Outside Diameter: 0.747 INCHES MINIMUM AND 0.792 INCHES MAXIMUM IN
Style Designator: PLAIN
Inside Diameter: 0.258 INCHES NOMINAL IN
Material: RUBBER NATURAL
Identification
NSN: 4820-01-121-8028
NIIN: 011218028
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
General Description
The Disk,valve, cataloged under National Stock Number 4820-01-121-8028, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 8 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-121-8028
Item Name
Disk,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Outside Diameter
0.747 INCHES MINIMUM AND 0.792 INCHES MAXIMUM IN
Style Designator
PLAIN
Inside Diameter
0.258 INCHES NOMINAL IN
Material
RUBBER NATURAL
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 Items8
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5330-01-155-15961708POSSIBLE MATCH
GASKET
Possible match (shared part number)Parker-Hannifin Corporation Div O-Ring Division
6680-01-180-564041867POSSIBLE MATCH
GAGE ROD-CAP,LIQUID LEVEL
Possible match (shared part number)Center - Moeller Products Llc
4720-01-196-7485POSSIBLE MATCH
HOSE ASSEMBLY,NONMETALLIC
Possible match (shared part number)
5331-01-304-23694187POSSIBLE MATCH
O-RING
Possible match (shared part number)Jered Llc
5307-01-340-20744-187POSSIBLE MATCH
STUD,PLAIN
Possible match (shared part number)Raytheon Company Dba Raytheon Co
8135-01-354-2050POSSIBLE MATCH
DIVIDER,BOX
Possible match (shared part number)
5985-01-379-07924187POSSIBLE MATCH
BASE,ANTENNA SUPPORT
Possible match (shared part number)Shakespeare Company, Llc Div Military Electronics
6545-01-533-536960MP00AUPOSSIBLE MATCH
BAG,MEDICAL INSTRUMENT AND SUPPL
Possible match (shared part number)Eagle Industries Unlimited, Llc
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
15420-202 DET 24
3/2Design control — primary reference
U.S. Government activity
4186-7
5/9Secondary reference
Atkomatic Valve Co Inc
15400-202 DET 24
3/2Design control — primary reference
U.S. Government activity
15400-202 DET 24
5/9Secondary reference
Atkomatic Valve Co Inc
4186-7
C/1Advisory reference — outside the item-of-supply concept
U.S. Government activity
418-7
3/2Design control — primary reference
U.S. Government activity
15420-202 DET 24
5/9Secondary reference
Atkomatic Valve Co Inc
Related Parts
5330-01-155-1596POSSIBLE MATCH
GASKET
1708
6680-01-180-5640POSSIBLE MATCH
GAGE ROD-CAP,LIQUID LEVEL
41867
4720-01-196-7485POSSIBLE MATCH
HOSE ASSEMBLY,NONMETALLIC
5331-01-304-2369POSSIBLE MATCH
O-RING
4187
5307-01-340-2074POSSIBLE MATCH
STUD,PLAIN
4-187
8135-01-354-2050POSSIBLE MATCH
DIVIDER,BOX
5985-01-379-0792POSSIBLE MATCH
BASE,ANTENNA SUPPORT
4187
6545-01-533-5369POSSIBLE MATCH
BAG,MEDICAL INSTRUMENT AND SUPPL
60MP00AU
Frequently Asked Questions
What is NSN 4820-01-121-8028?
NSN 4820-01-121-8028 is a Disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-121-8028?
8 possible matches (shared part number, not a government interchangeability claim): 5330-01-155-1596, 6680-01-180-5640, 4720-01-196-7485. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-01-121-8028?
Key specifications for 4820-01-121-8028: Overall Height: 0.235 INCHES NOMINAL IN; Outside Diameter: 0.747 INCHES MINIMUM AND 0.792 INCHES MAXIMUM IN; Style Designator: PLAIN; Inside Diameter: 0.258 INCHES NOMINAL IN. 4 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-121-8028 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.