NSN 4820-01-197-8638 · NIIN 011978638 · Part number 20335-H PIECE 29
Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 04537
Government record, cited
NSN 4820-01-197-8638 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-197-8638. Manufacturer of record part number: 20335-H PIECE 29.
Manufacturer of record: Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
Identification
NSN: 4820-01-197-8638
NIIN: 011978638
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 20335-H PIECE 29
Manufacturer: Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
General Description
The Stem,fluid Valve, cataloged under National Stock Number 4820-01-197-8638, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 9 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-197-8638
Primary Part Number
20335-H PIECE 29
Item Name
Stem,fluid Valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
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 Items9
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
3010-01-197-890220335-H PIECE 16POSSIBLE MATCH
COUPLING,SHAFT,FLEXIBLE
Possible match (shared part number)Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
4820-01-197-893720335-HPOSSIBLE MATCH
VALVE,GLOBE
Possible match (shared part number)Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
4820-01-197-898420335-H PIECE 33POSSIBLE MATCH
BLOCK,TRIGGER,VALVE
Possible match (shared part number)Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
4820-01-197-899332447-020-3294-031POSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
4820-01-197-902222036-APOSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
3040-01-198-302820335-H PIECE 6POSSIBLE MATCH
PISTON,LINEAR ACTUATING CYLINDER
Possible match (shared part number)Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
3040-01-198-307420335-H PIECE 5POSSIBLE MATCH
CYLINDER,ACTUATING,LINEAR
Possible match (shared part number)Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
3040-01-198-307620335-H PIECE 2POSSIBLE MATCH
CYLINDER ASSEMBLY,ACTUATING,LINE
Possible match (shared part number)Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
4820-01-199-876120335-H PIECE 21POSSIBLE MATCH
RING,BODY,VALVE
Possible match (shared part number)Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa (USA)
Reference documents
Reference
Meaning
20335-H
D/9Drawing number reference only
Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
Related Parts
3010-01-197-8902POSSIBLE MATCH
COUPLING,SHAFT,FLEXIBLE
20335-H PIECE 16
4820-01-197-8937POSSIBLE MATCH
VALVE,GLOBE
20335-H
4820-01-197-8984POSSIBLE MATCH
BLOCK,TRIGGER,VALVE
20335-H PIECE 33
4820-01-197-8993POSSIBLE MATCH
STEM,FLUID VALVE
32447-020-3294-031
4820-01-197-9022POSSIBLE MATCH
DISK,VALVE
22036-A
3040-01-198-3028POSSIBLE MATCH
PISTON,LINEAR ACTUATING CYLINDER
20335-H PIECE 6
3040-01-198-3074POSSIBLE MATCH
CYLINDER,ACTUATING,LINEAR
20335-H PIECE 5
3040-01-198-3076POSSIBLE MATCH
CYLINDER ASSEMBLY,ACTUATING,LINE
20335-H PIECE 2
4820-01-199-8761POSSIBLE MATCH
RING,BODY,VALVE
20335-H PIECE 21
Frequently Asked Questions
What is NSN 4820-01-197-8638?
NSN 4820-01-197-8638 is a Stem,fluid Valve, manufactured by Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-197-8638?
NSN 4820-01-197-8638 has 1 manufacturer part number on file: 20335-H PIECE 29 (Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa).
What NSN replaces 4820-01-197-8638?
9 possible matches (shared part number, not a government interchangeability claim): 3010-01-197-8902, 4820-01-197-8937, 4820-01-197-8984. Verify interchangeability with system specifications before substitution.
What are the specifications of 20335-H PIECE 29?
Key specifications for 20335-H PIECE 29: Special Features: STEEL. 0 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-197-8638 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.