NSN 4820-01-685-3977 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-685-3977. Manufacturer of record part number: 845-8513210-45.
Nearby stock numbers← 4820-01-685-3968 Valve, Regulating, Temperature
·
4820-01-685-3989 Stem Support →
4820-01-685-3977 — Valves, Nonpowered
Features
Coupling,stem — FSC 4820
1 manufacturer part number on file
Manufacturer of record: Huntington Ingalls Inc Div Newport News Shipbuilding
Identification
NSN: 4820-01-685-3977
NIIN: 016853977
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 845-8513210-45
Manufacturer: Huntington Ingalls Inc Div Newport News Shipbuilding
General Description
The Coupling,stem, cataloged under National Stock Number 4820-01-685-3977, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Huntington Ingalls Inc Div Newport News Shipbuilding. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Catalog Facts
Item Name
Coupling,stem
FSC / FSG
4820 — Valves, Nonpowered (FSG 48)
Manufacturers
Huntington Ingalls Inc Div Newport News Shipbuilding (CAGE 43689)
Technical Specifications
Parameter
Value
NSN
4820-01-685-3977
Primary Part Number
845-8513210-45
Item Name
Coupling,stem
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Huntington Ingalls Inc Div Newport News Shipbuilding
Status
ACTIVE
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items4
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-685-3989845-8513210-24POSSIBLE MATCH
STEM SUPPORT
Possible match (shared part number)Huntington Ingalls Inc Div Newport News Shipbuilding
4820-01-685-4017845-8513210-40POSSIBLE MATCH
KEY,STEM
Possible match (shared part number)Naval Sea Systems Command
5315-01-686-2990845-8513210-39POSSIBLE MATCH
PIN,STRAIGHT,HEADLESS
Possible match (shared part number)Naval Sea Systems Command
5365-01-686-2993845-8513210-19POSSIBLE MATCH
BUSHING,NONMETALLIC
Possible match (shared part number)Naval Sea Systems Command
Huntington Ingalls Inc Div Newport News Shipbuilding (USA)
Reference documents
Reference
Meaning
845-8513210
D/9Drawing number reference only
Huntington Ingalls Inc Div Newport News Shipbuilding
Related Parts
4820-01-685-3989POSSIBLE MATCH
STEM SUPPORT
845-8513210-24
4820-01-685-4017POSSIBLE MATCH
KEY,STEM
845-8513210-40
5315-01-686-2990POSSIBLE MATCH
PIN,STRAIGHT,HEADLESS
845-8513210-39
5365-01-686-2993POSSIBLE MATCH
BUSHING,NONMETALLIC
845-8513210-19
Frequently Asked Questions
What is NSN 4820-01-685-3977?
NSN 4820-01-685-3977 is a Coupling,stem, manufactured by Huntington Ingalls Inc Div Newport News Shipbuilding, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-685-3977?
NSN 4820-01-685-3977 has 1 manufacturer part number on file: 845-8513210-45 (Huntington Ingalls Inc Div Newport News Shipbuilding).
What NSN replaces 4820-01-685-3977?
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-685-3989, 4820-01-685-4017, 5315-01-686-2990. Verify interchangeability with system specifications before substitution.
Is NSN 4820-01-685-3977 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.