General Characteristics Item Description: NICKEL-COPPER,QQ-N-281,CLASS A; 2.312 IN. O/A H,2.750 IN. BODY OD,HEX SOCKET,1.781 IN. W ACROSS FLATS; WITH FOUR HOLES,0.406 IN. DIA THRU AND COUNTERBORED 0.594 IN.,EQUALLY SPACED 90 DEG APART,ON PERIPHERY OF LARGEST END IN
Identification
NSN: 4820-01-103-0159
NIIN: 011030159
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
General Description
The Lock,valve, cataloged under National Stock Number 4820-01-103-0159, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 11 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-103-0159
Item Name
Lock,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
General Characteristics Item Description
NICKEL-COPPER,QQ-N-281,CLASS A; 2.312 IN. O/A H,2.750 IN. BODY OD,HEX SOCKET,1.781 IN. W ACROSS FLATS; WITH FOUR HOLES,0.406 IN. DIA THRU AND COUNTERBORED 0.594 IN.,EQUALLY SPACED 90 DEG APART,ON PERIPHERY OF LARGEST END 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 Items11
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-103-0160810-4385049-X-042POSSIBLE MATCH
GUIDE,VALVE STEM
Possible match (shared part number)Naval Ship Systems Command
4820-01-103-3290803-4385049-X-043POSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-103-3329810-4385049 ITEM 29POSSIBLE MATCH
STOP,ACTUATOR
Possible match (shared part number)Naval Ship Systems Command
4820-01-103-3330810-4385049-X-053POSSIBLE MATCH
CAP,CONNECTING ROD
Possible match (shared part number)Naval Ship Systems Command
4820-01-103-3331803-4385049-X-034POSSIBLE MATCH
RETAINER,DOWEL
Possible match (shared part number)Naval Ship Systems Command
4820-01-103-3385810-4385049-X-012POSSIBLE MATCH
CAP,VALVE
Possible match (shared part number)Naval Ship Systems Command
4820-01-103-3436810-4385049-X-037POSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Naval Ship Systems Command
4820-01-111-5698803-4385049-X-095POSSIBLE MATCH
RETAINER,DOWEL
Possible match (shared part number)Naval Ship Systems Command
4810-01-113-3738810-4385049-B-054POSSIBLE MATCH
CRANKSHAFT,VALVE
Possible match (shared part number)Naval Ship Systems Command
4810-01-113-4202810-4385049-B-020POSSIBLE MATCH
LINK,ADJUSTING
Possible match (shared part number)Naval Ship Systems Command
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
803-4385049-B-021
5/2Secondary reference
U.S. Government activity
803-4385049
D/9Drawing number reference only
U.S. Government activity
810-4385049-B-021
5/9Secondary reference
U.S. Government activity
810-4385049
5/9Secondary reference
U.S. Government activity
810-4385049-X-021
5/9Secondary reference
U.S. Government activity
803-4385049-X-021
3/2Design control — primary reference
U.S. Government activity
Related Parts
4820-01-103-0160POSSIBLE MATCH
GUIDE,VALVE STEM
810-4385049-X-042
4820-01-103-3290POSSIBLE MATCH
SEAT,VALVE
803-4385049-X-043
4820-01-103-3329POSSIBLE MATCH
STOP,ACTUATOR
810-4385049 ITEM 29
4820-01-103-3330POSSIBLE MATCH
CAP,CONNECTING ROD
810-4385049-X-053
4820-01-103-3331POSSIBLE MATCH
RETAINER,DOWEL
803-4385049-X-034
4820-01-103-3385POSSIBLE MATCH
CAP,VALVE
810-4385049-X-012
4820-01-103-3436POSSIBLE MATCH
DISK,VALVE
810-4385049-X-037
4820-01-111-5698POSSIBLE MATCH
RETAINER,DOWEL
803-4385049-X-095
4810-01-113-3738POSSIBLE MATCH
CRANKSHAFT,VALVE
810-4385049-B-054
4810-01-113-4202POSSIBLE MATCH
LINK,ADJUSTING
810-4385049-B-020
4810-01-113-5381POSSIBLE MATCH
STEM,FLUID VALVE
810-4385049-X-048
Frequently Asked Questions
What is NSN 4820-01-103-0159?
NSN 4820-01-103-0159 is a Lock,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-103-0159?
11 possible matches (shared part number, not a government interchangeability claim): 4820-01-103-0160, 4820-01-103-3290, 4820-01-103-3329. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-01-103-0159?
Key specifications for 4820-01-103-0159: General Characteristics Item Description: NICKEL-COPPER,QQ-N-281,CLASS A; 2.312 IN. O/A H,2.750 IN. BODY OD,HEX SOCKET,1.781 IN. W ACROSS FLATS; WITH FOUR HOLES,0.406 IN. DIA THRU AND COUNTERBORED 0.594 IN.,EQUALLY SPACED 90 DEG APART,ON PERIPHERY OF LARGEST END IN. 1 specification is documented in the U.S. Government catalog.
Is NSN 4820-01-103-0159 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.