How far in from the corners should a hole be cut to prevent fracture cracks when hanging acrylic?

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How far in from the corners should a hole be cut to prevent fracture cracks when hanging acrylic?

When drilling holes to support sheet by point fastening, there are two rules that apply. First, the bolt hole diameter should be at least 2 times the diameter of the bolt. This allows for adequate clearance for thermal and moisture expansion and contraction. Second, the distance from the hole center to the edge of the sheet should be at least 1.5 times the diameter of the drilled hole. Please see the picture below for a detailed diagram.

In terms of using a rubber grommet, we highly recommend this to prevent cracking along the drill hole. The use of a grommet insert will give a snug fit, yet should allow for sufficient expansion and contraction of the sheet.

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