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Hexagon and Spline Sockets for Metric Socket Head Cap Screws

Engineering ANSI Hardware Design Data
Engineering Metric Hardware Design Data

American National Standard Hexagon and Spline Sockets for Socket Head Cap Screws Metric Series per ANSI/ASME B18.3.1M-1986

Hexagon and Spline Sockets

Metric Hexagon Sockets
Nominal
Hexagon
Socket Size
Socket
Width
Across
Flats,
J
Socket
Width
Across
Corners,
C
Nominal Hexagon
Socket Size
Socket
Width
J
Socket
Width
Across
Corners,
C
Max
Min
Min
Max
Min
Min
1.5
2
2.5
3
4
5
6
8
10
1.545
2.045
2.560
3.071
4.084
5.084
6.095
8.115
10.127
1.520
2.020
2.520
3.020
4.020
5.020
6.020
8.025
10.025
1.73
2.30
2.87
3.44
4.58
5.72
6.86
9.15
11.50
12
14
17
19
22
24
27
32
36
12.146
14.159
17.216
19.243
22.319
24.319
27.319
32.461
36.461
12.032
14.032
17.050
19.065
22.065
24.065
27.065
32.080
36.080
13.80
16.09
19.56
21.87
25.31
27.60
31.04
36.80
41.38
Metric Spline Sockets*
Nominal Spline
Socket Size
Socket Major
Diameter,
M
Socket Minor
Diameter,
N
Width
of
Tooth,
P
Max
Min
Max
Min
Max
Min
1.829
2.438
2.819
3.378
4.648
5.486
7.391
1.8796
2.4892
2.9210
3.4798
4.7752
5.6134
7.5692
1.8542
2.4638
2.8702
3.4290
4.7244
5.5626
7.5184
1.6256
2.0828
2.4892
2.9972
4.1402
4.8260
6.4516
1.6002
2.0320
2.4384
2.9464
4.0894
4.7752
6.4008
0.4064
0.5588
0.6350
0.7620
0.9906
1.2700
1.7272
0.3810
0.5334
0.5842
0.7112
0.9398
1.2192
2.6764

*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 B18.3. Therefore, the spline keys and bits shown therein are applicable for wrenching the corresponding size metric spline sockets.

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