Features: br new Thread plug gauge is a tool to measure the correctness of internal thread size Thread plug gauge under 100mm is taper shank thread plug gauge Thread plug gauge 100 mm above is double screw thread plug gauge Easy to operate maintain, supercor performance Specification: Material: Bearing steel Weight: 14-221g/0 5-7 8oz Model: M10 25, M1 20 25, M1 60 35, M1 80 35, M20 4, M2 50 45, M30 5, M40 7, M50 8, M61 0, M81 25, M101 5, M121 75, M142 0, M162 0, M202 5 (Optional) Inspection measurement process 1 First, clean sheets impurities must be cleaned before the thread plug gauge the measured thread are positive, then the thumb forefinger rotate the ring gauge, so that the thread in the free state can be determined according to the full length of the thread, otherwise it will not be able to determine 2 After the use of the relevant inspection metrological institutions inspection metrology qualified, then the screw plug gauge the measured thread pair after, use the thumb finger the index finger rotation ring gauge, screw thread length within 2 pitch to be qualified, otherwise be judged to be non-conforming product Package List: 1 Thread Plug Gauge Note: 1 Before use: Thread plug gauge should be checked qualified by relevant inspection metrological institutions before being put into production site use 2 Use: should pay attention to the test thread tolerance class deviation code thread plug gauge mark tolerance class, the deviation code is the same 3 After the thread plug gauge is finished, clean measure part of the attachment should be cleaned stored in the specified quantity box The production site should be placed in the position of the craft fixed position light gently, so as to prevent the bump damage the measuring surface It is strictly forbidden to force screw threads into threads as cutting tools to avoid early wear ensure the accuracy of measuring tools Note: Please note that the new type old type of this product will be sent romly, make sure you will not mind before ordering