Aluminum Sun Room,Garden House,Green House Woodwin Door & Window Industries Co., Ltd , http://www.chalwindow.com Our company is a joint venture between China National Geological Equipment Corporation and Jinan Diesel Engine Co., Ltd., mainly producing gears and other products for Jinan Diesel Engine Co., Ltd. Among them, Z12V.06.06B water pump intermediate gear has a convex step outside the concave surface. The tolerance requirement is φ60_(-0.06)~(0.03)mm, which is difficult to measure with the common normal line.