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.

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