The Screw,externally Relieved Body, cataloged under National Stock Number 5305-01-381-2108, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Marconi Communications Inc. Government technical data includes 17 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-381-2108 |
| Primary Part Number | H33-4021-50 |
| Item Name | Screw,externally Relieved Body |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Marconi Communications Inc |
| Status | ACTIVE |
| Head Height | 75.0 MILLIMETERS NOMINAL MM |
| External Thread Tolerance Class | 6G G |
| Fastener Length | 32.0 MILLIMETERS NOMINAL MM |
| Thread Pitch in Millimeters | 1.0 |
| Thread Length | 12.0 MILLIMETERS NOMINAL MM |
| Material Document and Classification | M-110/580/10BS970ENIA, CAGE U2248 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 4.5 MILLIMETERS NOMINAL MM |
| Nominal Thread Diameter | 6.0 MILLIMETERS MM |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 20.0 MILLIMETERS NOMINAL MM |
| Externally Relieved Body Diameter Quantity | 1 |
| Surface Treatment | CADMIUM OVERALL |
| Internal Drive Style | SLOT |
| Material | STEEL OVERALL |
| Thread Series Designator | M |
| Head Diameter | 9.0 MILLIMETERS NOMINAL MM |
| 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 |
|---|---|
| H33-4021-50 | Leonardo Mw Ltd (GBR) |
| H33-4021-50 PRIMARY | Marconi Communications Inc (USA) |
NSN 5305-01-381-2108 is a Screw,externally Relieved Body, manufactured by Marconi Communications Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-381-2108 has 2 manufacturer part numbers on file: H33-4021-50 (Leonardo Mw Ltd), H33-4021-50 (Marconi Communications Inc).
Key specifications for H33-4021-50: Head Height: 75.0 MILLIMETERS NOMINAL MM; External Thread Tolerance Class: 6G G; Fastener Length: 32.0 MILLIMETERS NOMINAL MM; Thread Pitch in Millimeters: 1.0. 17 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.