Machinery's Handbook Pocket Companion

Keys and Keyseats

Table 1: Depth Control Values S and T for Shaft and Hub ANSI B17.1-1967, R1989 (See figures at end of table)

Nominal Shaft Diameter

Parallel and Taper

Parallel

Taper

Square

Rectangular

Square

Rectangular

Square

Rectangular

S

S

T

T

T

T

0.430

0.445

0.560

0.544

0.535

0.519

0.493

0.509

0.623

0.607

0.598

0.582

?

0.517

0.548

0.709

0.678

0.684

0.653

0.581

0.612

0.773

0.742

0.748

0.717

0.644

0.676

0.837

0.806

0.812

0.781

0.708

0.739

0.900

0.869

0.875

0.844

?

0.771

0.802

0.964

0.932

0.939

0.907

0.796

0.827

1.051

1.019

1.026

0.994

1

0.859

0.890

1.114

1.083

1.089

1.058

0.923

0.954

1.178

1.146

1.153

1.121

1 ?

0.986

1.017

1.241

1.210

1.216

1.185

1.049

1.080

1.304

1.273

1.279

1.248

1

1.112

1.144

1.367

1.336

1.342

1.311

1.137

1.169

1.455

1.424

1.430

1.399

1 ?

1.201

1.232

1.518

1.487

1.493

1.462

1.225

1.288

1.605

1.543

1.580

1.518

1

1.289

1.351

1.669

1.606

1.644

1.581

1.352

1.415

1.732

1.670

1.707

1.645

1 ?

1.416

1.478

1.796

1.733

1.771

1.708

1.479

1.541

1.859

1.796

1.834

1.771

1

1.542

1.605

1.922

1.860

1.897

1.835

1.527

1.590

2.032

1.970

2.007

1.945

1 ?

1.591

1.654

2.096

2.034

2.071

2.009

1.655

1.717

2.160

2.097

2.135

2.072

2

1.718

1.781

2.223

2.161

2.198

2.136

1.782

1.844

2.287

2.224

2.262

2.199

2 ?

1.845

1.908

2.350

2.288

2.325

2.263

1.909

1.971

2.414

2.351

2.389

2.326

2

1.972

2.034

2.477

2.414

2.452

2.389

1.957

2.051

2.587

2.493

2.562

2.468

2 ?

2.021

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