The Ring,frame Locking, cataloged under National Stock Number 4470-01-198-2991, is classified within Federal Supply Class 4470 (Nuclear Reactors) of the Furnace, Steam, Drying, Nuclear Reactors group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4470-01-198-2991 |
| Item Name | Ring,frame Locking |
| FSC / FSG | 4470 / 44 — Nuclear Reactors |
| Status | ACTIVE |
| General Characteristics Item Description | MATERIAL,STEEL,ASTM-A-7; 4.750 IN O/A DIA; 1.750 IN DIA CENTRALLY LOCATED THROUGH HOLE; 4 THROUGH HOLES 0.875 IN DIA WITH 3.250 IN COUNTERBORE 0.188 IN DEEP; 2 THROUGH HOLES 0.750 IN DIA SPACED 180.0 DEG APART IN |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL F — Mutilate — Cut |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | C |
| Reference | Meaning |
|---|---|
| 820-5348418 | 3/1 Design control — primary reference Naval Sea Systems Command |
| 820-5348417-3 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 4470-01-198-2991 is a Ring,frame Locking, classified under FSC 4470, Nuclear Reactors. Status: active.
Key specifications for 4470-01-198-2991: General Characteristics Item Description: MATERIAL,STEEL,ASTM-A-7; 4.750 IN O/A DIA; 1.750 IN DIA CENTRALLY LOCATED THROUGH HOLE; 4 THROUGH HOLES 0.875 IN DIA WITH 3.250 IN COUNTERBORE 0.188 IN DEEP; 2 THROUGH HOLES 0.750 IN DIA SPACED 180.0 DEG APART IN; Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS. 3 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.
NSN 4470-01-198-2991 has DEMIL Code F. 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.