The Standoff,threaded,spacing, cataloged under National Stock Number 5340-01-421-7840, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. Government technical data includes 22 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-421-7840 |
| Item Name | Standoff,threaded,spacing |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| Width Across Flats | 0.2500 INCHES NOMINAL IN |
| Length | 0.3125 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-A-5541 MIL SPEC SINGLE TREATMENT RESPONSE STANDOFF |
| Thread Length | 0.3750 INCHES NOMINAL RIGHT INTERNAL IN |
| Thread Length | 0.2500 INCHES NOMINAL LEFT EXTERNAL IN |
| Style Designator | LEFT INTERNAL AND RIGHT EXTERNAL THREAD |
| Material Document and Classification | QQ-A-225/3 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-225/8 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-200/9 FED SPEC SINGLE MATERIAL RESPONSE STANDOFF |
| Thread Direction | RIGHT-HAND RIGHT INTERNAL |
| Thread Direction | RIGHT-HAND LEFT EXTERNAL |
| Nominal Thread Size | 0.1380 INCHES RIGHT INTERNAL IN |
| Nominal Thread Size | 0.1380 INCHES LEFT EXTERNAL IN |
| Cross-Sectional Shape | HEXAGON |
| Surface Treatment | CHROMATE STANDOFF |
| Thread Class | 2A LEFT EXTERNAL A |
| Thread Class | 2B RIGHT INTERNAL |
| Thread Quantity Per Inch | 32 RIGHT INTERNAL |
| Thread Quantity Per Inch | 32 LEFT EXTERNAL |
| Material | ALUMINUM ALLOY 2011 OR ALUMINUM ALLOY 6061 OR ALUMINUM ALLOY 6063 STANDOFF |
| Right Projection Diameter | 0.1380 INCHES NOMINAL IN |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) RIGHT INTERNAL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) LEFT EXTERNAL |
| Right Projection Length | 0.2500 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 |
| Reference | Meaning |
|---|---|
| 4531-632-A-6 | 3/9 Design control — primary reference Matthew Warren, Inc Dba Raf Electronic Hardware Div Raf Electronic Hardware, Llc |
NSN 5340-01-421-7840 is a Standoff,threaded,spacing, classified under FSC 5340, Hardware, Commercial. Status: active.
Key specifications for 5340-01-421-7840: Width Across Flats: 0.2500 INCHES NOMINAL IN; Length: 0.3125 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-A-5541 MIL SPEC SINGLE TREATMENT RESPONSE STANDOFF; Thread Length: 0.3750 INCHES NOMINAL RIGHT INTERNAL IN. 22 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.