MACHINE PARTS

NOMENCLATURE OF THREADS

out s

ide

diam

eter

AngleLead

Pitch

Roo

t / C

ore

dia

Flank

Crest Root

Nom

inal

dia

met

er

INTERNAL THREAD

EXTERNAL THREAD

SQUARE THREAD

T= d = 0.5P

T P

90 d

TYPES OF THREADS

D55° P

dd/

6

D=0.96P d=0.64P

WHITWORTH THREAD

TYPES OF THREADS

p

T=0.3707pd

d= 0.5p + 0.25 mm

ACME THREAD

T

29°

TYPES OF THREADS

BUTTRESS THREAD

Dd

P

F

d/8

d/8

D = P d = 0.75P

45°

TYPES OF THREADS

D

P R

R=0.25P D=0.5P

KNUCKLE THREAD

TYPES OF THREADS

24

HEXAGONAL HEADED BOLT WITH

HEXAGONAL NUT AND WASHER

52

40

20100

243

48

w

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

P

A

1.5d

A

L

1.5d

Single riveted butt joint

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.

D

EYE FOUNDATION BOLT

RAG FOUNDATION BOLT

48

72

120

LEWIS FOUNDATION BOLT

ø2424

16

36

105

LIFTING EYE-BOLT

1.5D

1.5D

2D0.4D

0.8D

2D

EYE BOLT

DD 2D

2D

Flanged nut

TYPES OF NUTS

D

0.25

D

2.2D

D

Cap nut

D0.

5D

0.25

D

1.5D+3

D

Dome nut

D

D0.

5D

Capstan nut

1.8D

DD

0.2D

Wing nut

0.5D

1.8D

1.5D

D

Ring nut

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

Cup headed bolt Square headed bolt

Cheese headed bolt

SPLIT-PIN

LOCKING ARRANGEMENT

FOR NUTS

LOCK NUT OR CHECK NUT

D0.

6D

D

NUT BOLT WITH SPRING WASHER

CASTLE NUT WITH A SPLIT PIN

SLOTTED NUT WITH A SPLIT PIN

COTTER JOINT

KNUCKLE JOINT

FLANGE COUPLING

PROTECTIVE FLANGE COUPLING

BUSHED BEARING

FOOT STEP BEARING

PLUMMER BLOCK

PREVENTING ROTATION OF BRASSES

By making a step rectangular on the one outside and fitting inside a corresponding hole

SNUGS

By snugs at the side

PREVENTING ROTATION OF BRASSES

SNUGS

By snugs at the top fitting inside the cap. the oil hole is drilled inside a corresponding hole.

PREVENTING ROTATION OF BRASSES

by making the step octagonal on the outside and fitting inside a corresponding hole.

PREVENTING ROTATION OF BRASSES