Design of Socket & Spigot Cotter Joint

 DESIGN PROCEDURE OF SOCKET & SPIGOT COTTER JOINT

The socket and spigot cotter joint is shown in Fig.

Let,

P = Load carried by the rods, 

d = Diameter of the rods, 

d1 = Outside diameter of socket, 

d2 = Diameter of spigot or inside diameter of socket, 

d3 = Outside diameter of spigot collar, 

t 1 = Thickness of spigot collar, 

d4 = Diameter of socket collar, 

c = Thickness of socket collar, 

b = Mean width of cotter, 

t = Thickness of cotter, 

l = Length of cotter, 

a = Distance from the end of the slot to the end of rod, 

σt = Permissible tensile stress for the rods material, 

τ = Permissible shear stress for the cotter material, 

and σc = Permissible crushing stress for the cotter material.

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Example 1. Design and draw a cotter joint to support a load varying from 30 kN in compression to 30 kN in tension. The material used is carbon steel for which the following allowable stresses may be used. The load is applied statically. Tensile stress = compressive stress = 50 MPa ; shear stress = 35 MPa and crushing stress = 90 MPa.

Solution:

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