molabolt-guidance-03.doc - GUIDANCE NOTE#3 – DRILLING DIMENSIONS AND MEASUREMENTS(PEG ANCHOR 1 INTRODUCTION This guidance note provides details on

molabolt-guidance-03.doc - GUIDANCE NOTE#3 – DRILLING...

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GUIDANCE NOTE #3 – DRILLING DIMENSIONS AND MEASUREMENTS (PEG ANCHOR) 1. INTRODUCTION This guidance note provides details on drilling guidance including drilled-hole sizes calculation and centre-to-centre and edge-to-centre pitch measurement. 2. Drilling dimensions 2.1 Drilled holes may exceed the recipient bolt dimension, but only in line with the guidance below, which addresses BS5950 requirements ( Clause 6.2.2.3 Oversize Holes ).. We recommend a maximum clearance hole of + 0.1mm on sizes M8 – M14 and a maximum clearance hole of +0.2mm on sizes M16 – M24. Where distance-from-edge is a consideration for drilling, this additional tolerance may have the effect of requiring that the nominal centre of the bolt be moved further into the structure to reflect this. Over sized holes greater than the recommended tolerances set out above should be avoided. 2.2 For slotted holes, the following guidance is provided to meet BS5950 requirements ( Clause 6.2.2.2 Slotted Holes
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