The Ring Assembly,electrical Contact, cataloged under National Stock Number 5977-00-503-9487, is classified within Federal Supply Class 5977 (Electrical Contact Brushes and Electrodes) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Lockheed Martin Corporation Div Rms - Mitchel Field. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5977-00-503-9487 |
| Primary Part Number | 201822 |
| Item Name | Ring Assembly,electrical Contact |
| FSC / FSG | 5977 / 59 — Electrical Contact Brushes and Electrodes |
| Manufacturer | Lockheed Martin Corporation Div Rms - Mitchel Field |
| Status | ACTIVE |
| FSC Application Data | COMPASS,GYRO |
| Overall Diameter | 4.156 INCHES NOMINAL IN |
| Diameter | 3.188 INCHES NOMINAL IN |
| Mounting Configuration | THREE 0.156 IN. DIA MTG HOLES,COUNTERSUNK TO 0.250 IN. DIA,SPACED 120 DEG APART ON A 3.750 IN. BOLT CIRCLE IN |
| Width | 0.219 INCHES NOMINAL IN |
| Contact Ring Quantity | 6 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 201822 PRIMARY | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
| Reference | Meaning |
|---|---|
| 201822 | 5/9 Secondary reference Gyro Systems Co Inc |
NSN 5977-00-503-9487 is a Ring Assembly,electrical Contact, manufactured by Lockheed Martin Corporation Div Rms - Mitchel Field, classified under FSC 5977, Electrical Contact Brushes and Electrodes. Status: active.
NSN 5977-00-503-9487 has 1 manufacturer part number on file: 201822 (Lockheed Martin Corporation Div Rms - Mitchel Field).
1 possible match (shared part number, not a government interchangeability claim): 6240-00-958-6632. Verify interchangeability with system specifications before substitution.
Key specifications for 201822: FSC Application Data: COMPASS,GYRO; Overall Diameter: 4.156 INCHES NOMINAL IN; Diameter: 3.188 INCHES NOMINAL IN; Overall Length: 2.156 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.