The Screw,shoulder, cataloged under National Stock Number 5305-01-145-9176, 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 7 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-145-9176 |
| Primary Part Number | ST3M506-4-51-1 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 3.570 INCHES MINIMUM AND 3.600 INCHES MAXIMUM IN |
| Shoulder Length | 3.114 INCHES MINIMUM AND 3.142 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 | 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 | 0.4208 INCHES MINIMUM AND 0.4258 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 |
|---|---|
| ST3M506-4-51-1 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M506-4-51-1 | Huck International, Inc (USA) |
| HT4016-4-51Y | Hi-Shear Corporation (USA) |
| HT4016-4-51Y | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M506-4-51-1 | Howmet Global Fastening Systems Inc (USA) |
| ST3M506-4-51-1 | West Coast Aerospace, Inc. (USA) |
| ST3M506-4-51-1 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| Reference | Meaning |
|---|---|
| HT4016-4-51Y | 5/2 Secondary reference U.S. Government activity |
| HT4016-4-51Y | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4016-4-51Y | 5/9 Secondary reference U.S. Government activity |
| HT4016-4-51Y | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-145-9176 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-145-9176 has 7 manufacturer part numbers on file: ST3M506-4-51-1 (The Boeing Company Div Defense), ST3M506-4-51-1 (Huck International, Inc), HT4016-4-51Y (Hi-Shear Corporation), HT4016-4-51Y (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M506-4-51-1 (Howmet Global Fastening Systems Inc) and 2 more.
Key specifications for ST3M506-4-51-1: Fastener Length: 3.570 INCHES MINIMUM AND 3.600 INCHES MAXIMUM IN; Shoulder Length: 3.114 INCHES MINIMUM AND 3.142 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.