Tarheel Tooling & Precision Machining, Inc.
US 70 East of Smithfield
PO Box 1063
Tel 919.965.6160 | Fax 919.965.6168

Reference Data

Length Conversion | Tap Drill Size | Punch Tonnage | Punch Clearance | Shear Tonnage

   Length Conversion

Instructions:

1. Enter a value in either the left or right text box.
2. Select the units in the drop down list boxes.
3. Calculate in either direction by clicking on the arrow buttons.

 With some conversions, a loss of accuracy may occur in the least significant digits. Apply rules for scientific precision to all results! This calculator is provided as is, without any warranty. Tarheel Tooling and Precision Machining, Inc. makes no representation with respect to accuracy. Use with care and appropriate checking.

   Tap Drill Size

Size Thread Root Drill Size Decimal
1/16 64 0.0422 3/64 0.0469
1/16 72 0.0445 3/64 0.0469
5/64 60 0.0563 1/16 0.0625
5/64 72 0.0601 52 0.0635
3/32 48 0.0667 49 0.0730
3/32 50 0.0678 49 0.0730
7/64 48 0.0823 43 0.0890
1/8 32 0.0844 3/32 0.0937
1/8 40 0.0925 38 0.1015
9/64 40 0.1081 32 0.1160
5/32 32 0.1157 1/8 0.1250
5/32 36 0.1202 30 0.1285
11/64 32 0.1313 9/64 0.1406
3/16 24 0.1334 26 0.1470
Size Thread Root Drill Size Decimal
3/16 32 0.1469 22 0.1570
13/64 24 0.1490 20 0.1610
7/32 24 0.1646 16 0.1770
7/32 32 0.1782 12 0.1890
15/64 24 0.1806 10 0.1935
1/4 20 0.1850 7 0.2010
1/4 24 0.1959 4 0.2090
1/4 27 0.2019 3 0.2130
1/4 28 0.2036 3 0.2130
1/4 32 0.2094 7/32 0.2187
5/16 18 0.2403 F 0.2570
5/16 20 0.2476 17-64 0.2656
5/16 24 0.2584 I 0.2720
5/16 27 0.2644 J 0.2770
5/16 32 0.2719 9/32 0.2812
Size Thread Root Drill Size Decimal
3/8 16 0.2938 5/16 0.3125
3/8 20 0.3100 21/64 0.3281
3/8 24 0.3209 Q 0.3320
3/8 27 0.3269 R 0.3390
7/16 14 0.3447 U 0.3680
7/16 20 0.3726 25/64 0.3906
7/16 24 0.3834 X 0.3970
7/16 27 0.3894 Y 0.4040
1/2 12 0.3918 27/64 0.4219
1/2 13 0.4001 27/64 0.4219
1/2 20 0.4351 29/64 0.4531
1/2 24 0.4459 29/64 0.4531
1/2 27 0.4519 15/32 0.4687
9/16 12 0.4542 31/64 0.4844
9/16 18 0.4903 33/64 0.5156
Size Thread Root Drill Size Decimal
9/16 27 0.5144 17/32 0.5312
5/8 11 0.5069 17/32 0.5312
5/8 12 0.5168 35/64 0.5469
5/8 18 0.5528 37/64 0.5781
5/8 27 0.5769 19/32 0.5937
11/16 11 0.5694 19/32 0.5937
11/16 16 0.6063 5/8 0.6250
3/4 10 0.6201 21/32 0.6562
3/4 12 0.6418 43/64 0.6719
3/4 16 0.6688 11/16 0.6875
3/4 27 0.7019 23/32 0.7187
13/16 10 0.6826 23/32 0.7187
7/8 9 0.7307 49/64 0.7656
7/8 12 0.7668 51/64 0.7969
Size Thread Root Drill Size Decimal
7/8 14 0.7822 13/16 0.8125
7/8 18 0.8028 53/64 0.8281
7/8 27 0.8269 27/32 0.8437
15/16 9 0.7932 53/64 0.8281
1 8 0.8376 7/8 0.8750
1 12 0.8918 59/64 0.9219
1 14 0.9072 15/16 0.9375
1 27 0.9519 31/32 0.9687
1 1/8 7 0.9394 63/64 0.9844
1 1/8 12 1.0168 1 3/64 1.0469
1 1/8 12 1.1418 1 11/64 1.1719
1 3/8 6 1.1585 1 7/32 1.2187
Size Thread Root Drill Size Decimal
1 3/8 12 1.2668 1 19/64 1.2969
1 1/2 6 1.2835 1 11/32 1.3437
1 1/2 12 1.3918 1 27/64 1.4219
1 5/8 5.5 1.3888 1 29/64 1.4531
1 3/4 5 1.4902 1 9/16 1.5625
1 7/8 5 1.6152 1 11/16 1.6875
2 4.5 1.7113 1 25/32 1.7812
2 1/8 4.5 1.8363 1 29/32 1.9062
2 1/4 4.5 1.9613 21/32 2.0312
2 3/8 4 2.0502 2 1/8 2.1250
2 1/2 4 2.1752 2 1/4 2.2500

Tap Drill Sizes for Pipe Thread

Pipe Size Drill Size - Briggs Drill Size - Whitworth
1/8 11/32 5/16
1/4 7/16 27/64
3/8 19/32 9/16
1/2 23/32 11/16
3/4 15/16 29/32
1 5/32 1 1/8
1 1/4 1 1/2 1 15/32
1 1/2 1 23/32 1 25/32
2 2 3/16 2 5/32
2 1/2 2 5/8 2 25/32
3 3 1/4 3 9/32
3 1/2 3 3/4 3 3/4
4 4 1/4 4 1/4
4 1/2 4 3/4 4 3/4
5 5 5/16 5 1/4
6 6 3/8 6 1/4

   Tons of Pressure Required to Punch Mild Steel

Round
Hole
Diameter

(inches)		 .125 .188 .250 .312 .375 .437 .500 .562 .625 .687 .750 .813 .875 .937 1.00 1.50 2.00
Ga. In. Force in Tons
20
18
16
14
12
11
10
3/16
1/4
5/16
3/8
1/2		 .036
.048
.062
.075
.105
.120
.135
.188
.250
.312
.375
.500		 .4
.5
.6
.7
1.0
1.2
1.3
-
-
-
-
-		 .5
.7
.9
1.1
1.5
1.8
2.0
2.8
-
-
-
-		 .7
.9
1.2
1.5
2.1
2.4
2.6
3.7
4.9
-
-
-		 .9
1.2
1.5
1.8
2.6
2.9
3.3
4.6
6.1
7.8
-
-		 1.1
1.4
1.8
2.2
3.1
3.5
4.0
5.5
7.4
9.2
11.1
-		 1.2
1.6
2.1
2.6
3.6
4.1
4.6
6.4
8.6
10.7
12.8
-		 1.4
1.9
2.3
2.9
4.1
4.7
5.3
7.4
9.8
12.3
14.8
19.7		 1.6
2.1
2.6
3.3
4.6
5.1
5.9
8.3
11.1
13.9
16.6
22.0		 1.8
2.4
2.9
3.7
5.1
5.9
6.6
9.2
12.3
15.4
18.5
24.6		 1.9
2.6
3.2
4.0
5.7
6.2
7.3
10.1
13.5
17.0
20.2
26.9		 2.1
2.8
3.5
4.4
6.2
7.1
7.9
11.0
14.7
18.5
22.1
29.5		 2.3
3.1
3.8
4.8
6.7
7.6
8.6
12.0
16.0
20.0
23.8
31.8		 2.5
3.3
4.1
5.1
7.2
8.3
9.2
12.9
17.2
21.5
25.8
34.4		 2.6
3.5
4.4
5.5
7.7
8.8
9.9
13.8
18.4
23.0
27.5
36.8		 2.8
3.8
4.7
5.9
8.2
9.4
10.6
14.8
19.7
24.6
29.5
39.4		 4.2
5.5
7.0
8.8
12.3
14.0
15.9
22.0
34.4
43.0
51.5
68.8		 5.6
7.5
9.5
11.7
16.4
18.8
21.0
29.5
39.3
49.0
59.0
78.5

   Punch Clearance for Mild Steel

Gauge or Size Approx. Decimal Thickness Overall Clearance
(add to punch size)
30
28
26
24
22
20
18
16
14
13
12
11
1/8"
10
5/32"
8
7
3/16"
1/4"
5/16"
3/8"
1/2"
5/8"
3/4"		 .0120
.0149
.0179
.0239
.0299
.0359
.0478
.0598
.0747
.0897
.1046
.1196
.125
.1345
.156
.164
.1793
.1875
.250
.3125
.375
.500
.625
.750		 slip fit
slip fit
slip fit
.003
.003
.004
.005
.005
.006
.009
.009
.011
.011
.013
.015
.017
.021
.023
.037
.047
.157
.075
.125
.150

   Tons of Pressure Required to Shear 1 Inch Length

Metal Gauge Mild Steel Stainless Steel Brass
20
18
16
13
11
3/16"
1/4"
5/16"
3/8"
7/16"
1/2"
5/8"
3/4"
7/8"
1"		 1.01
1.25
1.75
2.50
3.25
4.25
6.25
8.00
9.50
11.00
12.50
15.75
18.75
22.00
25.00		 1.50
1.75
2.50
3.50
4.75
7.00
9.50
12.00
14.25
16.50
18.75
23.50
28.25
33.00
37.50		 0.75
1.00
1.25
2.00
2.25
3.25
4.50
5.50
6.25
7.75
8.75
11.00
13.25
15.50
17.50

 

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