Optical Parallel Set # 157-903

157-903 Mitutoyo 4-Piece Optical Parallel Set

The Mitutoyo 157-903 optical parallel set has the following specifications:

• Thicknesses: 12.00mm, 12.12mm, 12.25mm, 12.37mm
• Range of Micrometer to be Checked: 0-25mm
• Diameter: 30mm

Features:

• Designed to inspect parallelism and flatness of measuring faces of micrometers
• Optical parallels are offered as individual or as sets.  Each set consists for 4 different thickness optical parallels. 
• Supplied in fitted wooden case.

Technical Data

• Flatness: 0.1�m / .000004"
• Parallelism: 0.2�m / .000008"
• Diameter: 30mm / 1.18"

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 1�m (0.32�m x 3 = 0.96�m).
• Fringe on the anvil side must not be more than one.

Mitutoyo Individual Optical Parallels and Optical Parallel Sets:

0-25mm Range:

• 157-101 Optical Parallel: 12.00mm
• 157-102 Optical Parallel: 12.12mm
• 157-103 Optical Parallel: 12.25mm
• 157-104 Optical Parallel: 12.37mm

• 157-903 4-Piece Optical Parallel Set: 12.00mm, 12.12mm, 12.25mm, 12.37mm

25-50mm Range:

• 157-105 Optical Parallel: 25.00mm
• 157-106 Optical Parallel: 25.12mm
• 157-107 Optical Parallel: 25.25mm
• 157-108 Optical Parallel: 25.37mm

• 157-904 4-Piece Optical Parallel Set: 25.00mm, 25.12mm, 25.25mm, 25.37mm

0-1" Range:

• 157-109 Optical Parallel: .5000"
• 157-110 Optical Parallel: .5062"
• 157-111 Optical Parallel: .5125"
• 157-112 Optical Parallel: .5187"

• 157-901 4-Piece Optical Parallel Set: .5000", .5062", .5125", .5187"

1-2" Range:

• 157-113 Optical Parallel: 1.0000"
• 157-114 Optical Parallel: 1.0062"
• 157-115 Optical Parallel: 1.0125"
• 157-116 Optical Parallel: 1.0187"

• 157-902 4-Piece Optical Parallel Set: 1.0000", 1.0062", 1.0125", 1.0187"