Machinery's Handbook, 31st Edition
2556
INCH KEYS AND KEYSEATS Table 5. Suggested Keyseat Fillet Radius and Key Chamfer ANSI/ASME B17.1-1967 (R2013)
Keyseat Depth, H /2
Keyseat Depth, H/ 2
Fillet Radius
45 deg. Chamfer
Fillet Radius
45 deg. Chamfer
Over
To (Incl.)
Over
To (Incl.)
1
1 ∕ 1 ∕ 1 ∕
1 ∕
1 ∕ 1 ∕ 7 ∕
1 ∕ 1 ∕
3 ∕ 5 ∕ 5 ∕
7 ∕ 1 ∕
3 ∕
7 ∕ 9 ∕
8
4
32
64
8
4
16
32
1
1
3 ∕
1 ∕ 3 ∕
4
2
16
64
4
4
4
32
1
2
3 ∕
1 ∕
1 ∕
13 ∕
2
8
8
32
4
2
8
32
All dimensions are given in inches.
Table 6. Standard Keyseat Tolerances for Electric Motor and Generator Shaft Extensions ANSI/ASME B17.1-1967 (R2013) Keyseat Width Width Tolerance Depth Tolerance Over To (Incl.) … 1 ∕ 4 +0.001 +0.000 − 0.001 − 0.015
+0.000 − 0.002 +0.000 − 0.003
+0.000 − 0.015 +0.000 − 0.015
1 ∕
3 ∕
4
4
1
3 ∕
1 ∕
4
4
All dimensions are given in inches. Table 7. Set Screws for Use Over Keys ANSI/ASME B17.1-1967 (R2013) Nom. Shaft Dia. Nom. Key Width Set Screw Dia. Nom. Shaft Dia. Nom. Key Width Set Screw Dia. Over To (Incl.) Over To (Incl.) 5 ∕ 16 7 ∕ 16 3 ∕ 32 No. 10 2 1 ∕ 4 2 3 ∕ 4 5 ∕ 8 1 ∕ 2 7 ∕ 16 9 ∕ 16 1 ∕ 8 No. 10 2 3 ∕ 4 3 1 ∕ 4 3 ∕ 4 5 ∕ 8 9 ∕ 16 7 ∕ 8 3 ∕ 16 1 ∕ 4 3 1 ∕ 4 3 3 ∕ 4 7 ∕ 8 3 ∕ 4 7 ∕ 8 1 1 ∕ 4 1 ∕ 4 5 ∕ 16 3 3 ∕ 4 4 1 ∕ 2 1 3 ∕ 4 1 1 ∕ 4 1 3 ∕ 8 5 ∕ 16 3 ∕ 8 4 1 ∕ 2 5 1 ∕ 2 1 1 ∕ 4 7 ∕ 8 1 3 ∕ 8 1 3 ∕ 4 3 ∕ 8 3 ∕ 8 5 1 ∕ 2 6 1 ∕ 2 1 1 ∕ 2 1 1 3 ∕ 4 2 1 ∕ 4 1 ∕ 2 1 ∕ 2 … … … … All dimensions are given in inches. These set screw diameter selections are offered as a guide but their use should be dependent upon design considerations. ANSI/ASME Standard Woodruff Keys and Keyseats.— American National Standard B17.2 was approved in 1967, and reaffirmed in 2013. Data from this standard are shown in Table 8, Table 9, and Table 10.
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