Page 198 - Demo

196 ISCAR SPOT DRILLING AND CHAMFERINGBasic Dimensions of Drilling Heads MM HCD140%u00b0DCDCONMSLFAPMX KAPRLUDCXTHSZMSDC %u2013 cutting diameterDCX %u2013 cutting diameter maximumLF %u2013 functional lengthLU %u2013 usable lengthAPMX %u2013 depth of cut maximumDCONMS %u2013 connection diameter machine sideTHSZMS %u2013 connection thread designationKAPR %u2013 point angleUsable Information%u2022 MM HCD drilling heads with a point angle of 80%u00b0 were designed mainly for the countersink according to standard ANSI B18.3 that define hexagon and spline socket flat countersunk head cap screws.82%u00b0%u00b12%u00baenlarged view of head82%u00b0%u00b12%u00baenlarged view of head%u2022 The MM HCD heads with a point angle of 100%u00b0 were designed mainly for countersink holes for head cap screws according to ISO 5856, DIN EN 4072, IS 15437; and for rivets according to MIL-STD-40007. These heads can also be applied for machining countersink holes for general-use 100%u00b0 flat countersunk head machine screws, in accordance with ANSI B18.6.3-1972. Most aircraft countersunk screws require a 100%u00b0 angle countersink.100%u00b0%u00b10.5%u00ba