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Manufactures of Quality Unibender ®
Metal Bending Tools and equipment.







Steel gauge chart
 *
Round Steel Tubing Size (O.D.)
*
Rectangle Steel Tubing Size (O.D.)
*
Square Steel Tubing Size (O.D.)
*
Hexagon Steel Tubing Size (O.D.)
*
Tap drill bit size (NC and NF)
 *
Tap drill bit size (Metric)
 *
Standard Drill Size - Inches
 *
Fractional Inches to Decimal Equivalents
 *
Fractional and /or decimal inches and metric millimeters


STEEL GAUGE CHART for
Cold & Hot Rolled Steel Sheets
Gauge
Number		 Manufacturers'
Standard Inches		 Hot
Rolled		 Cold
Rolled
3 .2391 ± .009 N/A
4 .2242 ± .009 N/A
5 .2092 ± .009 N/A
6 .1943 ± .009 N/A
7 .1793 ± .008 N/A
8 .1644 ± .008 N/A
9 .1495 ± .008 N/A
10 .1345 ± .008 ± .006
11 .1196 ± .008 ± .006
12 .1046 ± .008 ± .006
13 .0897 ± .007 ± .005
14 .0747 ± .007 ± .005
15 .0673 ± .007 ± .005
16 .0598 ± .006 ± .005
17 .0538 N/A ± .004
18 .0478 N/A ± .004
19 .0418 N/A ± .004
20 .0359 N/A ± .003
21 .0329 N/A ± .003
22 .0299 N/A ± .003
23 .0269 N/A ± .003
24 .0239 N/A ± .003
25 .0209 N/A ± .003
26 .0179 N/A ± .002
27 .0164 N/A ± .002
28 .0149 N/A ± .002
29 .0135 N/A ± .002
30 .0120 N/A ± .002


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Round Steel Tubing

SIZE (O.D.)


0.590
0.625 (5/8)
0.660
0.687 (11/16)
0.706
0.718
0.750 (3/4)
0.800
0.812 (13/16)
0.820
0.843 (27/32)
0.850
0.862
0.875 (7/8)
0.880
0.900
0.910
0.937 (15/16)
0.960
0.975
0.995
1.000
1.062 (1-1/16)
1.110
1.125 (1-1/8)
1.1875 (1-3/16)
1.250 (1-1/4)
1.290
1.312 (1-5/16)
1.360
1.375 (1-3/8)
1.425
1.437 (1-7/16)
1.500 (1-1/2)
1.562 (1 9/16)
1.625 (1-5/8)
1.687 (1-11/16)
1.750 (1-3/4)
1.781
1.812 (1-13/10)
1.844
1.875 (1-7/8)
1.900
1.910
2.000
2.015
2.062 (2-1/16)
2.125 (2-1/8)
2.187 (2-3/16)
2.250 (2-1/4)
2.312 (2-5/16)
2.326
2.375 (2-3/8)
2.500 (2- 1/2)
2.625 (2-5/8)
2.750 (2-3/4)
2.875 (2-7/8)
2.950
3.000


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Rectangle Steel Tubing

SIZE (O.D.)

0.500 x 0.750 (1/2 x 3/4)
0.500 x 0.875 (1/2 X 7/8)
0.500 x 1.000 (1/2 x 1)
0.500 x 1.250 (1/2 x 1-1/4)
0.500 x 1.375 (1/2 x 1-3/8)
0.500 x 1.500 (1/2 x 1-1/2)
0.500 x 1.750 (1/2 x 1-3/4)
0.625 x 0.750 (5/8 x 3/4)
0.625 x 0.875 (5/8 x 7/8)
0.625 x 1.000 (5/8 x 1)
0.625 x 1.125 (5/8 x 1-1/8)
0.625 x 1.250 (5/8 x 1-1/4)
0.625 x 1.375 (5/8 x 1-3/8)
0.625 x 1.500 (5/8 x 1-1/2)
0.625 x 1.625 (5/8 x 1-5/8)
0.625 x 1.875 (5/8 x 1-7/8)
0.625 x 2.000 (5/8 x 2)
0.750 x 0.875 (3/4 x 7/8)
0.750 x 1.000 (3/4 X 1)
0.750 x 1.125 (3/4 x 1-1/8)
0.750 x 1.250 (3/4 x 1-1/4)
0.750 x 1.500 (3/4 x 1-1/2)
0.750 x 2.000 (3/4 x 2)
0.812 x 1.000 (13/16 x 1)
0.875 x 1.000 (7/8 x 1)
0.875 x 1.125 (7/8 x 1-1/8) 0.875 x 1.250 (7/8 x 1-1/4)
0.875 x 1.876 (7/8 x 1-7/8)
1.000 x 1.125 (1 x 1-1/8)
1.000 x 1.250 (1 x 1-1/4)
1.000 x 1.500 (1 x 1-1/2)
1.000 x 1.750 (1 x 1-3/4)
1.000 x 2
1.000 x 2.250 (1 x 2-1/4)
1.000 x 2.500 (1 x 2-1/2)
1.000 x 2.750 (1 x 2-3/4)
1.125 x 1.750 (1-1/8 x 1-3/4)
1.250 x 1.500 (1-1/4 x 1-1/2)
1.250 x 1.625 (1-1/4 x 1-5/8)
1.250 x 1.750 (1-1/4 x 1-3/4)
1.250 x 2.000 (1-1/4 x 2)
1.250 x 2.500 (1-1/4 x 2-1/2)
1.250 x 2.687 (1-1/4 x 2-11/16)
1.000 x 3
1.500 x 1.375 (1-1/2 x 1-3/8)
1.500 x 1.750 (1-1/2 x 1-3/4)
1.500 x 2.000 (1-1/2 x 2)
1.500 x 2.500 (1-1/2 x 2-1/2)
1.575 x 0.787
1.625 x 2.000 (1-5/8 x 2)
1.750 x 2.250 (1-3/4 x 2-1/4)
1.875 x 2.000 (1-7/8 x 2)


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Square Steel Tubing

SIZE (O.D.)
0.625 (5/8)
0.750 (3/4)
0.812 (13/16)
0.850
0.875 (7/8)
1.000
1.125 (1-1/8)
1.187 (1-3/16)
1.20
1.250 (1-1/4)
1.375 (1-3/8)
1.500 (1-1/2)
1.750 (1-3/4)
1.875 (1-7/8)
2.0
2.125 (2-1/8)
2.250 (2-1/4)


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Hexagon Steel Tubing

SIZE (O.D.)


0.4375 (7/16)
0.6875 (11/16)
1.00


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INCH SIZES - NATIONAL COARSE

----------------------------
TAP		DRILL
SIZE		SIZE
----------------------------
#1-64		#53 
#2-56 		#51 
#3-48 		5/64" 
#4-40 		#43 
#5-40 		#39 
#6-32 		#36 
#8-32 		#29 
#10-24 		#25 
#12-24 		#17 
1/4-20 		#7 
5/16-18 	F 
3/8-16 		5/16 
7/16-14		U 
1/2-13 		27/64 
9/16-12 	31/64 
5/8-11 		17/32 
3/4-10 		21/32 
7/8-9 		49/64 
1"-8 		7/8 
1-1/8-7 	63/64 
1-1/4-7 	1-7/64 
1-1/2-6 	1-11/32 
1-3/4-5 	1-35/64 
2"-4-1/2 	1-25/32
----------------------------

INCH SIZES - NATIONAL FINE

----------------------------
TAP		DRILL
SIZE 		SIZE
----------------------------
#0-80 		3/64" 
#1-72 		#53
#2-64 		#50
#3-56 		#46
#4-48 		#42
#5-44 		#37
#6-40 		#33
#8-36 		#29
#10-32 		#21
#12-28 		#15
1/4-28 		#3
5/16-24 	I
3/8-24 		Q
7/16-20 	W
1/2-20 		29/64
9/16-18 	33/64
5/8-18 		37/64
3/4-16 		11/16
7/8-14 		13/16
1"-14 		15/16
1-1/8-12 	1-3/64
1-1/4-12 	1-11/64
1-1/2-12 	1-27/64
1-3/4-12 	1-43/64
2"-12 		1-59/64
----------------------------

TAPER PIPE SIZES - NPT

----------------------------
TAP 		DRILL
SIZE 		SIZE
----------------------------
1/8-27 		R
1/4-18 		7/16
3/8-18 		37/64
1/2-14 		23/32
3/4-14 		59/64
1"-11-1/2 	1-5/32
1-1/4-11-1/2 	1-1/2
1-1/2-11-1/2 	1-47/64
2"-11-1/2	 2-7/32
2-1/2-8 	2-5/8
3"-8 		3-1/4
3-1/2-8 	3-3/4
4"-8 		4-1/4
----------------------------

STRAIGHT PIPE SIZES - NPS

----------------------------
TAP	 	DRILL
SIZE 		SIZE
----------------------------
1/8-27 		S
1/4-18 		29/64
3/8-18 		19/32
1/2-14 		47/64
3/4-14 		15/16
1"-11-1/2 	1-3/16
1-1/4-11-1/2 	1-33/64
1-1/2-11-1/2	1-3/4
2"-11-1/2	2-7/32
2-1/2-8 	2-21/32
3"-8 		3-9/32
3-1/2-8 	3-25/32
4"-8 		4-9/32
----------------------------


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METRIC COARSE SIZES

----------------------------
TAP                 DRILL
SIZE                SIZE
----------------------------
1mm x .25            .75mm
1.1 x .25            .85
1.2 x .25            .95
1.4 x .3            1.1
1.6 x .35           1.25
1.7 x .35           1.3
1.8 x .35           1.45
2 x .4              1.6
2.2 x .45           1.75
2.5 x .45           2.05
3 x .5              2.5
3.5 x .6            2.9
4 x .7              3.3
4.5 x .75           3.7
5 x .8              4.2
6 x 1               5
7 x 1               6
8 x 1.25            6.8
9 x 1.25            7.8
10 x 1.5            8.5
11 x 1.5            9.5
12 x 1.75           10.2
14 x 2              12
16 x 2              14
18 x 2.5            15.5
20 x 2.5            17.5
22 x 2.5            19.5
24 x 3              21
27 x 3              24
30 x 3.5            26.5
33 x 3.5            29.5
36 x 4              32
39 x 4              35
----------------------------

METRIC FINE SIZES

----------------------------
TAP                 DRILL
SIZE                SIZE
----------------------------
4 mm x .35          3.6mm
4 x .5              3.5
5 x .5              4.5
6 x .5              5.5
6 x .75             5.25
7 x .75             6.25
8 x .5              7
8 x .75             7.25
8 x 1               7
9 x 1               8
10 x .75            9.25
10 x 1              9
10 x 1.25           8.8 
11 x 1              10
12 x .75            11.25
12 x 1              11
12 x 1.5            10.5
14 x 1              13
14 x 1.25           12.8
14 x 1.5            12.5
16 x 1              15
16 x 1.5            14.5
18 x 1              17
18 x 2              16
20 x 1              19
20 x 1.5            18.5
20 x 2              18
22 x 1              21
22 x 1.5            20.5
22 x 2              20
24 x 1.5            22.5
24 x 2              22
26 x 1.5            24.5
27 x 1.5            25.5
27 x 2              25 
28 x 1.5            26.5
30 x 1.5            28.5
30 x 2              28
33 x 2              31
36 x 3              33
39 x 3              36
----------------------------


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Standard Drill Sizes - Inches

Drill
Size
.
Decimal
Equiv.
.
Drill
Size
.
Decimal
Equiv.
.
Drill
Size
.
Decimal
Equiv.
.
Drill
Size
.
Decimal
Equiv.
80 =

.0135

   43 = .089   8 = .199   25/64 = .3906
79 = .0145   42 = .0935   7 = .201   X = .397
1/64 = .0156   3/32 = .0938   13/64 = .2031   Y = .404
78 = .016   41 = .096   6 = .204   13/32 = .4063
77 = .018   40 = .098   5 = .2055   Z = .413
76 = .020   39 = .0995   4 = .209   27/64 = .4219
75 = .021   38 = .1015   3 = .213   7/16 = .4375
74 = .0225   37 = .104   7/32 = .2188   29/64 = .4531
73 = .024   36 = .1065   2 = .221   15/32 = .4688
72 = .025   7/64 = .1094   1 = .228   31/64 = .4844
71 = .026   35 = .110   A = .234   1/2 = .500
70 = .028   34 = .111   15/64 = .2344   33/64 = .5156
69 = .0292   33 = .113   B = .238   17/32 = .5313
68 = .031   32 = .116   C = .242   35/64 = .5469
1/32 = .0313   31 = .120   D = .246   9/16 = .5625
67 = .032   1/8 = .1250   1/4 (E) = .250   37/64 = .5781
66 = .033   30 = .1285   F = .257   19/32 = .5938
65 = .035   29 = .136   G = .261   39/64 = .6094
64 = .036   28 = .1405   17/64 = .2656   5/8 = .625
63 = .037   9/64 = .1406   H = .266   41/64 = .6406
62 = .038   27 = .144   I = .272   21/32 = .6563
61 = .039   26 = .147   J = .277   43/64 = .6719
60 = .040   25 = .1495   K = .281   11/16 = .6875
59 = .041   24 = .152   9/32 = .2813   45/64 = .7031
58 = .042   23 = .154   L = .290   23/32 = .7188
57 = .043   5/32 = .1563   M = .295   47/64 = .7344
56 = .0465   22 = .157   19/64 = .2969   3/4 = .750
3/64 = .0469   21 = .159   N = .302   49/64 = .7656
55 = .052   20 = .161   5/16 = .3125   25/32 = .7813
54 = .055   19 = .166   O = .316   51/64 = .7969
53 = .0595   18 = .1695   P = .323   13/16 = .8125
1/16 = .0625   11/64 = .1719   21/64 = .3281   53/64 = .8281
52 = .0635   17 = .173   Q = .332   27/32 = .8438
51 = .067   16 = .177   R = .339   55/64 = .8594
50 = .070   15 = .180   11/32 = .3438   7/8 = .875
49 = .073   14 = .182   S = .348   57/64 = .8906
48 = .076   13 = .185   T = .358   29/32 = .9063
5/64 = .0781   3/16 = .1875   23/64 = .3594   59/64 = .9219
47 = .0785   12 = .189   U = .368   15/16 = .9375
46 = .081   11 = .191   3/8 = .375   61/64 = .9531
45 = .082   10 = .1935   V = .377   31/32 = .9688
44 = .086   9 = .196  

W

 = .386   63/64 = .9844


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Fraction Conversion Chart
Fractional Inches to Decimal Equivalents

Fraction     Decimal     Fraction     Decimal
   1/64      .015625       33/64      .515625
   1/32      .03125        17/32      .53125
   3/64      .046875       35/64      .546875
   1/16      .0625          9/16      .5625   
   5/64      .078125       37/64      .578125
   3/32      .09375        19/32      .59375
   7/64      .109375       39/64      .609375
    1/8      .125            5/8      .625    
   9/64      .140625       41/64      .640625  
   5/32      .15625        21/32      .65625
  11/64      .171875       43/64      .67185
   3/16      .1875         11/16      .6875   
  13/64      .203125       45/64      .703125
   7/32      .21875        23/32      .71875
  15/64      .234375       47/64      .734375
    1/4      .25             3/4      .75     
  17/64      .265625       49/64      .765625
   9/32      .28125        25/32      .78125
  19/64      .296875       51/64      .796875
   5/16      .3125         13/16      .8125   
  21/64      .328125       53/64      .828125
  11/32      .34375        27/32      .84375
  23/64      .359375       55/64      .859375
    3/8      .375            7/8      .875    
  25/64      .390625       57/64      .890625  
  13/32      .40625        29/32      .90625
  27/64      .421875       59/64      .921875
   7/16      .4375         15/16      .9375   
  29/64      .453125       61/64      .953125
  15/32      .46875        31/32      .96875
  31/64      .484375       63/64      .984375
    1/2      .50               1     1.00


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The table below can be used to convert between fractional and /or decimal inches and metric millimeters.

Inches Metric
Fractional Decimal mm
. 0.0039 0.1000
. 0.0079 0.2000
. 0.0118 0.3000
1/64 0.0156 0.3969
. 0.0157 0.4000
. 0.0197 0.5000
. 0.0236 0.6000
. 0.0276 0.7000
1/32 0.0313 0.7938
. 0.0315 0.8000
. 0.0354 0.9000
. 0.0394 1.0000
. 0.0433 1.1000
3/64 0.0469 1.1906
. 0.0472 1.2000
. 0.0512 1.3000
. 0.0551 1.4000
. 0.0591 1.5000
1/16 0.0625 1.5875
. 0.0630 1.6000
. 0.0669 1.7000
. 0.0709 1.8000
. 0.0748 1.9000
5/64 0.0781 1.9844
. 0.0787 2.0000
. 0.0827 2.1000
. 0.0866 2.2000
. 0.0906 2.3000
3/32 0.0938 2.3813
. 0.0945 2.4000
. 0.0984 2.5000
7/64 0.1094 2.7781
. 0.1181 3.0000
1/8 0.1250 3.1750
. 0.1378 3.5000
9/64 0.1406 3.5719
5/32 0.1563 3.9688
. 0.1575 4.0000
11/64 0.1719 4.3656
. 0.1772 4.5000
3/16 0.1875 4.7625
. 0.1969 5.0000
13/64 0.2031 5.1594
. 0.2165 5.5000
7/32 0.2188 5.5563
15/64 0.2344 5.9531
. 0.2362 6.0000
1/4 0.2500 6.3500
. 0.2559 6.5000
17/64 0.2656 6.7469
. 0.2756 7.0000
9/32 0.2813 7.1438
. 0.2953 7.5000
19/64 0.2969 7.5406
5/16 0.3125 7.9375
. 0.3150 8.0000
21/64 0.3281 8.3344
. 0.3346 8.5000
11/32 0.3438 8.7313
. 0.3543 9.0000
23/64 0.3594 9.1281
. 0.3740 9.5000
3/8 0.3750 9.5250
25/64 0.3906 9.9219
. 0.3937 10.0000
13/32 0.4063 10.3188
. 0.4134 10.5000
27/64 0.4219 10.7156
. 0.4331 11.0000
7/16 0.4375 11.1125
. 0.4528 11.5000
29/64 0.4531 11.5094
15/32 0.4688 11.9063
. 0.4724 12.0000
31/64 0.4844 12.3031
. 0.4921 12.5000
1/2 0.5000 12.7000
. 0.5118 13.0000
33/64 0.5156 13.0969
17/32 0.5313 13.4938
. 0.5315 13.5000
35/64 0.5469 13.8906
. 0.5512 14.0000
9/16 0.5625 14.2875
. 0.5709 14.5000
37/64 0.5781 14.6844
. 0.5906 15.0000
19/32 0.5938 15.0813
39/64 0.6094 15.4781
. 0.6102 15.5000
5/8 0.6250 15.8750
. 0.6299 16.0000
41/64 0.6406 16.2719
. 0.6496 16.5000
21/32 0.6563 16.6688
. 0.6693 17.0000
43/64 0.6719 17.0656
11/16 0.6875 17.4625
. 0.6890 17.5000
45/64 0.7031 17.8594
. 0.7087 18.0000
23/32 0.7188 18.2563
. 0.7283 18.5000
47/64 0.7344 18.6531
. 0.7480 19.0000
3/4 0.7500 19.0500
49/64 0.7656 19.4469
. 0.7677 19.5000
25/32 0.7813 19.8438
. 0.7874 20.0000
51/64 0.7969 20.2406
. 0.8071 20.5000
13/16 0.8125 20.6375
. 0.8268 21.0000
53/64 0.8281 21.0344
27/32 0.8438 21.4313
. 0.8465 21.5000
55/64 0.8594 21.8281
. 0.8661 22.0000
7/8 0.8750 22.2250
. .8858 22.5000
57/64 .89063 22.6219
. .9055 23.0000
29/32 .90625 23.0188
59/64 .92188 23.4156
. .9252 23.5000
15/16 .93750 23.8125
. .9449 24.0000
61/64 .95313 24.2094
. .9646 24.5000
31/32 .96875 24.6063
. .9843 25.0000
63/64 .98438 25.0031
1 1.000 25.40
. 1.0039 25.5000
. 1.0236 26.0000
. 1.0433 26.5000
. 1.0630 27.0000
. 1.0827 27.5000
. 1.1024 28.0000
. 1.1220 28.5000
. 1.1417 29.0000
. 1.1614 29.5000
. 1.1811 30.0000
. 1.2205 31.0000
1 1/4 1.2500 31.7500
. 1.2598 32.0000
. 1.2992 33.0000
. 1.3386 34.0000
. 1.3780 35.0000
. 1.4173 36.0000
. 1.4567 37.0000
. 1.4961 38.0000
1 1/2 1.5000 38.1000
. 1.5354 39.0000
. 1.5748 40.0000
. 1.6142 41.0000
. 1.6535 42.0000
. 1.6929 43.0000
. 1.7323 44.0000
1 3/4 1.7500 44.4500
. 1.7717 45.0000
. 1.8110 46.0000
. 1.8504 47.0000
. 1.8898 48.0000
. 1.9291 49.0000
. 1.9685 50.0000
2 2.0000 50.8000
. 2.0079 51.0000
. 2.0472 52.0000
. 2.0866 53.0000
. 2.1260 54.0000
. 2.1654 55.0000
. 2.2047 56.0000
. 2.2441 57.0000
2 1/4 2.2500 57.1500
. 2.2835 58.0000
. 2.3228 59.0000
. 2.3622 60.0000
. 2.4016 61.0000
. 2.4409 62.0000
. 2.4803 63.0000
2 1/2 2.5000 63.5000
. 2.5197 64.0000
. 2.5591 65.0000
. 2.5984 66.0000
. 2.6378 67.0000
. 2.6772 68.0000
. 2.7165 69.0000
2 3/4 2.7500 69.8500
. 2.7559 70.0000
. 2.7953 71.0000
. 2.8346 72.0000
. 2.8740 73.0000
. 2.9134 74.0000
. 2.9528 75.0000
. 2.9921 76.0000
3 3.0000 76.2000
. 3.0315 77.0000
. 3.0709 78.0000
. 3.1102 79.0000
. 3.1496 80.0000
. 3.1890 81.0000
. 3.2283 82.0000
. 3.2677 83.0000
. 3.3071 84.0000
. 3.3465 85.0000
. 3.3858 86.0000
. 3.4252 87.0000
. 3.4646 88.0000
3 1/2 3.5000 88.9000
. 3.5039 89.0000
. 3.5433 90.0000
. 3.5827 91.0000
. 3.6220 92.0000
. 3.6614 93.0000
. 3.7008 94.0000
. 3.7402 95.0000
. 3.7795 96.0000
. 3.8189 97.0000
. 3.8583 98.0000
. 3.8976 99.0000
. 3.9370 100.0000
4 4.0000 101.6000
. 4.3307 110.0000
4 1/2 4.5000 114.3000
. 4.7244 120.0000
5 5.0000 127.0000
. 5.1181 130.0000
. 5.5118 140.0000
. 5.9055 150.0000
6 6.0000 152.4000
. 6.2992 160.0000
. 6.6929 170.0000
. 7.0866 180.0000
. 7.4803 190.0000
. 7.8740 200.0000
8 8.0000 203.2000
. 9.8425 250.0000
10 10.0000 254.0000
20 20.0000 508.0000
30 30.0000 762.0000
40 40.0000 1016.000
60 60.0000 1524.000
80 80.0000 2032.000
100 100.0000 2540.000


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