The Ring Tools, cataloged under National Stock Number 4920-01-663-8505, is classified within Federal Supply Class 4920 (Aircraft Maintenance and Repair Shop Specialized Equipment) of the Maintenance and Repair Shop Equipment group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4920-01-663-8505 |
| Item Name | Ring Tools |
| FSC / FSG | 4920 / 49 — Aircraft Maintenance and Repair Shop Specialized Equipment |
| Status | ACTIVE |
| Overall Diameter | 1.35 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| SKB23193-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4920-01-663-8505 is a Ring Tools, classified under FSC 4920, Aircraft Maintenance and Repair Shop Specialized Equipment. Status: active.
Key specifications for 4920-01-663-8505: Overall Diameter: 1.35 INCHES NOMINAL IN; Overall Length: 1.5 INCHES NOMINAL IN; Special Features: USED TO INSTALL PISTON (WITH INSTALLED SEALS) INTO BODY ASSEMBLY OF START VALVE;NEXT HIGHER ASSY APU ACCUMULATOR/START VALVE MODULE; Part Name Assigned by Controlling Agency: MODULE GUIDE,APU. 1 specification is 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.
NSN 4920-01-663-8505 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.