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Semifinished Bifocal Ophthalmic Lens Blank

NSN: 6540-00-104-4988 | Model: MILL16991

A transparent optical element consisting of a major blank and a bifocal segment. The blank and segment have been pressed in a glass mold to an approximate size and shape, and are ground and polished to a finished diopter curvature on one surface only.

NSN Properties and Flags
NATO Stock Number
Cross Sectional Shape
65.0 millimeters
Any acceptable
Material And Location
Glass, soda-lime single vision and glass, barium bifocal
Additional Power Rating In Diopters
1.750 bifocal
Reading Segment Diameter
25.0 millimeters
Reading Segment Height
17.5 millimeters
Base Curve Diopter
8.25 plus
Cross Curve Diopter
Any acceptable
Light Transmission
Sphere Curve Inside Diopter
Any acceptable
Sphere Curve Outside Diopter
Any acceptable
Part Name Assigned By Controlling Agency
Lens blank ophthalmic semifinished bifocal plus 8.25-plus 1.75
Exterior Container Weight
45.00 pounds
Exterior Container Cubic Measure
1.100 cubic feet
Exterior Container Quantity
Intermediate Package Quantity
Style Designator
Round with straight top bifocal segment
Unit Of Issue Cube
0.0061 cubic feet
Supplementary Features
Suitable for coating; for use w/aviation spectacle frames
Unit Of Issue Weight
0.25 pounds
Nondefinitive Specification/std Data
1 type and a class
Departure From Cited Designator
As modified by diameter

Pricing and Availability

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NSN 6540-00-104-4988 Datasheet

Supply Class (FSC):
Supplies Equipment Ophthalmic Instruments
Cross Reference:
  • MILL16991
Cage Codes:
  • Military Specifications (CAGE 81349)
Schedule B & Trade:
  • Schedule B: 7014001000 (NAICS 327212)

    Lens blanks (other than for spectacles) not optically worked, of glass, (optical elements)

  • SITC: 66595

    Signalling glassware and optical elements of glass (other than elements for spectacles) not optically worked

  • End Use: 12770

    Other industrial supplies


N - Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.


A - Item does not contain precious metal.


- The item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.

Freight Information:
  • NMFC:

    057940 - Lenses optical noi

  • WCC:

    744 - Optical goods

  • SHC:

    9 - Other or no special handling required (sh)

  • ADC:

    A - Shipment is not a consolidation and does not exceed 84 inches in any dimension.

  • ACC:

    M - Medical supplies, equipment, samples, records, etc.

  • LTL:

    W - Rating variable

  • TCC:

    Z - No special type of cargo code applicable

NSN Management Codes:
  • SOS
  • AAC
  • Quantity per pack
  • Unit of Measure
  • Shelf Life
  • Classification Control
  • Repariability

Questions & Answers:

What are the historical prices recorded for this stock number?
Historical data shows pricing from $32.81 to $54.68..
Does NSN 6540-00-104-4988 have a shelf life?
No. There is no shelf life applicable for this NSN.
What NATO entities are users of this NSN?
No recorded entities for this stock number.
What is the NIIN of NSN 6540-00-104-4988?
001044988 or 00-104-4988
Does NSN 6540-00-104-4988 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 6540-00-104-4988?
No solicitations for this NSN.
When was this national stock number assigned to the federal catalog?
Jun 26, 1968