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HEXAGONAL BOLTS AND NUT PROPORTIONS FOR HEXAGONAL BOLTS From Design Data Book Assuming Diameter (d) = 24 mm Size across flat (S) = 1.25d+6 mm Size across corner (e) = 1.155×S Height of the nut (h) = 0.8 d to d Angle =30° The length of threaded part Height (h) = 0.75 d to 0.8 d length (l) = 2d+5 mm, for bolt up to and including. length (l) = 2d+10mm, for bolts length above 80 mm and up to 200 mm. length (l) = 2d+20 mm, for lengths above 200 mm. V - THREAD WITH FLAT CREST AND ROOT Hexagonal bolt thread part (v- thread with flat crest and root) Pitch (P) = 3 mm Height (H) = 3 mm PROPORTIONS FOR HEXAGONAL NUT Assuming Diameter (d) = 24 mm Size across flat (S) = 1.25d+6 mm Size across corner (e) = 1.155×S Height of the nut (h) = 0.8 d to d Angle =30° PROPORTIONS FOR SQUARE NUT Size across the flat (s) = 1.5 d +3 mm Size across the corner e = √2 ×s Height of the nut h = 0.8 d to d
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