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Technical Data Sheet
PartsTable / MRO / M-1977
M-1977 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
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 M-1977 is a the manufacturer industrial component. Key specifications include end_item_identification: HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT), ALL BODY TYPES (ABT) M977, M978, M983, M984, M984A1, M985. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 6625-00-042-8974, 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→ M-1977
NSN: 6625-00-042-8974
FSC: 6625
CAGE: 28304 — CUSTOM METERING COMPANY INC (USA)
SPECIFICATIONS
end_item_identificationHEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT), ALL BODY TYPES (ABT) M977, M978, M983, M984, M984A1, M985
NSN6625-00-042-8974
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available M-1977 TITLE COMPONENT PN M-1977 MFR M-1977
KEY FEATURES
•
MOUNTING HOLE DIAMETER: 0.150 INCHES NOMINAL IN
•
MOVEMENT SUSPENSION METHOD: JEWEL PIVOT BASE
•
FEATURES PROVIDED: ZERO ADJUSTER
•
SCALE GRADUATION TYPE: LINEAR SINGLE INDICATOR ALL RANGES
•
MOUNTING FACILITY TYPE AND QUANTITY: 3 UNTHREADED HOLE(S)
•
CIRCUIT ATTACHMENT METHOD AND QUANTITY: 2 SOLDER LUG AND 2 THREADED STUD
TECHNICAL CHARACTERISTICS (FLIS)
MOUNTING HOLE DIAMETER0.150 INCHES NOMINAL IN
OVERALL LENGTH2.470 INCHES NOMINAL IN
MOVEMENT SUSPENSION METHODJEWEL PIVOT BASE
FEATURES PROVIDEDZERO ADJUSTER
SCALE GRADUATION TYPELINEAR SINGLE INDICATOR ALL RANGES
SPECIAL FEATURESRUGGEDIZED
MOUNTING FACILITY TYPE AND QUANTITY3 UNTHREADED HOLE(S)
CIRCUIT ATTACHMENT METHOD AND QUANTITY2 SOLDER LUG AND 2 THREADED STUD
DIAL SCALE MARKING COLORRED SINGLE INDICATOR SECOND RANGE
SUPPLEMENTARY FEATURESREQUIRES 400 HZ RECTIFIER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
2531Upgraded Successor
successor cross-reference
successor
25RUpgraded Successor
successor cross-reference
successor
25SRUpgraded Successor
successor cross-reference
successor
321HRUpgraded Successor
successor cross-reference
successor
MMI-9828Upgraded Successor
successor cross-reference
successor
MR36W001DCKVRUpgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M-1977?
M-1977 is a M-1977. It is classified as a MRO (MRO_GENERAL).
What parts can replace M-1977?
There are 19 known substitutes for M-1977: 2531, 25R, 25SR and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M-1977?
M-1977 is cataloged in the Federal Logistics Information System (FLIS) under NSN 6625-00-042-8974. 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