NSN 4820-01-657-3725 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-657-3725. Manufacturer of record part number: RDDA-CSV/AP.
Also searched as4820-01-657-3725 ·
4820016573725 ·
NIIN 016573725 ·
01-657-3725 ·
FSC 4820 Valves, Nonpowered · CAGE 54035 · RDDA-CSV/AP · HI-1458-3000 · HI-1458-3000 ITEM NO 16
Manufacturer of record: Sun Hydraulics Corporation
Identification
NSN: 4820-01-657-3725
NIIN: 016573725
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: RDDA-CSV/AP
Manufacturer: Sun Hydraulics Corporation
General Description
The Valve,safety Relief, cataloged under National Stock Number 4820-01-657-3725, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Sun Hydraulics Corporation. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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.
Catalog Facts
Item Name
Valve,safety Relief
FSC / FSG
4820 — Valves, Nonpowered (FSG 48)
Manufacturers
Sun Hydraulics Corporation (CAGE 54035)
Technical Specifications
Parameter
Value
NSN
4820-01-657-3725
Primary Part Number
RDDA-CSV/AP
Item Name
Valve,safety Relief
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Sun Hydraulics Corporation
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 Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-657-3735PRDC-CVI/AP-100PSIPOSSIBLE MATCH
VALVE,SAFETY RELIEF
Possible match (shared part number)Sun Hydraulics Corporation
4820-01-657-3738NFDC-LAV/APPOSSIBLE MATCH
STEM,NEEDLE VALVE
Possible match (shared part number)Sun Hydraulics Corporation
4730-01-657-3745LTMA-10-100POSSIBLE MATCH
STRAINER,SUCTION
Possible match (shared part number)Lenz Co
6115-01-657-5248HI-1458-3000POSSIBLE MATCH
HYDRAULIC MOTOR-GENERATOR
Possible match (shared part number)Hhe Services, Inc.
6685-01-675-1296LD301-M41I-V01S-010/I1/H1/ZN2POSSIBLE MATCH
INDICATOR,PRESSURE
Possible match (shared part number)Smar International Corporation
C/1Advisory reference — outside the item-of-supply concept
Hhe Services, Inc.
Related Parts
4820-01-657-3735POSSIBLE MATCH
VALVE,SAFETY RELIEF
PRDC-CVI/AP-100PSI
4820-01-657-3738POSSIBLE MATCH
STEM,NEEDLE VALVE
NFDC-LAV/AP
4730-01-657-3745POSSIBLE MATCH
STRAINER,SUCTION
LTMA-10-100
6115-01-657-5248POSSIBLE MATCH
HYDRAULIC MOTOR-GENERATOR
HI-1458-3000
6685-01-675-1296POSSIBLE MATCH
INDICATOR,PRESSURE
LD301-M41I-V01S-010/I1/H1/ZN2
Frequently Asked Questions
What is NSN 4820-01-657-3725?
NSN 4820-01-657-3725 is a Valve,safety Relief, manufactured by Sun Hydraulics Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-657-3725?
NSN 4820-01-657-3725 has 1 manufacturer part number on file: RDDA-CSV/AP (Sun Hydraulics Corporation).
What NSN replaces 4820-01-657-3725?
5 possible matches (shared part number, not a government interchangeability claim): 4820-01-657-3735, 4820-01-657-3738, 4730-01-657-3745. Verify interchangeability with system specifications before substitution.
Is NSN 4820-01-657-3725 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.