NSN 4820-01-186-4718 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-186-4718. Manufacturer of record part number: 6820556-3.
Also searched as4820-01-186-4718 ·
4820011864718 ·
NIIN 011864718 ·
01-186-4718 ·
FSC 4820 Valves, Nonpowered · CAGE 63005 · 6820556-3
Body Outside Diameter: 0.661 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN
Style Designator: PLAIN
Material Document and Classification: AMS4640 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
Body Inside Diameter: 0.344 INCHES MINIMUM AND 0.346 INCHES MAXIMUM IN
Seat Radius: 0.218 INCHES NOMINAL IN
Material: COPPER ALLOY OVERALL
Seating Surface Shape: RADIAL
Identification
NSN: 4820-01-186-4718
NIIN: 011864718
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 6820556-3
Manufacturer: Rolls-Royce Corporation
General Description
The Seat,valve, cataloged under National Stock Number 4820-01-186-4718, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Rolls-Royce Corporation. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097
4820-00-000-0097 · Item name not on file
4820-00-001-0010
VALVE,ROTARY,SELECTOR
4820-00-001-0020
4820-00-001-0020 · Item name not on file
4820-00-001-0021
4820-00-001-0021 · Item name not on file
4820-00-001-0032
4820-00-001-0032 · Item name not on file
4820-00-001-0037
VALVE,SAFETY RELIEF
4820-00-001-0042
4820-00-001-0042 · Item name not on file
4820-00-001-1230
4820-00-001-1230 · Item name not on file
Frequently Asked Questions
What is NSN 4820-01-186-4718?
NSN 4820-01-186-4718 is a Seat,valve, manufactured by Rolls-Royce Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-186-4718?
NSN 4820-01-186-4718 has 2 manufacturer part numbers on file: 6820556-3 (Rolls-Royce Corporation), 6820556-3 (Allison Transmission Inc Dba Allison Transmission, Inc).
What are the specifications of 6820556-3?
Key specifications for 6820556-3: Overall Height: 0.170 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN; Body Outside Diameter: 0.661 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN; Style Designator: PLAIN; Material Document and Classification: AMS4640 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 7 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-186-4718 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
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.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.