The Standoff,threaded,spacing, cataloged under National Stock Number 5340-01-429-2431, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Accurate Screw Machine Corp Div Accurate Screw Machine Corporation. Government technical data includes 22 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5340-01-429-2431 |
| Primary Part Number | 14290-H-SS-1.000-12(B-1/4-20) |
| Item Name | Standoff,threaded,spacing |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Accurate Screw Machine Corp Div Accurate Screw Machine Corporation |
| Status | ACTIVE |
| Width Across Flats | 0.500 INCHES NOMINAL IN |
| Length | 1.000 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-F-14072 E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.375 INCHES MINIMUM LEFT INTERNAL (INCLUDES THRU THREAD) IN |
| Thread Length | 0.484 INCHES MINIMUM AND 0.516 INCHES MAXIMUM RIGHT EXTERNAL IN |
| Style Designator | LEFT INTERNAL AND RIGHT EXTERNAL THREAD |
| Material Document and Classification | QQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND RIGHT EXTERNAL |
| Thread Direction | RIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD) |
| Nominal Thread Size | 0.190 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN |
| Nominal Thread Size | 0.250 INCHES RIGHT EXTERNAL IN |
| Cross-Sectional Shape | HEXAGON |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 2A RIGHT EXTERNAL A |
| Thread Class | 2B LEFT INTERNAL (INCLUDES THRU THREAD) |
| Thread Quantity Per Inch | 32 LEFT INTERNAL (INCLUDES THRU THREAD) |
| Thread Quantity Per Inch | 20 RIGHT EXTERNAL |
| Material | STEEL COMP 303 OVERALL |
| Right Projection Diameter | 0.250 INCHES NOMINAL IN |
| Thread Series Designator | UNF LEFT INTERNAL (INCLUDES THRU THREAD) |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) RIGHT EXTERNAL |
| Right Projection Length | 0.484 INCHES MINIMUM AND 0.516 INCHES MAXIMUM 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 |
|---|---|
| 14290-H-SS-1.000-12(B-1/4-20) PRIMARY | Accurate Screw Machine Corp Div Accurate Screw Machine Corporation (USA) |
| Reference | Meaning |
|---|---|
| 91004V0024-1 | 7/2 Vendor item drawing reference Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service |
NSN 5340-01-429-2431 is a Standoff,threaded,spacing, manufactured by Accurate Screw Machine Corp Div Accurate Screw Machine Corporation, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-429-2431 has 1 manufacturer part number on file: 14290-H-SS-1.000-12(B-1/4-20) (Accurate Screw Machine Corp Div Accurate Screw Machine Corporation).
Key specifications for 14290-H-SS-1.000-12(B-1/4-20): Width Across Flats: 0.500 INCHES NOMINAL IN; Length: 1.000 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-F-14072 E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.375 INCHES MINIMUM LEFT INTERNAL (INCLUDES THRU THREAD) 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.