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【Daily Question】Pump Equipment Technical Exchange Edition 20180216

2018-02-17View Original

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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: The bearing of a single-stage cantilever pump is an angular contact ball bearing 7312B. In the code 7312B, the letter B indicates that the nominal contact angle of this bearing is ( ). A 15° B 25° C 30° D 40° Correct answer: D A: Standard contact angle of 30°. A5, specially produced by NSK: Standard contact angle of 25°; some brands refer to the A5 angle as the AC angle. B: Standard contact angle of 40°. C: Standard contact angle of 15°. https://attach01.hcbbs.com/forum/201802/14/235031bnt8jf4tttq07afj.jpg.thumb.jpg

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