The Ring,electrical Contact, cataloged under National Stock Number 5977-00-438-9982, is classified within Federal Supply Class 5977 (Electrical Contact Brushes and Electrodes) of the Electrical and Electronic Equipment Components group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5977-00-438-9982 |
| Item Name | Ring,electrical Contact |
| FSC / FSG | 5977 / 59 — Electrical Contact Brushes and Electrodes |
| Status | ACTIVE |
| Overall Diameter | 0.640 INCHES NOMINAL IN |
| Shape | CYLINDRICAL |
| Outside Diameter | 0.640 INCHES NOMINAL IN |
| Inside Diameter | 0.375 INCHES NOMINAL IN |
| Surface Treatment | GOLD |
| Material | SILVER |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 277659 | 3/2 Design control — primary reference U.S. Government activity |
| 277659 | 1/2 Source control — Government-approved source U.S. Government activity |
| 277659 | 5/9 Secondary reference Kidde-Fenwal, Llc |
NSN 5977-00-438-9982 is a Ring,electrical Contact, classified under FSC 5977, Electrical Contact Brushes and Electrodes. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5895-01-344-2586. Verify interchangeability with system specifications before substitution.
Key specifications for 5977-00-438-9982: Overall Diameter: 0.640 INCHES NOMINAL IN; Shape: CYLINDRICAL; Overall Length: 0.620 INCHES NOMINAL IN; Outside Diameter: 0.640 INCHES NOMINAL IN. 6 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.