PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

6535-3Tube,extension,borescope

Lenox Instrument Co., Inc. · NSN 6650-01-515-6139 · FSC 6650 · No Item Name Available
Verified by PartsTable
NSN 6650-01-515-6139 — this item is cataloged by the U.S. Government under National Stock Number 6650-01-515-6139. Primary manufacturer part number: 6535-3.
Features
  • Tube,extension,borescope — FSC 6650
  • 1 verified cross-reference
  • Primary manufacturer: Lenox Instrument Co., Inc.
Applications
  • Fluid conveyance
  • Hydraulic system plumbing
  • Pneumatic line routing
General Description

The Tube,extension,borescope, cataloged under National Stock Number 6650-01-515-6139, is classified within Federal Supply Class 6650 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Lenox Instrument Co., Inc.. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6650-01-515-6139
Primary Part Number6535-3
Item NameTube,extension,borescope
FSC / FSG6650 / 66 — No Item Name Available
ManufacturerLenox Instrument Co., Inc.
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
4820-00-469-66153712M2Y INTERCHANGEABLE
Valve,globe
Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok
5360-01-285-4784A65353 INTERCHANGEABLE
Spring,helical,compression
Leslie Controls, Inc. Dba Leslie Controls Inc
7510-01-392-52837510-00-NIB-9826 INTERCHANGEABLE
Binder,loose-Leaf
South Texas Lighthouse for the Blind Foundation Dba South Texas Lighthouse for the Blind
5305-01-416-275265353 INTERCHANGEABLE
Screw,machine
Colt's Manufacturing Company, Llc
Cross-Reference Index
Part NumberManufacturer
6535-3 PRIMARY Lenox Instrument Co., Inc. (USA)
Related Parts
4820-00-469-6615INTERCHANGEABLE
VALVE,GLOBE
3712M2Y
5360-01-285-4784INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
A65353
7510-01-392-5283INTERCHANGEABLE
BINDER,LOOSE-LEAF
7510-00-NIB-9826
5305-01-416-2752INTERCHANGEABLE
SCREW,MACHINE
65353

Frequently Asked Questions

What is NSN 6650-01-515-6139?

NSN 6650-01-515-6139 is a Tube,extension,borescope, manufactured by Lenox Instrument Co., Inc., classified under FSC 6650 (No Item Name Available). Status: active.

What are the part numbers for NSN 6650-01-515-6139?

NSN 6650-01-515-6139 has 1 cross-referenced part number: 6535-3 (Lenox Instrument Co., Inc.).

What NSN replaces 6650-01-515-6139?

There are 4 known substitutes for 6650-01-515-6139: 4820-00-469-6615, 5360-01-285-4784, 7510-01-392-5283 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 6535-3?

Key specifications for 6535-3: End Item Identification: BOILER INSPECTION DEVICE; Special Features: 34 IN WORKING LENGTH IN. 2 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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