The Screw,shoulder, cataloged under National Stock Number 5305-01-072-9143, 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 20 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-072-9143 |
| Primary Part Number | ST3M495-4-6-1 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.015 INCHES NOMINAL IN |
| Fastener Length | 0.875 INCHES MINIMUM AND 0.922 INCHES MAXIMUM IN |
| Shoulder Length | 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.264 INCHES MINIMUM AND 0.265 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.490 INCHES MINIMUM AND 0.557 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FILLISTER COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.390 INCHES MINIMUM AND 0.395 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 |
|---|---|
| HT4016-4-6X | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M495-4-6-1 PRIMARY | The Boeing Company Div Defense (USA) |
| 11911-4-6-1 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4016-4-6X | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4016-4-6X | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4016-4-6X | 5/9 Secondary reference U.S. Government activity |
| HT4016-4-6X | 3/2 Design control — primary reference U.S. Government activity |
| 10114955 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| HT4016-4-6X | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-072-9143 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-072-9143 has 4 manufacturer part numbers on file: HT4016-4-6X (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M495-4-6-1 (The Boeing Company Div Defense), 11911-4-6-1 (Reid Products Inc. Dba Reid Products Inc), HT4016-4-6X (Hi-Shear Corporation).
Key specifications for ST3M495-4-6-1: Head Height: 0.015 INCHES NOMINAL IN; Fastener Length: 0.875 INCHES MINIMUM AND 0.922 INCHES MAXIMUM IN; Shoulder Length: 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 20 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.