Door Hinge Bolts. Fitting Instructions. Drill holes in frame and door to sizes shown on template. Door may require removal for drilling. Screw recieving plates onto May 14, 2010 - Apr 6, 2019 - THIS FITTING INSTRUCTION IS APPLICABLE TO THE DOG BOLT HINGE TYPE AR8186. MUST be fitted under both leaves of the hinge on fire rated doors. CL. Jan 14, 2011 - About 50mm below the top door hinge, drill a hole 8mm in diameter and 41mm deep centrally in the edge of the door. (DIY TIP: Mark your drill bit with sticky. the under side of the plate, check that the bolt still enters easily and then screw the plate flush in the recess. 6 Repeat instructions to fit the second hinge bolt. Nov 12, 2014 -