Fig. 409.
When the hole through which the bolt passes is considerably larger in diameter than the bolt, the flange nut shown in [Fig. 409] is employed, the flange covering the hole. A detached washer may be used for the same purpose, providing that its hole fit the bolt and it be of a sufficient thickness to withstand the pressure and not bend or sink into the hole.
Fig. 410.
Fig. 411.
