The Screw,close Tolerance, cataloged under National Stock Number 5305-00-596-2584, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-596-2584 |
| Primary Part Number | ST3M454-4DL19 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.657 INCHES NOMINAL IN |
| Thread Length | 0.469 INCHES NOMINAL IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.188 INCHES NOMINAL IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.521 INCHES MINIMUM AND 1.561 INCHES MAXIMUM FIRST HOLE IN |
| Head Diameter | 0.497 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 |
| Part Number | Manufacturer |
|---|---|
| HT4025L4D19 | Satair A/s (DNK) |
| ST3M454-4DL19 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4025L4D19 | Hi-Shear Corporation (USA) |
| HT4025L4D19 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| HT4025L4D19 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 11905-4DL19 | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4025L4D19 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4025L4D19 | 5/9 Secondary reference U.S. Government activity |
| HT4025L4D19 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HT4025L4D19 | 5/9 Secondary reference U.S. Government activity |
| HT4025L4D19 | 5/2 Secondary reference U.S. Government activity |
| HT4025L4D19 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
NSN 5305-00-596-2584 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-596-2584 has 6 manufacturer part numbers on file: HT4025L4D19 (Satair A/s), ST3M454-4DL19 (The Boeing Company Div Defense), HT4025L4D19 (Hi-Shear Corporation), HT4025L4D19 (Fairchild Fasteners Europe - Vsd Gmbh), HT4025L4D19 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 1 more.
Key specifications for ST3M454-4DL19: Fastener Length: 1.657 INCHES NOMINAL IN; Thread Length: 0.469 INCHES NOMINAL IN; Shank Unthreaded Hole Diameter: 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN; Nominal Thread Diameter: 0.250 INCHES IN. 17 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.