The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-438-3450, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is W S Darley & Co. Government technical data includes 7 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-438-3450 |
| Primary Part Number | 5401400 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | W S Darley & Co |
| Status | ACTIVE |
| Fastener Length | 0.375 INCHES NOMINAL IN |
| Material Document and Classification | ASTM A167, 18-8SS ASSN STD 1ST MATERIAL RESPONSE OR ASTM A240, 18-8SS ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Internal Drive Style | HEXAGON |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| 5401400 PRIMARY | W S Darley & Co (USA) |
| Reference | Meaning |
|---|---|
| Z10100820033 | 5/9 Secondary reference W S Darley & Co |
| B229 REF NO 55 | 5/9 Secondary reference W S Darley & Co |
NSN 5305-01-438-3450 is a Screw,cap,socket Head, manufactured by W S Darley & Co, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-438-3450 has 1 manufacturer part number on file: 5401400 (W S Darley & Co).
Key specifications for 5401400: Fastener Length: 0.375 INCHES NOMINAL IN; Material Document and Classification: ASTM A167, 18-8SS ASSN STD 1ST MATERIAL RESPONSE OR ASTM A240, 18-8SS ASSN STD 2ND MATERIAL RESPONSE OVERALL; Nominal Thread Diameter: 0.250 INCHES IN; Internal Drive Style: HEXAGON. 7 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.