The Screw,shoulder, cataloged under National Stock Number 5305-00-797-9640, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is L3 Technologies, Inc. Div L3 Keo. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-797-9640 |
| Primary Part Number | A559-40 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | L3 Technologies, Inc. Div L3 Keo |
| Status | ACTIVE |
| Head Height | 0.063 INCHES NOMINAL IN |
| Fastener Length | 0.312 INCHES NOMINAL IN |
| Shoulder Length | 0.109 INCHES NOMINAL FIRST SHOULDER IN |
| Shoulder Diameter | 0.271 INCHES MINIMUM AND 0.281 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.172 INCHES MINIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Nominal Thread Diameter | 0.112 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | SLOT |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 40 |
| Material | STEEL COMP 303 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.375 INCHES NOMINAL 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 |
|---|---|
| A559-40 PRIMARY | L3 Technologies, Inc. Div L3 Keo (USA) |
| F559-5ITEM20 | L3 Technologies, Inc. Div L3 Keo (USA) |
NSN 5305-00-797-9640 is a Screw,shoulder, manufactured by L3 Technologies, Inc. Div L3 Keo, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-797-9640 has 2 manufacturer part numbers on file: A559-40 (L3 Technologies, Inc. Div L3 Keo), F559-5ITEM20 (L3 Technologies, Inc. Div L3 Keo).
Key specifications for A559-40: Head Height: 0.063 INCHES NOMINAL IN; Fastener Length: 0.312 INCHES NOMINAL IN; Shoulder Length: 0.109 INCHES NOMINAL FIRST SHOULDER IN; Shoulder Diameter: 0.271 INCHES MINIMUM AND 0.281 INCHES MAXIMUM FIRST SHOULDER IN. 16 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.