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Micrometers                                                                                                                       Technical Data

SERIES 313 – Three-Wire Units                                                                                                     Roundness: 		     0.5 m or less
                                                                                                                                  Cylindricity: 		  1 m or less
•	Enables measurement of the pitch diameter of screw threads with a standard micrometer.                                          Hardness: 		      63 to 66 HRC
•	Can be used for measuring the effective diameter of threads. (See Quick Guide to Micrometers at the	                            Accuracy:		       ±2 m
	 end of this section.)

B

                                                                                                             313-101

SPECIFICATIONS

Code No.             No. of units in set    Wire dia. range (mm)      Support spindle dia. (mm)                            Price
Three-Wire Unit set         18                  0.170-3.200                   6.35
313-101                                                                                                               2450.00

Code No.             Wire dia.            Metric (mm)       Thread type          Whitworth                                 Price
                      (mm)                                     Unified        (threads per inch)
                                                                                                                       139.00
                                                          (threads per inch)                                           139.00
                                                                                                                       139.00
One pair, support spindle 6.35 mm (.25")                                                                             139.00
                                                                                                                       139.00
952131               0.170                0.2, 0.25, 0.3      80                  —                                    139.00
                                                              72                  —                                    139.00
952132               0.195                  0.35              64                  —                                    139.00
                                                              56                  60                                   139.00
952133               0.220                  0.4               48                  48                                   139.00
                                                            44, 40                40                                   139.00
952134               0.250                  0.45              36                  36                                   139.00
                                                              32                  32                                   139.00
952135               0.290                  0.5               28                28, 26                                 139.00
                                                              24                24, 22                                 139.00
952136               0.335                  0.6               20              20, 19, 18                               139.00
                                                            18, 16                16                                   139.00
952137               0.390                  0.7           14, 13, 12            14, 12                                 139.00
                                                            11, 10              11, 10
952138               0.455                  0.75, 0.8        9, 8                9, 8
                                                              7                   7
952139               0.530                  0.9               6                   6
                                                            5, 4.5              5, 4.5
952140               0.620                  1.0

952141               0.725                  1.25

952142               0.895                  1.5

952143               1.100                  1.75, 2.0

952144               1.350                  2.5

952145               1.650                  3.0

952146               2.050                  3.5

952147               2.550                  4, 4.5

952148               3.200                  5, 5.5, 6

                                                    B-33                             Mitutoyo operates a policy of continuous improvement that aims to provide the customer with the benefit of the latest technological advances.
                                                                                                                   Therefore the company reserves the right to change any or all aspects of any product specification without notice.

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