PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

BIFM4-275R 75Bifocal Mold,metal Front

Opticast Inc · NSN 6540-01-517-0831 · FSC 6540 · No Item Name Available
Verified by PartsTable
NSN 6540-01-517-0831 — this item is cataloged by the U.S. Government under National Stock Number 6540-01-517-0831. Primary manufacturer part number: BIFM4-275R 75.
Features
  • Bifocal Mold,metal Front — FSC 6540
  • 3 verified cross-references
  • Primary manufacturer: Opticast Inc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Bifocal Mold,metal Front, cataloged under National Stock Number 6540-01-517-0831, 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. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN6540-01-517-0831
Primary Part NumberBIFM4-275R 75
Item NameBifocal Mold,metal Front
FSC / FSG6540 / 65 — No Item Name Available
ManufacturerOpticast Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Unit of IssueEA
Verified Substitutes 2
5905-00-546-9060P2477-7 INTERCHANGEABLE
Resistor,variable,wire Wound,non
L3 Technologies, Inc. Div L3 Keo
5905-01-096-6054032700 INTERCHANGEABLE
Resistor,variable,wire Wound,non
L3 Technologies, Inc. Div L3 Keo
Cross-Reference Index
Part NumberManufacturer
6540NCM032319 Defense Medical Standardization Board (USA)
03-2700 Defense Logistics Agency Directorate of Medical Materiel Defense Supply Center Philadelphia (USA)
BIFM4-275R 75 PRIMARY Opticast Inc (USA)
Related Parts
5905-00-546-9060INTERCHANGEABLE
RESISTOR,VARIABLE,WIRE WOUND,NON
P2477-7
5905-01-096-6054INTERCHANGEABLE
RESISTOR,VARIABLE,WIRE WOUND,NON
032700

Frequently Asked Questions

What is NSN 6540-01-517-0831?

NSN 6540-01-517-0831 is a Bifocal Mold,metal Front, manufactured by Opticast Inc, classified under FSC 6540 (No Item Name Available). Status: active.

What are the part numbers for NSN 6540-01-517-0831?

NSN 6540-01-517-0831 has 3 cross-referenced part numbers: 6540NCM032319 (Defense Medical Standardization Board), 03-2700 (Defense Logistics Agency Directorate of Medical Materiel Defense Supply Center Philadelphia), BIFM4-275R 75 (Opticast Inc).

What NSN replaces 6540-01-517-0831?

There are 2 known substitutes for 6540-01-517-0831: 5905-00-546-9060, 5905-01-096-6054. Verify interchangeability with system specifications before substitution.

What are the specifications of BIFM4-275R 75?

Key specifications for BIFM4-275R 75: Part Name Assigned by Controlling Agency: METAL FRONT BIFOCAL MOLD 4-275R 75; Special Features: REPLACEMENT COMPONENT FOR THE BIFOCAL VISION MOLD SET,NSN: 6540-01-505-3502, PART NUMBER: MBIFS54-65,FOR MAKING PLASTIC LENS; METAL MATERIAL; 75MM DIAM. MM. 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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