【Daily Question】Pump Equipment Technical Exchange Edition 20180212

Thread Content

Participation: Prize 3 Wealth； Correct answer: Reward of 10 wealth points ； Note: A reward of 10 wealth points will be given for correct answers within 48 hours; this post is valid for 48 hours. Multiple-choice question: For the deep groove ball bearing 6308, its bearing bore diameter is ( ) mm. A 8 B 32 C 40 D 80 Correct answer: C. The inner diameter of a bearing is indicated by the first two digits on the right side of the basic code. For bearings with a common inner diameter of d=20～480 mm, the inner diameter is usually a multiple of 5; these two digits represent the quotient obtained by dividing the bearing’s inner diameter by 5. For example, 08 indicates d=40 mm ； 12 indicates d=60mm, and so on. For bearings with inner diameters of 10 mm, 12 mm, 15 mm, and 17 mm, the inner diameter codes are 00, 01, 02, and 03 respectively. https://attach01.hcbbs.com/forum/201801/05/235057wnwxbzxb311ikvvz.jpg.thumb.jpg