Download - Threads&Threaded Joints 2007-08
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Threads-
Terminology in threads-
External thread-
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Internal threads
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Different Types of Thread profiles:-
1. Square Threads.
2. V-threads.
3. ACME Threads
4. Buttress Threads.
5. Whit!rth threads
Thread Conventions
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Square Threads
V- threads
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ACME threads
Buttress threads
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hit!orth Threads
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STA"DA#D #E$#ESE"TAT%&" &' T(#EADS
Visible screw threads - "!r #isi$les%re threads& the %rests !' threads sh!uld $e de'ined $( a %!ntinu!us thi%)
line *t(+e A,& and the r!!ts !' threads $( a %!ntinu!us thin line *t(+e B,.
Hidden screw threads- "!r hidden s%re threads& the %rests and the
r!!ts sh!uld $e de'ined $( dashed lines.
Sections of threaded parts "!r threaded +arts sh!n in se%ti!n& hat%hin
sh!uld $e extended t! the line de'inin the %rest !' the thread.
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End view of screw threads - n an end #ie !' a #isi$le s%re thread& the thread
r!!ts sh!uld $e re+resented $( a +!rti!n !' a %ir%le& dran ith a %!ntinu!us thin
line *t(+e B,& !' lenth a++r!xi/atel( three-quarters !' the %ir%u/'eren%e.
The a$!#e %!n#enti!ns a++l( t! asse/$lies !' threaded +arts. 0!e#er&
externall( threaded +arts sh!uld ala(s $e sh!n %!#erin internall(threaded +arts and sh!uld n!t hidden $( the/
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METIC T0EA STAAS
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I"IE T0EA STAAS
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(e)agonal headed *olt
Square headed *olt
enerall( used hen the head is t! $e a%%!//!dated in re%ess. e%ess is als!
/ade u+ !' square sha+e t! +re#ent r!tati!n !' $!lt.
Square ne%) t! a#!id r!tati!n !'
B!lt hile tihtenin a nut.
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Cylindri+al or +heese headed *olt
sed hen-6S+a%e '!r a%%!//!datin $!lt head
is less.6se !' s+anner is t! $e a#!ided.
!tati!n !' $!lt is +re#ented $(
/eans !' a +in
T- headed *olt
67ri/aril( used in /a%hine t!!l ta$les.6"its in T sl!t +r!#ided !n the/.
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Counter sun, headed *olt
6sed in a++li%ati!n here head !'
$!lt /ust n!t +r!8e%t a$!#e the sur'a%e
!' %!nne%ted +ie%e.6It /a( +r!#ided ith the ne%) !' square
%r!ss-se%ti!n.
(oo, Bolt
6This $!lt +asses thr!uh a h!le !' !ne +ie%e
!nl(. !ther +ie%e is ri++ed $( the h!!) sha+ed
$!lt head.6This is used hen it is n!t +!ssi$le t! drill h!le
in the +ie%e ad8!inin $!lt head.
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Eye Bolt-
6B!lt has %ir%ular rin as its head.6sed as an a++lian%e t! li't hea#(
/a%hines.
Stud-
It %!nsists !' a %(lindri%al shan) threaded
at $!th sides.
The nut end is threaded '!r a lenth slihtl(
M!re than thi%)ness !' nut.
Metal end M is threaded t! lenth at least equal
T! dia/eter !' stud.
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asher
'itting of stud
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(e)agonal nut
Dra!ing a he)agonal nut
A++r!x Std. i/ensi!ns
T9: W91.5;3//:
91.4
!uh ule i/ensi!ns
T9: 91.5
istan%e a%r!ss dia!nall(
!++!site %!rners< 2
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"uts
T!//(Bar = 7in
s+anner
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.o+,ing arrangements for nuts
6ue t! #i$rati!ns& there is ala(s a tenden%( t! '!r nuts t! et sla%).6The nut A is 'irst s%reed !n $!lt as tihtl( as +!ssi$le.6The nut B is then s%reed !n the $!lt till it t!u%hes the t!+ !' nut A.
6The nut B is hel+ $( s+anner and nut A is turned $a%)ards thr!uh 'e derees.6The t! nuts are hen%e l!%)ed tihtl( due t! edin a%ti!n aainst ea%h
!ther and $!lt.6ut B %arries all the l!ad& hen%e it is /ade thi%)er than nut A. enerall( nut A
thi%)ness is )e+t >.? ti/es !' thi%)ness !' nut B
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M!lten
@ead =sul+hur
'oundation *olts
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'oundation *olts
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B!lt t(+e 7i%ture A++li%ati!n
Square headed Bearins !' sha't
C(lindri%al headedBi end !' %!nne%tin r!ds&
e%%entri%s& et%.
T-headed Ma%hine t!!l ta$les& $!iler/!untins su%h as st!+#al#e& 'eed %he%) #al#e et%.
C!unter-sun) headedWhere the $!lt head /ustn!t +r!8e%t a$!#e sur'a%e
E(e $!lt "!r li'tin hea#( /a%hines
Stud
C!nne%t %(linder %!#er t!enine %(linder
Situati!ns here there is n!
s+a%e '!r $!lt heads
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