The Screw,close Tolerance, cataloged under National Stock Number 5305-01-177-1806, 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 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-177-1806 |
| Primary Part Number | ST3M562-3-4 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 0.470 INCHES MINIMUM AND 0.517 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MAC P.S. 13145,FSCM 76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.210 INCHES MINIMUM AND 0.277 INCHES MAXIMUM IN |
| Material Document and Classification | 23-105,FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN |
| Grip Diameter | 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM 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 | 32 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.376 INCHES MINIMUM AND 0.385 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 |
|---|---|
| ST3M562-3-4 PRIMARY | The Boeing Company Div Defense (USA) |
| HT309-3-4 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| BM19031-3-4 PRIMARY | Huck International, Inc (USA) |
| HT309-3-4 PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| BM19031-3-4 | 5/9 Secondary reference U.S. Government activity |
| 73991H-3-4 | 3/2 Design control — primary reference U.S. Government activity |
| HT8177-3-4 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-177-1806 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-177-1806 has 4 manufacturer part numbers on file: ST3M562-3-4 (The Boeing Company Div Defense), HT309-3-4 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), BM19031-3-4 (Huck International, Inc), HT309-3-4 (Hi-Shear Corporation).
Key specifications for ST3M562-3-4: Fastener Length: 0.470 INCHES MINIMUM AND 0.517 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MAC P.S. 13145,FSCM 76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.210 INCHES MINIMUM AND 0.277 INCHES MAXIMUM IN; Material Document and Classification: 23-105,FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL. 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.