Weight Hole Removal Chart

 

This is an Estimated Weight Hole removal chart in Ounces.

 

The USBC states that a bowling ball may have no more than one(1) ounce of side weight after the holes are drilled. While many people have their opinions about whether or not this rule is valid, it is still in effect. You need a DoDo scale to weigh the ball for side weight. If you are over one(1) ounce (we recommend 3/4 ounce) then use the guide below to help determine what size drill bit you should use, and how deep you should drill.

 

Drill
Bit
Size
Hole Depth in Inches (Estimated)
0.500 0.750 1.000 1.250 1.500 1.750 2.000 2.250 2.500 2.750 3.000
19/32 0.119 0.178 0.238 0.297 0.356 0.416 0.475 0.534 0.594 0.653 0.713
5/8 0.122 0.184 0.245 0.306 0.367 0.428 0.480 0.551 0.612 0.673 0.734
21/32 0.135 0.202 0.269 0.336 0.403 0.470 0.538 0.605 0.672 0.739 0.806
11/16 0.148 0.222 0.296 0.369 0.443 0.517 0.591 0.665 0.739 0.813 0.887
23/32 0.157 0.235 0.313 0.391 0.469 0.548 0.626 0.704 0.782 0.860 0.939
3/4 0.176 0.263 0.351 0.439 0.527 0.615 0.702 0.790 0.878 0.966 1.054
25/32 0.191 0.286 0.382 0.477 0.573 0.668 0.764 0.859 0.955 1.050 1.146
13/16 0.206 0.309 0.412 0.515 0.618 0.720 0.823 0.925 1.029 1.132 1.235
27/32 0.238 0.356 0.475 0.594 0.713 0.831 0.950 1.068 1.188 1.306 1.425
7/8 0.250 0.375 0.500 0.625 0.750 0.875

1.000

1.125 1.250 1.375 1.500
29/32 0.263 0.394 0.526 0.657 0.788 0.919 1.050 1.182 1.313 1.444 1.576
15/16 0.273 0.409 0.546 0.682 0.819 0.955 1.092 1.228 1.365 1.501 1.638
31/32 0.300 0.450 0.600 0.750 0.900 1.050 1.200 1.350 1.500 1.650 1.800
1 0.325 0.488 0.650 0.813 0.975 1.138 1.300 1.463 1.625 1.788 1.950
1 1/32 0.350 0.525 0.700 0.875 1.050 1.225 1.400 1.575 1.750 1.925 2.100
1 1/16 0.368 0.553 0.737 0.921 1.105 1.289 1.474 1.658 1.842 2.026 2.210
1 3/32 0.388 0.581 0.775 0.969 1.163 1.357 1.550 1.744 1.938 2.132 2.326
1 1/8 0.400 0.600 0.800 1.000 1.200 1.400 1.600 1.800 2.000 2.200 2.4000
1 5/32 0.425 0.638 0.851 1.063 1.275 1.488 1.700 1.913 2.125 2.338 2.550
1 3/16 0.450 0.675 0.900 1.125 1.350 1.575 1.800 2.025 2.250 2.475 2.700

 



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