The Screw,close Tolerance, cataloged under National Stock Number 5305-01-734-2158, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 21 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-734-2158 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.111 INCHES NOMINAL IN |
| Point Length | 0.050 INCHES NOMINAL IN |
| Fastener Length | 1.20 INCHES MINIMUM AND 1.23 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | AMS2700 METHOD 1, CLASS 4 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Extended Washer Diameter | 0.325 INCHES NOMINAL IN |
| Thread Length | 0.403 INCHES NOMINAL IN |
| Material Document and Classification | AMS5731 OR AMS5732 OR AMS5737 OR AMS5853 AEROSPACE MATERIAL SPEC STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.2500 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS1580 NATIONAL STD/SPEC |
| Grip Length | 1.205 INCHES MINIMUM AND 1.225 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | OFFSET CRUCIFORM (TORQUE SET) |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.5066 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| NAS1580 | 3/1 Design control — primary reference U.S. Government activity |
| NAS1580C4R13 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-734-2158 is a Screw,close Tolerance, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-734-2158: Head Height: 0.111 INCHES NOMINAL IN; Point Length: 0.050 INCHES NOMINAL IN; Fastener Length: 1.20 INCHES MINIMUM AND 1.23 INCHES MAXIMUM IN; Surface Treatment Document and Classification: AMS2700 METHOD 1, CLASS 4 ASSN STD SINGLE TREATMENT RESPONSE OVERALL. 21 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.