Key number for a woodruff key is 2428. The nominal diameter of the key is: (a) 28 in (b) 24 in (c) 3.5 in (d) 3/4 in ANSI Standard B 17.2-1967 lists the dimensions for a large number of standard Woodruff keys and their stress analysis forthis type of key proceeds in the manner discussed for the parallel key, taking into consideration the particular geometry ofthe Woodruff key. Table 11 -3 provides a sampling. Note that the key number indicates the nominal key dimensions. Thelast two digits give the nominal diameter, B in eighths of an inch, and the digits preceding the last two give the nominalwidth, W, in thirty-seconds of an inch. For example, key number 1210 has a diameter of 10/8 in (1 % in),and a widthof 12/32 in (3/8 in). The actual size of the key is slightly smaller than half of the full circle, as shown indimensions C and F in Table 11-3.TABLE 11-3 Woodruff Key DimensionsKey numberNominal key size, W x BActual length, FHeight of key, CShaft keyseat depthHub keyseat depth2021/16 x 1/40.2480.1040.07280.03722041/16 x 1/20.4910.2000.16680.03724061/8 x 3/40.7400.3100.24550.06856083/16 x 10.9920.4350.33930.09978101/4 x 11.2400.5440.41700.131012103/8 x 11.2400.5440.35450.193516281/2 x 3)2.8800.9350.68300.25603/4 x 3324282.8800.9350.55800.3810Source: Reprinted from ASME B17.2-1967, by permission of the American Society of Mechanical Engineers. All rights reserved.Note: All dimensions are given in inches.

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Key number for a woodruff key is 2428. The nominal diameter of the key is: (a) 28 in (b) 24 in (c) 3.5 in (d) 3/4 in

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Concept explainers

Design of Shafts and Shaft Components

The shaft is basically defined as the machine element that rotates, is in circular cross-section, it is majorly used to transfer the power from one part of the system to another, or from a power generating machine to a power absorbing machine. The shaft is supported on bearings and is rotated with the help of a set of gears or pulleys that are used for the power transmission. Bending moment, torsion, and an axial force act upon the shaft. Designing of shaft primarily involves determining stresses at a critical point in the shaft that is arising due to loading.

Question

Key number for a woodruff key is 2428. The nominal diameter of the key is:

(a) 28 in

(b) 24 in

(d) 3/4 in

ANSI Standard B 17.2-1967 lists the dimensions for a large number of standard Woodruff keys and their stress analysis for
this type of key proceeds in the manner discussed for the parallel key, taking into consideration the particular geometry of
the Woodruff key. Table 11 -3 provides a sampling. Note that the key number indicates the nominal key dimensions. The
last two digits give the nominal diameter, B in eighths of an inch, and the digits preceding the last two give the nominal
width, W, in thirty-seconds of an inch. For example, key number 1210 has a diameter of 10/8 in (1 % in),and a width
of 12/32 in (3/8 in). The actual size of the key is slightly smaller than half of the full circle, as shown in
dimensions C and F in Table 11-3.
TABLE 11-3 Woodruff Key Dimensions
Key number
Nominal key size, W x B
Actual length, F
Height of key, C
Shaft keyseat depth
Hub keyseat depth
202
1/16 x 1/4
0.248
0.104
0.0728
0.0372
204
1/16 x 1/2
0.491
0.200
0.1668
0.0372
406
1/8 x 3/4
0.740
0.310
0.2455
0.0685
608
3/16 x 1
0.992
0.435
0.3393
0.0997
810
1/4 x 1
1.240
0.544
0.4170
0.1310
1210
3/8 x 1
1.240
0.544
0.3545
0.1935
1628
1/2 x 3)
2.880
0.935
0.6830
0.2560
3/4 x 33
2428
2.880
0.935
0.5580
0.3810
Source: Reprinted from ASME B17.2-1967, by permission of the American Society of Mechanical Engineers. All rights reserved.
Note: All dimensions are given in inches.

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