The Standoff,threaded,spacing, cataloged under National Stock Number 5340-01-666-4571, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is General Atomics Dba General Atomics Corp. Government technical data includes 9 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. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-666-4571 |
| Primary Part Number | 3400D1421998 |
| Item Name | Standoff,threaded,spacing |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | General Atomics Dba General Atomics Corp |
| Status | ACTIVE |
| Length | 1.920 INCHES NOMINAL IN |
| Thread Length | 1.0 INCHES NOMINAL RIGHT EXTERNAL IN |
| Nominal Thread Size | 6.0 MILLIMETERS RIGHT EXTERNAL MM |
| Nominal Thread Size | 0.375 INCHES LEFT EXTERNAL IN |
| Thread Quantity Per Inch | 16 LEFT EXTERNAL |
| Right Projection Diameter | 0.375 INCHES NOMINAL IN |
| Thread Series Designator | M RIGHT EXTERNAL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) LEFT EXTERNAL |
| Right Projection Length | 0.38 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Unit of Issue | EA |
| Part Number | Manufacturer |
|---|---|
| 3400D1421998 PRIMARY | General Atomics Dba General Atomics Corp (USA) |
NSN 5340-01-666-4571 is a Standoff,threaded,spacing, manufactured by General Atomics Dba General Atomics Corp, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-666-4571 has 1 manufacturer part number on file: 3400D1421998 (General Atomics Dba General Atomics Corp).
Key specifications for 3400D1421998: Length: 1.920 INCHES NOMINAL IN; Thread Length: 1.0 INCHES NOMINAL RIGHT EXTERNAL IN; Nominal Thread Size: 6.0 MILLIMETERS RIGHT EXTERNAL MM; Nominal Thread Size: 0.375 INCHES LEFT EXTERNAL IN. 9 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.