The Screw,close Tolerance, cataloged under National Stock Number 5305-01-669-8331, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-669-8331 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Fastener Length | 3.676 INCHES MINIMUM AND 3.706 INCHES MAXIMUM IN |
| Thread Length | 0.316 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS1154 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Grip Length | 3.365 INCHES MINIMUM AND 3.385 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| 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 | TITANIUM ALLOY UNS R54520 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.449 INCHES MINIMUM AND 0.507 INCHES MAXIMUM 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 |
|---|---|
| NAS1154V51 | 5/9 Secondary reference Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| NAS1154V54 | 3/2 Design control — primary reference U.S. Government activity |
| NAS1154V54 | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
NSN 5305-01-669-8331 is a Screw,close Tolerance, classified under FSC 5305, Screws. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 5305-01-669-8367, 5305-01-669-9541, 5305-01-669-9607. Verify interchangeability with system specifications before substitution.
Key specifications for 5305-01-669-8331: Fastener Length: 3.676 INCHES MINIMUM AND 3.706 INCHES MAXIMUM IN; Thread Length: 0.316 INCHES NOMINAL IN; Nominal Thread Diameter: 0.250 INCHES IN; Head Style: FLAT COUNTERSUNK. 16 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.