SOCKET CAP, SHOULDER, AND SET SCREWS HEX AND SPLINE KEYS (INCH SERIES)
ASME B18.3-2003
TABLE 6 DIMENSIONS OF HEXAGON SOCKETS
Nominal Socket Size		J		Nominal Socket Size		J		Nominal Socket Size		J
		Socket Width Across Flats				Socket Width Across Flats				Socket Width Across Flats
		Max.	Min.			Max.	Min.			Max.	Min.
... ... ... 1/16	0.028 0.035 0.050 0.062	0.0285 0.0355 0.0510 0.0635	0.0280 0.0350 0.0500 0.0625	3/16 7/32 1/4 5/16	0.188 0.219 0.250 0.312	0.1900 0.2217 0.2530 0.3160	0.1875 0.2187 0.2500 0.3125	7/8 1 1-1/4 1-1/2	0.875 1.000 1.250 1.50	08850 1.0200 1.2750 1.5300	0.8750 1.0000 1.2500 1.5000
5/64 3/32 7/64 1/8	0.078 0.094 0.109 0.125	0.0791 0.0952 0.1111 0.1270	0.0781 0.0937 0.1094 0.1250	3/8 7/16 1/2 9/16	0.375 0.438 0.500 0.562	0.3790 0.4420 0.5050 0.5680	0.3750 0.4375 0.5000 0.5625	1-3/4 2 2-1/4 2-3/4	1.750 2.000 2.250 2.750	1.7850 2.0400 2.2950 2.8050	1.7500 2.0000 2.2500 2.7500
9/64 5/32	0.141 0.156	0.1426 0.1587	0.1406 0.1562	5/8 3/4	0.625 0.750	0.6310 0.7570	0.6250 0.7500	3 ...	3.000 ...	3.0600 ...	3.0000 ...

(For additional requirements refer to notes below and General Data on page 2.)

GENERAL NOTES:
(a) Sockets up to and including 1 in. nominal size shall be checked in accordance with the hexagon socket gages and gaging specified in Mandatory Appendix 1. Suitability of larger sockets shall be determined by means of direct measurement for various technical and economic reasons.
(b) Dimensions of sockets apply before plating. When plated, see para. 2.1, Sockets, for gaging. (For plated products, see para. 1.7, Introductory Notes.)
(c) Broach petals at the bottom of the socket are permissible.
(d) For additional requirements, refer to section 2, General Data, of this Standard.

NOTES:
(1) Applicable socket depths are specified in the dimensional tables and notes for the respective screw types.
(2) For broached sockets, the maximum acceptable overcut shall be a size causing an average 20% flat length reduction in the maximum dimension across flat hexagon for socket sizes up to and including I in., and 30% for larger sockets. The maximum overcut on any one of the six flats shall not exceed a 40% reduction in flat length for any size socket.
(3) where hexagon sockets are chamfered, the depth of chamfer shall not exceed 10% of the nominal socket size for sizes up to and including 1/16 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 chamfer as specified in Mandatory Appendix 1.