PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1/2NA3-126RCSPres Rel Scr Lock

Mark Controls Corp Pacific Valves Div · NSN 4820-01-187-6354 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-187-6354 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-187-6354. Primary manufacturer part number: 1/2NA3-126RCS.
Features
  • Pres Rel Scr Lock — FSC 4820
  • Criticality Code Justification: ZZZY
  • Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
  • 3 verified cross-references
  • Primary manufacturer: Mark Controls Corp Pacific Valves Div
Applications
  • Flow control in piping systems
  • Water treatment infrastructure
  • Industrial process control
General Description

The Pres Rel Scr Lock, cataloged under National Stock Number 4820-01-187-6354, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Mark Controls Corp Pacific Valves Div. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 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
NSN4820-01-187-6354
Primary Part Number1/2NA3-126RCS
Item NamePres Rel Scr Lock
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerMark Controls Corp Pacific Valves Div
StatusACTIVE
Criticality Code JustificationZZZY
Reference Number Differentiating CharacteristicsMATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5340-00-377-30709052 INTERCHANGEABLE
Cap,protective,dust and Moisture
Cummins Inc.
5930-00-548-94159052 INTERCHANGEABLE
Switch,push-Pull
Cole Hersee Company
3110-00-554-5830204-11-609 INTERCHANGEABLE
Bearing,ball,annular
Air & Liquid Systems Corporation Dba Buffalo Pumps
5355-00-579-681990-5-2 INTERCHANGEABLE
Knob
Raytheon Company Dba Raytheon Co
5950-00-632-78799052 INTERCHANGEABLE
Coil,radio Frequency
Bourns Inc
6625-01-028-61022896565-1 INTERCHANGEABLE
Meter,arbitrary Scale
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
3010-01-069-5313142C829H01 INTERCHANGEABLE
Coupling Half Set
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
4330-01-225-90909052 INTERCHANGEABLE
Filter,fluid
Arrow Pneumatics Inc
4820-01-261-41199051-4 INTERCHANGEABLE
Valve,globe
Dragon Valves Inc
3439-01-394-4041 INTERCHANGEABLE
Tip,electric Soldering Iron
Cross-Reference Index
Part NumberManufacturer
1/2NA3-126RCS Mark Controls Corp Pacific Valves Div (USA)
9052 Mark Controls Corp Pacific Valves Div (USA)
9052-1/2NA3-126RCS Mark Controls Corp Pacific Valves Div (USA)
Related Parts
5340-00-377-3070INTERCHANGEABLE
CAP,PROTECTIVE,DUST AND MOISTURE
9052
5930-00-548-9415INTERCHANGEABLE
SWITCH,PUSH-PULL
9052
3110-00-554-5830INTERCHANGEABLE
BEARING,BALL,ANNULAR
204-11-609
5355-00-579-6819INTERCHANGEABLE
KNOB
90-5-2
5950-00-632-7879INTERCHANGEABLE
COIL,RADIO FREQUENCY
9052
6625-01-028-6102INTERCHANGEABLE
METER,ARBITRARY SCALE
2896565-1
3010-01-069-5313INTERCHANGEABLE
COUPLING HALF SET
142C829H01
4330-01-225-9090INTERCHANGEABLE
FILTER,FLUID
9052
4820-01-261-4119INTERCHANGEABLE
VALVE,GLOBE
9051-4
3439-01-394-4041INTERCHANGEABLE
TIP,ELECTRIC SOLDERING IRON
5998-01-542-8526INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
9052
6260-01-586-5276INTERCHANGEABLE
REFLECTOR,LIGHT
905-2

Frequently Asked Questions

What is NSN 4820-01-187-6354?

NSN 4820-01-187-6354 is a Pres Rel Scr Lock, manufactured by Mark Controls Corp Pacific Valves Div, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-187-6354?

NSN 4820-01-187-6354 has 3 cross-referenced part numbers: 1/2NA3-126RCS (Mark Controls Corp Pacific Valves Div), 9052 (Mark Controls Corp Pacific Valves Div), 9052-1/2NA3-126RCS (Mark Controls Corp Pacific Valves Div).

What NSN replaces 4820-01-187-6354?

There are 12 known substitutes for 4820-01-187-6354: 5340-00-377-3070, 5930-00-548-9415, 3110-00-554-5830 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 1/2NA3-126RCS?

Key specifications for 1/2NA3-126RCS: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER 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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