The Setscrew, cataloged under National Stock Number 5305-01-063-6418, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-063-6418 |
| Primary Part Number | 4052144 |
| Item Name | Setscrew |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Width Across Flats | 0.062 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN |
| Fastener Length | 0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN |
| Thread Length | 0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN |
| Hole Configuration Style | ROUND |
| Nominal Thread Diameter | 0.138 INCHES IN |
| Head Style | HEADLESS (SETSCREW) |
| Thread Direction | RIGHT-HAND |
| Point Style | OVAL |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 40 |
| Hole Quantity | 1 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hole Type | DRILLED |
| Hole Diameter | 0.047 INCHES NOMINAL 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 |
|---|---|
| 4052144 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 4052144 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| 4052144 | 5/9 Secondary reference Now Corp Modern Mfg Div |
| 4052144 | 5/9 Secondary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
NSN 5305-01-063-6418 is a Setscrew, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-063-6418 has 2 manufacturer part numbers on file: 4052144 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 4052144 (Sps Technologies, Llc Dba PB Fasteners).
1 possible match (shared part number, not a government interchangeability claim): 4240-01-250-2985. Verify interchangeability with system specifications before substitution.
Key specifications for 4052144: Width Across Flats: 0.062 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN; Fastener Length: 0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN; Thread Length: 0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN; Hole Configuration Style: ROUND. 15 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.