PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

257ATest Set,optical Power

Greenlee Tools, Inc. Dba Greenlee Textron Tempo Operation · NSN 6650-01-513-2644 · FSC 6650 · No Item Name Available
Verified by PartsTable
NSN 6650-01-513-2644 — this item is cataloged by the U.S. Government under National Stock Number 6650-01-513-2644. Primary manufacturer part number: 257A.
Features
  • Test Set,optical Power — FSC 6650
  • Width: 2.800 INCHES NOMINAL IN
  • Test Type for Which Designed: INSERTION LOSS
  • Enclosure Feature: SINGLE ITEM W/HOUSING
  • Thickness: 1.400 INCHES NOMINAL IN
  • Length: 15.600 INCHES NOMINAL IN
  • 1 verified cross-reference
  • Primary manufacturer: Greenlee Tools, Inc. Dba Greenlee Textron Tempo Operation
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Test Set,optical Power, cataloged under National Stock Number 6650-01-513-2644, is classified within Federal Supply Class 6650 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Greenlee Tools, Inc. Dba Greenlee Textron Tempo Operation. Government technical data includes 5 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6650-01-513-2644
Primary Part Number257A
Item NameTest Set,optical Power
FSC / FSG6650 / 66 — No Item Name Available
ManufacturerGreenlee Tools, Inc. Dba Greenlee Textron Tempo Operation
StatusACTIVE
Width2.800 INCHES NOMINAL IN
Test Type for Which DesignedINSERTION LOSS
Enclosure FeatureSINGLE ITEM W/HOUSING
Thickness1.400 INCHES NOMINAL IN
Length15.600 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
5950-00-189-5765 INTERCHANGEABLE
Coil,telephone
5210-00-242-3898257A INTERCHANGEABLE
Gage,surface
L.s. Starrett Company (the) Div Tool Division
Cross-Reference Index
Part NumberManufacturer
257A Greenlee Tools, Inc. Dba Greenlee Textron Tempo Operation (USA)
Related Parts
5950-00-189-5765INTERCHANGEABLE
COIL,TELEPHONE
5210-00-242-3898INTERCHANGEABLE
GAGE,SURFACE
257A

Frequently Asked Questions

What is NSN 6650-01-513-2644?

NSN 6650-01-513-2644 is a Test Set,optical Power, manufactured by Greenlee Tools, Inc. Dba Greenlee Textron Tempo Operation, classified under FSC 6650 (No Item Name Available). Status: active.

What are the part numbers for NSN 6650-01-513-2644?

NSN 6650-01-513-2644 has 1 cross-referenced part number: 257A (Greenlee Tools, Inc. Dba Greenlee Textron Tempo Operation).

What NSN replaces 6650-01-513-2644?

There are 2 known substitutes for 6650-01-513-2644: 5950-00-189-5765, 5210-00-242-3898. Verify interchangeability with system specifications before substitution.

What are the specifications of 257A?

Key specifications for 257A: Special Features: CALIBRATED OUTPUT; CONTINUOUS WAVE AND MODULATED OUTPUT MODES; USER-SELECTABLE AUTO-SHUTOFF; RUGGED AND SPLASHPROOF; Width: 2.800 INCHES NOMINAL IN; Test Type for Which Designed: INSERTION LOSS; Enclosure Feature: SINGLE ITEM W/HOUSING. 6 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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