Specialty FabricationHoles
Specialty Fabrication Holes.
We use Z. Bavelloini vertical two-sided hole drilling equipment for precision. Hole drilling capabilities start at 1/4 inch.
Hole Dimension Guidelines
The maximum number of holes allowed in any lite of glass is ten (10).
Minimum Size
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.
Maximum Size
The maximum size of a hole can not be more than 1/3 of 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″.
| Inches | |
|---|---|
| Glass Thickness | 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 |
| Millimeters | |
|---|---|
| Glass Thickness | D = Minimum Diameter |
| 3 | 5 |
| 4 | 6 |
| 5 | 6 |
| 6 | 8 |
| 8 | 10 |
| 10 | 11 |
| 12 | 14 |
| 16 | 17 |
| 19 | 21 |
Minimum Glass Width with Holes Guidelines
The minimum width of glass containing holes that can be satisfactorily tempered is eight (8”) inches. Additionally, all other requirements of hole location, spacing of holes, and dimensions of holes must 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 |
Hole Spacing Guidelines
The minimum width of glass containing holes that can be satisfactorily tempered is eight (8”) inches. Additionally, all other requirements of hole location, spacing of holes, and dimensions of holes must be met.
Glass Edge to Nearest Hole
The distance from any edge of glass to the nearest point on the rim of the hole (x) must be at least 6mm (1/4″) or 2 times the thickness of the glass, whichever is greater.
Between Holes
The distance between holes must be 10mm (3/8″) or two (2) times the thickness of the glass, whichever is greater.
| Inches | |
|---|---|
| Glass Thickness | X = Minimum Distance |
| 1/8 | 1/4 |
| 5/32 | 5/16 |
| 3/16 | 3/8 |
| 1/4 | 1/2 |
| 5/16 | 5/8 |
| 3/8 | 3/4 |
| 1/2 | 1 |
| 5/8 | 1-1/4 |
| 3/4 | 1-1/2 |
| Millimeters | |
|---|---|
| Glass Thickness | X = Minimum Distance |
| 3 | 6 |
| 4 | 8 |
| 5 | 10 |
| 6 | 12 |
| 8 | 16 |
| 10 | 19 |
| 12 | 25 |
| 16 | 32 |
| 19 | 38 |
Hole Placement Near Glass Corners Guideline
Holes near corners must be located so that the nearest edge of the hole is at least 6.5 times the thickness of the glass from the tip of the corner when the corner is 90° or more.
| Inches | |
|---|---|
| Glass Thickness | X = Minimum Distance |
| 1/8 | 13/16 |
| 5/32 | 1-1/64 |
| 3/16 | 1-7/32 |
| 1/4 | 1-5/8 |
| 5/16 | 2-1/32 |
| 3/8 | 2-7/16 |
| 1/2 | 3-1/4 |
| 5/8 | 4-1/16 |
| 3/4 | 4-7/8 |
| Millimeters | |
|---|---|
| Glass Thickness | X = Minimum Distance |
| 3 | 21 |
| 4 | 26 |
| 5 | 31 |
| 6 | 41 |
| 8 | 52 |
| 10 | 62 |
| 12 | 82 |
| 16 | 103 |
| 19 | 124 |
Viracon cannot guarantee the future availability of component parts manufactured or supplied by others that are incorporated into Viracon products.