PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

HD654Meter,time Totalizing

Ideal Precision Meter Co Dba Ideal Precision Meter Co · NSN 6645-00-940-0759 · FSC 6645 · No Item Name Available
Verified by PartsTable
NSN 6645-00-940-0759 — this item is cataloged by the U.S. Government under National Stock Number 6645-00-940-0759. Primary manufacturer part number: HD654.
Features
  • Meter,time Totalizing — FSC 6645
  • Terminal Quantity: 2
  • Current Type: AC
  • Mounting Type: PANEL
  • Operating Frequency: 400.0 HERTZ NOMINAL
  • Voltage Rating: 120.0 VOLTS NOMINAL
  • Mounting Configuration: THREE 0.150 IN. DIA MTG HOLES ON A 1.580 IN. RADIUS SPACED 120 DEG APART IN
  • Mounting Flange Diameter: 3.500 INCHES MAXIMUM IN
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Meter,time Totalizing, cataloged under National Stock Number 6645-00-940-0759, is classified within Federal Supply Class 6645 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Ideal Precision Meter Co Dba Ideal Precision Meter Co. Government technical data includes 23 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN6645-00-940-0759
Primary Part NumberHD654
Item NameMeter,time Totalizing
FSC / FSG6645 / 66 — No Item Name Available
ManufacturerIdeal Precision Meter Co Dba Ideal Precision Meter Co
StatusCANCELLED
Terminal Quantity2
Current TypeAC
Mounting TypePANEL
Operating Frequency400.0 HERTZ NOMINAL
Voltage Rating120.0 VOLTS NOMINAL
Mounting ConfigurationTHREE 0.150 IN. DIA MTG HOLES ON A 1.580 IN. RADIUS SPACED 120 DEG APART IN
Mounting Flange Diameter3.500 INCHES MAXIMUM IN
Electrical Movement TypeSYNCHRONOUS MOTOR
Smallest Increment Indicated0.10
Movement TypeELECTRICAL
Background ColorBLACK BACKGROUND ON HR WHEELS,WHITE BACKGROUND ON TENTHS WHEEL
Indicator TypeDRUM REGISTER
Maximum Measurement9999.90
Unit TypeMOUNTED
Hermetic ProtectionNOT PROVIDED
Reset FeatureNOT PROVIDED
Measurement UnitHOURS
Body Depth3.000 INCHES MAXIMUM IN
Marking ColorWHITE NUMERALS FOR HOURS,BLACK NUMERALS FOR TENTHS
Reference Number Differentiating CharacteristicsAS DIFFERENTIATED BY MARKING COLOR; BACKGROUNDCOLOR; VOLTAGE RATING; OPERATING FREQUENCY
Mounting MethodFLUSH
Body Diameter2.625 INCHES MAXIMUM IN
Terminal TypeSOLDER LUG OR STUD
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 1
6645-01-280-2674 INTERCHANGEABLE
Meter,time Totalizing
Cross-Reference Index
Part NumberManufacturer
HD654 Ideal Precision Meter Co Dba Ideal Precision Meter Co (USA)
MS16972-2 Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
6645-01-280-2674INTERCHANGEABLE
METER,TIME TOTALIZING

Frequently Asked Questions

What is NSN 6645-00-940-0759?

NSN 6645-00-940-0759 is a Meter,time Totalizing, manufactured by Ideal Precision Meter Co Dba Ideal Precision Meter Co, classified under FSC 6645 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 6645-00-940-0759?

NSN 6645-00-940-0759 has 2 cross-referenced part numbers: HD654 (Ideal Precision Meter Co Dba Ideal Precision Meter Co), MS16972-2 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 6645-00-940-0759?

There is 1 known substitute for 6645-00-940-0759: 6645-01-280-2674. Verify interchangeability with system specifications before substitution.

What are the specifications of HD654?

Key specifications for HD654: Terminal Quantity: 2; Current Type: AC; Mounting Type: PANEL; Operating Frequency: 400.0 HERTZ NOMINAL. 23 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6645-00-940-0759 still in active supply?

NSN 6645-00-940-0759 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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