NSN 4820-00-033-6850 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-033-6850. Manufacturer of record part number: H575.
Nominal Outside Diameter Tube Accommodated: 0.375 INCHES FIRST END IN
Thread Direction: RIGHT-HAND FIRST END
Nominal Thread Size: 0.562 INCHES FIRST END IN
Seat Angle: 37.0 DEGREES FIRST END
Thread Class: 3A FIRST END A
Identification
NSN: 4820-00-033-6850
NIIN: 000336850
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: H575
Manufacturer: Ausco Inc
General Description
The Valve,check, cataloged under National Stock Number 4820-00-033-6850, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Ausco Inc. Government technical data includes 8 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. 3 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
4820-00-033-6850
Primary Part Number
H575
Item Name
Valve,check
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Ausco Inc
Status
ACTIVE
Connection Style
FLARED (TUBE) FIRST END
Style Designator
STRAIGHT THRU
Nominal Outside Diameter Tube Accommodated
0.375 INCHES FIRST END IN
Thread Direction
RIGHT-HAND FIRST END
Nominal Thread Size
0.562 INCHES FIRST END IN
Seat Angle
37.0 DEGREES FIRST END
Thread Class
3A FIRST END A
Thread Series Designator
UNF FIRST END
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 Items3
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
9150-00-261-8318POSSIBLE MATCH
HYDRAULIC FLUID,PETROLEUM BASE
Possible match (shared part number)
5310-00-823-8835MS21045C5POSSIBLE MATCH
NUT,SELF-LOCKING,HEXAGON
Possible match (shared part number)National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5945-01-170-996886920POSSIBLE MATCH
SOLENOID,ELECTRICAL
Possible match (shared part number)Whirlpool Corp Dba Whirlpool Corp
NSN 4820-00-033-6850 is a Valve,check, manufactured by Ausco Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-00-033-6850?
NSN 4820-00-033-6850 has 2 manufacturer part numbers on file: 386050 (Eaton Aerospace, Llc Dba Jackson South), H575 (Ausco Inc).
What NSN replaces 4820-00-033-6850?
3 possible matches (shared part number, not a government interchangeability claim): 9150-00-261-8318, 5310-00-823-8835, 5945-01-170-9968. Verify interchangeability with system specifications before substitution.
What are the specifications of H575?
Key specifications for H575: Connection Style: FLARED (TUBE) FIRST END; Style Designator: STRAIGHT THRU; Nominal Outside Diameter Tube Accommodated: 0.375 INCHES FIRST END IN; Thread Direction: RIGHT-HAND FIRST END. 8 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-033-6850 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.