The Insulator,washer, cataloged under National Stock Number 5970-01-420-3385, 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 Naval Sea Systems Command. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5970-01-420-3385 |
| Primary Part Number | 556-6406596-MFBC-A24 |
| Item Name | Insulator,washer |
| FSC / FSG | 5970 / 59 — Electrical Insulators and Insulating Materials |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Material and Location | OVERALL PLASTIC, DELRIN ACETAL RESIN, E I DUPONT DE NEMOURS AND CO INC |
| Style Designator | ROUND, FLAT |
| Outside Diameter | 1.880 INCHES NOMINAL IN |
| Inside Diameter | 1.620 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 |
| Part Number | Manufacturer |
|---|---|
| 556-6406596-1033 | Naval Sea Systems Command (USA) |
| 556-6406596-MFBC-B24 | Naval Sea Systems Command (USA) |
| DF2300-4659-MFBC-A24 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 556-6406596-0033 | Naval Sea Systems Command (USA) |
| 218013569 | Naval Sea Systems Command (USA) |
| 556-6406596-MFBC-A24 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| C791-5601 | D/9 Drawing number reference only U.S. Government activity |
| C791-5601-MFBC-B24 | 5/2 Secondary reference U.S. Government activity |
| 6406596 | D/9 Drawing number reference only Naval Sea Systems Command |
| C791-5601-MFBC-A24 | 5/2 Secondary reference U.S. Government activity |
NSN 5970-01-420-3385 is a Insulator,washer, manufactured by Naval Sea Systems Command, classified under FSC 5970, Electrical Insulators and Insulating Materials. Status: active.
NSN 5970-01-420-3385 has 6 manufacturer part numbers on file: 556-6406596-1033 (Naval Sea Systems Command), 556-6406596-MFBC-B24 (Naval Sea Systems Command), DF2300-4659-MFBC-A24 (Huntington Ingalls Inc Div Newport News Shipbuilding), 556-6406596-0033 (Naval Sea Systems Command), 218013569 (Naval Sea Systems Command) and 1 more.
1 possible match (shared part number, not a government interchangeability claim): 5970-01-421-7251. Verify interchangeability with system specifications before substitution.
Key specifications for 556-6406596-MFBC-A24: Overall Height: 0.062 INCHES NOMINAL IN; Material and Location: OVERALL PLASTIC, DELRIN ACETAL RESIN, E I DUPONT DE NEMOURS AND CO INC; Style Designator: ROUND, FLAT; Outside Diameter: 1.880 INCHES NOMINAL IN. 4 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.