hitachi — Hitachi Industrial Manual - Technical and Workshop Guide (EN)

GENERAL / Tightening IMPORTANT: The following items are applied to both fine and coarse pitch threads. Apply lubricant to the bolts and nuts in order to reduce friction coefficient of them. (For example, spindle oil with white zinc B dissolved in it) Torque tolerance is ±10 %. Use the bolts of correct length. The bolts that are too long cannot be tightened as the bolt tip comes into contact with the bottom of bolt hole. Also the bolts that are too short cannot develop sufficient tightening force. The torque given in the chart on the previous page are for general use only, however, a different torque is given for a specific application. Use the specified torque.

Clean the nut and bolt threads and remove dirt or corrosion before installing. Tightening Order When tightening two or more bolts, tighten them alternately, as shown, to ensure even tightening. c a b 1.4 6 1 1 3 12 14 9 4 6 7 4 5 13 2 8 5 2 3 10 11 a - Equally tighten upper and lower alternately b - Tighten diagonally c - Tighten from center and diagonally 2.3 W105-01-01-003 W1-2-2