5731 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OR AMS 5732 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OR AMS 5737 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OR AMS 5853 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL. 18 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.