Machinery's Handbook, 31st Edition
Metric Keys and Keyways 2549 ANSI/ASME B18.25.2M (Withdrawn) also differs from ISO 3912 in that it: a) does not restrict the corners of a key to be chamfered but allows either a chamfer or a radius on the key; b) specifies a key material hardness rather than a tensile property; and c) specifies h12 rather than h11 for the tolerance of the height of the keys. Tolerances.— Many of the tolerances shown in Table 5 and Table 6 are from ANSI/ASME B4.2, Preferred Metric Limits and Fits (ISO 286-1 and ISO 286-2). As a result in addition to plus-minus tolerances which are common in the United States some are expressed as plus-plus deviations from the basic size. Table 5. Dimensions for Metric Woodruff Keys ANSI/ASME B18.25.2M-1996 (Withdrawn)
b
x
x
b
x
x
h
h
1
1
h
s
2
b
b
s
x = Sharp edges removed not to exceed S max
Whitney Form (flat bottom type)
Normal Form (full radius type)
Chamfer or Radius, s
Diameter, D
Width
Height
Tolerance h12
Tolerance h12
Tolerance
Key Size b × h × D b Tolerance h 1
a
h12 Min. Max.
h 2
D
1.4 2.6 2.6 3.7 3.7 5.0 6.5 6.5 7.5 6.5 7.5 9.0
4 0 − 0.120
1
1.1 2.1 2.1 3.0 3.0 4.0 5.2 5.2 6.0 5.2 6.0 7.2 7.2 8.0 8.8
l × l.4 × 4
0 − 0.10
7 7
1.5 × 2.6 × 7 1.5
0 − 0.10
2
2 × 2.6 × 7
0 − 0.150
10 10 13 16 16
0.16 0.25
2 × 3.7 × 10 2 2.5 × 3.7 × 10 2.5 3 × 6.5 × 16 3 4 × 6.5 × 16 4 4 × 7.5 × 19 4 3 × 5 × 13 3 5 × 6.5 × 16 5 5 × 7.5 × 19 5
0 − 0.12
0 − 0.180
0 − 0.025
0 − 0.12
19 0 − 0.210 16 0 − 0.180
0 − 0.15
19 22 22 25 28
0.25 0.40
5 6 6 8
5 × 9 × 22 6 × 9 × 22 6 × 10 × 25 8 × 11 × 28
0 − 0.210
9.0 10.0
0 − 0.15
11.0 0
0.40 0.60
0 − 0.250
− 0.18
13.0
10.4 0 − 0.18 32
10 × 13 × 32 10
a Height h 2 is based on 0.80 times height h 1 . Designation.— Keys conforming to this standard shall be designated by the following data, preferably in the sequence as follows: a) ASME document number; b) product name; c) nominal size, width ( b ) × height ( h ) × length; d) form; and e) hardness (if other than non-hardened). Example: ANSI/ASME B18.25.2M (Withdrawn), Woodruff Key 6 × 10 × 25 normal hardened; ANSI/ASME B18.25.2M (Withdrawn), Woodruff Key 3 × 5 × 13 Whitney.
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