The Ring Assembly,electrical Contact, cataloged under National Stock Number 5977-00-504-5428, 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6 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5977-00-504-5428 |
| Item Name | Ring Assembly,electrical Contact |
| FSC / FSG | 5977 / 59 — Electrical Contact Brushes and Electrodes |
| Status | ACTIVE |
| Overall Diameter | 8.625 INCHES NOMINAL IN |
| Diameter | 8.188 INCHES NOMINAL AND 7.438 INCHES NOMINAL AND 6.688 INCHES NOMINAL AND 5.938 INCHES NOMINAL AND 5.188 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Surface Treatment | SILVER RING |
| Mounting Configuration | FOUR NO. 3 (0.213) DRILL,C-BORE; 0.359 IN. DIA HOLES FOR 10-24 FILLISTER HEAD SCREWS SPACED 90 DEG ON 4.250 IN. DIA BOLT CIRCLE IN |
| Width | 0.250 INCHES NOMINAL IN |
| Contact Ring Quantity | 5 |
| 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 |
|---|---|
| 50047-12 | 3/9 Design control — primary reference Arma Div Ambac Industries Inc |
NSN 5977-00-504-5428 is a Ring Assembly,electrical Contact, classified under FSC 5977, Electrical Contact Brushes and Electrodes. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6680-01-005-8018. Verify interchangeability with system specifications before substitution.
Key specifications for 5977-00-504-5428: Overall Height: 0.375 INCHES NOMINAL IN; Overall Diameter: 8.625 INCHES NOMINAL IN; Diameter: 8.188 INCHES NOMINAL AND 7.438 INCHES NOMINAL AND 6.688 INCHES NOMINAL AND 5.938 INCHES NOMINAL AND 5.188 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN; Surface Treatment: SILVER RING. 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.