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990C639H01 — SWITCH,PRESSURE

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

990C639H01: SWITCH,PRESSURE.

The SWITCH,PRESSURE is a the manufacturer industrial component. Key specifications include overall_width: 4.060 INCHES NOMINAL IN, terminal_type: SCREW, overall_height: 3.880 INCHES NOMINAL IN, overall_length: 4.060 INCHES NOMINAL IN, inside_diameter: 0.125 INCHES NOMINAL ALL CONNECTIONS IN, mounting_method: THREADED STUD(S). This part is cataloged in the U.S.

Government catalog under NSN 5930-00-253-5176, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
990C639H01
NSN: 5930-00-253-5176
FSC: 5930 — Switches
CAGE: 18323 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA ELECTRONIC SYSTEMS (USA)
SPECIFICATIONS
overall_width4.060 INCHES NOMINAL IN
terminal_typeSCREW
overall_height3.880 INCHES NOMINAL IN
overall_length4.060 INCHES NOMINAL IN
inside_diameter0.125 INCHES NOMINAL ALL CONNECTIONS IN
mounting_methodTHREADED STUD(S)
style_designatorCYLINDRICAL W/MOUNTING LUGS
nominal_thread_size0.125 INCHES ALL PRESSURE CONNECTION IN
pressure_switch_typeDIFFERENTIAL
contact_adjustabilityACTUATION POINT ADJUSTABLE, PRESET
contact_action_stimulusINCREASE
contact_adjustment_typeEXTERNAL ACTUATION POINT SCREW
NSN5930-00-253-5176
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SWITCH,PRESSURE TITLE COMPONENT PN 990C639H01 MFR SWITCH,PRESSURE
KEY FEATURES
•
CONTACT ACTION STIMULUS: INCREASE
•
TERMINAL TYPE: SCREW
•
CONTACT LOAD CURRENT RATING: 100.0 MILLIAMPERES INDUCTIVE LOAD SINGLE VOLTAGE
•
MOUNTING METHOD: THREADED STUD(S)
•
CONTACT ADJUSTMENT RANGE: +0.20 TO 1.00 ACTUATION POINT INCHES OF WATER
•
STYLE DESIGNATOR: CYLINDRICAL W/MOUNTING LUGS
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT3.880 INCHES NOMINAL IN
CONTACT ACTION STIMULUSINCREASE
TERMINAL TYPESCREW
CONTACT LOAD CURRENT RATING100.0 MILLIAMPERES INDUCTIVE LOAD SINGLE VOLTAGE
MOUNTING METHODTHREADED STUD(S)
CONTACT ADJUSTMENT RANGE+0.20 TO 1.00 ACTUATION POINT INCHES OF WATER
STYLE DESIGNATORCYLINDRICAL W/MOUNTING LUGS
OVERALL LENGTH4.060 INCHES NOMINAL IN
OVERALL WIDTH4.060 INCHES NOMINAL IN
PRESSURE SWITCH TYPEDIFFERENTIAL
SUBSTITUTES & CROSS-REFERENCES 1
1820-1AReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 990C639H01?
990C639H01 is a SWITCH,PRESSURE.
What parts can replace 990C639H01?
There is 1 known substitute for 990C639H01: 1820-1A. Substitute compatibility should be verified for your specific system.
What is the NSN for 990C639H01?
990C639H01 is cataloged in the U.S. Government catalog under NSN 5930-00-253-5176. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.