The Screw,close Tolerance, cataloged under National Stock Number 5305-01-589-0674, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-589-0674 |
| Primary Part Number | HT4027-6 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| Status | ACTIVE |
| Head Height | 0.081 INCHES NOMINAL IN |
| Fastener Length | 0.641 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | AMS 2700 METHOD 1 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.626 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5662 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Nominal Thread Diameter | 0.373 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.375 INCHES NOMINAL IN |
| Grip Diameter | 0.374 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.564 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 |
| Part Number | Manufacturer |
|---|---|
| HT4027-6 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M557-6-6 PRIMARY | The Boeing Company Div Defense (USA) |
| W04027-6-6 | West Coast Aerospace, Inc. (USA) |
NSN 5305-01-589-0674 is a Screw,close Tolerance, manufactured by Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-589-0674 has 3 manufacturer part numbers on file: HT4027-6 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), ST3M557-6-6 (The Boeing Company Div Defense), W04027-6-6 (West Coast Aerospace, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-591-0368. Verify interchangeability with system specifications before substitution.
Key specifications for HT4027-6: Head Height: 0.081 INCHES NOMINAL IN; Fastener Length: 0.641 INCHES NOMINAL IN; Surface Treatment Document and Classification: AMS 2700 METHOD 1 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.626 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN. 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.