The Diaphragm,actuator Valve,special, cataloged under National Stock Number 4820-01-074-0511, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-074-0511
Item Name
Diaphragm,actuator Valve,special
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Outside Diameter
1.969 INCHES NOMINAL IN
Supplementary Features
MATERIAL: FIBER
Center Hole Diameter
0.156 INCHES NOMINAL IN
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 Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5821-01-114-6925577R903H13POSSIBLE MATCH
CONTROL,RADIO SET
Possible match (shared part number)Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
4530-01-122-3718N-D-40641 PC49POSSIBLE MATCH
SLEEVE,POSITION,JACKET TUBE
Possible match (shared part number)Todd Combustion Inc
5325-01-163-613713749POSSIBLE MATCH
RING,RETAINING
Possible match (shared part number)New Venture Gear Inc New Process Gear Div
5660-01-248-6724POSSIBLE MATCH
POST,FENCE,METAL
Possible match (shared part number)
6625-01-577-6744ESA612POSSIBLE MATCH
TESTER,SAFETY,ELECTRICAL MEDICAL
Possible match (shared part number)Fluke Biomedical Dba Syncor Radiation Mgt Llc
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
13749
3/2Design control — primary reference
U.S. Government activity
Related Parts
5821-01-114-6925POSSIBLE MATCH
CONTROL,RADIO SET
577R903H13
4530-01-122-3718POSSIBLE MATCH
SLEEVE,POSITION,JACKET TUBE
N-D-40641 PC49
5325-01-163-6137POSSIBLE MATCH
RING,RETAINING
13749
5660-01-248-6724POSSIBLE MATCH
POST,FENCE,METAL
6625-01-577-6744POSSIBLE MATCH
TESTER,SAFETY,ELECTRICAL MEDICAL
ESA612
Frequently Asked Questions
What is NSN 4820-01-074-0511?
NSN 4820-01-074-0511 is a Diaphragm,actuator Valve,special, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-074-0511?
5 possible matches (shared part number, not a government interchangeability claim): 5821-01-114-6925, 4530-01-122-3718, 5325-01-163-6137. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-01-074-0511?
Key specifications for 4820-01-074-0511: Outside Diameter: 1.969 INCHES NOMINAL IN; Supplementary Features: MATERIAL: FIBER; Special Features: FLANGE DIA 1.500 IN. IN; Center Hole Diameter: 0.156 INCHES NOMINAL IN. 3 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-074-0511 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.