From Shop Reference for Students and Apprentices, Second Edition

Overview

ANSI Standard Keys and Keyseats. American National Standard, B17.1 Keys and Keyseats, based on current industry practice, was approved in 1967, and reaffirmed in 1989. This standard establishes a uniform relationship between shaft sizes and key sizes for parallel and taper keys as shown in Table 1. Other data in this standard are given in Tables 2 and 3 through 7. The sizes and tolerances shown are for single key applications only.

Table 1: Key Size Versus Shaft Diameter ANSI B17.1-1967 (R1998)

Nominal Shaft Diameter

Nominal Key Size

Normal Keyseat Depth

Height, H

H/2

Over

To (Incl.)

Width, W

Square

Rectangular

Square

Rectangular

5/16

7/16

3/32

3/32

3/64

7/16

9/16

1/8

1/8

3/32

1/16

3/64

9/16

7/8

3/16

3/16

1/8

3/32

1/16

7/8

1 1/4

1/4

1/4

3/16

1/8

3/32

1 1/4

1 3/8

5/16

5/16

1/4

5/32

1/8

1 3/8

1 3/4

3/8

3/8

1/4

3/16

1/8

1 3/4

2 1/4

1/2

1/2

3/8

1/4

3/16

2 1/4

2 3/4

5/8

5/8

7/16

5/16

7/32

2 3/4

3 1/4

3/4

3/4

1/2

3/8

1/4

3 1/4

3 3/4

7/8

7/8

5/8

7/16

5/16

3 3/4

4 1/2

1

1

3/4

1/2

3/8

4 1/2

5 1/2

1 1/4

1 1/4

7/8

5/8

7/16

5 1/2

6 1/2

1 1/2

1 1/2

1

3/4

1/2

Square Keys preferred for shaft diameters above this line; rectangular keys, below

6 1/2

7 1/2

1 3/4

1 3/4

1 1/2 [a]

7/8

3/4

7...


Products & Services
Fixture Keys
Fixture keys are used to accurately locate fixtures or machine components. Typically, they are assembled into a hole or a machined slot.
V-ribbed Pulleys
V-ribbed pulleys or sheaves have a series of V-shaped ribs that mate with V-ribbed belts. They are used in numerous power transmission applications.
Self-sealing Fasteners
Self-sealing fasteners have an elastomeric insert or captive O-ring that simultaneously provides sealing and locking.
Hydraulic Hose
Hydraulic hose is specifically designed to convey hydraulic fluid to or among hydraulic components, valves, actuators, and tools.
Pneumatic Fittings
Pneumatic fittings are parts used to connect sections of pipe, tube, and hose in pneumatic (pressurized gas) lines and systems.

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