UNITED STATES STANDARD SIZES OF WROUGHT IRON WELDED PIPE.

Inside
diam-
eter
nom.		 Actual
outside
Diam-
eter.		 Thick-
ness.		 Actual
Inside
Diam-
eter.		 External
circum-
ference.		 Internal
circum-
ference.		 Length
of pipe
per
square
foot of
outside
surface.		 Length
of pipe
per
square
foot of
inside
surface.		 External
area.		 Actual
internal
area.		 Length
of pipe
con-
taining
one
cubic
foot.		 Weight
per
foot of
length.		 No. of
threads
per
Inch
of
screw.		 Length
perfect
screw.
  1⁄8   .405 .068 0 .269 1 .272 0 .848 9 .440 14 .15   .129   .0572 2500 .   .243 27   0.19
  1⁄4   .54 .088 0 .364 1 .696 1 .144 7 .075 10 .50   .229   .1041 1385 .   .422 18   0.29
  3⁄8   .675 .091 0 .493 2 .121 1 .552 5 .657 7 .67   .358   .1916 751 .5   .561 18   0.30
  1⁄2   .840 .109 0 .622 2 .652 1 .957 4 .502 6 .13   .554   .3048 472 .4   .845 14   0.39
  3⁄4 1 .050 .113 0 .824 3 .299 2 .589 3 .637 4 .635   .866   .5333 270 .0 1 .126 14   0.40
1   1 .315 .134 1 .047 4 .134 3 .292 2 .903 3 .679 1 .357   .8627 166 .9 1 .670 11 1⁄2 0.51
1 1⁄4 1 .660 .140 1 .38 5 .215 4 .335 2 .301 2 .768 2 .164 1 .496 96 .25 2 .258 11 1⁄2 0.54
1 1⁄2 1 .90 .145 1 .61 5 .969 5 .061 2 .010 2 .371 2 .835 2 .038 70 .65 2 .694 11 1⁄2 0.55
2   2 .375 .154 2 .067 7 .461 6 .494 1 .611 1 .848 4 .430 3 .355 42 .36 3 .667 11 1⁄2 0.58
2 1⁄2 2 .875 .204 2 .467 9 .032 7 .754 1 .328 1 .547 6 .491 4 .783 30 .11 5 .773 8   0.89
3   3 .50 .217 3 .066 10 .996 9 .636 1 .091 1 .245 9 .621 7 .388 19 .40 7 .547 8   0.95
3 1⁄2 4 .0 .226 3 .548 12 .566 11 .146   .955 1 .077 12 .566 9 .837 14 .56 9 .055 8   1.00
4   4 .50 .237 4 .026 14 .137 12 .648   .849 0 .949 15 .901 12 .730 11 .31 10 .728 8   1.05
4 1⁄2 5 .0 .247 4 .506 15 .708 14 .153   .765 0 .848 19 .635 15 .939 9 .03 12 .492 8   1.10
5   5 .563 .259 5 .045 17 .475 15 .849   .629 0 .757 24 .299 19 .990 7 .20 14 .564 8   1.16
6   6 .625 .280 5 .065 20 .813 19 .054   .577 0 .630 34 .471 28 .889 4 .98 18 .767 8   1.26
7   7 .625 .301 7 .023 23 .954 22 .063   .505 0 .544 45 .663 38 .737 3 .72 23 .410 8   1.36
8   8 .625 .322 7 .981 27 .096 25 .076   .444 0 .478 58 .426 50 .039 2 .88 28 .348 8   1.46
9   9 .688 .344 9 .00 30 .433 28 .277   .394 0 .425 73 .715 63 .633 2 .26 34 .677 8   1.57
10   10 .750 .366 10 .018 33 .772 31 .475   .355 0 .381 90 .762 78 .838 1 .80 40 .641 8   1.68

Thread taper three-fourths inch to one foot.

All pipe below 11⁄2 inches is butt-welded, and proved to 300 pounds per square inch; 11⁄2 inch and above is lap-welded and proved to 500 pounds per square inch.

STANDARDS FOR WIRE GAUGES IN USE IN THE UNITED STATES.
Dimensions of Sizes in Decimal Parts of an Inch.

Number
of Wire
Gauge.		 American
or
Brown
&
Sharpe.		 Birming-
ham,
or
Stubs’
Wire.		 Washburn
& Moen
Mfg. Co.,
Worces-
ter, Ms.		 Impe-
rial
Wire
Gauge.		 Stubs’
Steel
Wire.		 U. S.
Stand.
for
Plate.		 Number
of Wire
Gauge.
000000 .... .... .... .464 .... .46875 000000
00000 .... .... .... .432 .... .4375 00000
0000 .46 .454 .3938 .400 .... .40625 0000
000 .40964 .425 .3625 .372 .... .375 000
00 .3648 .38 .3310 .348 .... .34375 00
0 .32486 .34 .3065 .324 .... .3125 0
1 .2893 .3 .2830 .300 .227 .28125 1
2 .25763 .284 .2625 .276 .219 .265625 2
3 .22942 .259 .2437 .252 .212 .25 3
4 .20431 .238 .2253 .232 .207 .234375 4
5 .18194 .22 .2070 .212 .204 .21875 5
6 .16202 .203 .1920 .192 .201 .203125 6
7 .14428 .18 .1770 .176 .199 .1875 7
8 .12849 .165 .1620 .160 .197 .171875 8
9 .11443 .148 .1483 .144 .194 .15625 9
10 .10189 .134 .1350 .128 .191 .140625 10
11 .090742 .12 .1205 .116 .188 .125 11
12 .080808 .109 .1055 .104 .185 .109375 12
13 .071961 .095 .0915 .092 .182 .09375 13
14 .064084 .083 .0800 .080 .180 .078125 14
15 .057068 .072 .0720 .072 .178 .0703125 15
16 .05082 .065 .0625 .064 .175 .0625 16
17 .045257 .058 .0540 .056 .172 .05625 17
18 .040303 .049 .0475 .048 .168 .05 18
19 .03589 .042 .0410 .040 .164 .04375 19
20 .031961 .035 .0348 .036 .161 .0375 20
21 .028462 .032 .03175 .032 .157 .034375 21
22 .025347 .028 .0286 .028 .155 .03125 22
23 .022571 .025 .0258 .024 .153 .028125 23
24 .0201 .022 .0230 .022 .151 .025 24
25 .0179 .02 .0204 .020 .148 .021875 25
26 .01594 .018 .0181 .018 .146 .01875 26
27 .014195 .016 .0173 .0164 .143 .0171875 27
28 .012641 .014 .0162 .0149 .139 .015625 28
29 .011257 .013 .0150 .0136 .134 .0140625 29
30 .010025 .012 .0140 .0124 .127 .0125 30
31 .008928 .01 .0132 .0116 .120 .0109375 31
32 .00795 .009 .0128 .0108 .115 .01015625 32
33 .00708 .008 .0118 .0100 .112 .009375 33
34 .006304 .007 .0104 .0092 .110 .00859375 34
35 .005614 .005 .0095 .0084 .108 .0078125 35
36 .005 .004 .0090 .0076 .106 .00703125 36
37 .004453 .... .... .0068 .103 .006640625 37
38 .003965 .... .... .0060 .101 .00625 38
39 .003531 .... .... .0052 .099 .... 39
40 .003144 .... .... .0048 .097 .... 40

UNITED STATES STANDARD SIZES OF BOLTS.

DIAM-
ETER.		 Distance
Across
Flats,
Square
and
Hex.		 Distance
Across
Corners,
Hex.		 Thickness
of Head.
  1⁄4″   1⁄2″   9⁄16″   1⁄4″
  3⁄8   11⁄16   25⁄32   11⁄32
  1⁄2   7⁄8 1     7⁄16
  5⁄8 1 1⁄16 1 7⁄32   17⁄32
  3⁄4 1 1⁄4 1 7⁄16   5⁄8
  7⁄8 1 7⁄16 1 21⁄32   21⁄32
1   1 5⁄8 1 7⁄8   13⁄16
1 1⁄8 1 13⁄16 2 3⁄32   29⁄32
1 1⁄4 2   2 5⁄16 1  
1 3⁄8 2 3⁄16 2 1⁄2 1 3⁄32
1 1⁄2 2 3⁄8 2 3⁄4 1 3⁄16
1 5⁄8 2 9⁄16 2 15⁄16 1 9⁄32
1 3⁄4 2 3⁄4 3 3⁄16 1 3⁄8
1 7⁄8 2 15⁄16 3 13⁄32 1 15⁄32
2   3 1⁄8 3 5⁄8 1 9⁄16
2 1⁄4 3 1⁄2 4 1⁄16 1 3⁄4
2 1⁄2 3 7⁄8 4 1⁄2 1 15⁄16
2 3⁄4 4 1⁄4 4 7⁄8 2 1⁄8
3   4 5⁄8 5 11⁄32 2 5⁄16

UNITED STATES STANDARD SCREW THREAD GAUGE.

Gauge

Fig. 316.