Depth Hole Size at Mouth

#1 Center Drill .080 .050

.100 .075
.120 .100

.140 .125

#2 Center Drill .125 .103

.150 .132

.175 .161

#3 Center Drill .150 .113

.200 .174

.250 .200

.300 .229

#4 Center Drill .175 .134

.200 .163

.225 .192

.250 .221

.275 .250

.300 .279

.325 .308

#5 Center Drill .275 .203

.300 .234

.325 .263

.350 .292

.375 .321

.400 .350

.425 .379

.450 .408

#6 Center Drill .300 .243

.325 .272

.350 .301

.375 .330

.400 .359

.425 .388

.450 .417

.475 .446

.500 .475

#7 Center Drill .350 .258

.375 .287

.400 .316

.425 .345

.450 .374

.475 .403

.500 .432

.525 .461

.550 .490

.575 .519

.600 .548

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