The Screw,close Tolerance, cataloged under National Stock Number 5305-01-579-4846, 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 15 specifications, cited from the U.S. Government catalog. The record lists 16 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-579-4846 |
| Primary Part Number | ST3M557-6-9 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.203 INCHES NOMINAL IN |
| Thread Length | 0.641 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.562 INCHES NOMINAL IN |
| Grip Diameter | 0.374 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| 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 Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| ST3M557-6-9 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M557-6-9 | Linread Ltd (GBR) |
| ST3M557-6-9 | Huck International, Inc (USA) |
| ST3M557-6-9 | Houston Precision Fasteners I Lp (USA) |
| ST3M557-6-9 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M557-6-9 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M557-6-9 | Heartland Precision Fasteners Inc (USA) |
| ST3M557-6-9 | West Coast Aerospace, Inc. (USA) |
| ST3M557-6-9 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M557-6-9 | Saturn Fasteners Inc (USA) |
| ST3M557-6-9 | Howmet Global Fastening Systems Inc (USA) |
| ST3M557-6-9 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M557-6-9 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M557-6-9 | Camcar Llc Div Camcar Llc (USA) |
| ST3M557-6-9 | Hi-Shear Corporation (USA) |
| ST3M557-6-9 | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| 11923-6-9 | 5/9 Secondary reference Reid Products Inc. Dba Reid Products Inc |
| ST3M557-6-9 | 5/2 Secondary reference U.S. Government activity |
| HT4027-6-9 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| ST3M557-6-9 | 5/2 Secondary reference U.S. Government activity |
| HT4027-6-9 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| HT4027-6-9 | 5/9 Secondary reference Hi-Shear Corporation |
| HT4027-6-9 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
NSN 5305-01-579-4846 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-579-4846 has 16 manufacturer part numbers on file: ST3M557-6-9 (The Boeing Company Div Defense), ST3M557-6-9 (Linread Ltd), ST3M557-6-9 (Huck International, Inc), ST3M557-6-9 (Houston Precision Fasteners I Lp), ST3M557-6-9 (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 11 more.
Key specifications for ST3M557-6-9: Fastener Length: 1.203 INCHES NOMINAL IN; Thread Length: 0.641 INCHES NOMINAL IN; Nominal Thread Diameter: 0.375 INCHES IN; Head Style: FLAT COUNTERSUNK. 15 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.
NSN 5305-01-579-4846 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.