PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

31371Lens,optical Instrument

Cooper Surgical · NSN 6650-01-508-7811 · FSC 6650 · No Item Name Available
Verified by PartsTable
NSN 6650-01-508-7811 — this item is cataloged by the U.S. Government under National Stock Number 6650-01-508-7811. Primary manufacturer part number: 31371.
Features
  • Lens,optical Instrument — FSC 6650
  • 2 verified cross-references
  • Primary manufacturer: Cooper Surgical
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Lens,optical Instrument, cataloged under National Stock Number 6650-01-508-7811, is classified within Federal Supply Class 6650 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Cooper Surgical. 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
NSN6650-01-508-7811
Primary Part Number31371
Item NameLens,optical Instrument
FSC / FSG6650 / 66 — No Item Name Available
ManufacturerCooper Surgical
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 8
6610-00-476-10743137-1 INTERCHANGEABLE
Indicator Standoff
Kearflex Engineering Company
9540-00-596-3006 INTERCHANGEABLE
Angle,structural
5945-00-655-1705 INTERCHANGEABLE
Relay,electromagnetic
5935-00-833-09912678544 INTERCHANGEABLE
Connector,plug,electrical
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
4820-01-380-604531371 INTERCHANGEABLE
Disk,valve
Circor Aerospace, Inc. Dba Circor Aerospace Inc
5310-01-573-2088 INTERCHANGEABLE
Washer,flat
9150-01-574-621831-371 INTERCHANGEABLE
Grease,utility
Ideal Industries, Inc.
6515-01-582-80178154A-LR-3 INTERCHANGEABLE
Pad,crest,toe
Pedifix, Inc.
Cross-Reference Index
Part NumberManufacturer
LL-H56-2134 Naval Medical Material Support Command Detachment (USA)
31371 PRIMARY Cooper Surgical (USA)
Related Parts
6610-00-476-1074INTERCHANGEABLE
INDICATOR STANDOFF
3137-1
9540-00-596-3006INTERCHANGEABLE
ANGLE,STRUCTURAL
5945-00-655-1705INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
5935-00-833-0991INTERCHANGEABLE
CONNECTOR,PLUG,ELECTRICAL
2678544
4820-01-380-6045INTERCHANGEABLE
DISK,VALVE
31371
5310-01-573-2088INTERCHANGEABLE
WASHER,FLAT
9150-01-574-6218INTERCHANGEABLE
GREASE,UTILITY
31-371
6515-01-582-8017INTERCHANGEABLE
PAD,CREST,TOE
8154A-LR-3

Frequently Asked Questions

What is NSN 6650-01-508-7811?

NSN 6650-01-508-7811 is a Lens,optical Instrument, manufactured by Cooper Surgical, classified under FSC 6650 (No Item Name Available). Status: active.

What are the part numbers for NSN 6650-01-508-7811?

NSN 6650-01-508-7811 has 2 cross-referenced part numbers: LL-H56-2134 (Naval Medical Material Support Command Detachment), 31371 (Cooper Surgical).

What NSN replaces 6650-01-508-7811?

There are 8 known substitutes for 6650-01-508-7811: 6610-00-476-1074, 9540-00-596-3006, 5945-00-655-1705 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 31371?

Key specifications for 31371: End Item Identification: INDIRECT BINOCULAR OPTHMALMOSCOPE; Part Name Assigned by Controlling Agency: MINISCUS LENS FOR INDIRECT BINOCULAR OPTHALMOSCOPE. 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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