PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

M3971/1-6-SMeter,time Totalizing

Maxima Technologies & Systems Llc · NSN 6645-00-864-6794 · FSC 6645 · No Item Name Available
Verified by PartsTable
NSN 6645-00-864-6794 — this item is cataloged by the U.S. Government under National Stock Number 6645-00-864-6794. Primary manufacturer part number: M3971/1-6-S.
Features
  • Meter,time Totalizing — FSC 6645
  • Smallest Increment Indicated: 0.10
  • Background Color: BLACK BACKGROUND ON HR WHEELS,WHITE BACKGROUND ON TENTHS WHEEL
  • Electrical Movement Type: MAGNETIC
  • Measurement Unit: HOURS
  • Body Depth: 3.000 INCHES MAXIMUM IN
  • Mounting Flange Diameter: 2.875 INCHES MAXIMUM IN
  • Movement Type: ELECTRICAL
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Meter,time Totalizing, cataloged under National Stock Number 6645-00-864-6794, is classified within Federal Supply Class 6645 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Maxima Technologies & Systems Llc. Government technical data includes 22 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 30 commercial cross-references from 10 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN6645-00-864-6794
Primary Part NumberM3971/1-6-S
Item NameMeter,time Totalizing
FSC / FSG6645 / 66 — No Item Name Available
ManufacturerMaxima Technologies & Systems Llc
StatusCANCELLED
Smallest Increment Indicated0.10
Background ColorBLACK BACKGROUND ON HR WHEELS,WHITE BACKGROUND ON TENTHS WHEEL
Electrical Movement TypeMAGNETIC
Measurement UnitHOURS
Body Depth3.000 INCHES MAXIMUM IN
Mounting Flange Diameter2.875 INCHES MAXIMUM IN
Movement TypeELECTRICAL
Indicator TypeDRUM REGISTER
Voltage Rating40.0 VOLTS MINIMUM AND 130.0 VOLTS MAXIMUM
Maximum Measurement9999.90
Unit TypeMOUNTED
Marking ColorWHITE NUMERALS FOR HOURS,BLACK NUMERALS FOR TENTHS
Nondefinitive Spec/std DataB GRADE AND 1 TYPE
Hermetic ProtectionNOT PROVIDED
Reset FeatureNOT PROVIDED
Mounting MethodFLUSH
Mounting ConfigurationTHREE 0.150 IN. DIA MTG HOLES ON 1.265 IN. RADIUS SPACED 120 DEG APART IN
Body Length2.210 INCHES MAXIMUM IN
Terminal TypeSOLDER LUG OR STUD
Terminal Quantity2
Current TypeDC
Mounting TypePANEL
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
6645-00-089-8842 INTERCHANGEABLE
Meter,time Totalizing
3110-00-117-090170132 INTERCHANGEABLE
Retainer,ball,bearing
L3harris Technologies, Inc Div Space & Airborne Systems
6645-00-151-5280 INTERCHANGEABLE
Meter,time Totalizing
5340-00-155-51851507000 INTERCHANGEABLE
Cap,protective,dust and Moisture
Titan Distribution Inc Dba Titan Tire
5120-00-181-687856040 INTERCHANGEABLE
Wrench,relay Contac
General Dynamics Mission Systems, Inc.
5895-00-226-5985 INTERCHANGEABLE
Panel,indicator
5120-00-230-78921648807 INTERCHANGEABLE
Adjuster,spring,communications E
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
2920-00-247-6663MBP4018T INTERCHANGEABLE
Starter,engine,electrical
Prestolite Electric Inc
5133-00-266-9230 INTERCHANGEABLE
Drill,twist
6730-00-398-2460 INTERCHANGEABLE
Plate,film Stripper
Cross-Reference Index
Part NumberManufacturer
7013 Landoll Corporation Dba Landoll Corporation Drexel Division Div Drexel (USA)
85315 Hobbs Corp (USA)
56040 Hamilton Watch Co Inc (USA)
199001 Taltronics Corp Sub of Talley Industries Co (USA)
M571S40-130DCNB Maxima Technologies & Systems Llc (USA)
M3971/1-6-S Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
56007-2-03 Maxima Technologies & Systems Llc (USA)
899300 Taltronics Corp Sub of Talley Industries Co (USA)
M571S40-130DCNB Hamilton Watch Co Inc (USA)
M571-40-130DCNB Hamilton Watch Co Inc (USA)
MH10008 Mancraft Industries Inc (USA)
M3971/1-6 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-M-3971 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
M571-40-130DCNB Maxima Technologies & Systems Llc (USA)
MM-2-6 Pettibone Llc (USA)
7013-2 Landoll Corporation Dba Landoll Corporation Drexel Division Div Drexel (USA)
56040 Maxima Technologies & Systems Llc (USA)
56041 Maxima Technologies & Systems Llc (USA)
M3971/1-6-S PRIMARY Maxima Technologies & Systems Llc (USA)
MIL-DTL-3971 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
6645-00-089-8842INTERCHANGEABLE
METER,TIME TOTALIZING
3110-00-117-0901INTERCHANGEABLE
RETAINER,BALL,BEARING
70132
6645-00-151-5280INTERCHANGEABLE
METER,TIME TOTALIZING
5340-00-155-5185INTERCHANGEABLE
CAP,PROTECTIVE,DUST AND MOISTURE
1507000
5120-00-181-6878INTERCHANGEABLE
WRENCH,RELAY CONTAC
56040
5895-00-226-5985INTERCHANGEABLE
PANEL,INDICATOR
5120-00-230-7892INTERCHANGEABLE
ADJUSTER,SPRING,COMMUNICATIONS E
1648807
2920-00-247-6663INTERCHANGEABLE
STARTER,ENGINE,ELECTRICAL
MBP4018T
5133-00-266-9230INTERCHANGEABLE
DRILL,TWIST
6730-00-398-2460INTERCHANGEABLE
PLATE,FILM STRIPPER
5930-00-421-7820INTERCHANGEABLE
SWITCH,CODE INDICATING WHEEL
365472-1
6645-00-557-0159INTERCHANGEABLE
METER,TIME TOTALIZING
571-24DCNB

Frequently Asked Questions

What is NSN 6645-00-864-6794?

NSN 6645-00-864-6794 is a Meter,time Totalizing, manufactured by Maxima Technologies & Systems Llc, classified under FSC 6645 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 6645-00-864-6794?

NSN 6645-00-864-6794 has 30 cross-referenced part numbers: 7013 (Landoll Corporation Dba Landoll Corporation Drexel Division Div Drexel), 85315 (Hobbs Corp), 56040 (Hamilton Watch Co Inc), 199001 (Taltronics Corp Sub of Talley Industries Co), M571S40-130DCNB (Maxima Technologies & Systems Llc) and 25 more.

What NSN replaces 6645-00-864-6794?

There are 12 known substitutes for 6645-00-864-6794: 6645-00-089-8842, 3110-00-117-0901, 6645-00-151-5280 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of M3971/1-6-S?

Key specifications for M3971/1-6-S: Smallest Increment Indicated: 0.10; Background Color: BLACK BACKGROUND ON HR WHEELS,WHITE BACKGROUND ON TENTHS WHEEL; Part Name Assigned by Controlling Agency: METER TIME TOTALIZING DRUM REGISTER 40/130V AC 2 TERMINAL V; Electrical Movement Type: MAGNETIC. 23 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6645-00-864-6794 still in active supply?

NSN 6645-00-864-6794 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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