Mitutoyo Optical Parallel B 157-904

Description

157-904 Mitutoyo 4-Piece Optical Parallel Set

The Mitutoyo 157-904 optical parallel set has the following specifications:

Thicknesses: 25.00mm, 25.12mm, 25.25mm, 25.37mm
Range of Micrometer to be Checked: 25-50mm
Diameter: 30mm
Features:

Designed to inspect parallelism and flatness of measuring faces of micrometers
Available in Metric or Inch
Parallels are offered as individuals or as a set
Each set of parallels consists of 4 thicknesses
Constructed of highly polished, lapped optical-grade glass
Inspects the flatness of metal, ceramic and other materials
Supplied in a fitted wooden case
The Mitutoyo 157-904 optical parallel set is constructed of optical-grade glass and can measure the parallelism and flatness of a micrometer’s measuring face. When used with a monochromatic light, a Mitutoyo optical parallel can determine the measuring surface parallelism within 0.2µm/.000008” and flatness within 0.1µm/.000004” on micrometers. Our optical parallels are precision polished and lapped for exceptional flatness in our Japanese factories.

Technical Data

Flatness: 0.1µm
Parallelism: 0.2µm
Parallelism check between measuring faces by means of interference fringe produced by an optical parallel.

The parallelism between the measuring faces can be determined as follows:

Place the optical parallel to the anvil and observe the number of interference fringes produced on the spindle side under the measuring force of the micrometers.
The parallelism is about 1µm (0.32µm x 3 = 0.96µm).
Fringe on the anvil side must not be more than one.