The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-01-421-2028, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Aqua-Chem, Inc. Dba Aqua-Chem Inc. Government technical data includes 13 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-421-2028 |
| Primary Part Number | 868-08421-000 |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Aqua-Chem, Inc. Dba Aqua-Chem Inc |
| Status | ACTIVE |
| Head Height | 0.455 INCHES MINIMUM AND 0.483 INCHES MAXIMUM IN |
| Fastener Length | 3.500 INCHES NOMINAL IN |
| Thread Length | 1.750 INCHES NOMINAL IN |
| Material Document and Classification | ASTM B98 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.750 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 1.100 INCHES MINIMUM AND 1.299 INCHES MAXIMUM IN |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 10 |
| Material | COPPER ALLOY 661 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 |
|---|---|
| 868-08421-000 PRIMARY | Aqua-Chem, Inc. Dba Aqua-Chem Inc (USA) |
| Reference | Meaning |
|---|---|
| 868-8421 | 5/9 Secondary reference Aqua-Chem, Inc. Dba Aqua-Chem Inc |
| 868-8421 | 5/9 Secondary reference Aqua-Chem, Inc. |
| 649-D-7546 ITEM 7 | 3/9 Design control — primary reference Aqua-Chem, Inc. |
NSN 5305-01-421-2028 is a Screw,cap,hexagon Head, manufactured by Aqua-Chem, Inc. Dba Aqua-Chem Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-421-2028 has 1 manufacturer part number on file: 868-08421-000 (Aqua-Chem, Inc. Dba Aqua-Chem Inc).
Key specifications for 868-08421-000: Head Height: 0.455 INCHES MINIMUM AND 0.483 INCHES MAXIMUM IN; Fastener Length: 3.500 INCHES NOMINAL IN; Thread Length: 1.750 INCHES NOMINAL IN; Material Document and Classification: ASTM B98 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 13 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.