PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

POLY+SPH68MMSM025.000Lens,ophthalmic,compound

Allan Baker, Inc. · NSN 6540-01-646-0517 · FSC 6540 · No Item Name Available
Verified by PartsTable
NSN 6540-01-646-0517 — this item is cataloged by the U.S. Government under National Stock Number 6540-01-646-0517. Primary manufacturer part number: POLY+SPH68MMSM025.000.
Features
  • Lens,ophthalmic,compound — FSC 6540
  • Light Transmission: UNTINTED
  • Diameter: 68.000 MILLIMETERS NOMINAL MM
  • 3 verified cross-references
  • Primary manufacturer: Allan Baker, Inc.
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Lens,ophthalmic,compound, cataloged under National Stock Number 6540-01-646-0517, is classified within Federal Supply Class 6540 (No Item Name Available) of the Medical, Dental, and Veterinary Equipment group. The primary manufacturer of record is Allan Baker, Inc.. Government technical data includes 2 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. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: PR.

Technical Specifications
ParameterValue
NSN6540-01-646-0517
Primary Part NumberPOLY+SPH68MMSM025.000
Item NameLens,ophthalmic,compound
FSC / FSG6540 / 65 — No Item Name Available
ManufacturerAllan Baker, Inc.
StatusACTIVE
Light TransmissionUNTINTED
Diameter68.000 MILLIMETERS NOMINAL MM
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Unit of IssuePR
Verified Substitutes 1
5999-01-081-4882134626-0001 INTERCHANGEABLE
Delay Line
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
Cross-Reference Index
Part NumberManufacturer
6540NCM152185 Defense Medical Standardization Board (USA)
1346261 Defense Logistics Agency Directorate of Medical Materiel Defense Supply Center Philadelphia (USA)
POLY+SPH68MMSM025.000 PRIMARY Allan Baker, Inc. (USA)
Related Parts
5999-01-081-4882INTERCHANGEABLE
DELAY LINE
134626-0001

Frequently Asked Questions

What is NSN 6540-01-646-0517?

NSN 6540-01-646-0517 is a Lens,ophthalmic,compound, manufactured by Allan Baker, Inc., classified under FSC 6540 (No Item Name Available). Status: active.

What are the part numbers for NSN 6540-01-646-0517?

NSN 6540-01-646-0517 has 3 cross-referenced part numbers: 6540NCM152185 (Defense Medical Standardization Board), 1346261 (Defense Logistics Agency Directorate of Medical Materiel Defense Supply Center Philadelphia), POLY+SPH68MMSM025.000 (Allan Baker, Inc.).

What NSN replaces 6540-01-646-0517?

There is 1 known substitute for 6540-01-646-0517: 5999-01-081-4882. Verify interchangeability with system specifications before substitution.

What are the specifications of POLY+SPH68MMSM025.000?

Key specifications for POLY+SPH68MMSM025.000: Part Name Assigned by Controlling Agency: LENS, FSV, POLY, + SPH, 68MM, 025.000 MM; Light Transmission: UNTINTED; Diameter: 68.000 MILLIMETERS NOMINAL MM; Special Features: LENS; FINISHED SINGLE VISION; POLYCARBONATE; POSITIVE ON MINUS; DIAMETER OF LENS, 68MM; 025.000; MANUFACTURE (SOMO OPTICAL, LLC) DOES NOT SELL TO THE GOVERNMENT AND DOESN'T HAVE A CAGE CODE; ITEM IS PURCHASED FROM AUTHORIZED DISTRIBUTOR MM. 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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