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screws 435
Table No. 73 is calculated by the following formulas:
d = Diameter of screw in millimeters.
D = 1.4^ + 4 millimeters approximately. Di = 1.155Z?.
Z> 2 = 1.414/}. H = d. Hi = o.jd.
The thickness of the nut is equal to the diameter of the
screw and the thickness of the head is 0.7 of the diameter of
the screw.
TABLE No. 73. Dimensions for Heads and Nuts
Screws in the International Standard System.
(All dimensions in millimeters)
for
1*
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iS ic
Q <^ <3Kffi <’J) w H fH Q <ffi <Jffiffi H fH
d D Pi p2 Hi H <Z D Pi £>2 Hi if
6 12 13.86 16.97 4.2 6 33 50 57-75 70.70 23.1 33
7 13 15.02 18.38 4-9 7 36 54 62.37 76.36 25.2 36
8 15 17-33 21.21 5-6 8 39 58 66.99 82.01 27.3 39
9 16 18.48 22.63 6-3 9 42 63 72.76 89.08 29.4 42
10 18 20.79 25-45 7.0 10 45 67 77-39 94.74 3i.5 45
11 19 21.94 26.87 7-7 11 48 7i 82.01 100.39 33-6 48
12 21 24.26 29.69 8.4 12 52 77 88.94 108.88 364 52
14 23 26.57 32.52 9.8 14 56 82 94-71 115.95 39-2 •56
16 26 30-03 36.76 11.
2
16 60 88 101.64 124.43 42.0 60
18 29 33-50 41.01 12.6 18 64 94 108.57 132.92 44-8 64
20 32 36.95 45-25 14.0 20 68 100 II5-50 141.40 47-6 68
22 35 40.43 49-49 15-4 22 72 105 121.28 148.47 50.4 72
24 38 43-89 53-73 16.8 24 76 no 127.05 155-54 53-2 76
27 42 48.51 59-39 18.9 27 80 116 133.98 164.02 56.0 80
30 46 53-13 65.04 21.0 30
If screws are used of intermediate sizes from those given
in Table No. 72 it is recommended that the heads and nuts
should be made of standard sizes and that the pitch of the
thread should be that of the nearest smaller size.
Note : This improvement in construction of screw threads
as recommended for machine screws and for International Stand-
ard Threads, could in practical work,when fitting machinery, be
taken advantage of, also when using screws having U. S. Stand-
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