The Insulator,bushing, cataloged under National Stock Number 5970-01-269-0323, is classified within Federal Supply Class 5970 (Electrical Insulators and Insulating Materials) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Ucar Carbon Co Inc. Government technical data includes 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5970-01-269-0323 |
| Primary Part Number | ST21D19-4 |
| Item Name | Insulator,bushing |
| FSC / FSG | 5970 / 59 — Electrical Insulators and Insulating Materials |
| Manufacturer | Ucar Carbon Co Inc |
| Status | ACTIVE |
| Shank Height | 0.020 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN |
| Outside Diameter | 0.875 INCHES NOMINAL IN |
| Shank Outside Diameter | 0.370 INCHES NOMINAL IN |
| Inside Diameter | 0.320 INCHES NOMINAL IN |
| Unable to Decode | UNABLE TO DECODE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| ST21D19-4 | Ucar Carbon Co Inc (USA) |
| Reference | Meaning |
|---|---|
| ST21D19 | 5/9 Secondary reference Lockheed Martin Corp |
| ST21D19-4 | 3/9 Design control — primary reference Lockheed Martin Corp |
NSN 5970-01-269-0323 is a Insulator,bushing, manufactured by Ucar Carbon Co Inc, classified under FSC 5970, Electrical Insulators and Insulating Materials. Status: active.
NSN 5970-01-269-0323 has 1 manufacturer part number on file: ST21D19-4 (Ucar Carbon Co Inc).
Key specifications for ST21D19-4: Overall Height: 0.050 INCHES NOMINAL IN; Shank Height: 0.020 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN; Outside Diameter: 0.875 INCHES NOMINAL IN; Shank Outside Diameter: 0.370 INCHES NOMINAL IN. 5 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.