The Screw,close Tolerance, cataloged under National Stock Number 5305-01-588-1747, 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 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-588-1747 |
| Primary Part Number | HT4027-4-24 |
| 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 | 0.015 INCHES MAXIMUM IN |
| Fastener Length | 1.969 INCHES NOMINAL IN |
| Thread Length | 0.469 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.2500 INCHES IN |
| Head Style | FILLISTER COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.5 INCHES NOMINAL IN |
| Grip Diameter | 0.25 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 | 28.0 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.3898 INCHES MINIMUM AND 0.3948 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 |
| Part Number | Manufacturer |
|---|---|
| HT4027-4-24 | Howmet Global Fastening Systems Inc (USA) |
| HT4027-4-24 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HT4027-4-24 | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| ST3M557-4-24 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5305-01-588-1747 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 5305-01-588-1747 has 3 manufacturer part numbers on file: HT4027-4-24 (Howmet Global Fastening Systems Inc), HT4027-4-24 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), HT4027-4-24 (Huck International, Inc).
Key specifications for HT4027-4-24: Head Height: 0.015 INCHES MAXIMUM IN; Fastener Length: 1.969 INCHES NOMINAL IN; Thread Length: 0.469 INCHES NOMINAL IN; Nominal Thread Diameter: 0.2500 INCHES IN. 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.