The Screw,shoulder, cataloged under National Stock Number 5305-01-084-4683, 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 19 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-084-4683 |
| Primary Part Number | ST3M505-3-18 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.067 INCHES NOMINAL IN |
| Fastener Length | 1.441 INCHES MINIMUM AND 1.471 INCHES MAXIMUM IN |
| Shoulder Length | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.2177 INCHES NOMINAL AND 0.2182 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.306 INCHES MINIMUM AND 0.355 INCHES MAXIMUM 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 | 0.338 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 |
|---|---|
| 11917-3-18 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4009-3-18 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4009-3-18 | Hi-Shear Corporation (USA) |
| ST3M505-3-18 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| HT4009-3-18 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| HT4009-3-18 | 5/9 Secondary reference U.S. Government activity |
| HT4009-3-18 | 5/2 Secondary reference U.S. Government activity |
| HT4009-3-18 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4009-3-18 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HT4009-3-18 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-084-4683 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-084-4683 has 4 manufacturer part numbers on file: 11917-3-18 (Reid Products Inc. Dba Reid Products Inc), HT4009-3-18 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4009-3-18 (Hi-Shear Corporation), ST3M505-3-18 (The Boeing Company Div Defense).
Key specifications for ST3M505-3-18: Head Height: 0.067 INCHES NOMINAL IN; Fastener Length: 1.441 INCHES MINIMUM AND 1.471 INCHES MAXIMUM IN; Shoulder Length: 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 19 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.