The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-421-2033, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 15 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-421-2033 |
| Primary Part Number | 801-6508779-28 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Width Across Flats | 0.625 INCHES NOMINAL IN |
| Head Height | 0.740 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN |
| Fastener Length | 2.250 INCHES NOMINAL IN |
| Thread Length | 2.250 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.750 INCHES IN |
| Head Style | FLAT FILLISTER |
| Thread Direction | RIGHT-HAND |
| Locking Feature | PATCH OR PELLET OR STRIP THREADS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 10 |
| Material | PLASTIC POLYAMIDE NYLON LOCKING FEATURE |
| Material | NICKEL ALLOY K-500 OVERALL |
| Thread Series Designator | UNRC |
| Head Diameter | 1.107 INCHES MINIMUM AND 1.125 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 |
|---|---|
| 801-6508779-28 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 0.750-10UNRC-3AX2.250L STEEL | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 751-640232 FIND 63 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 751-6402301 ITEM 63 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 581-6726890-47 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 801-6408775-25 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 801-6408779-28 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 211070355 | 5/9 Secondary reference Naval Sea Systems Command |
NSN 5305-01-421-2033 is a Screw,cap,socket Head, manufactured by Naval Sea Systems Command, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-421-2033 has 1 manufacturer part number on file: 801-6508779-28 (Naval Sea Systems Command).
Key specifications for 801-6508779-28: Width Across Flats: 0.625 INCHES NOMINAL IN; Head Height: 0.740 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN; Fastener Length: 2.250 INCHES NOMINAL IN; Thread Length: 2.250 INCHES NOMINAL IN. 15 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.