NSN 4820-00-221-5347 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-221-5347. Manufacturer of record part number: 345-3.
Nominal Pipe Size Accommodated: 0.375 INCHES ALL ENDS IN
Connection Style: PLAIN, OPTIONAL END (PIPE) ALL ENDS
Mounting Position: HORIZONTAL OR VERTICAL
Connection Type: THREADED INTERNAL PIPE ALL ENDS
Style Designator: STRAIGHT THRU
Thread Direction: RIGHT-HAND ALL ENDS
Identification
NSN: 4820-00-221-5347
NIIN: 002215347
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 345-3
Manufacturer: Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division
General Description
The Valve,check, cataloged under National Stock Number 4820-00-221-5347, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division. Government technical data includes 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 11 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4820-00-221-5347
Primary Part Number
345-3
Item Name
Valve,check
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division
Status
ACTIVE
Flow Control Device
CONE
Nominal Pipe Size Accommodated
0.375 INCHES ALL ENDS IN
Connection Style
PLAIN, OPTIONAL END (PIPE) ALL ENDS
Mounting Position
HORIZONTAL OR VERTICAL
Connection Type
THREADED INTERNAL PIPE ALL ENDS
Style Designator
STRAIGHT THRU
Thread Direction
RIGHT-HAND ALL ENDS
Nominal Thread Size
0.375 INCHES ALL ENDS IN
Disk Loading Method
SPRING
Material
ALUMINUM ALLOY SEAT
Material
ALUMINUM ALLOY BODY
Thread Series Designator
NPT ALL ENDS
Valve Operation Method
AUTOMATIC
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 Items11
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5310-00-276-86183453POSSIBLE MATCH
NUT,PLAIN,SLOTTED,HEXAGON
Possible match (shared part number)Komatsu America Corporation
2825-00-388-69153453POSSIBLE MATCH
NOZZLE ASSEMBLY
Possible match (shared part number)Northrop Grumman Systems Corporation Div Marine Systems
6625-00-432-1449POSSIBLE MATCH
SHIELD,BOTTOM
Possible match (shared part number)
6750-01-140-00693453POSSIBLE MATCH
PLATE,PHOTOGRAPHIC
Possible match (shared part number)Horizons Incorporated Div Imaging Systems Group
5355-01-229-4061POSSIBLE MATCH
DIAL,CONTROL
Possible match (shared part number)
6105-01-308-094234-53POSSIBLE MATCH
STATOR,MOTOR
Possible match (shared part number)Abb Motors & Mechanical Inc Div Abb Motors and Mechanical Inc.
5325-01-340-88593453POSSIBLE MATCH
RING,RETAINING
Possible match (shared part number)DP Manufacturing Inc.
6515-01-363-3564POSSIBLE MATCH
BLADE,ARTHROSCOPIC,SURGICAL
Possible match (shared part number)
6515-01-363-77413453POSSIBLE MATCH
BLADE,ARTHROSCOPIC,SURGICAL
Possible match (shared part number)Dyonics Inc Sub of William H Rorer Inc
1005-01-542-30293453POSSIBLE MATCH
SUPPRESSOR,FLASH
Possible match (shared part number)General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA)
Reference documents
Reference
Meaning
345-3
5/9Secondary reference
U.S. Government activity
Related Parts
5310-00-276-8618POSSIBLE MATCH
NUT,PLAIN,SLOTTED,HEXAGON
3453
2825-00-388-6915POSSIBLE MATCH
NOZZLE ASSEMBLY
3453
6625-00-432-1449POSSIBLE MATCH
SHIELD,BOTTOM
6750-01-140-0069POSSIBLE MATCH
PLATE,PHOTOGRAPHIC
3453
5355-01-229-4061POSSIBLE MATCH
DIAL,CONTROL
6105-01-308-0942POSSIBLE MATCH
STATOR,MOTOR
34-53
5325-01-340-8859POSSIBLE MATCH
RING,RETAINING
3453
6515-01-363-3564POSSIBLE MATCH
BLADE,ARTHROSCOPIC,SURGICAL
6515-01-363-7741POSSIBLE MATCH
BLADE,ARTHROSCOPIC,SURGICAL
3453
1005-01-542-3029POSSIBLE MATCH
SUPPRESSOR,FLASH
3453
6515-01-549-6453POSSIBLE MATCH
PLUG,EAR
EP3-MPR
Frequently Asked Questions
What is NSN 4820-00-221-5347?
NSN 4820-00-221-5347 is a Valve,check, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-00-221-5347?
NSN 4820-00-221-5347 has 2 manufacturer part numbers on file: 345-3 (Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division), 1656338 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
What NSN replaces 4820-00-221-5347?
11 possible matches (shared part number, not a government interchangeability claim): 5310-00-276-8618, 2825-00-388-6915, 6625-00-432-1449. Verify interchangeability with system specifications before substitution.
What are the specifications of 345-3?
Key specifications for 345-3: Flow Control Device: CONE; Nominal Pipe Size Accommodated: 0.375 INCHES ALL ENDS IN; Connection Style: PLAIN, OPTIONAL END (PIPE) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL. 13 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-221-5347 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.