25 Bolt Threads

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32

BOLT THREADSThreads versus Strength of BoltEXHAUST STACK

ENGNEERNG !"th the S#READSHEET

Copyright 2006 America !ociety o" Ci#il $gieers

A % C & $ ' ( ) * + ,

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BOLT THREADS

$"gure %&'( Bolt threads and )olt )od*+

e"erece: A*!C th $itio Part 4 - 3 tesio o gross a

!ectio + - 3 page 5 - 2 a some commo sese

& (+%&,, i America *stitte o" !teel Costrctio 7A*!C

& threas 1.211 i

- threas/ich

pitch 0.142 i istace 9etee threas

) 0.123 i 0.866 P

)/6 0.0206 i

)/8 0.0155 i

, root 1.04 i iameter to threa roots

A tesile 0.61

& tesile 1.1108 i

pitchagle 2.285 egrees

$"gure %&'. The thread /ross'se/t"on+

;o ill ote that this maal cotais oly examples

$"gure %&'% The )olt thread s0"ral a templates.

fro1 an AUTOCad DRA2NG+ <here are o pro9lems or example pro9lems =st

i2

GROSS

DA3ETER

ROOT

DA3ETER

#45

#TCH

H45

(-4%6 H

H 7 ,+588 #

NET AREA

DA3ETER

-1.5000 -1.0000 -0.5000 0.0000 0.5000 1.0000

-1.5000

-1.0000

-0.5000

0.0000

0.5000

1.0000

1.5000



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BOLT THREADSThreads versus Strength of Bolt Christy

EXHAUST STACK 06/28/16

22:03



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opportities to o egieerig a ma>e a li#ig.

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BOLT STRENGTH

Shear A/ross Bolt

& (+%& i gross iameter

- cot m9er o" threas per ich

(rae A.&6 Gr+ BD type A*!C ?ales

44 >si

A gross 1.22 @ 7& /2B

3.14 71.250 /2B

? gross &6+, 9 o gross sectio o" 9olt

44 1.22

A threas 0.6 0.8547& - 0.43 /B

0.854 71.250 - 0.43 /B

? threae 6%+8 9 at threae portio o" 9olt

44 0.6

$"gure %&'6 Th"s "s a /ut through an elevat"on and the result"ng

se/t"on sho!"ng the area of the thread:s;+

BOLT GRADE <ALUES

Calclate ?ales AISC Values

(rae

yiel ltimate threas i plae in plane grossA.8 36 58 1.14 .86 12.6 19.1 9.9 12.8 car9o steel ith/

A.,- 60 1.8 10.2 13.2 20 10 13.2 car9o steel ith

A.%& to 1D (rae 5 % 2 120 3.6 20.4 26.4 44 21 30

A.%&'( 1 1/8D to 1 1/2D 81 105 34.65 1.85 23.1 44 1. 23.1

A6=, (rae 8 1/2D to 1 1/2D 120 150 4.5 25.5 33 54 28 40

A.&6 Gr+ BD 1/2D to 2 1/2D 120 150 4.5 25.5 33 54 28 40 alloy Eeche F

steel ith/ithot

AS .,6 SS 65 100 33 1 22 stailess steel

A36 ca 9e prchase at the harare store as allthrea ro.

A354 (rae %& is sally speci"ie as iterchagea9le ith A40 9olts. A354 (r. %& is o"te

"rishe as a high-stregth achor 9olt a is also se i high temperatre coitios li>e hea 9olt hea

yor car egieGs hea 9olts. m9er o" threas

<alues Cal/ulated 0er the ASC N"nth Ed"t"on '' Thread Str"00"ng Shear (rae A.%& type A*!C ?ales

44 >si tesio

21 >si shear throgh threas i plae Shear

& gross (+%& i gross iameter o" 9olt

- threas/ich $ORCE

) 0.124 i

, root 1.05 i least iameter

threa 0.101 i actal ith o" threa pitch - pitch/4

'/threa 5.68 >/threa '# area o" threa i shear

21 >si 0.5 0.101 ich 1.05 i @

Shear

<hreas - threas pro#ie

actal ith o" threa 0.101D

< threas 3.88 > threas 5.68 > pitch 1/ 0.143D

't '

0.33

i2

i2

'y '

'

t '

# 0.1'

'

# 0.22'

F

t F

y threads F

y

't

'#



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0.6 44

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SU33AR>

&iameter 1.2500 i gross iameter

cot m9er o" threas per ich

(rae A325

44 >si tesio

21 >si shear

Thread Str"00"ng Shear

<hreas threas pro#ie

< strippig 3.88 > strippig capacity

Bolt Tens"on

< gross 54.00 > o gross sectio o" 9olt< threas 42.64 > at threae portio o" 9olt

Shear A/ross Bolt

? gross 54.0 > o gross sectio o" 9olt

? threae 42.6 > at threae portio o" 9olt

Loads

< reEire .&+8, >

? reEire (+.5 > su1 of !"nd 0ressure at .&+8 10h dur"ng vorte? shedd"ng

CO3BNED LOADS $OR THE UNT> E@UATON

$or Shear and Tens"on on Threaded #ort"on of the Bolt

< go#ers 3.88 > mi73.88 42.64

Para9olic Cr#e

<emsio !hear !m

735.60 /3.88B H 71.4 /42.6B 0. H 0.001

0. H 0.001 0.8

!traight ie

735.60 /3.88 H 71.4 /42.6 0.83 H 0.032

0.83 H 0.032 0.25 $"gure %&'8 Tens"on and shear through the )olt threads+

$or Shear Through the Unthreaded #ort"on of the Bolt

and Tens"on on Threaded #ort"on of the Bolt

Para9olic Cr#e

<emsio !hear !m

735.60 /3.88B H 71.4 /54.0B 0. H 0.001

0. H 0.001 0.

!traight ie

735.60 /3.88 H 71.4 /54.0 0. H 0.026

0. H 0.026 0.822 $"gure %&'- Tens"on and shear through the )olt )od*+

't

'#



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BOLT THREADS ASC N"nth Ed"t"on $"rst #r"nt"ng :-45=;

<hrea 't/ threa

Area tesio o tesio o !hear o" threa per threa

&iameter oot (ross oot <esile <hreas gross threae Plae i shear <hreas le

9ar stoc> , !tress per ich Pitch 7omial 7et area legth plae eEire reE

ich ich i > > i >

1/4 0.18 III III III %, 0.050 III III 0.035 0.351 III

3/8 0.28 III III III (8 0.063 III III 0.046 0.61 III

1/2 0.406 III III III (. 0.0 III III 0.05 1.15 III

5/8 0.514 III III III (( 0.01 III III 0.0682 1.34 III

3/4 0.62 III III III (, 0.100 III III 0.050 2.32 III

/8 0.3 III III III = 0.111 III III 0.0833 3.04 III

1 0.84 0.854 0.551 0.606 5 0.125 34.6 24.2 0.038 3.2 8.80 1

1 1/8 0.50 0.4 0.63 0.63 - 0.143 43. 30.5 0.101 5.036 8.68 1

1 1/4 1.05 1.22 0.80 0.6 - 0.143 54.0 3.1 0.101 5.6 .4 1

1 3/8 1.11 1.485 1.054 1.155 8 0.16 65.3 46.4 0.1250 .243 .02 1

1 1/2 1.26 1.6 1.24 1.405 8 0.16 .8 56. 0.1250 8.016 .0 1

1 3/4 1.505 2.405 1.44 1.8 & 0.200 105.8 6. 0.1500 11.10 .4 1

2 1.2 3.142 2.300 2.48 6+& 0.222 138.2 101.2 0.166 14.242 .1 2

Co10ar"son of #u)l"shed and Cal/ulated Threaded Areas

?ales i the A*!C ith $itio 'irst Pritig 7/8 #ary "rom

the "ormla 0.8547& -1.3 /B "or the root area A,. <he

i""erece 9etee the "irst a seco A*!C pritigs is sho9elo a i the graph. *C$ calclatios eEal the re#ise

A*!C #ales.

A*!C A*!C 1st e

&iameter <hreas *C$ 7/8

9ar stoc> per ich

ich iB iB J i""erece

Kl #ales

0.25 %, 0.02 0.032 (8+,

0.35 (8 0.068 0.08 (.+( e#ise #ales

0.5 (. 0.126 0.142 ((+&

0.625 (( 0.202 0.226 (,+-

0.5 (, 0.302 0.334 =+8

0.85 = 0.41 0.462 =+.1 5 0.551 0.606 =+(

1.125 - 0.63 0.63 =+%

1.25 - 0.80 0.6 5+%

1.35 8 1.054 1.16 =+%

1.5 8 1.24 1.41 5+.

1.5 & 1.44 1.0 5+% $"gure %&'5 <ER$CATON GRA#H

2 6+& 2.300 2.50 5+,

<he iagram sho i the A*!C ith $itio a pre#ios

eitios is iaccrate. <he gross iameter o" the 9olt threas is

e#er as great as the 9olt stoc> "rom hich they ere ct or

rolle.

't '

t '

# area

A& A

,

i2 i2 i2

A, A

,

0 0.5 1 1.5 20.000

0.500

1.000

1.500

2.000

2.500

3.000

D"a1eter

A r e a



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BOLT GRADES

A354 (rae %& 9olt stoc> is the same as

A40 heae 9olts a )olt 1a

!A$ (rae 8 9olts

six spo>e sym9ol.

h"gh str

$"gure %&'= The old )olt 1ar9 for Grade BD )olts+ nut gra

$"gure %&'(, An older )olt !"th the s0o9es and "n"t"als

re0resent"ng #ortland Bolt Co10an*+

STEEL GRADES!teels (rae ;iel <esile age

A36 36 58 - 80 car9o steel

A53 35 60 mi

A500 A 33 45 mi

A500 % 42 58 mi

A501 36 58 mi

A52 50 55 42 60 - 85 car9o steel

A52 42 42 60 mi high stregth lo alloy

A52 50 50 65 mi

A588 L 4D 50 0 mi high stregth lo alloy

A0 36 36 58 - 80

A0 50 50 65 mi A!< esta9lishe A2 i 18 to replace/pgrae A36 a A52

A0 50M 50 0 mi a is commoly pro#ie i lie o" A36. A13 50 50 65 mi

A2 50 65 A2 is proce i the N! "rom recycle steel a scrap i arc "

Bolt to )e nstalled

$"gure %&'(( The ( (4% )olt "n an e0"foa1 "nsulat"on sleeve "s sho!n

here !"th a (, L)+ ha11er and h"t !ren/h+ The surve*ors rod "s used for

referen/e+

$pi"oam slee#es pipes a plastic pipes are se to pre#et cocrete 9o ith

<hreae 9olt stoc> may 9e mar>e BD or ith the



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the legth o" the 9olt 9etee the ts.

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25 Bolt Threads