PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

G-3.8-125/150Gasket,optical

Opticast Inc · NSN 6540-01-516-0975 · FSC 6540 · No Item Name Available
Verified by PartsTable
NSN 6540-01-516-0975 — this item is cataloged by the U.S. Government under National Stock Number 6540-01-516-0975. Primary manufacturer part number: G-3.8-125/150.
Features
  • Gasket,optical — FSC 6540
  • 3 verified cross-references
  • Primary manufacturer: Opticast Inc
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
General Description

The Gasket,optical, cataloged under National Stock Number 6540-01-516-0975, 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 Opticast Inc. 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: EA.

Technical Specifications
ParameterValue
NSN6540-01-516-0975
Primary Part NumberG-3.8-125/150
Item NameGasket,optical
FSC / FSG6540 / 65 — No Item Name Available
ManufacturerOpticast Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Unit of IssueEA
Verified Substitutes 1
3010-00-177-3689 INTERCHANGEABLE
Gearcase-Motor
Cross-Reference Index
Part NumberManufacturer
G-3.8-125/150 PRIMARY Opticast Inc (USA)
03-2513 Defense Logistics Agency Directorate of Medical Materiel Defense Supply Center Philadelphia (USA)
6540NCM032147 Defense Medical Standardization Board (USA)
Related Parts
3010-00-177-3689INTERCHANGEABLE
GEARCASE-MOTOR

Frequently Asked Questions

What is NSN 6540-01-516-0975?

NSN 6540-01-516-0975 is a Gasket,optical, manufactured by Opticast Inc, classified under FSC 6540 (No Item Name Available). Status: active.

What are the part numbers for NSN 6540-01-516-0975?

NSN 6540-01-516-0975 has 3 cross-referenced part numbers: G-3.8-125/150 (Opticast Inc), 03-2513 (Defense Logistics Agency Directorate of Medical Materiel Defense Supply Center Philadelphia), 6540NCM032147 (Defense Medical Standardization Board).

What NSN replaces 6540-01-516-0975?

There is 1 known substitute for 6540-01-516-0975: 3010-00-177-3689. Verify interchangeability with system specifications before substitution.

What are the specifications of G-3.8-125/150?

Key specifications for G-3.8-125/150: Part Name Assigned by Controlling Agency: OPTICAL GASKET 3.8-125/150 FOR OPTICAL GASKET SET; Special Features: REPLACEMENT COMPONENT FOR THE STANDARD GASKET SET, NSN: 6540-01-507-3519. 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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