The Screw,shoulder, cataloged under National Stock Number 5305-01-567-7889, 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 16 specifications, cited from the U.S. Government catalog. The record lists 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-567-7889 |
| Primary Part Number | ST3M496-6-21 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.828 INCHES NOMINAL IN |
| Shoulder Length | 0.988 INCHES MINIMUM AND 1.008 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.389 INCHES MINIMUM AND 0.390 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.516 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.752 INCHES MINIMUM AND 0.762 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 |
|---|---|
| ST3M496-6-21 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M496-6-21 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4008-6-21 | Howmet Global Fastening Systems Inc (USA) |
| 11913-6-21 | Reid Products Inc. Dba Reid Products Inc (USA) |
| WC4008-6-21 | West Coast Aerospace, Inc. (USA) |
| HT4008-6-21 | Hi-Shear Corporation (USA) |
| HT4008-6-21 | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4008-6-21 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-567-7889 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-567-7889 has 7 manufacturer part numbers on file: ST3M496-6-21 (The Boeing Company Div Defense), ST3M496-6-21 (Fastener Innovation Technology, Inc. Dba F I T), HT4008-6-21 (Howmet Global Fastening Systems Inc), 11913-6-21 (Reid Products Inc. Dba Reid Products Inc), WC4008-6-21 (West Coast Aerospace, Inc.) and 2 more.
Key specifications for ST3M496-6-21: Fastener Length: 1.828 INCHES NOMINAL IN; Shoulder Length: 0.988 INCHES MINIMUM AND 1.008 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.389 INCHES MINIMUM AND 0.390 INCHES MAXIMUM FIRST SHOULDER IN; Thread Length: 0.516 INCHES NOMINAL 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.