PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20203GM51MValve,safety Relief

Anderson Greenwood Lp Dba Anderson Greenwood Crosby · NSN 4820-01-137-0189 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-137-0189 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-137-0189. Primary manufacturer part number: 20203GM51M.
Features
  • Valve,safety Relief — FSC 4820
  • Criticality Code Justification: ZZZY
  • Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.
  • 2 verified cross-references
  • Primary manufacturer: Anderson Greenwood Lp Dba Anderson Greenwood Crosby
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Valve,safety Relief, cataloged under National Stock Number 4820-01-137-0189, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Anderson Greenwood Lp Dba Anderson Greenwood Crosby. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-137-0189
Primary Part Number20203GM51M
Item NameValve,safety Relief
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerAnderson Greenwood Lp Dba Anderson Greenwood Crosby
StatusACTIVE
Criticality Code JustificationZZZY
Reference Number Differentiating CharacteristicsMATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5360-00-079-9411 INTERCHANGEABLE
Spring,helical,compression
3110-00-156-6752104184-3 INTERCHANGEABLE
Bearing,ball,annular
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
4310-00-168-8717 INTERCHANGEABLE
Guard,valve
5999-00-252-63501585384 INTERCHANGEABLE
Cap,electrical
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
3431-00-567-165313N28 INTERCHANGEABLE
Collet Body,welding Torch
Welding Nozzle Intl Inc
6610-00-570-0275 INTERCHANGEABLE
Clamp,gear
5940-00-834-9660013-3007-00-0-689 INTERCHANGEABLE
Terminal,stud
Itt Cannon Rf Products
5998-00-886-392420203 INTERCHANGEABLE
Electronic Components Assembly
Custom Metering Company Inc
3040-01-095-75222020-3 INTERCHANGEABLE
Connecting Link,rigid
Tyee Aircraft Inc Div Tyee Aircraft
5915-01-097-153592068 INTERCHANGEABLE
Filter,band Pass
Drs Signal Solutions, Inc.
Cross-Reference Index
Part NumberManufacturer
20203GM51M Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA)
20203 Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA)
Related Parts
5360-00-079-9411INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
3110-00-156-6752INTERCHANGEABLE
BEARING,BALL,ANNULAR
104184-3
4310-00-168-8717INTERCHANGEABLE
GUARD,VALVE
5999-00-252-6350INTERCHANGEABLE
CAP,ELECTRICAL
1585384
3431-00-567-1653INTERCHANGEABLE
COLLET BODY,WELDING TORCH
13N28
6610-00-570-0275INTERCHANGEABLE
CLAMP,GEAR
5940-00-834-9660INTERCHANGEABLE
TERMINAL,STUD
013-3007-00-0-689
5998-00-886-3924INTERCHANGEABLE
ELECTRONIC COMPONENTS ASSEMBLY
20203
3040-01-095-7522INTERCHANGEABLE
CONNECTING LINK,RIGID
2020-3
5915-01-097-1535INTERCHANGEABLE
FILTER,BAND PASS
92068
4820-01-136-4763INTERCHANGEABLE
VALVE,SAFETY RELIEF
4820-01-137-0190INTERCHANGEABLE
VALVE,SAFETY RELIEF

Frequently Asked Questions

What is NSN 4820-01-137-0189?

NSN 4820-01-137-0189 is a Valve,safety Relief, manufactured by Anderson Greenwood Lp Dba Anderson Greenwood Crosby, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-137-0189?

NSN 4820-01-137-0189 has 2 cross-referenced part numbers: 20203GM51M (Anderson Greenwood Lp Dba Anderson Greenwood Crosby), 20203 (Anderson Greenwood Lp Dba Anderson Greenwood Crosby).

What NSN replaces 4820-01-137-0189?

There are 12 known substitutes for 4820-01-137-0189: 5360-00-079-9411, 3110-00-156-6752, 4310-00-168-8717 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 20203GM51M?

Key specifications for 20203GM51M: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.. 2 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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