Dimension inches

NEMA Motor Mounting Dimensions

NEMA 17

NEMA 23

NEMA 34

NEMA 42

Motor Shaft Diameter

.1968

.250

.375

.625

Motor Shaft Length*

.945

.81

1.25

1.380

Pilot Diameter

.866

1.500

2.875

2.186

Pilot Length*

.080

.062

.062

.062

Mounting Bolt Circle

1.725

2.625

3.875

4.950

Bolt Hole Size

4-40 UNC

.195

.218

.281

Bolt Hole Distance (square)

1.220

1.856

2.740

3.500