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Technical Data Sheet
PartsTable / MRO / P644
P644 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The RESISTOR,FIXED,WIRE WOUND is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 511 ACTUATING ELEMENT, dial_size: 2-1/2 IN. DIA IN, bezel_type: SNAP-ON, body_width: 14.000 INCHES NOMINAL IN, head_style: HEXAGON, scale_name: PRESSURE.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-012-0706, 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
MRO→ MRO_GENERAL→ P644
NSN: 5305-00-012-0706
FSC: 5305
CAGE: 22888 — FMC CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY 511 ACTUATING ELEMENT
dial_size2-1/2 IN. DIA IN
bezel_typeSNAP-ON
body_width14.000 INCHES NOMINAL IN
head_styleHEXAGON
scale_namePRESSURE
scale_typeSINGLE
body_height9.000 INCHES NOMINAL IN
body_length20.000 INCHES NOMINAL IN
head_height0.156 INCHES NOMINAL IN
scale_range+0.0 TO 300.0 POUNDS PRESSURE PER SQUARE INCH LBS
pointer_typeINDICATING
NSN5305-00-012-0706
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: P644 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
WIDTH BETWEEN FLATS: 0.438 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE GR 1 OR 2 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: STEEL OVERALL
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND 10P STYLE
•
THREAD QUANTITY PER INCH: 20
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
SURFACE TREATMENT: CADMIUM OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH BETWEEN FLATS0.438 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
MATERIAL DOCUMENT AND CLASSIFICATIONSAE GR 1 OR 2 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL OVERALL
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 10P STYLE
THREAD QUANTITY PER INCH20
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
SURFACE TREATMENTCADMIUM OVERALL
FASTENER LENGTH0.500 INCHES NOMINAL IN
HEAD STYLEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
34U-181Interchangeable
interchangeable cross-reference
interchangeable
000527378Interchangeable
interchangeable cross-reference
interchangeable
76002Interchangeable
interchangeable cross-reference
interchangeable
ASME B18.2.1Interchangeable
interchangeable cross-reference
interchangeable
18257-001Interchangeable
interchangeable cross-reference
interchangeable
D305308 FIND NO 107Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is P644?
P644 is a RESISTOR,FIXED,WIRE WOUND. It is classified as a MRO (MRO_GENERAL).
What parts can replace P644?
There are 15 known substitutes for P644: 34U-181, 000527378, 76002 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for P644?
P644 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-012-0706. 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