The Standoff,threaded,spacing, cataloged under National Stock Number 5340-01-203-1957, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Captive Fasteners Corp. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-203-1957 |
| Primary Part Number | CFBS0S-6440-22 |
| Item Name | Standoff,threaded,spacing |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Captive Fasteners Corp |
| Status | ACTIVE |
| Flange Diameter | 0.250 INCHES NOMINAL IN |
| Length | 0.563 INCHES NOMINAL IN |
| Flange Thickness | 0.125 INCHES NOMINAL IN |
| Style Designator | FLANGED LEFT INTERNAL THREAD |
| Diameter | 0.212 INCHES MINIMUM IN |
| Cross-Sectional Shape | HEXAGON |
| 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 |
|---|---|
| CFBS0S-6440-22 PRIMARY | Captive Fasteners Corp (USA) |
| BSOS-6440-22 PRIMARY | Penn Engineering & Manufacturing Corp (USA) |
| Reference | Meaning |
|---|---|
| 58638-6 | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 5340-01-203-1957 is a Standoff,threaded,spacing, manufactured by Captive Fasteners Corp, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-203-1957 has 2 manufacturer part numbers on file: CFBS0S-6440-22 (Captive Fasteners Corp), BSOS-6440-22 (Penn Engineering & Manufacturing Corp).
2 possible matches (shared part number, not a government interchangeability claim): 1560-01-492-6404, 1560-01-492-6405. Verify interchangeability with system specifications before substitution.
Key specifications for CFBS0S-6440-22: Flange Diameter: 0.250 INCHES NOMINAL IN; Length: 0.563 INCHES NOMINAL IN; Flange Thickness: 0.125 INCHES NOMINAL IN; Style Designator: FLANGED LEFT INTERNAL THREAD. 6 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.