The Screw,cap,socket Head, cataloged under National Stock Number 5305-00-579-5518, is classified within Federal Supply Class 5305 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Triumph Engine Control Systems Llc. Government technical data includes 21 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-579-5518 |
| Primary Part Number | 44478 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — No Item Name Available |
| Manufacturer | Triumph Engine Control Systems Llc |
| Status | ACTIVE |
| Hole Quantity | 2 |
| Hole Type | DRILLED |
| Width Across Flats | 0.221 INCHES NOMINAL IN |
| Head Style | FLAT CHAMFER |
| Hole Configuration Style | ROUND LONGITUDINAL HOLE |
| Head Diameter | 0.438 INCHES NOMINAL IN |
| Thread Class | 3A A |
| Thread Direction | RIGHT-HAND |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Surface Treatment | CADMIUM OVERALL |
| Hardness Rating | 35.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| Material | STEEL COMP 8740 OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Thread Length | 2.875 INCHES MINIMUM IN |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Fastener Length | 2.906 INCHES MAXIMUM IN |
| Hole Diameter | 0.064 INCHES NOMINAL IN |
| Head Height | 0.312 INCHES NOMINAL IN |
| Thread Quantity Per Inch | 18 |
| Material Document and Classification | AMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 44478 PRIMARY | Triumph Engine Control Systems Llc (USA) |
NSN 5305-00-579-5518 is a Screw,cap,socket Head, manufactured by Triumph Engine Control Systems Llc, classified under FSC 5305 (No Item Name Available). Status: active.
NSN 5305-00-579-5518 has 1 cross-referenced part number: 44478 (Triumph Engine Control Systems Llc).
There are 2 known substitutes for 5305-00-579-5518: 3455-01-112-1083, 5306-01-557-6048. Verify interchangeability with system specifications before substitution.
Key specifications for 44478: Hole Quantity: 2; Hole Type: DRILLED; Width Across Flats: 0.221 INCHES NOMINAL IN; Head Style: FLAT CHAMFER. 21 total characteristics are documented in the Federal Logistics Information System.