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SOCKET CAP, SHOULDER, AND SET SCREWS,
HEX AND SPLINE KEYS (INCH SERIES)

ASME B18.3-2003


TABLE 7 DIMENSIONS OF SPLINE SOCKETS

Nominal
Socket and
Key Size

Number
of Teeth

M

N

P

Socket Major
Diameter

Socket Minor
Diameter

Width of Tool

Max.

Min.

Max.

Min.

Max.

Min.
0.033
0.048 [Note (3)]
0.048
0.060		 4
4
6
6		 0.035
0.050
0.050
0.062		 0.034
0.049
0.049
0.061		 0.0275
0.0395
0.041
0.051		 0.0260
0.038
0.040
0.050		 0.0120
0.017
0.011
0.014		 0.0115
0.016
0.010
0.013
0.069 [Note (3)]
0.072
0.076 [Note (3)]
0.096		 4
6
4
6		 0.071
0.074
0.079
0.098		 0.070
0.073
0.078
0.097

0.0545
0.064
0.0575
0.082

 0.053
0.063
0.056
0.080		 0.021
0.016
0.023
0.022		 0.020
0.015
0.022
0.021
0.111
0.133
0.145
0.168		 6
6
6
6		 0.115
0.137
0.149
0.173		 0.113
0.135
0.147
0.171		 0.098
0.118
0.128
0.150		 0.096
0.116
0.126
0.147		 0.025
0.030
0.032
0.036		 0.023
0.028
0.030
0.033
0.183
0.216
0.251
0.291		 6
6
6
6		 0.188
0.221
0.256
0.298		 0.186
0.219
0.254
0.296		 0.163
0.190
0.221
0.254		 0.161
0.188
0.219
0.252		 0.039
0.050
0.060
0.068		 0.037
0.048
0.058
0.066
0.372
0.454
0.595
0.620		 6
6
6
6		 0.380
0.463
0.604
0.631		 0.377
0.460
0.601
0.627		 0.319
0.386
0.509
0.535		 0.316
0.383
0.506
0.531		 0.092
0.112
0.138
0.149		 0.089
0.109
0.134
0.145
0.698
0.790		 6
6		 0.709
0.801		 0.705
0.797		 0.604
0.685		 0.600
0.681		 0.168
0.189		 0.164
0.185

GENERAL NOTES:  
(a) For additional requirements, refer to section 2, General Data, of this Standard.
(b) Broach petals at the bottom of the socket are permissible.

NOTES:
(1) Applicable socket depths are specified in the dimensional tables and notes for the respective screw types.
(2) Where spline sockets are chamfered, the depth of chamfer shall not exceed 10% of the nominal socket size for sizes up to and including 0.060 in., and 7.5% for larger sizes. For chamfered sockets, it is permissible for the NOT GO socket gage to enter to the depth of chamfered as specified in Mandatory Appendix 1.
(3) Where both six and four splines are available, six splines will be supplied unless four splines are ordered.

 

          Reprinted from ASME B18.3-2003, by permission of The American Society of Mechanical Engineers.  All rights reserved.

 

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