Test method for cast iron square tube
Test method for cast iron square tube : For a square tube with a side length of 300 mm and below, a 1 mm gauge block is placed on both ends of the cast iron square tube to be inspected , and the knife edge is placed on the gauge block working surface, and then The amount of the block at each point to be inspected is tested, and the difference between the size of the equivalent block group just inserted and the size of the block at both ends is the deviation between the ends of the pair. This test shall also be carried out on several sections in the longitudinal, transverse and diagonal directions of the square face. The cast iron square tube takes its maximum value when the error directions in the straight lines of the measured positions are the same. When the error direction is inconsistent, the sum of the maximum positive difference and the absolute value of the maximum negative difference is taken as the flatness of the plane of the examined surface.  Overall size iron platform up to 4 m × 8 m, larger than this size can be a plurality of stitching, after wear. The re-repair scratch resume its accuracy, available coloring method test parts flatness, accurate, intuitive and convenient advantages . The table seat and the workpiece are pushed smoothly on the cast iron plate which has been scraped , and the workpiece is not smooth, which is convenient for measurement and ensures measurement accuracy. Want to know more about cast iron square box , square tube knowledge? Click http://ZTFXXL.html 
Pneumatic Fitting
We produce many types of pneumatic fitting and connector for our customer. the serial products have whole set of solution for many critical situations, such as: corrosive area.
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It has different material and different construction for different customer:
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