The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-577-4040, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Fluor Marine Propulsion, Llc Dba Knolls Atomic Power Laboratory. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-577-4040 |
| Primary Part Number | DS-20-101D-IT45 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Fluor Marine Propulsion, Llc Dba Knolls Atomic Power Laboratory |
| Status | ACTIVE |
| Width Across Flats | 0.312 INCHES NOMINAL IN |
| Head Height | 0.375 INCHES NOMINAL IN |
| Fastener Length | 1.000 INCHES NOMINAL IN |
| Thread Length | 1.000 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | ZINC OVERALL |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.562 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 |
|---|---|
| DS-20-101D-IT45 PRIMARY | Fluor Marine Propulsion, Llc Dba Knolls Atomic Power Laboratory (USA) |
| Reference | Meaning |
|---|---|
| DS-20-101D-IT45 | 5/1 Secondary reference Di Fillippo, R a Inc Dba Packaging Technology |
| 90128A624 | 3/1 Design control — primary reference Mcmaster-Carr Supply Co |
| DS-20-101D | D/9 Drawing number reference only Fluor Marine Propulsion, Llc Dba Knolls Atomic Power Laboratory |
NSN 5305-01-577-4040 is a Screw,cap,socket Head, manufactured by Fluor Marine Propulsion, Llc Dba Knolls Atomic Power Laboratory, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-577-4040 has 1 manufacturer part number on file: DS-20-101D-IT45 (Fluor Marine Propulsion, Llc Dba Knolls Atomic Power Laboratory).
Key specifications for DS-20-101D-IT45: Width Across Flats: 0.312 INCHES NOMINAL IN; Head Height: 0.375 INCHES NOMINAL IN; Fastener Length: 1.000 INCHES NOMINAL IN; Thread Length: 1.000 INCHES NOMINAL IN. 14 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.