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212990-1 — RING ASSEMBLY,ELECTRICAL CONTACT

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

212990-1: RING ASSEMBLY,ELECTRICAL CONTACT.

RING ASSEMBLY,ELECTRICAL CONTACT. Key specifications include width: 0.203 INCHES NOMINAL IN, diameter: 3.610 INCHES NOMINAL IN, overall_length: 1.937 INCHES NOMINAL IN, overall_diameter: 3.750 INCHES NOMINAL IN, mounting_configuration: FOUR NO. 4-40 SCREWS ON 3.062 IN.

DIA CTR IN. This part is cataloged in the U.S. Government catalog under NSN 5977-00-026-7976, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
212990-1
NSN: 5977-00-026-7976
FSC: 5977 — Electrical Contact Brushes and Electrodes
CAGE: 03848 — ARMA DIV AMBAC INDUSTRIES INC
SPECIFICATIONS
width0.203 INCHES NOMINAL IN
diameter3.610 INCHES NOMINAL IN
brush_quantity8
overall_length1.937 INCHES NOMINAL IN
overall_diameter3.750 INCHES NOMINAL IN
brush_holder_quantity2
contact_ring_quantity4
mounting_configurationFOUR NO. 4-40 SCREWS ON 3.062 IN. DIA CTR IN
brush_quantity_accommodated_per_holder4
NSN5977-00-026-7976
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RING ASSEMBLY,ELECTRICAL CONTACT TITLE COMPONENT PN 212990-1 MFR RING ASSEMBLY,ELECTRIC
KEY FEATURES
•
BRUSH QUANTITY: 8
•
BRUSH HOLDER QUANTITY: 2
•
OVERALL DIAMETER: 3.750 INCHES NOMINAL IN
•
DIAMETER: 3.610 INCHES NOMINAL IN
•
BRUSH QUANTITY ACCOMMODATED PER HOLDER: 4
•
MOUNTING CONFIGURATION: FOUR NO. 4-40 SCREWS ON 3.062 IN. DIA CTR IN
•
WIDTH: 0.203 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
BRUSH QUANTITY8
BRUSH HOLDER QUANTITY2
OVERALL DIAMETER3.750 INCHES NOMINAL IN
DIAMETER3.610 INCHES NOMINAL IN
OVERALL LENGTH1.937 INCHES NOMINAL IN
BRUSH QUANTITY ACCOMMODATED PER HOLDER4
MOUNTING CONFIGURATIONFOUR NO. 4-40 SCREWS ON 3.062 IN. DIA CTR IN
WIDTH0.203 INCHES NOMINAL IN
CONTACT RING QUANTITY4
OTHER ITEMS IN FSC 5977 — Electrical Contact Brushes and Electrodes
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5977-00-001-8018 5977-00-001-8867 5977-00-002-9654 5977-00-003-0257 5977-00-003-0258 5977-00-003-0264 5977-00-003-1196 5977-00-003-1197
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 212990-1?
212990-1 is a RING ASSEMBLY,ELECTRICAL CONTACT.
What is the NSN for 212990-1?
212990-1 is cataloged in the U.S. Government catalog under NSN 5977-00-026-7976. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.