The Screw,shoulder, cataloged under National Stock Number 5305-01-045-9639, 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 7 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-045-9639 |
| Primary Part Number | ST3M505-3-3 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 0.503 INCHES MINIMUM AND 0.550 INCHES MAXIMUM IN |
| Shoulder Length | 0.0448 INCHES MINIMUM AND 0.0474 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.331 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE 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 COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| ST3M505-3-3 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M505-3-3 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M505-3-3 | West Coast Aerospace, Inc. (USA) |
| HT4009-3-3 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4009-3-3 | Huck International, Inc (USA) |
| HT4009-3-3 | Hi-Shear Corporation (USA) |
| WC4009-3-3 | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| HT4009-3-3 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4009-3-3 | 5/2 Secondary reference U.S. Government activity |
| HT4009-3-3 | 5/9 Secondary reference U.S. Government activity |
| HT4009-3-3 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| HT4009-3-3 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-045-9639 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-045-9639 has 7 manufacturer part numbers on file: ST3M505-3-3 (The Boeing Company Div Defense), ST3M505-3-3 (Fastener Innovation Technology, Inc. Dba F I T), ST3M505-3-3 (West Coast Aerospace, Inc.), HT4009-3-3 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4009-3-3 (Huck International, Inc) and 2 more.
1 possible match (shared part number, not a government interchangeability claim): 5305-01-202-1544. Verify interchangeability with system specifications before substitution.
Key specifications for ST3M505-3-3: Fastener Length: 0.503 INCHES MINIMUM AND 0.550 INCHES MAXIMUM IN; Shoulder Length: 0.0448 INCHES MINIMUM AND 0.0474 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.331 INCHES NOMINAL 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.