The Screw,shoulder, cataloged under National Stock Number 5305-01-050-9678, 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 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-050-9678 |
| Primary Part Number | ST3M505-4-13 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.194 INCHES MINIMUM AND 1.224 INCHES MAXIMUM IN |
| Shoulder Length | 0.707 INCHES MINIMUM AND 0.727 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.2802 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.372 INCHES MINIMUM AND 0.422 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.497 INCHES MINIMUM AND 0.507 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 |
|---|---|
| HT4009-4-13 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M505-4-13 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4009-4-13 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| ST3M505-4-13 | Huck International, Inc (USA) |
| HT4009-4-13 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4009-4-13 | 5/9 Secondary reference U.S. Government activity |
| HT4009-4-13 | 5/2 Secondary reference U.S. Government activity |
| HT4009-4-13 | 5/9 Secondary reference U.S. Government activity |
| HT4009-4-13 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| ST3M505-4-13 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-050-9678 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-050-9678 has 5 manufacturer part numbers on file: HT4009-4-13 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M505-4-13 (The Boeing Company Div Defense), HT4009-4-13 (Howmet Global Fastening Systems Inc), ST3M505-4-13 (Huck International, Inc), HT4009-4-13 (Hi-Shear Corporation).
Key specifications for ST3M505-4-13: Fastener Length: 1.194 INCHES MINIMUM AND 1.224 INCHES MAXIMUM IN; Shoulder Length: 0.707 INCHES MINIMUM AND 0.727 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.2802 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM FIRST SHOULDER IN; Thread Length: 0.372 INCHES MINIMUM AND 0.422 INCHES MAXIMUM 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.