The Standoff,threaded,spacing, cataloged under National Stock Number 5340-01-491-9987, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-491-9987 |
| Item Name | Standoff,threaded,spacing |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| Style Designator | LEFT INTERNAL AND RIGHT EXTERNAL THREAD |
| Diameter | 1.000 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD) |
| Nominal Thread Size | 0.375 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN |
| Cross-Sectional Shape | ROUND |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 2B LEFT INTERNAL (INCLUDES THRU THREAD) |
| Thread Quantity Per Inch | 16 LEFT INTERNAL (INCLUDES THRU THREAD) |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) LEFT INTERNAL (INCLUDES THRU THREAD) |
| 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 |
|---|---|
| 2101745 | D/9 Drawing number reference only U.S. Government activity |
| 2101745-04-500 | 3/2 Design control — primary reference U.S. Government activity |
| 2102190 ITEM 2101745-04-500 | 5/2 Secondary reference U.S. Government activity |
NSN 5340-01-491-9987 is a Standoff,threaded,spacing, classified under FSC 5340, Hardware, Commercial. Status: active.
Key specifications for 5340-01-491-9987: Style Designator: LEFT INTERNAL AND RIGHT EXTERNAL THREAD; Diameter: 1.000 INCHES NOMINAL IN; Thread Direction: RIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD); Nominal Thread Size: 0.375 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN. 10 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.