2 0 1 3 P R O D U C T G U I D E VIRACON PRODUCT GUIDE 2013 ...

holes
HOLES
Viracon offers hole drilling capabilities starting at 1/4 inch. Our Z. Bavelloini vertical two-sided hole drilling equipment offers
precision accuracy.
MAXIMUM NUMBER OF HOLES
The maximum number of holes allowed in any lite of glass is ten (10.)
GUIDELINE FOR HOLE DIMENSION
Circular holes must have a diameter at least 1/16” greater than the thickness of the glass, with 1/4” (6mm) being the smallest
hole allowed. The maximum size of a hole can not be more than 1/3 the narrowest dimension of the glass.
For holes that have a straight edge, or are non-circular, fillets are required in the corners. A fillet is a rounded corner from which the
straight edge emerges. The radius of the fillet must be equal to or greater than the thickness of the glass, but not less than 1/2”.
Glass Thickness
Inches
D=Minimum
Diameter
1/8 3/16
5/32 7/32
3/16 1/4
1/4 5/16
5/16 3/8
3/8 7/16
1/2 9/16
5/8 11/16
3/4 13/16
Glass Thickness
Millimeters
D=Minimum
Diameter
3 5
4 6
5 6
6 8
8 10
10 11
12 14
16 17
19 21
Guideline for Minimum Glass Width with Holes
The minimum width of glass containing holes that can be satisfactorily tempered is an 8” width. All other requirements of hole location,
spacing of holes, and dimensions of holes must also be met.
Inches
Glass Thickness Minimum Width
1/8 8
5/32 8
3/16 8
1/4 8
5/16 8
3/8 8
1/2 8
5/8 8
3/4 8
Millimeters
Glass Thickness Minimum Width
3 203
4 203
5 203
6 203
8 203
10 203
12 203
16 203
19 203
032 VIRACON // COMPONENTS & ENHANCEMENTS