The Standoff,threaded,spacing, cataloged under National Stock Number 5340-01-657-3697, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is W J Roberts Co Inc. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-657-3697 |
| Primary Part Number | 4C28H25AP/MF |
| Item Name | Standoff,threaded,spacing |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | W J Roberts Co Inc |
| Status | ACTIVE |
| Width Across Flats | 0.244 INCHES MINIMUM AND 0.256 INCHES MAXIMUM IN |
| Length | 0.27525 INCHES MINIMUM AND 0.28725 INCHES MAXIMUM IN |
| Thread Length | 0.25 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN |
| Style Designator | PROJECTION ONE END |
| Thread Direction | RIGHT-HAND RIGHT EXTERNAL |
| Thread Direction | RIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD) |
| Nominal Thread Size | 0.112 INCHES RIGHT EXTERNAL IN |
| Nominal Thread Size | 0.112 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN |
| Cross-Sectional Shape | HEXAGON |
| Thread Class | 2A RIGHT EXTERNAL A |
| Thread Class | 2B LEFT INTERNAL (INCLUDES THRU THREAD) |
| Thread Quantity Per Inch | 40 LEFT INTERNAL (INCLUDES THRU THREAD) |
| Thread Quantity Per Inch | 40 RIGHT EXTERNAL |
| Material | ALUMINUM OVERALL |
| Right Projection Diameter | 0.112 INCHES NOMINAL IN |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) LEFT INTERNAL (INCLUDES THRU THREAD) |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) RIGHT EXTERNAL |
| Right Projection Length | 0.1875 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 |
|---|---|
| 4C28H25AP/MF PRIMARY | W J Roberts Co Inc (USA) |
| 93505A476 | Mcmaster-Carr Supply Co (USA) |
NSN 5340-01-657-3697 is a Standoff,threaded,spacing, manufactured by W J Roberts Co Inc, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-657-3697 has 2 manufacturer part numbers on file: 4C28H25AP/MF (W J Roberts Co Inc), 93505A476 (Mcmaster-Carr Supply Co).
Key specifications for 4C28H25AP/MF: Width Across Flats: 0.244 INCHES MINIMUM AND 0.256 INCHES MAXIMUM IN; Length: 0.27525 INCHES MINIMUM AND 0.28725 INCHES MAXIMUM IN; Thread Length: 0.25 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN; Style Designator: PROJECTION ONE END. 18 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.