The Standoff,threaded,spacing, cataloged under National Stock Number 5340-00-328-8539, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier. Government technical data includes 13 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 | 5340-00-328-8539 |
| Primary Part Number | 255AS139-1 |
| Item Name | Standoff,threaded,spacing |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| Status | ACTIVE |
| Width Across Flats | 0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN |
| Length | 0.188 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-416, TYPE 2, CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| Groove Diameter | 0.140 INCHES NOMINAL IN |
| Thread Length | 0.188 INCHES NOMINAL RIGHT EXTERNAL IN |
| Style Designator | PROJECTION ONE END W/ RIGHT EXTERNAL THREAD |
| Material Document and Classification | MIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape | HEXAGON |
| Surface Treatment | CADMIUM OVERALL |
| Distance From End to Hole Center | 0.090 INCHES NOMINAL IN |
| Material | STEEL COMP 4130 OVERALL |
| Groove Width | 0.062 INCHES NOMINAL IN |
| Hole Quantity Perpendicular to Axis | 1 |
| 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 |
|---|---|
| 255AS139-1 PRIMARY | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
NSN 5340-00-328-8539 is a Standoff,threaded,spacing, manufactured by Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-328-8539 has 1 manufacturer part number on file: 255AS139-1 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier).
Key specifications for 255AS139-1: Width Across Flats: 0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN; Length: 0.188 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-416, TYPE 2, CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL; Groove Diameter: 0.140 INCHES NOMINAL IN. 13 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.