Cool Mechanical

Imperial Drill Sizes ⁄ Decimal Equivalents
Drill Size	Inches	Tap Size	Drill Size	Inches	Tap Size	Drill Size	Inches	Tap Size
80	.0135		35	.1100		H	.2660
79	.0145		34	.1110		I	.2720	5/16 - 24
1/64	.0156		33	.1113	6 - 40	J	.2770
78	.0160		32	.1160		K	.2810
77	.0180		31	.1200		9/32	.2812
76	.0200		1/8	.1250		L	.2900
75	.0210		3.2mm	.1260	(1/8 slip fit)	M	.2950
74	.0225		30	.1285		19/64	.2969
73	.0240		29	.1360	8 - 32, 36	N	.3020
72	.0250		28	.1405		5/16	.3125	3/8 - 16
71	.0260	000 - 120	9/64	.1406		O	.3160
70	.0280		27	.1440		P	.3230
69	.0292		26	.1470		21/64	.3281
68	.0310		25	.1495	10 - 24	Q	.3320	3/8 - 24
1/32	.0312		24	.1520		R	.3390
67	.0320		23	.1540		11/32	.3438
66	.0330		5/32	.1562		S	.3480
65	.0350	00 - 90	22	.1570		T	.3580
64	.0360		21	.1590	10 - 32	23/64	.3594
63	.0370		20	.1610		U	.3680	7/16 - 14
62	.0380		19	.1660		3/8	.3750
61	.0390		18	.1695		V	.3770
60	.0400		11/64	.1719		W	.3860
59	.0410		17	.1730		25/64	.3906	7/16 - 20
58	.0420		16	.1770	12 - 24	X	.3970
57	.0430		15	.1800		Y	.4040
56	.0465		14	.1820		13/32	.4062
3/64	.0469		13	.1850		Z	.4130
55	.0520	0 - 80	3/16	.1875		27/64	.4219	1/2 - 13
54	.0550		12	.1890		7/16	.4375
53	.0595		11	.1910		29/64	.4531	1/2 - 20
1/16	.0625	1 - 64,72	10	.1935		15/32	.4688
52	.0635		9	.1960		31/64	.4844
51	.0670		8	.1990		1/2	.5000	(12.7mm)
50	.0700		7	.2010	1/4 - 20	13mm	.5118
49	.0730	2 - 56,64	13/64	.2031		17/32	.5312
48	.0760		6	.2040		9/16	.5625
5/64	.0781		5	.2055		19/32	.5932
47	.0785		4	.2090		5/8	.6250
46	.0810	3 - 48	3	.2130	1/4 - 28	21/32	.6562
45	.0820		7/32	.2188		11/16	.6875
44	.0860	3 - 56	2	.2210		23/32	.7187
43	.0890		1	.2280		3/4	.7500
42	.0935		A	.2340		23/32	.7812
3/32	.0938	4 - 40	15/64	.2344		13/16	.8125
41	.0960	4 - 48	B	.2380		27/32	.8438
40	.0980		C	.2420		7/8	.8750
39	.0995		D	.2460		29/32	.9062
38	.1015	5 - 40	1/4 E	.2500		15/16	.9375
37	.1040	5 - 44	F	.2570	5/16 - 18	31/32	.9688
36	.1065	6 - 32	G	.2610
7/64	.1094		17/64	.2656		1	1.0000

Imperial Drill Sizes ⁄ Decimal Equivalents

Drill Size

Inches

Tap Size

Drill Size

Inches

Tap Size

Drill Size

Inches

Tap Size

.0135

.1100

.2660

.0145

.1110

.2720

5/16 - 24

1/64

.0156

.1113

6 - 40

.2770

.0160

.1160

.2810

.0180

.1200

9/32

.2812

.0200

1/8

.1250

.2900

.0210

3.2mm

.1260

(1/8 slip fit)

.2950

.0225

.1285

19/64

.2969

.0240

.1360

8 - 32, 36

.3020

.0250

.1405

5/16

.3125

3/8 - 16

.0260

000 - 120

9/64

.1406

.3160

.0280

.1440

.3230

.0292

.1470

21/64

.3281

.0310

.1495

10 - 24

.3320

3/8 - 24

1/32

.0312

.1520

.3390

.0320

.1540

11/32

.3438

.0330

5/32

.1562

.3480

.0350

00 - 90

.1570

.3580

.0360

.1590

10 - 32

23/64

.3594

.0370

.1610

.3680

7/16 - 14

.0380

.1660

3/8

.3750

.0390

.1695

.3770

.0400

11/64

.1719

.3860

.0410

.1730

25/64

.3906

7/16 - 20

.0420

.1770

12 - 24

.3970

.0430

.1800

.4040

.0465

.1820

13/32

.4062

3/64

.0469

.1850

.4130

.0520

0 - 80

3/16

.1875

27/64

.4219

1/2 - 13

.0550

.1890

7/16

.4375

.0595

.1910

29/64

.4531

1/2 - 20

1/16

.0625

1 - 64,72

.1935

15/32

.4688

.0635

.1960

31/64

.4844

.0670

.1990

1/2

.5000

(12.7mm)

.0700

.2010

1/4 - 20

13mm

.5118

.0730

2 - 56,64

13/64

.2031

17/32

.5312

.0760

.2040

9/16

.5625

5/64

.0781

.2055

19/32

.5932

.0785

.2090

5/8

.6250

.0810

3 - 48

.2130

1/4 - 28

21/32

.6562

.0820

7/32

.2188

11/16

.6875

.0860

3 - 56

.2210

23/32

.7187

.0890

.2280

3/4

.7500

.0935

.2340

23/32

.7812

3/32

.0938

4 - 40

15/64

.2344

13/16

.8125

.0960

4 - 48

.2380

27/32

.8438

.0980

.2420

7/8

.8750

.0995

.2460

29/32

.9062

.1015

5 - 40

1/4 E

.2500

15/16

.9375

.1040

5 - 44

.2570

5/16 - 18

31/32

.9688

.1065

6 - 32

.2610

7/64

.1094

17/64

.2656

1.0000

SAE Screw Sizes
Size	Fraction	Inches	Metric
#0	1/16	.0625	1.5
#1	5/64	.0781	1.8
#2	3/32	.0938	2.0
#3	7/64	.1094	2.8
#4	7/64	.1094	2.8
#5	1/8	.1250	3.1
#6	9/64	.1406	3.3
#8	5/32	.1562	4.2
#10	3/16	.1875	4.8
#12	7/32	.2188	5.5
#14	1/4	.2500	6.3

SAE Screw Sizes

Size

Fraction

Inches

Metric

1/16

.0625

1.5

5/64

.0781

1.8

3/32

.0938

2.0

7/64

.1094

2.8

7/64

.1094

2.8

1/8

.1250

3.1

9/64

.1406

3.3

5/32

.1562

4.2

#10

3/16

.1875

4.8

#12

7/32

.2188

5.5

#14

1/4

.2500

6.3

Metric Equivalents
Metric	Inches	Metric	Inches	Metric	Inches
1 mm	.0394	10 mm	.3937	19 mm	.7480
2 mm	.0787	11 mm	.4331	20 mm	.7874
3 mm	.1181	12 mm	.4724	21 mm	.8268
4 mm	.1575	13 mm	.5118	22 mm	.8661
5 mm	.1969	14 mm	.5512	23 mm	.9055
6 mm	.2362	15 mm	.5906	24 mm	.9449
7 mm	.2756	16 mm	.6299	25 mm	.9843
8 mm	.3150	17 mm	.6693
9 mm	.3543	18 mm	.7087	25.4 mm	1.0000

Metric Equivalents

Metric

Inches

Metric

Inches

Metric

Inches

1 mm

.0394

10 mm

.3937

19 mm

.7480

2 mm

.0787

11 mm

.4331

20 mm

.7874

3 mm

.1181

12 mm

.4724

21 mm

.8268

4 mm

.1575

13 mm

.5118

22 mm

.8661

5 mm

.1969

14 mm

.5512

23 mm

.9055

6 mm

.2362

15 mm

.5906

24 mm

.9449

7 mm

.2756

16 mm

.6299

25 mm

.9843

8 mm

.3150

17 mm

.6693

9 mm

.3543

18 mm

.7087

25.4 mm

1.0000

Imperial
SAE Hex Bolts & Nuts
Thread Size	Thread Inches	Nut / Wrench Size
#10 - 32	.1875	3/8
1/4 - 20	.2500	7/16
5/16 - 18	.3125	1/2
3/8 - 16	.3750	9/16
7/16 - 20	.4375	11/16, 5/8
1/2 - 20	.5000	3/4

Imperial
SAE Hex Bolts & Nuts

Thread Size

Thread Inches

Nut / Wrench Size

#10 - 32

.1875

3/8

1/4 - 20

.2500

7/16

5/16 - 18

.3125

1/2

3/8 - 16

.3750

9/16

7/16 - 20

.4375

11/16, 5/8

1/2 - 20

.5000

3/4

Metric
ISO Hex Bolts & Nuts
Thread Size	Thread Inches	Nut / Wrench Size
M6 - 1.0	.2362	10mm, 10mm
M7 - 1.0	.2756	11mm, 11mm
M8 - 1.25	.3150	13mm, 12mm
M10 - 1.5	.3937	17mm, 14mm
M12 - 1.75	.4724	18mm, 17mm
M14 - 2.0	.5512	22mm, 19mm

Metric
ISO Hex Bolts & Nuts

Thread Size

Thread Inches

Nut / Wrench Size

M6 - 1.0

.2362

10mm, 10mm

M7 - 1.0

.2756

11mm, 11mm

M8 - 1.25

.3150

13mm, 12mm

M10 - 1.5

.3937

17mm, 14mm

M12 - 1.75

.4724

18mm, 17mm

M14 - 2.0

.5512

22mm, 19mm

SAE - Society of Automotive Enginners
ISO - International Organization for Standardization
MS - Machine Screws
JIS - Japanese Industrial Standard

he Black Diamonds on your tape measure divide an 8 foot length into FIVE equal spaces (19.2 inches). They are used in Optimum Value Engineering (OVE) projects for building cheaper housing. They can also be used in building roof Trusses that are lighter yet nearly as strong as Trusses with 6 spaces (16") per 8 foot length.

16" - Standard spacing for studs, 6 spaces ⁄ 8 feet
◆ - 19.2" - Truss Spacing, 5 spaces ⁄ 8 feet
24" - Widest spacing for studs, 4 spaces ⁄ 8 feet

U.S.A. Ring Sizes
Ring Size	Dia. Inches	Dia. mm
4	.586	14.88
4½	.602	15.29
5	.618	15.70
5½	.634	16.10
6	.650	16.51
6½	.666	16.92
7	.682	17.32
7½	.698	17.32
8	.714	18.14
8½	.730	18.54
9	.746	18.95
9½	.762	19.35
10	.778	19.76
10½	.794	20.17
11	.810	20.57
11½	.826	20.98
12	.842	21.39
12½	.858	21.79
13	.874	22.20

U.S.A. Ring Sizes

Ring Size

Dia. Inches

Dia. mm

.586

14.88

4½

.602

15.29

.618

15.70

5½

.634

16.10

.650

16.51

6½

.666

16.92

.682

17.32

7½

.698

17.32

.714

18.14

8½

.730

18.54

.746

18.95

9½

.762

19.35

.778

19.76

10½

.794

20.17

.810

20.57

11½

.826

20.98

.842

21.39

12½

.858

21.79

.874

22.20