PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-T-4748Calibrator,thermometer

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 6685-00-808-1984 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-808-1984 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-808-1984. Primary manufacturer part number: MIL-T-4748.
Features
  • Calibrator,thermometer — FSC 6685
  • Frequency Rating: 60.0 HERTZ NOMINAL
  • Calibration Accuracy Rating: ACCURACY +/- 1 DEG C DEGC
  • Functional Description: USED FOR TESTING AND CALIBRATING AIRCRAFT TEMPERATURE INSTRUMENTS
  • Reference Data and Literature: T.O. 33D2-6-108-4
  • Material: STEEL
  • Shape: SQUARE
  • Surface Treatment: CADMIUM
Applications
  • Applications requiring Steel construction
General Description

The Calibrator,thermometer, cataloged under National Stock Number 6685-00-808-1984, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6685-00-808-1984
Primary Part NumberMIL-T-4748
Item NameCalibrator,thermometer
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Frequency Rating60.0 HERTZ NOMINAL
Calibration Accuracy RatingACCURACY +/- 1 DEG C DEGC
Functional DescriptionUSED FOR TESTING AND CALIBRATING AIRCRAFT TEMPERATURE INSTRUMENTS
Reference Data and LiteratureT.O. 33D2-6-108-4
MaterialSTEEL
ShapeSQUARE
Surface TreatmentCADMIUM
Supplementary FeaturesMANUFACTURERS NAME: INSTRUMENT TEMPERATURE TESTER
Calibration TypeDEG CELSIUS
AC Voltage Rating110.0 VOLTS NOMINAL
Unpackaged Unit Weight250.000 POUNDS LBS
Instrument Calibration RangeRANGE OF -51 DEG C TO +177 DEG C DEGC
Furnished Items and Quantity1 GROUNDED 3 CONDUCTER EXTENSION POWER CABLE; 2 QUARTS OF LIQUID FOR THE TEMPERATURE BATH; NECESSARY TOOLS AND FREON CHARGING TUBE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
6685-00-092-7953 INTERCHANGEABLE
Calibrator,thermometer
5935-00-233-9491491813 INTERCHANGEABLE
Plug,telephone
Naval Ship Systems Command
6685-00-530-3614 INTERCHANGEABLE
Indicator,temperature,thermocoup
6685-00-782-4291915LW INTERCHANGEABLE
Calibrator,thermometer
E.m.a. Instruments, Inc. Dba E M a
5999-01-210-6418 INTERCHANGEABLE
Contact,electrical
6605-01-547-3844PJ-1 INTERCHANGEABLE
Plotter-Protractor,air Navigatio
Boeing Digital Solutions, Inc.
Cross-Reference Index
Part NumberManufacturer
MIL-T-4748 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MJ-1 Department of the Air Force (USA)
PJ1 Production Control Units, Inc Div Production Control Units, Inc. (USA)
Related Parts
6685-00-092-7953INTERCHANGEABLE
CALIBRATOR,THERMOMETER
5935-00-233-9491INTERCHANGEABLE
PLUG,TELEPHONE
491813
6685-00-530-3614INTERCHANGEABLE
INDICATOR,TEMPERATURE,THERMOCOUP
6685-00-782-4291INTERCHANGEABLE
CALIBRATOR,THERMOMETER
915LW
5999-01-210-6418INTERCHANGEABLE
CONTACT,ELECTRICAL
6605-01-547-3844INTERCHANGEABLE
PLOTTER-PROTRACTOR,AIR NAVIGATIO
PJ-1

Frequently Asked Questions

What is NSN 6685-00-808-1984?

NSN 6685-00-808-1984 is a Calibrator,thermometer, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-00-808-1984?

NSN 6685-00-808-1984 has 3 cross-referenced part numbers: MIL-T-4748 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MJ-1 (Department of the Air Force), PJ1 (Production Control Units, Inc Div Production Control Units, Inc.).

What NSN replaces 6685-00-808-1984?

There are 6 known substitutes for 6685-00-808-1984: 6685-00-092-7953, 5935-00-233-9491, 6685-00-530-3614 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-T-4748?

Key specifications for MIL-T-4748: Frequency Rating: 60.0 HERTZ NOMINAL; Calibration Accuracy Rating: ACCURACY +/- 1 DEG C DEGC; Functional Description: USED FOR TESTING AND CALIBRATING AIRCRAFT TEMPERATURE INSTRUMENTS; Reference Data and Literature: T.O. 33D2-6-108-4. 17 total characteristics are documented in the Federal Logistics Information System.

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