Tiêu chuẩn kỹ thuật của mỹ về bu lông, đai ốc astm a325, a490.pdf

Bolts & Nuts Sdn. Bhd.

171-175, JALAN SAN PENG, 55200 KUALA LUMPUR.
TEL: 03-2218211 {6 LINES), 03-2217122 (6 LINES)
FAX NO: 03-2210724, 03-2210807

AANA

PRAR ABR 2
Syarikat Central

=D

ARBRE
S MSIE 2

Specialists in High Tensile Botts
& Mute % Othar F^stanarn,


CONTENTS

—

=

3. Chemical

Requirements...........................

3-1

Chemicalrequirements for A325 bolts..................

3-2

Chemical requirements for A490 bolls..................

3-3.

Chemical requirements for Nufs.......................

3-4.

Chemical requirements for Washers

4. Mechanical
4-]

beeen cence

eee eens

Requirements.........................

Mechanical properties of bolts

. ."

eee een eee

4-1-1

Tensile requirernents for Full Size Bolts................

4-1-2

Tensile requirements for Specimens Machined from Bolts

4-1-3

Hardness of bolts

..

2.0.0.0...
00 e eee
eee nee

4-2.

Mechanical properties of nuts..................

4-3

Hardness of washers

"¬=

.......... " —..

5. Dimensions and Markings ........... "
5-1

Dimensions of bolts, nuts and washers.......-...........

:


1. Scope
High strength bolts for structural steel joints in the ASTM
and A490.
Mitsuboshi

Industries,

Standard are specified in A325
-

Ltd. is the leading manufacturer

of these high strength structural
bolts with the most advanced facilities of production and quality control system in Japan.
Mitsuboshi’s A325 and A490 high strength bolts with NKYM brand, covering Type 1, Type
2 and Type 3 with size range, 1/2 to 1-1/2 in., are enjoying ever increasing reputation
among engineering

and

architectural

people in building and bridge construction

home and abroad.

industries

,

Materials and

Manufacture

The steel for bolts, nuts and washers is made by the open-hearth, basic-oxygen, or electric
furnace process.
Bolts, nuts and washers are heat treated under uniform conditions
They are quenched in oil or in a suitable liquid and then tempered.
Threads of all bolts are rolled.

described in Table

1.

When the galvanized bolts are specified, the bolts are hot dip zinc coated in accordance with
the requirements for Class C of ASTM A153.
The suitable grades and surface finishes of nut and wahser for each type of bolt are as
follows:
Bolt Type

-

1

and

and 2, 2, Galvanized
Galvani

F436 carbon

A.

563,

, DH

DH oror A194,A194, 2H, , Galvani
Galvanized

steel for

Type 1&2
bolts
F436 and

A563, C3

3
A490

Washer

A563, C, Plain

land 2, Plain

A325

Nut grade and finish

1 and 2, Plain

A563, DH or A194, 2H, Plain

weathering

3

A563, DH3

Type 3

:

steel for

om

Table 1. Conditions of heat treatment
Bolt type

Quenching

Tempering

A325 Type 1

860~900

WQ

470 ~ 530

WC

A325 Type 2

850~900

WQ

470~ 530

WC

A325 ‘Type 3

860~900

WQ

470 ~ 530

WC

A490 Type1

830~ 880

OQ

530~ 600

WC

A490 Type 2

850~900

WQ

380~450

WC

A490 Type 3

860~900

WQ

480 ~ 530

WC


Bolts, nuts and washers
in Table 2 to 5.

conform

“

*

Requirements

3. Chemical

to the requirements

of chemical composition described

3-1 Chemical requirements for A325 bolts
Table 2. Chemical requirements for A325 bolts
Bolt type

Chemical composition (%)

c

Mn

|} P max|S

max

12) martensite stee!|~0.23 | min [004] 905]

na| Xa

Note:

Si

Cu

:

_

Ni

Cr

_

{| Vmin | Bmin

- | - | - | - | - |-0005

[255.990 Tons] one | 25, [ 889, |.295, | 259, [0m | -

1. There are 6 classes, A, B, C, D, E and F, of weathering steel in A325, Type 3 and the above
steel conforms to the Class C.
2. When specified, other class of weathering steel is specially available.

3-2 Chemical requirements for A490 bolts
Table 3. Chemical requirements for A490 bolts

T-t|

|

|

Bolt type

Cc

Mn ]P max Saat te |r|

Alloy steel

| ĐU |

|004|004|

—

T2 | marsaste deel| ~634| min [004|005J

ĐEN

Note:

mm

-

_

—

orMo

-

|B min

|e

=| -| -| -

|.0005

IEaPiriEiEiEiEriF

1. Thesteel for Type 1 bolts shall contain sufficient alloying elements to qualify it as an alloy steel.
2. Carbon content for size 1-1/2 in. of Type 1 is in 0.35 to 0.53.

3-3 Chemical requirements for Nuts
Table 4.

Chemical requirements for nuts

Nut

grad

UE Brace

Cc
0.55
max

A563 - €

0.15

Chemical composition (%)

Mn | Pmax | S max
0612 |

-

01

_

Si

-

015 |

| 0.80

—

Cu

Ni

Cr

ụ

-

-

-

-

020 | 025 |

0430 | 0.020

A563 C3 | ~.o2z | ~ịa3s | 0035 | 9040 | ~o3o | ~0.50 | ~0.50 | ~0.50 | min
A563

DH3 |

020 |

„. 0.53

040

min

1

0.046

~

0.050

020 | 0.60
ase3 DH | 220.)
96° | 0.040 | 0.050
A194 2H

0.40

min

— | 0040 | 0.050

020 | 0.20 |
min

min

-

—

-

-

_

0.45

min

~

-

-

—

~

—

3-4 Chemical requirements for Washers
Table 5. Chemical requirements for washers
Washer type
F436
F436

Note:

Carbon steel
Weathering steel

P max

S max

Chemical composition (%)
Si
. Cr

Ni

Cu

0.040

0.050

—

_

_

=

0.040

0.050

|0.15~ 0.30]

0.45 ~ 0.65]

0.25 ~ 0.45|

0.25 ~ 0.45

Weathering steel washers may also be manufactured from the weathering steel described in Table 2.


Mechanical Requirements
4-1 Mechanical
4-1-1

properties of bolts:

Tensile requirements for Full-Size Bolts

Table 6. Tensile requirements for Full Size Bolts

Tensile Strength”, Ibf

Bolt Size,

Threads per | Stress

Inch and

Area;

—

Proof LoadP, Ibf

Alternate Proof

Length Measure-

Yield Strength

Load”, min, lbf

. 1

|

A490

A525

A490

A325

A490

A325

A490

C3

C-4

C5

C-6

C7

C-8

C9

C-10

-

17,050]

21,300

-

24,150}

12,050|

17,050)

13,050]

18,500

0.226 |

27,100]

33,900

-

38,400 |

19,200]

27,100|

20,500)

29,400

40,100 |

50,100

-

56,800 |

28,400]

40,100]

30,700]

43,400

®- 9UNC | 0.462 |

55,450]

69,300

_

78,550 |

39,250|

55,450|

42,500 |

60,100

1- 8UNC |

0.606 |

72,700}

90,900

_

103,000|

51,500|

72,700}

55,750 |

78,800

1⁄4- JUNC |

0.763 |

80,100 | 114,450

-

129,700 |

56,450]

91,550]

61,800]

99,200

1%- 8UN

0.790 ;

82,950 | 118,500

=

134,300 |

58,450]

94,800}

64,000 | 102,700

1⁄4 TUNC | 0.969 | 101,700 | 145,350

-

164,750 |

71,700 | 116,300 |

78,500 | 126,000

1%4- 8UN

1.000 | 105,000 | 150,000

_

170,000 |

74,000 | 120,000}

81,000 | 130,000

1%- 6UNC |

1.155 | 121,300 | 173,250

-

196,350 |

85,450 | 138,600 |

93,550 | 150,200

1%- 8UN

1/233 | 129,500 | 185,000

_

209,600 |

91,250 | 148,000 |

99,870 ¡ 160,300

1%- 6UNC |

1.405 | 147,500 | 210,750

-

238,850 | 104,000 | 168,600 | 113,800 | 182,600

14- 8UN

1.492 | 156,700 | 223,800

=

253,650 | 110,400 | 175,050

%-11UNC |

|

%-10UNC

|
-

a)

| 0.334 |

120,850

4
,

%-13UNC | 0.142 |

.

|

Method

ment Method

°

.

A325
C2

Column 1

Max.

Min,

in

Series
Designation

|

:

ee

4.

194,000

The stress area is calculated as follows:

As = 0.7854 [D — (0.9743/n)]?

where:
-*

b)

D
n

=nominal bolt size
= threads per inch

~

.

Loads tabulated are based on the following.
Bolt size

⁄

As =stress area, in?

c3

1⁄2 to 1inel. | 120,000 psi

11⁄4 to 11⁄2 | 105,000 psi

C-4

C-6

150,000 psi | 170,000 psi

C-7

85,000 psi

74, 000 psi

C-8

co

92,000 psi
"
120,000 psi ———-—

81,000 psi|

Cc-10

130,000 psi

|

]

|


Tensile requirements for Specimens Machined from Bolts

4-1-2

Table 7.
min.

:

max.

Yield strength |
(0.2 % Offset)
+
+
min. psi

Tensile strength, psi

Grade and bolt
size, In.
>
.
over 1-1/4

105,000

—

81,000

14

35

A490

1/2 to 1-1/2

150,000

170,000

130,000

14

40

ị
:

Hardness of Bolts
Hardness requirements for Bolts

Table 8.

Hardness Number

Grade and bolt

max.

1/2 tol

248

331

24

'

|

A325

1-1/8 to 1-1/2

223

293

19

1/2 to 1-1/2

311

352

33

A490

Ị

max.

min,

min.

m

'

Rockwell C

Brinell

size,

|

Reduction of
Area,
„
min. %

A325

4-1-3

ị

Elongation in 2
in. or 50 mm,
.
min. %

i

35

-

31

|

38

ị

i

;

4-2 Mechanical properties of nuts

i
|

Proof load and Hardness requirements for Nuts

Table 9.
Grade

Nominal nut

of

size,
in.

Nut

Hardness

Proof load stress, ksi

Non-galvanized
nuts

Rockwell

Brinell

‹

Galvanized

min.

max.

min.

max.

A563

C

1/2 to 1-1/2

144

144

143

352

B78

C38

A563

C3

1/2 to 1-1/2

144

1444

143

352

B78

C38

A563

DH3 |

1/2 to 1-1/2

175

175

248

352

C24

C38

A563

DH

1/2 to 1-1/2

175

175

248

352

C24

C38

A194

2H

1/2 to 1-1/2

175

175

248

352

C24

C38

4-3 Hardness of washers
Table 10.

Hardness requirements for Washers
Rockwell C
Finish

min.

max.

Non-galvanized

38

45

Galvanized

26

45


_ 5, Dimensions and Markings
5-1 Dimensions of bolts, nuts, and washers

Fig. 1

en

-

t

-

-

-

Shapes and dimensions of bolts, nuts and washers conform to the dimensional requirements
of heavy hex structural boltings described in Table 11.

Threads are the Unified Coarse Thread Series as specified in ANSI B 1.1. and have Class 2A
tolerances. When specified, 8 pitch thread series may be used on bolts over 1 in. in diameter.
Tolerances on the nominal length of the bolts are as follows.
Nom.

bolt size

Nom.

bolt length

3/4 tol

5/8

1/2

1-1/8 to 1-1/2

tolerance on length

thru 6 in.

—0.12

„ —0.12

—0.19

—0.25

over 6 in.

"0.19

— 0.25

—- 0.25

— 0,25

5-2 Markings
Markings for NK YM’s high strength bolts, nuts and washers are as shown in Fig. 2 to 4.
Fig. 2 Bolts

A325 `
Type 1

Type 2

Type 3

Type 1

p49

Lens
Fig. 3

Fig. 4 Washers

Nuts

AS63C

A563

C3

A194

2H

A563

DH3

For T-1, 2

For T-3


1/2

5/8

3/4

7/8

1

1-1/8

1-1/4

1-3/8

1-1/2

0.515

0.642

0.768

0.895

1.022

1.149

1.277

1.404

1.531

0.482

0.605

0.729

0.852

0.976

1.098

1.223

1.345

0.875

1.062

1.250

1.438

1.625

1.812

2.000

2.188

2.375

min.

0.850

1.031

1.212

1.394

1.575

1.756

1.938

2.119

2.300

max.

1,010

1.227

1.443

1.660

1.876

2.093

2.309

2.526

2.742

min.

0.969

1.175

1.383

1.589

1.796

2.002

2.209

2.416

2.622

max. |

0.323

0.403

0.480

- 0.563

0.627

0.718

0.813

0.878

0.974

min.

0.302

0.378

0.455

0.531

0.591

0.658

0.749

0.810

0.902

max

0.031

0.062

0.062

0.062

0.093

0.093

0.093

0.093

0.093

min.

0.009

0.021

0.021

0.031

0.062

0.062

0.062

0.062

0.062

1.507

1.75

2.00

2.00

2.25

2.25

0.31

0.34

0.38

0,44

9.44

max. |
®

min.
max. |

®

°
Bott
H

®
Lt]

1.470

1.00

1.25

1.38

Y | max. |

0.19

0.22

0.25

0,875

1.062

1,250

1.438

1.625

1.812

2.000

2.188

2.375

min.

0.850

1,031

1,212

1.394

1.575

1.756

1,938

2.119

2.300

max

1.010

1.227

1.443

1.660

1,876

2.093

2.309

2,526

2.742

min

0.969

1.175

1.382

1.589

1,796

2.002

2.209

2,416

2.622

max. |

0.504

0.631

0.758

0.885

1.012

1,139

1.251

1.378

1.505

min.

0.464

0.587

0.710

0.833

0.956

1.079

1.187

1.310

1.433

D}nom.|

1.063

1313 | 1.469

1./7ã40%|

2.000

2.250

2.500

2.750

3.000

d|nom.|

0.531

0.688

0.813

0.938

1.125

1.250

1.375

1.500

1.625

0,177

0.177

0.177

0.177

0.177

0.177

0.177

0.177

0.177

0,097

0.122

0.122

0.136

0.136

0.136

0.136

0.136

0.136

®

°

,

Washer

-|

basic |

max. |

Nat

unit: inch

max. |
‘

min.

0.28

+

_—

Dimensions of bolts, nuts and washers

L——

Table 11.


" 6. Weights of ASTM A325 and A490 heavy hex structural
bolts with heavy hex nuts.
(Approximate weight of 100 steel bolts and nuts)

Diameter |

(2

(Inches)

Length

(nches)

wl56]

1/2

kg

ve

5/8
Ib

|. kg |

ib. |

2k

3/4

kg

1b

kg |

1
1-1/4
1-1/2
13/4

x0
5H
OS
3=

2
2-1/4
2-1/2
23/4

9.3%)
10,6 |
11,2 |

11.8;

21.9|17.0|32.4|26.5|
23.3 | 18.1 | 39.8 | 27.9]
24.7 | 18.9) 41.7 | 29.3 |
26.1}
19.9] 43.9 | 30.8 |

aS
GO
4C

3
3-1/4
3-1/2
3-34

12.4 |
13.1 |
13.7 |
14.3 |

27.4
28.8
30.2
31.6

100
/0X
AE”

120

4
4-14
4-1/2
4-3/4

45.0
15.6
16.2
16,8

|
|
|
|

33.0)
34.3 |
35.7 |
37.1 |

2s
13 5-1/4
;ựo 5-1/2
lực S34

17.5
18.1
48.7

19.3

|
|
|
|

38.5 | 28.7 | 63.3 | 43.5 | 95.8|
39.9 | 29.7| 65.5 | 44.9 | 98.9)
41.2|30.7|
67.7|46.3|102
42.6 | 31.7; 69.8} 47.6 105

ISD

6
6-1/4
6-1/2
6-3/4

20.0 | 44.0 |
20.6 | 45.4 |
21,21 46.8)
21.8 | 48.1 |

32.6 | 71.9|49.0|108
33.6] 74.1) 50.3 J111
34.6) 76.3) 51.7/114
35.6 | 78.5 | 53.5 |118

7
7-14
7-1/2
7-3/4

22.5
23.1
23.7
24.3

|
|
|
|

49.5
50.9
52.3
53.6

|
|
|
|

36.6
37.6
38.5
39.5

|
|
|
|

80.6 | 54.9|121
|77.6|171
82.8|56.2|124
|79.4|174
84.9 | 57.6 [127 | 81.2/179
87.1 | $9.0 }130 | 83.0 /183

8
8-1/4
8-1/2
8-3/4
9

24.9 |
25.6 |
26.2 |
26.8 |
27.4 |

55.0
$6.4
57.8
59.1
60.5

|
|
|
|
|

40.5
41.5
42.4
43.4
44.4|

|
|
|
|

89.2 | 60.3 1133
91.4 | 61.7|136
93.5 | 63.1 ]139
95.7] 64.4 |142
97.8|65.8|145

NUT
Per inch
additional
add

For each
100 plain

round
washers
add

|
|
|
|

21.3)
47.0)
22.5 | 49.6}
23.7
52.2]
25.1 | 55.3|

1

lb

X
3B.
38
4€

745 | 16.5 | 13.3 29.4)
8.1]
17.8] 14.1] 31.1 |
8.7 | 19.2 115.0] 33.1 |
9.3 | 20.5 | 16.0|.35.3 |

zƑ

7/8kg

1-1/8
lb

kg

.

1-1/4
Ib

kg

1-3/8
Ib

kg

1-1/2
Ib

kg

Ib

—

_
33.7]
74.4]
35.4 | 78.0]
37.B4^81.9|

_
_
—
~
47.2;104
_
—
~
49.4109 | 67.1/148 | 89.4|197
51.7|114 | 69.9]154 | 93.0 205

_
_
—
_
|118.4)261

_
_
_
_
|151.0|333

39.1 | 86.1|

41.0}
90.3]
42.9]
94.6]
44.8;
98.8]

54.0l119
56.2/124
s9.0/130
61.2/135

20.9) 46.1 (32.2 | 70.9)
21.9} 48.2; 33.6]
74.0|
22.9 | 50.4 | 35.0 | 77.1]
23.8 | 52.5 | 36.44 80.2]

j122.5|270.
|126.6/279
j131.5|290.
|136.1/300

j156.0|344
|161.0/355
J166.0|366
|171.9]379

46.7|103
48.5107

50.3 [111
52.6|116

|
|
|
|

64.0]141
85.3|188
66.2|146 | 88.5]195
68.5]151
91.6202
71.2157 | 94.8|209

|111.6/246
(115.7 255
|119.3|263
{123.4 272

24.8]
25.8 |
26.8}
27.8 |

|140.6|310
|145.61321
|150.6|332
|155.11342

|177.4|391
|182.8/403
|188.7|416
|194.11428

54.4 ]120
56.2|124
58.1/128
60.3133

|
|
|
|

73.5]162 | 98.0/216
76.2/168
!101.2/223
78.5|173
|104.3/230
812|179
|107.5]237

1127.0
[131.1
|135.2
{138.8

280
289

298
306

|160.1|353
|164.71363
|169.6|374
|174.2/384

|200.0|441
|205.5{453
|210.9]465
|216.8|478

83.5]184
86.2|190
88.9|196
91.2|201

|110.7|244
|113.9]251
j117.0/258
|120.2|265

|142.9 315
|147.0|324
|150.61332
|154.7|341

|179.2|395
|183.7/405

188.7/416
193.2}426

|222.3|490
|228.2|503
J233.6|515
|239.0Ì527

69.9 |154 | 93.9;207
71.7]158 | 96.2|212
73.9/163 | 98.91218
75.8|167
|101.2|223

1123.3/272
|126.6/279
|129.7l286
|132.9|293

|158.3|349
|162.4/358
|166.5]367
|170.1/375

198.2|437
|202.8 447
[207.71458
|212.3Ì468

|244.9|540

|250,4;552
256.3|565
261.7|577

|103.9|229
|106.1|234
|108.9/240
|111.6|246

|136.1/300
|139.3|307
[142.4314
|145.6/321

|174.2|384
|177.81392
|181.9|401
|186.0/410

|217.3|479
|221.8|489
|226.8|500
[231.3/510

267:2|589
[273.1 602
278.5|614
284.0|626

HI3.9|251

|116.6/257
(118.8l262
{121.6]268
|123.8|273

|148.8|328
|452.01335
|155.1|342
|158.3|349
|161.5|356

|J1896l418
1193.7/427
|197.31435
|201.4/444
|205.5}453

|2363|521
j240.91531
|245.9|542
|250.4|552
|255.4|563

[289.9 639
2953651
[301.2 664
306.6 |676
1312.5 689

38.4|

61.6]
64.71
67.8]

94.7 | 37.8]
83.3]
56.9 | 39.2 | 86.4|
59.0} 40.6;
89.5]
61.2 | 42.0]
92.7]

|
|
|
|

|
|
|
|

62.1 |137 |
64.0 |141
|66.2|146 |
|68.0|150 |

|84.8|187
87.1 ]192
88.9196

90.2 |200
92.5 |204

| 72.6160 | 96.2 212.
| 75.8|167 | 99.8 220
| 78.9/174
|103.9 229
| 82.1181
{107.5 237

3.0 / 6.54]

5.4}

11.9/

8.8)

19.3;

13.5)

29.7]

19.3]

42.5]

25{

$5)

3.9}

86]

5.6}

1241

7.7)

16,9]

10.0]

22.1]

12.7]

1.7]

3.8)

24]

5.3}

3.6]

7.9)

5.2]

11.5]

65]

14.4)

24.9 | 10.8)

23.8]

10.3}

2261

9.5}

21.0}

8.7]

19.21

26.9 | 59.2]

35.7)

78.6]

46.31102.0|

59.4 131.0

28.0}

15.6)

34.4]

19.3]

42.5]

22.5

49.7

7.8]

17.21

9.4]

20.8)

123

27.1)

14.4;

31.8

15.4]

34.0]

14.3]

31.6]

—

—

-

~

r

For each
100 beveled

square

washers

add

41.3}


„ HIBN STRENGTH HEXAGON BOLTS
JIS B1186 ˆ

FO

a

ny

a

ne

ee

Pe HE HAT

$

UE

...j-

Syarikat Central Bolts & Nuts Sdn. Bhd.

171-175, JALAN SAN PENG, 55200 KUALA LUMPUR.
TEL. NO: 03-2218211 (4 LINES), 03-2217122 (4 LINES)
FAX NO: 03-2210724, 03-2210807

we

2

5

=


1. Scope
Japanese

Industrial Standard B 1186 specifies the sets of high strength
hexagon bolts, hexagon nuts and plain washers mainly used for friction _

grip joints of steel structures,

Misuboshi

Industries,

Ltd.

producing

these

strength

bolts branded

high

has rich
bolts

experiences of

over

25

since

the

high

1957

as NKYM

and

years

:

su

in

strength

¬

are enjoying ever increasing Teputation among
engineering and architectural people in building and bridge construction
industries.
The set shall be composed of one high strength hexagon bolt, one high

strength hexagon nut and two high strength plain washer. -

2. Classes and Grades
The Classes in combination with the grades according to mechanical
properties of the constituting parts shall be as given in Table 1.

Tabie 1
Nà
:
Classification of set
Class according to

Class 1

(Class 3)

torque coefficient
:

Class 2

Applicable grade according to mechanical
properties of constituting parts

Class according to

mechanical properties

A

Nut

F8T.

F10 (F8)

`

A

`
FI0T

B
:

Bolt.

B

A
B

(F11T)

Washer

~

hen

Remark: Those which are given in parentheses should not apply as far as possible.

*

F35
F10
lot

ca


CONTENTS
na...
2. Classes and Grades..................................

2

3. Material............
Q.22 122222
nho

3

4. Mechanical Properties th nh ng
4-1.

Com

ee

ee

4-1-1.

fT tat

2

4-1-2.
° 4-2.
4-3.

xxx

s.. 4

Mechanical Properties of Bolt......................
wi 4

Mechanical Properties of Test-Piece Machined
from Bolt ... 4
Mechanical Properties of Full Size Bolt................
4
Mechanical Properties of Nut...... Preece
eee eens 14
Hardness of Washer ©... 000... 00
e eee
5

9. Torque Coefficient of Set.............................

5

6. Shape and Dimensions...........................
6
6-1.
6-2.

6-3.

High Strength Hexagon Bolts for Friction Grip
Joints

High Strength Hexagon Nuts for Frict

ion Grip Joints

.....

6

.....

7

High Strength Plain Washers for Friction Grip Joints .....
. 7

7, Screw Threads.....................
. Reece
8. Marking

2...

ccc

9. Weights of a set of High Strength Bolt,

=

eee cevaae “28
cece.
¬

Nut and two Plain Washers..............

.......!+

8

9


3. Material
The material for bolts, Nuts

and Washers shall be such that the products

comply with the mechanical requirements of 4.
Mitsuboshi Industries, Ltd. uses several kinds of steel described in’
Table 2, which were specially produced by the high level controlled
furnace of Nippon Kokan K.K. and Nakayama Steel Works, Ltd. for
high strength bolts, nuts and washers.
These steels have a best heat-treatability and a good durability against
.
delayed fracture of the bolts.

'

Table 2,

Chemical requirements for high strength Bolts, Nuts and Washers

Classification
and
Grade

‘

Bolt

Designation | Marking

Low carbon
.

) ΤT or F10T) | martensite steel

HS22B0|

22

Low carbon }Hs20BH}

iD

s

Low carbon
Bolt
.
(F10T or F11T) | martensite steel

Medium

Nut

HS20BF|

(Œ10)

carbon steel

534C

Washer
(F35)

Medium
carbon steel

S45C

Remark:

Chemical composition (%) *
Cc

Si

0.20 | 0.10 | 0.80
025 | 030

~

|'1.10

|10.030|0.030|

0.18 | 0.10

~| ~| ~

| 0.70

|0030|0030|

0.18 | 0.10 | 0.70
~
~
~
0.22 | 030 | 0.90

|0.020|0.030|

~

~

0.22 | 0.30 | 0.90

0.30 | 0.15 | 0.60
`

`

~

0.36 | 0.35 | 0.90
0.42

0.15

Cr

Mn | Pmax[|Smax|

0.60

| 0,030

0.035)

0030
7

0.035;
.

-

0.48 | 0.35 | 0.90 |,

|Cumax|Nimax}

0.25

~ | °|:0.20 | 0.20
0.45

B min
[0.0005

9.60

~ | 0.20 | 0.20 [0.0005

0.80

0.90
~ |
1.10

,

0.20 | 0.20

|0.0005

—

~

7

7

—

_

_

_

Selection of steel for high strength bolts depends upon the grade and size of bolt produced.


4. Mechanical Properties
4-1, Mechanical Properties of Bolt

be
per

4-1-1. Mechanical properties of Test Piece Machined from Bolt

A

Table 3

i

according
Grademechanical

Proof stress

kgflmm2

strength
Tensile
kgf/mm?

properties of bolt

(N/mm?)*

(N/mm?)*

64 min.

(627.6 min.)

(784.5 to 980.7)

(882.6 min.)

to

i
|

F8T

80toi00

95 min.

.

*

.

5

16 min.

45 min.

(980.7 to 1176.8)

14 min,

40 min.

110 to 130

14 min,

;

;

(931.6 min.) "| (1078.7 to 1274.9)

FUT

:

Reduction of area

°

100 to 120

90 min.

F10T

:

Elongation

:

.

40 min.

Note* 1N/mm? = 1 MPa
i

soe

The impact value is tested when required by customer.

“es

s

+

Mechanical Properties of Full-Size Bolt

/ 41-2,

—.-

Table 4

,

Grade according

Designation of screw threads

Hardness

FST

(66.1) | 123.6) | (492.2) | (237.3) | (276.6) | 4599) | 440.3)

to 31
HRCI18

F10T

(82.67) | (154.0) | (240.3) | (297.1) | 46.2) | 450.1) | (550.2)

HRC27 to 38

to mechanical

properties ofbolt [ MỊ2 | M16 | M20 | M22.|
6740 | 12600 | 19600 | 24200'|
RIT

Remark:
|

Tensile load (min.) (kgf) (KN)

M24 | M27 | M30
28200 | 36700 | 44900

8430 | 15700 | 24500 | 30300 | 35300 | 45900 | 56100

9270 | 17300 | 27000 | 33300 | 38800-|

:

50500 | 61700 | mc3o:o40

(90.91) | (169.7) | (264.8) | (326.5) | (380.5) | (495.3) | (605.1)

subject to

For the bolt which has been subjected to the tension test, the hardness test may be omitted,
the customer’s requirement.


4-2. Mechanical Properties of Nut
Table 5
Grade according to
mechanical properties of
nut

Hardness
Min,

Max.

F 8

HR B85

HRB100

F10

HR B9S

HRC

Guaranteed load

Same as the tensile load

(min.) of bolt specified
in Table 4,

35

4-3. Hardness of Washer
Table 6
Grade according to mechanical properties
of washer

F3

ae

HRC35 to 45

+

»

Hardness

5. Torque Coefficient of Set
Table 7

;
Class of set according to torque coefficient

Division

A’

Mean of torque coefficient values of one
manufacturing lot (2)

.

0.110 to 0.150
:

Standard deviation of torque coefficient values of

one manufacturing lot (2)

.

.

B

>

` 0.150 to 0.190
.

0.010 niax.

:

0.013 max.

The torque coefficient shall be obtained from the following formula:
where
K=

T
axNn

x 1000

K:

"

torque coefficient

T

an
torque (moment tofasten nut) (ket: -m) (N-m)

d:

basic thread outside diameter of bolt (mm)

N: axial force of bolt (1) (kgf) (N)

os

- Notes:~ (1) The axial force mentioned above means a tensile force to act in axial direction of the bolt caused by

(2)

a torque to fasten the bolt.
The one manufacturing lot mentioned above means the lot of set which the bolt, nut and washers of
each identical lot constitute.
.


6. Shape and Dimensions
6-1, High Strength Hexagon Bolts for Friction Grip Joints
Eccentricity

Inclination of

of head

Inclination

bearing face

of side face
F,

`)
Designation!

threads(d)

Basi

dị

asic

:
Basi

‘es

| M20 | 20
+'|

M22 | 22

8
10

M30 | 30

14

]e

Tp

ˆ

TP,

K

Cc

r

40.9

Loz]
27

o [254]
~0.8
312]

20 | 20)

RS

37 | 30 | 29 | L2t9

36

41.6 | 34 | 33

4i | D70

,

08

138v

46

s31|

44}

43]

19 | +10 | 50

517]

48

|41|2940|

J

3$

Basic

dimen. Toler.

3 | 46
0
30

-

35

afr | 2

¬=

24

kh

09

Olas

39

8

9

25 | 25

32

Unit: mm

|ab|E|F

Approx.| Max. | Max. Max

0.8 to

1472|

Basic dimension

[Odi
,

40

4s | +6l6

13

30

|1

55

.!

30] 35] 40 | 45] 50] 55] 60} 65| 70] 75] 80| 85] 90] 95 l1ool105]11011151120

Tolerance on /

+1.0

.

`

+14

I

Baicdimemion
Tolerance on]

oa
+0,

13

M24 | 24 | +0.8
8# | ts
M27 | 27
17

Remark:

B-

dimen- Toler- dimen- Toler simen- Toler- Approx.|Approx.| Min.

|12 | oy]
mis | 16 -Ì~0.2

re

Basi

asic

M2
a

H

-

[125]130[135)149]145[150|155[160[165]1 70]175]180]190]200)210|220
+18
‡

The screw end may be either of flat point or of oval point.

ro
.

s*

a

Table 8

6-2. High Strength Hexagon Nuts for Fric
tion Grip Joints
Eccentricity
of boit hole

50s

s

2,

II,

Ñ
TW

-—

oya

Ẳ

50S

4 |

%

30°

|

af,

H

~f

Td

Inclination
of side face

b

op

œ

Inclination of
bearing face

LLz

Table 9

Unit: mm

Designation | Outside
of screw | diameter of

threads
(d)

> ve

H

7

external
, Basic
threads | dimens
ion

B

Cc

D

Approx.

Approx.|

25.4

20

20 [

0.7

31.2

25

25 |

0.8

32

37

30

2

36

0.9

416 |

34 | 33)

11]

47.3

39

38

1.2

7
Tolerance

, Basic
dimension,

Tolerance|

D, |

ab

12

12

M16

16

16

M20

20

20

M22

22

22

M24

24

24

M27

27

27

46

53.1

44

43

13

M30

30

30

30

317

48

47

LS

Remark:

22

bs

27

+0.4

`

41

+

F

h

Min. | Max. | Max, | Max.

M12

£0.35

#

a,

a | 2° | 420
.

Chamfering of the threaded portion of nut bearin
g face side shall be of 1.0 to 1.05 din diameter.

6-3. High Strength Plain Washers for Friction
Grip Joints.

Table 10

d

Designation
of

+
Remark:

f

washer

Unit: mm

s

din

12

13

16

17

20

21

22

23

24

25

27

28

30

31

on

tae

Tolerance . di Basic’

b

corr
Tolerance

=-

32

7“

40

0

40.8

* 44

-1

o

yr 4g

119
QO

>

‡

56

0

60

~

12

5

ie

0

26

18.7

>+

3.2

+0.4

4.5 i

30,5

a

7

“|

Tolerance |

.

6
`
8

+0.7

Approx.

15
`

2

24

an

2.8

The above figures show a plain washer with 45°
chamfer and that with radius r, and either chamf
er or
tadius to be used is optional.
+

,

-


7. Screw Threads
screw threads of the bolts and nuts shall be metric coarse screw
6 H/6 g
threads specified in JIS B 0205, and their grade shall be of

The

‘

specified in JIS B 0209.

The screw threads of the bolts shall have been made by thread rolling.

8. Marking
All bolts shall be marked with notation (F8T, F10T
class

ing the

to mechanical properties

tion mark of manufactuer on the
All nuts shall be marked on one
circumferential lines according
In case of Mitsuboshi Industries,

of bolt and identifica-

top of the bold head.
face with two or three equally spaced
to mechanical properties of the nut.
Ltd., the markings are as described in

',

:

.

„„.Table 11.
Table 11

Bolt

ị

F10

F8

Nut

Nut

2

a

Ye

N

F10T

ZZ

4

according

or F11T) designat-

|


_ 9, Weights of a set of Hig h Strength Bolt, Nut-. and two Plain Washers
›

Fe

coer

a

(Approximate weight of 100 sets of bolts, nuts and washers)
Unit: kes and pounds

length

diameter

30
35
: 40
45
50
55
` 60
65
70
75
80
. 85
.
90
,
95
100
“105
7-1109
115
120
125
130
135
. 140
» 145

150
155
160
165
170
175.
180
190
200
210
220
Remark:

M12
kg | Ib |
9.8 | 21.6
10.3 | 22.7
10.7 | 23.6 |
11.2 | 24.7 |
11.6 | 25.6 |
12.1 | 26.7 |
12.5 | 27.6 |
13.0 | 28.7

.

M16
kø | Ib |
20.2 |
21.0

21.7 |
22.5 |
23.3 |
|.24.1 |
24.9: |
25.7 |
26.5 |
27.3 |
28.1 |
28.9 |
29.6 |

44.5
|46.3
47.8
49.6
51.4
53.1
54.9
56.7
58.4
60.2
61.9
63.7
65.3

-

M20

kg |

| 34.8 |
| 36.1,)
| 37.3 |
|38.5 |
| 39.8 |
| 41.0 |
| 42.2 |
| 43.5 |
| 44.7 |
| 45.9 |
| 47.2
| 48.4
49.6 |
50.9
52.1 |
53.3 |
:

Ib |

M22

kg |

Ib |

76.7
79.6|.49.6 |109.3

82.2] 51.0 |112.4
84.9] 52.5 |115.7]
87.7] 54.0:}119.0]
90.4} 55.5 |122.4|
93.0] 57.0 |125.7|
95.9} 58.5 |129.0|
98.5] 60.0 [132.3]
101.2] 61.5 | 135.6]
|104.1| 63.0 | 138.9]
|106.7| 64.5 | 142.2|
109.3] 65.9 }145.3]
|112.2| 67.4 |148.6|
114.9} 68.9 [151.9]
117.5} 70.4 [155.2]
71.9 |158.5|
73.4 |161.8|
74.9 1165.1}
76.4 |168.4|
779 |171.7|
79.4 175,0 |
80.8 | 178.1 |
82.3 | 181.4]
~
~

M24

ke ]

M27

kg | b |

Ib |

68.3 |150.6
70.1 | 154.5
71.9] 158.5]
73.7 | 162.5 |
75.4] 166.2 |
77.2] 170.2 |
79.0] 174.2 |
80.8] 178.1
82.5] 181.9 |
84:3] 185.8 |
86.1 | 189.8 |
87.9 | 193.8 |
89.6 | 197.5 |
91.4|201.5
93.2|205.5
95.0| 209.4 |
96.7 | 213.2 |
98.5 | 217.2 |
100.3 | 221.1 |
102.1 | 225.1 |
103.8 | 228.8 |
1105.6 | 232.8 |
107.4 | 236.8 |
{109.2 | 240.7 |
110.9 | 244.5 |

:

2
°

M30
kg | b

oye
99.9 }220.2| 131.9 | 290.8
10%3.| 225.3 | 134.7 | 297.0
104.5 {230.4 | 137.5 | 303.1
106.8 [235.5 | 140.3 | 309.3
109.1 {240.5 | 143.1 | 315.5
[111.4 [245.6 | 145.9 | 321.7
113.7 [250.7 | 148.7 | 327.8
116.0 |255.7} 151.5 | 334.0
118.3 | 260.8 | 154.3 | 340.2
120.6 | 265.9 [157.1 | 346.3
122.9 | 270.9 | 159.9 | 352.5
|125.2 |276.0 | 162.7 | 358.7
]127.5 |281.1 |165.5 | 364.9
129.8 | 286.2 | 168.3 |371.0
132.1 |291.2| 171.1 | 377.2
134.4 | 296.3 | 173.9 | 383 4
136.7 |301.4 | 176.7 | 389.6
139.0 [306.4
| 179.5 | 395.7
141.3 |311.5 | 182.3 | 401.9
143.6 1316.6 | 185.1 | 408.1

145.9 {321.7 | 187.9 | 414.2
148.2 {326.7 | 190.7 | 420.4
150.5 | 331.8 | 193.5 | 426.6
153.1 }341.9 1199.1 | 438.9
[159.7 1352.1 | 204.7 | 4513
|
, | 210.3 | 463.6
215.9 | 476.0

The dimensions of which weights are given in the table indicate the recommended lengths.


.

GH STRENGTH

FRICTION GRIP
EXAGON BOLTS
‘Aaterials and Dimensions to BS 4395 Part 1.

Threaded Form in accordance with BS 3643 coarse pitch series

medium class fit 6g. Bolts are identified as High Strength by 3
|edial lines 120° apart embossed on the head of the bolt.
Hexagon nuts to BS 4395 refer to page 4.

-

fd

RadR,

Dimensions in millimetres

__

i

B
Diameter of
unthreaded

D
Đìcnunal

shank

i=

max
12:70
16-70
20-81
22-84
24-84
27-84
39-61
34-01
37-0

i

|
|
|
|
|
|
|
|

min
11:39
15-30
18115
21-16
23-16
26-16
29-16
32-0
35-0

max}
22
27
32
35)
41
48
50

55
60

|
|
|
|
|
|
|
|

min
21:16
25-16
31-00
35:00
40.00
45-00
49-09
53-60
58-20

Length of thread table BS 4395
Unto and including 125mm

'
Ị

Over 125mm

Over 200mm

mịn
max
25-4 | 23-79
31-2 | 29-30
36-9 | 35-03
41-6 | 39-55
47⁄3 | 45:20
50-85
531
57-7 | 85-37
63-5 | 60-78
69-3 | 66-44

Part 1.

. Length of thread

Nominal iength cf belt

i

i

c
Width
across corners

A
Width
across flats

up te and ineluding 200mm

|

max
22
27
32
36
41
46
50
55
60

|
|
|
|
|
|
|
|
|
|

H
Radius under
head

K
Denth
of

E
Diameter of
washer face

washer
face

min
19-91
24-91
29-75
33-75
3875
43-75
47-75
52-55
57-75

max |
1:00;
1001
1⁄2

1⁄2
1:2
1-5
1-8
1‹8
15

max
9-4
9-4
0á
04
0-5
0-5
95
05
05

max
8-45
10-45
13-80
14:90
16-90
17-80
20:05
2205
24:05

|

|
|
|
|
|
|

of

min
7:85
9-E5
12:10
13:10
14.19
16-10
17-95
19:95
21-85

-

Length of thread table BS 4395 Part 2.
Nominal length of bolt

2D : 6mm

Upto and including 125mm

20-12mm

Over 125m

2D ‹ 25mm

mia
06
055
Q8
90-8
1-0
1:0
10
1-0

`

F
Thickness
head

Over 200mrn

Up to and ïncluding 290mm

ar

High strength friction grip bolts to BS 4395

Part 2

Relates to the higher grade 10-9 for the sizes M16 to M33 inclusive.
108.
Bolts are identified as higher grade strength friction grip bolts by the marking

Lenath of thread
:12n1m
1mm

22mm

1

: