The Screw,shoulder, cataloged under National Stock Number 5305-01-585-8097, 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 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-585-8097 |
| Primary Part Number | ST3M653C6-19A |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.109 INCHES MINIMUM IN |
| Thread Length | 0.615 INCHES MINIMUM IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.756 INCHES MINIMUM 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 |
|---|---|
| HT4020-6-19AX | Huck International, Inc (USA) |
| HT4020-6-19AX | Howmet Global Fastening Systems Inc (USA) |
| HT4020-6-19AX | Hi-Shear Corporation (USA) |
| HT4020-6-19AX | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M653C6-19A PRIMARY | The Boeing Company Div Defense (USA) |
| WC4020-6-19AX | West Coast Aerospace, Inc. (USA) |
| ST3M653C6-19A | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| Reference | Meaning |
|---|---|
| HT4020-6-19AX | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-585-8097 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-585-8097 has 7 manufacturer part numbers on file: HT4020-6-19AX (Huck International, Inc), HT4020-6-19AX (Howmet Global Fastening Systems Inc), HT4020-6-19AX (Hi-Shear Corporation), HT4020-6-19AX (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M653C6-19A (The Boeing Company Div Defense) and 2 more.
Key specifications for ST3M653C6-19A: Head Height: 0.109 INCHES MINIMUM IN; Thread Length: 0.615 INCHES MINIMUM IN; Nominal Thread Diameter: 0.375 INCHES IN; Head Style: FLAT COUNTERSUNK UNDERCUT. 11 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.