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Technical Info

SI Units & Conversions for Mechanical Fasteners

Property

Unit

Symbol

Conversion

From

To

Multipy By

Length

Metre

m

Inch

mm

25.4

Centimeter

cm

Inch

cm

2.54

Millimeter

mm

Foot

mm

304.8

Mass

Kilogram

kg

Ounce

g

28.35

Gram

g

Pound

kg

0.4536

Tonne (Megagram)

t

Ton (2240 lb)

kg

984.2

Density

Kilogram per
Cubic Meter

kg/m³

Pounds per
Cubic Feet

kg/m³

16.02

Temparature

Degree
Celsius

°C

Degree
Fahrenheit

°C

(°F-32) × 5/9

Area

Square Meter

m²

Square Inch

mm²

645.2

Square Milimeter

mm²

Square Foot

m²

0.0929

Volume

Cubic Meter

m³

Cubic Inch

mm³

16387

Cubic Centimeter

cm³

Cubic Foot

m³

0.02832

Cubic Millimeter

mm³

Cubic Yard

m³

0.7645

Force

Newton

N

Ounce (Force)

N

0.278

Kilonewton

kN

Pound (Force)

kN

0.00445

Meganewton

MN

Kip

MN

0.00445

Stress

Megapascal

MPa

Pound/in² (psi)

MPa

0.0069

Newtons/sq. mm

N/m²

Kip/in² (ksi)

MPa

6.895

Torque

Newton-Meters

N-m

Inch-Ounce

N-m

0.00706

Inch-Pound

N-m

0.113

Foot-Pound

N-m

1.356

Thread Size Comparison

Metric Products

Unified Inch Products

B.S. Inch Products

Size

Major
Dia.
mm

Major Dia.
Inch

Thread
Pitch
mm

T.P.I

Size

T.P.I
UNC

T.P.I
UNF

Major
Dia.
Inch

Size

T.P.I
BSW

T.P.I
BSF

T.P.I
BA

Major
Dia.
Inch

M1.6

1.6

0.063

0.35

73

#0

-

80

0.060

-

-

-

-

-

M2.0

2

0.079

0.4

64

#1

-

72

0.073

-

-

-

-

-

-

-

-

-

-

#2

56

64

0.086

8BA

-

-

59.1

0.087

M2.5

2.5

0.098

0.45

56

#3

48

56

0.099

-

-

-

-

-

-

-

-

-

-

#4

40

48

0.112

6BA

-

-

47.9

0.110

M3

3

0.118

0.5

51

#5

40

44

0.125

1/8

40

-

-

0.125

-

-

-

-

-

-

-

-

-

5BA

-

-

43.1

0.126

-

-

-

-

-

-

32

40

0.138

4BA

-

-

38.5

0.142

M4

4

0.157

0.7

36

#8

32

36

0.164

3BA

-

-

34.8

0.161

M5

5

0.197

0.8

32

#10

24

32

0.190

3/16

24

32

-

0.187

-

-

-

-

-

-

-

-

-

2BA

-

-

31.3

0.185

-

-

-

-

-

-

-

-

-

1BA

-

-

28.2

0.209

M6

6

0.236

1

25

1/4

20

28

0.250

1/4

20

26

-

0.250

-

-

-

-

-

-

-

-

-

0BA

-

-

25.4

0.236

M8

8

0.315

1.25

20

5/16

18

24

0.313

5/16

18

22

-

0.313

M10

10

0.394

1.5

17

3/8

16

24

0.375

3/8

16

20

-

0.375

-

-

-

-

-

7/16

14

20

0.438

7/16

14

18

-

0.438

M12

12

0.472

1.75

14.5

1/2

13

20

0.500

1/2

12

16

-

0.500

M14

14

0.551

2

12.5

-

-

-

-

-

-

-

-

-

M16

16

0.63

2

12.5

5/8

11

18

0.625

5/8

11

14

-

0.625

M20

20

0.787

2.5

10

3/4

10

16

0.750

3/4

10

12

-

0.750

-

-

-

-

-

7/8

9

14

0.875

7/8

9

11

-

0.875

M24

24

0.945

3

8.5

1

8

12

1.000

1

8

10

-

1.000

-

-

-

-

-

1-1/8

7

12

1.125

1-1/8

7

9

-

1.125

M30

30

1.187

3.5

7.3

1-1/4

7

12

1.250

1-1/4

7

9

-

1.250

M36

36

1.417

4

6.4

1-1/2

6

12

1.500

1-1/2

6

8

-

1.500

M42

42

1.654

4.5

5.6

-

-

-

-

-

-

-

-

-

Recommended Tightening Torque & Shear Strength

Metric Cap Screws
Grade 12.9

BSW Cap Screws

UNC Cap Screws

Dia.

Body Double
Shear
KN

Recommended
Torque
N-m

Dia.

Body Double
Shear
(lbF)

Recommended
Torque
N-m

Dia.

Body Double
Shear
(lbF)

Recommended
Torque
N-m

3

11.0

2.1

1.8

2800

2.26

#6

3400

3.16

4

19.7

4.6

-

-

-

#8

4800

5.54

5

30.6

9.5

3/16

6300

7.0

#10

6450

7.23

6

44.1

16

1/4

11200

17.1

1/4

11200

17.0

8

78.4

39

5/16

17500

34.7

5/16

17500

34.5

10

122

77

3/8

25200

61.9

3/8

25200

61.6

12

170

135

1/2

42300

144

1/2

42300

147

14

231

215

-

-

-

-

-

-

16

300

330

5/8

66200

287

5/8

66200

286

20

470

650

3/4

95400

500

3/4

95400

497

24

680

1109

1

169600

1175

1

169600

1175

30

1060

2250

1¼

265000

1944

1¼

266000

1944

36

1530

3850

1½

381000

3865

1½

381000

3865

42

2080

6270

-

-

-

-

-

-

*All information is strictly informative. The UPL Group accepts no responsiblity for incorrect data

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