Sunday, May 14, 2017

Shear and Tension Capacity of stainless steel bolts

Introduction

The shear capacity of a bolt, Psb, should be taken as: 
Psb = psb As 
where:
psb is the shear strength of bolt 
As is the shear area, usually taken as the tensile stress area, unless it can be guaranteed that the threaded portion will be excluded from the shear plane, in which case it can be taken as the unthreaded shank area.

The tension capacity Pnom is given by Pnom = 0.8 ptb At where:

 ptb= 0.7 Usb (U is the tensile strength)


The following tables gives the shear strengths (in N/mm2) of stainless steel bolts and shear capacities (in kN) for bolts of diameter M10 to M24.

Shear strengths of bolts in clearance holes

Bolt grade (BS EN ISO 3506)

Property class (BS EN ISO 3506)

Shear strength psb (N/mm2)

A1, A2 and A4

50

145

70

311

80

384

Shear and tension capacities of bolts in clearance holes

Bolt size

Property class

(BS EN ISO 3506)

Shear capacity (1)

Psb (kN)

Tension Capacity

Pnom (kN)

M10

50

 8.4

9.8

70 

18.0

20.9

80

22.3

26.0

M12

50

12.2

14.2

70

26.2

30.3

80

32.4

37.8

M16

50

22.7

26.4

70

48.7

56.5

80

60.3

70.3

M20

50

35.5

41.2

70

76.1

88.2

80

94.1

109.8

M24

50

51.1

59.3

70

109.6

127.1

80

135.6

158.1

M27

50

66.4

77.1

70

142.5 

165.3 

80

176.3

205.6 

M30

50

81.2

94.2 

70

174.2

202.0 

80

215.5 

251.3 

M33

50

100.5 

116.6 

70

215.5

249.9 

80

266.6

310.8 

M36

50

118.3

137.2 

70

253.7

294.2 

80

313.8 

365.9 

M39

50

141.3 

164.0 

70

303.0 

351.4 

80

374.9

437.1 

(1) The shear area As has been taken as the tensile stress area of the bolt, At


Note: These values of shear capacity should be used in conjunction with FACTORED loads. The relevant load factors can be obtained from BS 5950 The structural use of steelwork in building, Part 1 Code of practice for design - rolled and welded sections.

 

Related Links

1.  Suppliers of Stainless Steel Fasteners

 

Source: http://www.bssa.org.uk/

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