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SCREWS 427
A. S. M. E. Standard of Machine Screws.*
The Standard of Machine Screws approved by unanimous
vote of "The American Society of Mechanical Engineers" at
Indianapolis, May 30, 1907, has 21 numbered Sizes from Num-
ber o to Number 30 inclusive, with an increment of 0.013 i ncn
for each number. Number o being 0.060 inch and Number 30
0.450 inch outside diameter. From Number o to Number 10 all
numbers and above Number 10 only the even numbers are used.
The old screw gage had an increment of 0.013 16 inch; Num-
ber o being 0.05784 inch and Number 30 being 0.45264 inch
outside diameter. This new standard, therefore, eliminates many
awkward and unnecessary decimal figures.
TABLE 66—A. S. M. E. Standard Machine Screws.**
u
£>
S
3
Z
-1
OJ
>-*
HPLh
Maximum Screw
Diameters
Minimum Screw
Diameters
WQ
u
11
u
OJ
o-~
P4Q
*c3
^
SI
OJ
OJ
u
8.2
2
3
4
5
6
7
8
9
10
12
14
16
18
20
22
24
26
28
30
80
72
64
56
48
44
40
36
36
32
3°
28
24
22
20
20
18
16
16
14
14
.060
.073
.086
.099
.112
.125
.138
.151
.164
.177
.190
.216
.242
.268
.294
.320
.346
.372
.398
.424
•450
.0519
.0640
.0759
.0874
.0985
.1102
.1218
.1330
.1460
.1567
. 1684
.1928
.2149
.2385
.2615
.2875
.3099
.3314
• 3574
• 3776
.4036
.0438
.0550
.0657
.0758
.0849
• 0955
.1055
.1149
.1279
.1364
.1467
.1696
.1879
.2090
.2290
.2550
.2738
.2908
.3168
.3312
•3572
.0572
.0700
.0828
• 0955
.1082
.1210
.1338
.1466
.1596
.1723
.1852
.2111
.2368
.2626
.2884
.3H4
.3402
.3660
.3920
.4178
•4438
.0505
0625
0743
0857
0966
1082
1197
1308
1438
1544
1660
1904
2123
2358
2587
2847
3070
3284
3544
3745
4005
.0410
.0520
.0624
.0721
.0807
.0910
.1007
.1097
.1227
.1307
.1407
.1633
.1808
.2014
.2208
.2468
.2649
.2810
.3070
.3204
•3464
* For very complete information regarding machine screws and
useful suggestions for system of standard gages for manufacturing
standard sizes, see Volume 29 of the transactions of The American Society
of Mechanical Engineers.
**The Author wishes to express his thanks to the Corbin Screw Corpor-
ation, New Britain, Conn., for their very valuable suggestions, data,
furnished him for this and the following abridged tables of the dimen-
sions for A. S. M. K. standard machine screws.
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