PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

ML74ARotor,psychrometer

Kahl Scientific Instrument Corporation · NSN 6685-00-223-6819 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-223-6819 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-223-6819. Primary manufacturer part number: ML74A.
Features
  • Rotor,psychrometer — FSC 6685
  • Overall Diameter: 3.375 INCHES NOMINAL IN
  • Drive Type: DIRECT
  • Nondefinitive Spec/std Data: ML-74-A TYPE
  • 2 verified cross-references
  • Primary manufacturer: Kahl Scientific Instrument Corporation
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Rotor,psychrometer, cataloged under National Stock Number 6685-00-223-6819, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Kahl Scientific Instrument Corporation. Government technical data includes 3 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. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6685-00-223-6819
Primary Part NumberML74A
Item NameRotor,psychrometer
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerKahl Scientific Instrument Corporation
StatusACTIVE
Overall Diameter3.375 INCHES NOMINAL IN
Drive TypeDIRECT
Nondefinitive Spec/std DataML-74-A TYPE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 8
5815-00-125-48737421 INTERCHANGEABLE
Bar,t,teletypewriter
Telemechanics Inc
5930-00-239-04167421 INTERCHANGEABLE
Switch,push-Pull
Cole Hersee Company
5305-00-484-69147421 INTERCHANGEABLE
Screw,machine
Triumph Engine Control Systems Llc
2520-00-972-2001 INTERCHANGEABLE
Parts Kit,seal and
5962-01-018-0116515C2008-24-020 INTERCHANGEABLE
Microcircuit,digital
Ge Aviation Systems Llc Dba Ge Aviation Div Information Systems - Germantown
5962-01-039-5037 INTERCHANGEABLE
Microcircuit,digital
4940-01-186-2860742-1 INTERCHANGEABLE
Adapter,test
General Dynamics Ots (aerospace), Inc. Dba General Dynamics Ordinance and Tactical Systems Div Seattle Operations
1005-01-225-38197421 INTERCHANGEABLE
Swivel,sling,small Arms
O F Mossberg & Sons Inc
Cross-Reference Index
Part NumberManufacturer
74-21 Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir (USA)
ML74A PRIMARY Kahl Scientific Instrument Corporation (USA)
Related Parts
5815-00-125-4873INTERCHANGEABLE
BAR,T,TELETYPEWRITER
7421
5930-00-239-0416INTERCHANGEABLE
SWITCH,PUSH-PULL
7421
5305-00-484-6914INTERCHANGEABLE
SCREW,MACHINE
7421
2520-00-972-2001INTERCHANGEABLE
PARTS KIT,SEAL AND
5962-01-018-0116INTERCHANGEABLE
MICROCIRCUIT,DIGITAL
515C2008-24-020
5962-01-039-5037INTERCHANGEABLE
MICROCIRCUIT,DIGITAL
4940-01-186-2860INTERCHANGEABLE
ADAPTER,TEST
742-1
1005-01-225-3819INTERCHANGEABLE
SWIVEL,SLING,SMALL ARMS
7421

Frequently Asked Questions

What is NSN 6685-00-223-6819?

NSN 6685-00-223-6819 is a Rotor,psychrometer, manufactured by Kahl Scientific Instrument Corporation, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-00-223-6819?

NSN 6685-00-223-6819 has 2 cross-referenced part numbers: 74-21 (Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir), ML74A (Kahl Scientific Instrument Corporation).

What NSN replaces 6685-00-223-6819?

There are 8 known substitutes for 6685-00-223-6819: 5815-00-125-4873, 5930-00-239-0416, 5305-00-484-6914 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of ML74A?

Key specifications for ML74A: Overall Diameter: 3.375 INCHES NOMINAL IN; Overall Length: 8.656 INCHES NOMINAL IN; Drive Type: DIRECT; Nondefinitive Spec/std Data: ML-74-A TYPE. 4 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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