Bolts for pillow-blocks are turned so that their intermediate parts are no larger in diameter than the smallest diameter of the screws. A bolt of this sort is shown by Fig. 1101, and is lighter, more flexible, and less liable to break than one having a cylindrical mid-part of the same diameter as the screw, such as that in Figs. 1103 or 1090. There are also several other classes of bolts which should be thus treated, such as framing-bolts and those for entablatures, indicated by Fig. 1103.

Bolts for pillow-blocks and framing-bolts also require screwed holes to be formed in their ends, for the convenience of lifting them. A bolt-end of this sort is indicated in Fig. 1104, having a loop-bolt in the end, ready for lifting. The outer diameter of the loop must be less than the diameter of the bolt-hole in the framing, or pillow-block, because when the lifting-bolt is in its place it must pass through the framing previous to the bolt being lifted.

The small hole for the loop-bolt may be made either before the large bolt is turned, or afterwards, when the screwing is finished and the superfluous piece cut off, if any exists. If the small hole is made previous to turning, it serves instead of a conical recess ; and in such a case, the rugged extremity of the bolt must be properly reduced, and whatever extra length exists must be cut off previous to drilling the hole. The exact place in which the hole is to be drilled, is shown by the lining, previous to centring, and while entering the drill it needs keeping in the intended centre of the bolt; because if the hole is made in the wrong place it will be necessary to put a short bolt into the hole and to centre this bolt.