MITUTOYO SERIES 157-OPTICAL PARALLELS

• Designed to inspect parallelism and flatness of measuring faces of micrometers. For
  details, refer to “Quick Guide to Precision Measuring Instruments”on page 13-9.
• Each set consists of 4 sizes to enable testing parallelism at quarter-turn positions of the micrometer spindle.

SPECIFICATIONS

Metric
Code No.	Range of micrometer to be checked (mm)	Sizes of parallels included in set (mm)	Diameter (mm)	Flatness (µm)	Parallelism (µm)	Parallelism (µm)
157-903	0 – 25	12.00, 12.12, 12.25, 12.37	ø30	0.1	0.2	For 25
157-904	25 – 50	25.00, 25.12, 25.25, 25.37				For 50

 

Inch
Code No.	Range of micrometer to be checked (mm)	Sizes of parallels included in set(mm)	Diameter (mm)	Flatness (µm)	Parallelism (µm)	Parallelism (µm)
157-901	0 – 1	0.5000, 0.5062, 0.5125, 0.5187	ø30	0.1	0.2	For 25
157-902	1 – 2	1.0000, 1.0062, 1.0125, 1.0187				For 50

Note: Also available individually, using the following Code No.

Metri
Code No.	Thickness (mm)
157-101	12.00
157-102	12.12
157-103	12.25
157-104	12.37
157-105	25.00
157-106	25.12
157-107	25.25
157-108	25.37

 

Inch
Code No.	Thickness (in)
157-109	0.5000
157-110	0.5062
157-111	0.5125
157-112	0.5187
157-113	1.0000
157-114	1.0062
157-115	1.0125
157-116	1.0187