The Screw,shoulder, cataloged under National Stock Number 5305-01-141-7914, 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 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-141-7914 |
| Primary Part Number | ST3M495-4-51-1 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 3.569 INCHES MINIMUM AND 3.616 INCHES MAXIMUM IN |
| Shoulder Length | 3.130 INCHES MINIMUM AND 3.149 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.2646 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.371 INCHES MINIMUM AND 0.428 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 | OVAL 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 | 0.390 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 |
|---|---|
| ST3M495-4-51-1 | West Coast Aerospace, Inc. (USA) |
| 11911-4-51-1 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M495-4-51-1 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M495-4-51-1 | Howmet Global Fastening Systems Inc (USA) |
| HT4016-4-51X | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4016-4-51X | Hi-Shear Corporation (USA) |
| ST3M495-4-51-1 | Huck International, Inc (USA) |
| ST3M495-4-51-1 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| Reference | Meaning |
|---|---|
| HT4016-4-51X | 5/9 Secondary reference U.S. Government activity |
| HT4016-4-51X | 5/2 Secondary reference U.S. Government activity |
| HT4016-4-51X | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4016-4-51X | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-141-7914 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-141-7914 has 8 manufacturer part numbers on file: ST3M495-4-51-1 (West Coast Aerospace, Inc.), 11911-4-51-1 (Reid Products Inc. Dba Reid Products Inc), ST3M495-4-51-1 (The Boeing Company Div Defense), ST3M495-4-51-1 (Howmet Global Fastening Systems Inc), HT4016-4-51X (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 3 more.
Key specifications for ST3M495-4-51-1: Fastener Length: 3.569 INCHES MINIMUM AND 3.616 INCHES MAXIMUM IN; Shoulder Length: 3.130 INCHES MINIMUM AND 3.149 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.2646 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM FIRST SHOULDER IN; Thread Length: 0.371 INCHES MINIMUM AND 0.428 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.