The Seal Ring,nuclear Coolant System, cataloged under National Stock Number 4470-00-892-5557, is classified within Federal Supply Class 4470 (Nuclear Reactors) of the Furnace, Steam, Drying, Nuclear Reactors group. The manufacturer of record is Ashcroft Inc Dba Heise. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4470-00-892-5557 |
| Primary Part Number | 8930W1-2-776PC27 |
| Item Name | Seal Ring,nuclear Coolant System |
| FSC / FSG | 4470 / 44 — Nuclear Reactors |
| Manufacturer | Ashcroft Inc Dba Heise |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; 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 | Y |
| Part Number | Manufacturer |
|---|---|
| 8930W1-2-776PC27 | Ashcroft Inc Dba Heise (USA) |
| 8930W1-776PC27 | Ashcroft Inc Dba Heise (USA) |
| 8933B52A | Ashcroft Inc Dba Heise (USA) |
| Reference | Meaning |
|---|---|
| 8933B52A | 3/9 Design control — primary reference Dresser, Inc. Dba Dresser Equipment Group Div Industrial Valve Operations, Dresse |
| 8930W1-2-776PC27 | 5/9 Secondary reference Dresser, Inc. Dba Dresser Equipment Group Div Industrial Valve Operations, Dresse |
NSN 4470-00-892-5557 is a Seal Ring,nuclear Coolant System, manufactured by Ashcroft Inc Dba Heise, classified under FSC 4470, Nuclear Reactors. Status: active.
NSN 4470-00-892-5557 has 3 manufacturer part numbers on file: 8930W1-2-776PC27 (Ashcroft Inc Dba Heise), 8930W1-776PC27 (Ashcroft Inc Dba Heise), 8933B52A (Ashcroft Inc Dba Heise).
Key specifications for 8930W1-2-776PC27: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.. 2 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 4470-00-892-5557 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.