Machinery's Handbook, 31st Edition
1732
Metric Nuts Table 23. American National Standard Hexagon and Spline Sockets for Socket Head Cap Screws—Metric Series ANSI/ASME B18.3.1M-1986 (Withdrawn) J T C M P T
N
METRIC HEXAGON SOCKETS See Table 21
METRIC SPLINE SOCKET See Table 21
Nominal Hexagon Socket Size
Nominal Hexagon Socket Size
Socket Width Across Flats, J
Socket Width Across Corners, C
Socket Width Across Flats, J
Socket Width Across Corners, C
Metric Hexagon Sockets
Max.
Min.
Min. 1.73 2.30 2.87 3.44 4.58 5.72 6.86 9.15 11.50
Max.
Min.
Min. 13.80 16.09 19.56 21.87 25.31 27.60 31.04 36.80 41.38
1.5
1.545 1.520 2.045 2.020 2.560 2.520 3.071 3.020 4.084 4.020 5.084 5.020 6.095 6.020 8.115 8.025 10.127 10.025
12 14 17 19 22 24 27 32 36
12.146 12.032 14.159 14.032 17.216 17.050 19.243 19.065 22.319 22.065 24.319 24.065 27.319 27.065 32.461 32.080 36.461 36.080
2
2.5
3 4 5 6 8
10
Metric Spline Sockets a
Socket Major Diameter, M
Socket Minor Diameter, N
Width of Tooth, P
Nominal Spline Socket Size
Max. 1.8796 2.4892 2.9210 3.4798 4.7752 5.6134 7.5692
Min.
Max. 1.6256 2.0828 2.4892 2.9972 4.1402 4.8260 6.4516
Min.
Max. 0.4064 0.5588 0.6350 0.7620 0.9906 1.2700 1.7272
Min.
1.829 2.438 2.819 3.378 4.648 5.486 7.391
1.8542 2.4638 2.8702 3.4290 4.7244 5.5626 7.5184
1.6002 2.0320 2.4384 2.9464 4.0894 4.7752 6.4008
0.3810 0.5334 0.5842 0.7112 0.9398 1.2192
2.6764 a The tabulated dimensions represent direct metric conversions of the equivalent inch size spline sockets shown in American National Standard Socket Cap, Shoulder and Set Screws.—Inch Series ANSI/ASME B18.3. Therefore, the spline keys and bits shown therein are applicable for wrenching the corresponding size metric spline sockets. At its meeting in Varna, May 1977, ISO/TC2 studied several technical reports analyzing design considerations influencing determination of the best series of widths across flats for hex bolts, screws, and nuts. A primary technical objective was to achieve a logical ratio between under head (nut) bearing surface area (which determines the magnitude of compressive stress on the bolted members) and the tensile stress area of the screw thread (which governs the clamping force that can be developed by tightening the fastener). The series of widths across flats in the ANSI Standards agree with those which were selected by ISO/TC2 to be ISO Standards. One exception for width across flats of metric hex nuts, styles 1 and 2, metric slotted hex nuts, metric hex jam nuts, and prevailing-torque metric hex nuts is the M10 size. These nuts in M10 size are currently being produced in the United States with a width across flats of 15 mm. This width, however, is not an ISO Standard. Unless these M10 nuts with width across flats of 15 mm are specifically ordered, the M10 size with 16 mm width across flats will be furnished.
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