NOMENCLATURE OF THREADS
out s
ide
diam
eter
AngleLead
Pitch
Roo
t / C
ore
dia
Flank
Crest Root
Nom
inal
dia
met
er
RIVETED JOINTS
Plates joined together by means of a riveted joint cannot be disconnected without Chipping –off rivet heads from one side of the joint
Butt joint:- In a butt joint edges of the plates to be connected butt against each other and the joint between them is covered by butt –plates
Rivets are used to fasten permanently two or more plates or pieces of metal .Joints made with rivets are called riveted joints.
They are commonly used in ship building and for the Construction of steel buildings ,bridges ,boilers ,tanks, etc.
Types of riveted jointsLap joint:- In a lap joint the plates to be connected over lap each other
Double riveted lap joint
P
AA
1.5d
dt
t
Pr 1.5d
LDouble riveted (zig zag) lap joint
A A
Pd
P
1.5d
Pr 1.5d
t
Simple forms of these bolts can quickly forged from mild steel or wrought iron bar .These bolts are suspended in hole and cement grout is then poured to fill up the space around them
FOUNDATION BOLTS
These bolts are used for fixing machines to their foundations.
T-headed bolt
0.8D0.8D
0.8DD 1.
8D
Hook bolt
0.8D
D
Counter sunk headed bolt
0.8D
D
Cup headed bolt
D
0.8D
PREVENTION OF ROTATION OF BOLTS
PREVENTING ROTATION OF BRASSES
By making a step rectangular on the one outside and fitting inside a corresponding hole
SNUGS
By snugs at the top fitting inside the cap. the oil hole is drilled inside a corresponding hole.
PREVENTING ROTATION OF BRASSES
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