Micrometers
Optical Parallels SERIES 157 • Designed to inspect parallelism and flatness of measuring faces of micrometers.
• Each set consists of 4 sizes to enable testing parallelism at quarter-turn positions of the micrometer spindle.
B
157-902
SPECIFICATIONS Inch Order No.
Range of micrometer to be checked (in)
Sizes of parallels included in set (in) 0.5000, 0.5062, 0.5125, 0.5187 1.0000, 1.0062, 1.0125, 1.0187 Sizes of parallels included in set (mm) 12.00, 12.12, 12.25, 12.37 25.00, 25.12, 25.25, 25.37
Diameter (mm)
Flatness (µm)
Parallelism (µm)
Remarks (mm)
157-901 157-902
0 - 1 1 - 2
For 25 For 50
ø30
0.1
0.2
Metric Order No.
Range of micrometer to be checked (mm)
Diameter (mm)
Flatness (µm)
Parallelism (µm)
Remarks (mm)
157-903 157-904
0 - 25 25 - 50
For 25 For 50
ø30
0.1
0.2
Note: Also available individually, using the following Order No.
Inch Order No.
Inch Order No.
Thickness (in)
Thickness (in)
157-109 157-110 157-111 157-112
157-113 157-114 157-115 157-116
0.5000 0.5062 0.5125 0.5187
1.0000 1.0062 1.0125 1.0187
Metric Order No.
Metric Order No.
Thickness (mm)
Thickness (mm)
157-101 157-102 157-103 157-104
157-105 157-106 157-107 157-108
12.00 12.12 12.25 12.37
25.00 25.12 25.25 25.37
Optical Flats SERIES 158
• Used for inspecting the flatness of measuring faces with high accuracy.
158-122
SPECIFICATIONS Inch Order No. Thickness (in)
Metric Order No.
Diameter (in)
Flatness (in)
Thickness (mm)
Diameter (mm)
Flatness (µm)
158-121 158-122 158-123 158-124
158-117 158-118 158-119 158-120
0.000008 0.000004 0.000008 0.000004
0.2 0.1 0.2 0.1
0.5
1.8
12
45
0.6
2.4
15
60
B-70
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