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Technical Data Sheet
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644U ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The 644U is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 6685-00-228-3781, 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
644U
NSN: 6685-00-228-3781
FSC: 6685
CAGE: 61349 — AMETEK, INC. DIV AEROSPACE & DEFENSE (USA)
SPECIFICATIONS
Part Number644U
NSN6685-00-228-3781
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available 644U TITLE COMPONENT PN 644U MFR 644U
KEY FEATURES
•
SCALE SMALLEST INCREMENT: 1.0 INCHES AND 1.0 POUNDS PER SQUARE INCH (PSI) LBS
•
CONNECTION LOCATION: BACK, CENTER
•
SCALE INSCRIPTION/BACKGROUND COLOR: BLACK FIGURES ON WHITE BACKGROUND
•
MATERIAL: STEEL CASE
•
SCALE RANGE: +0.0 TO 30.0 INCHES OF MERCURY AND +0.0 TO 15.0 POUNDS PRESSURE PER SQUARE INCH LBS
•
POINTER TYPE: INDICATING
•
STUD LOCATION: BACK
TECHNICAL CHARACTERISTICS (FLIS)
SCALE SMALLEST INCREMENT1.0 INCHES AND 1.0 POUNDS PER SQUARE INCH (PSI) LBS
CONNECTION LOCATIONBACK, CENTER
SCALE INSCRIPTION/BACKGROUND COLORBLACK FIGURES ON WHITE BACKGROUND
MATERIALSTEEL CASE
SCALE RANGE+0.0 TO 30.0 INCHES OF MERCURY AND +0.0 TO 15.0 POUNDS PRESSURE PER SQUARE INCH LBS
MATERIALGLASS PROTECTIVE CRYSTAL
POINTER TYPEINDICATING
STUD LOCATIONBACK
MATERIALCOPPER ALLOY 511 ACTUATING ELEMENT
CONNECTOR TYPE VENTNOT PROVIDED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
25-1001XUC-01B-150PSI30VACInterchangeable
interchangeable cross-reference
interchangeable
2 1-2 3DFM1-8CBM30X150Interchangeable
interchangeable cross-reference
interchangeable
C844UInterchangeable
interchangeable cross-reference
interchangeable
143399Interchangeable
interchangeable cross-reference
interchangeable
137114Interchangeable
interchangeable cross-reference
interchangeable
10024REVAInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 644U?
644U is a 644U.
What parts can replace 644U?
There are 11 known substitutes for 644U: 25-1001XUC-01B-150PSI30VAC, 2 1-2 3DFM1-8CBM30X150, C844U and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 644U?
644U is cataloged in the Federal Logistics Information System (FLIS) under NSN 6685-00-228-3781. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026