The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-121-0345, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Honeywell International, Inc Div Aerospace-Tucson. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-121-0345 |
| Primary Part Number | 321-1588268-24 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Honeywell International, Inc Div Aerospace-Tucson |
| Status | ACTIVE |
| Width Across Flats | 0.250 INCHES MINIMUM IN |
| Head Height | 0.250 INCHES MAXIMUM IN |
| Fastener Length | 1.470 INCHES MINIMUM AND 1.530 INCHES MAXIMUM IN |
| Thread Length | 0.940 INCHES MINIMUM AND 1.060 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| Hole Configuration Style | ROUND INTERNAL HEXAGON |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | WATERTIGHT |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL OVERALL |
| Hole Quantity | 2 |
| Thread Series Designator | UNF |
| Hole Type | DRILLED |
| Hole Diameter | 0.046 INCHES NOMINAL IN |
| Head Diameter | 0.427 INCHES MINIMUM AND 0.437 INCHES MAXIMUM 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 |
|---|---|
| 321-1588268-24 PRIMARY | Honeywell International, Inc Div Aerospace-Tucson (USA) |
| 321-1588268-24 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 321-1588268-24 | Honeywell International Inc. Dba Honeywell International (USA) |
| Reference | Meaning |
|---|---|
| 321-1588268-24 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-121-0345 is a Screw,cap,socket Head, manufactured by Honeywell International, Inc Div Aerospace-Tucson, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-121-0345 has 3 manufacturer part numbers on file: 321-1588268-24 (Honeywell International, Inc Div Aerospace-Tucson), 321-1588268-24 (Sps Technologies, Llc Dba PB Fasteners), 321-1588268-24 (Honeywell International Inc. Dba Honeywell International).
Key specifications for 321-1588268-24: Width Across Flats: 0.250 INCHES MINIMUM IN; Head Height: 0.250 INCHES MAXIMUM IN; Fastener Length: 1.470 INCHES MINIMUM AND 1.530 INCHES MAXIMUM IN; Thread Length: 0.940 INCHES MINIMUM AND 1.060 INCHES MAXIMUM IN. 20 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.