The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-045-6653, 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 13 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-045-6653 |
| Primary Part Number | ST3M506-4-12-1 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.0150 INCHES NOMINAL IN |
| Fastener Length | 1.1310 INCHES MINIMUM AND 1.1780 INCHES MAXIMUM IN |
| Thread Length | 0.3970 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.2500 INCHES IN |
| Head Style | FILLISTER 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 CORROSION RESISTING 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 |
|---|---|
| HT4016-4-12Y | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4016-4-12Y | Hi-Shear Corporation (USA) |
| ST3M506-4-12-1 | West Coast Aerospace, Inc. (USA) |
| ST3M506-4-12-1 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M506-4-12-1 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4016-4-12Y | Huck International, Inc (USA) |
| ST3M506-4-12-1 | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4016-4-12Y | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| HT4016-4-12Y | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4016-4-12Y | 5/2 Secondary reference U.S. Government activity |
| HT4016-4-12Y | 5/9 Secondary reference U.S. Government activity |
| HT4016-4-12Y | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-045-6653 is a Screw,cap,socket Head, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-045-6653 has 7 manufacturer part numbers on file: HT4016-4-12Y (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4016-4-12Y (Hi-Shear Corporation), ST3M506-4-12-1 (West Coast Aerospace, Inc.), ST3M506-4-12-1 (Fastener Innovation Technology, Inc. Dba F I T), ST3M506-4-12-1 (The Boeing Company Div Defense) and 2 more.
Key specifications for ST3M506-4-12-1: Head Height: 0.0150 INCHES NOMINAL IN; Fastener Length: 1.1310 INCHES MINIMUM AND 1.1780 INCHES MAXIMUM IN; Thread Length: 0.3970 INCHES NOMINAL IN; Nominal Thread Diameter: 0.2500 INCHES IN. 13 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.