metric bolt

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B I Fasteners

 We Manufacture Bolts  in Bulk Quantity
 
Metric Bolt Torque
a. USA industry is now using metric fasteners extensively. The remainder of the world uses ISO metric fasteners almost exclusively, due to their superiority in proportions, fatigue strength, pitch, size and specification designations, and international availability.
b. The Thomas Register lists hundreds of firms under Metric Fasteners, Metric Screws, and Metric Bolts. The Industrial Fasteners Institute (IFI) has guides for fastener types and producers.
c. Metric fasteners for all aerospace applications are made readily and easily available at "rock" bottom price to all NASA and contractor employees via NASA GSFC Fastener Inventory.
d. Metric fastener size designation.

 

US Bolts
Maximum Torque, in foot-pounds, for clean, dry threads

Bolt size - Thread pitch

Grade 2

Grade 5

Grade 8

1/4-20

6

10

12

1/4-28

7

12

15

5/16-18

13

20

24

5/16-24

14

22

27

3/8-16

23

36

44

3/8-24

26

40

48

7/16-14

37

52

63

7/16-20

41

57

70

1/2-13

57

80

98

1/2-20

64

90

110

9/16-12

82

120

145

9/16-18

91

135

165

5/8-11

111

165

210

5/8-18

128

200

245

3/4-10

200

285

335

3/4-16

223

315

370



Metric Bolts
Maximum Torque, in foot-pounds, for clean, dry threads

 

Bolt size

Low Grade

Grade 8.8

Grade 10.9

Grade 12.9

6mm

3-5

7

10

12

8mm

8-12

17

24

29

10mm

15-22

33

47

57

12mm

39

59

83

100

14mm

60

101

131

158

16mm

60-94

146

202

247

18mm

60-130

201

283

340

20mm

166-188

285

401

482







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