The Screw,shoulder, cataloged under National Stock Number 5305-01-209-7945, 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-209-7945 |
| Primary Part Number | ST3M850V3-12AS |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.039 INCHES MINIMUM AND 0.041 INCHES MAXIMUM IN |
| Fastener Length | 1.140 INCHES MINIMUM AND 1.187 INCHES MAXIMUM IN |
| Shoulder Length | 0.699 INCHES MINIMUM AND 0.721 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.2021 INCHES MINIMUM AND 0.2026 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS4967,COMP 6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OVERALL V |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | TITANIUM ALLOY OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.376 INCHES MINIMUM AND 0.381 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 |
|---|---|
| HT4059V3-12AS | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4059V3-12AS | Hi-Shear Corporation (USA) |
| ST3M850V3-12AS PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M850V3-12AS | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| ST3M851V3-11AS | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4059V3-12AS | 5/9 Secondary reference U.S. Government activity |
| HT4059V3-12AS | 5/9 Secondary reference U.S. Government activity |
| HT4059V3-12AS | 5/2 Secondary reference U.S. Government activity |
| ST3M851V3-11AS | 5/9 Secondary reference U.S. Government activity |
| ST3M850V3-12AS | 5/9 Secondary reference U.S. Government activity |
| HT4059V3-12AS | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
NSN 5305-01-209-7945 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-209-7945 has 4 manufacturer part numbers on file: HT4059V3-12AS (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4059V3-12AS (Hi-Shear Corporation), ST3M850V3-12AS (The Boeing Company Div Defense), ST3M850V3-12AS (Sps Technologies, Llc Dba PB Fasteners).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-209-7946. Verify interchangeability with system specifications before substitution.
Key specifications for ST3M850V3-12AS: Head Height: 0.039 INCHES MINIMUM AND 0.041 INCHES MAXIMUM IN; Fastener Length: 1.140 INCHES MINIMUM AND 1.187 INCHES MAXIMUM IN; Shoulder Length: 0.699 INCHES MINIMUM AND 0.721 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.2021 INCHES MINIMUM AND 0.2026 INCHES MAXIMUM FIRST SHOULDER 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.