The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-01-556-2391, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Johnson Controls Navy Systems, Llc. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-556-2391 |
| Primary Part Number | 021-18085-000 |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Johnson Controls Navy Systems, Llc |
| Status | ACTIVE |
| Fastener Length | 3.500 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.750 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 10 |
| 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 |
|---|---|
| 021-18085-000 PRIMARY | Johnson Controls Navy Systems, Llc (USA) |
| Reference | Meaning |
|---|---|
| 477-15979-000 ITEM 95 | 5/1 Secondary reference Johnson Controls Navy Systems, Llc |
| 477-15979-000 | D/9 Drawing number reference only Johnson Controls Navy Systems, Llc |
NSN 5305-01-556-2391 is a Screw,cap,hexagon Head, manufactured by Johnson Controls Navy Systems, Llc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-556-2391 has 1 manufacturer part number on file: 021-18085-000 (Johnson Controls Navy Systems, Llc).
Key specifications for 021-18085-000: Fastener Length: 3.500 INCHES NOMINAL IN; Nominal Thread Diameter: 0.750 INCHES IN; Thread Direction: RIGHT-HAND; Thread Class: 3A A. 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.