The Insulator,washer, cataloged under National Stock Number 5970-01-028-8929, 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 Reliance Mica Company, Inc.. Government technical data includes 4 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5970-01-028-8929 |
| Primary Part Number | RM546 |
| Item Name | Insulator,washer |
| FSC / FSG | 5970 / 59 — Electrical Insulators and Insulating Materials |
| Manufacturer | Reliance Mica Company, Inc. |
| Status | ACTIVE |
| Style Designator | ROUND, FLAT |
| Outside Diameter | 0.625 INCHES NOMINAL IN |
| Inside Diameter | 0.192 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN |
| Material | MICA OVERALL |
| 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 |
|---|---|
| 2922381 | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| RM546 PRIMARY | Reliance Mica Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 562711 | 7/2 Vendor item drawing reference Lockheed Martin Corporation Div Rms - Mitchel Field |
| WD264 | 5/9 Secondary reference U.S. Government activity |
NSN 5970-01-028-8929 is a Insulator,washer, manufactured by Reliance Mica Company, Inc., classified under FSC 5970, Electrical Insulators and Insulating Materials. Status: active.
NSN 5970-01-028-8929 has 2 manufacturer part numbers on file: 2922381 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), RM546 (Reliance Mica Company, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5970-01-188-2791. Verify interchangeability with system specifications before substitution.
Key specifications for RM546: Overall Height: 0.005 INCHES NOMINAL IN; Style Designator: ROUND, FLAT; Outside Diameter: 0.625 INCHES NOMINAL IN; Inside Diameter: 0.192 INCHES MINIMUM AND 0.200 INCHES MAXIMUM 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.