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

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

171-175, JALAN SAN PENG, 55200 KUALA LUMPUR =D AANA

TEL: 03-2218211 {6 LINES), 03-2217122 (6 LINES) FAX NO: 03-2210724, 03-2210807

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 beeen cence eee eens 4 Mechanical Requirements

4-] 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 -

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 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 described in Table 1

They are quenched in oil or in a suitable liquid and then tempered

Threads of all bolts are rolled

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 - Nut grade and finish Washer

land 2, Plain A563, C, Plain F436 carbon

A325 1 and 2, Galvani and 2, Galvanized A 563, DH or A194, 2H, Galvani , DH or A194, , Galvanized steel for Type 1&2

bolts and

1 and 2, Plain A563, DH or A194, 2H, Plain weathering

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 Type 1 830~ 880 OQ 530~ 600 WC A490 Type 2 850~900 WQ 380~450 WC A490 Type 3 860~900 WQ 480 ~ 530 WC

3 Chemical Requirements * “

Bolts, nuts and washers conform to the requirements of chemical composition described

in Table 2 to 5

3-1 Chemical requirements for A325 bolts

Table 2 Chemical requirements for A325 bolts

Bolt type Chemical composition (%) : _ _

c Mn |} P max|S max Si Cu Ni Cr {| Vmin | Bmin

12) martensite stee!|~0.23 | min [004] 905] - | - | - | - | - |-0005

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

Note: 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

Bolt type Cc Mn ]P max Saat te |r| mm orMo |B min

| T2 | marsaste deel| ~634| min [004|005J = | - | - | - |.0005

ĐEN IEaPiriEiEiEiEriF

Note: 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 Chemical composition (%)

UE Brace Cc Mn | Pmax | S max _ Si —— Cu Ni Cr ụ A563 € - 0.55 max - 0612 | 01 - - - - -

3-4 Chemical requirements for Washers

Table 5 Chemical requirements for washers

Chemical composition (%)

P max S max Si Cr Ni Cu F436 Carbon steel 0.040 0.050 — _ _ = F436 Weathering steel 0.040 0.050 |0.15~ 0.30] 0.45 ~ 0.65] 0.25 ~ 0.45| 0.25 ~ 0.45

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

4 Mechanical Requirements

4-1 Mechanical properties of bolts:

4-1-1 Tensile requirements for Full-Size Bolts Table 6 Tensile requirements for Full Size Bolts : |

Load”, min, lbf 1 ee

Bolt Size, Tensile Strength”, Ibf Proof LoadP, Ibf

Threads per | Stress

Inch and Area; Min, Max Length Measure- Yield Strength |

A325 A490 A525 A490 A325 A490 A325 A490 - 4 Column 1 C2 C3 C-4 C5 C-6 C7 C-8 C9 C-10 , %-13UNC | 0.142 | 17,050] 21,300 - 24,150} 12,050| 17,050) 13,050] 18,500

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 | 175,050 120,850 194,000

a) The stress area is calculated as follows:

As = 0.7854 [D — (0.9743/n)]?

where: As =stress area, in? ~ ]

-* n = threads per inch

b) Loads tabulated are based on the following

⁄ 1⁄2 to 1inel | 120,000 psi 85,000 psi " 92,000 psi

150,000 psi | 170,000 psi 120,000 psi ———-— 130,000 psi

11⁄4 to 11⁄2 | 105,000 psi 74, 000 psi 81,000 psi| |

ị

Table 8 Hardness requirements for Bolts

Grade and bolt Hardness Number

| 4-2 Mechanical properties of nuts i

Table 9 Proof load and Hardness requirements for Nuts |

Grade Nominal nut Proof load stress, ksi Hardness

Nut in vanized Galvanized

nuts 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

en

_ 5, Dimensions and Markings

5-1 Dimensions of bolts, nuts, and washers

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 1/2 5/8 3/4 tol 1-1/8 to 1-1/2

Nom bolt length 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

Table 11 Dimensions of bolts, nuts and washers unit: inch

1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 max | 0.515 0.642 0.768 0.895 1.022 1.149 1.277 1.404 1.531

® min 0.482 0.605 0.729 0.852 0.976 1.098 1.223 1.345 -| 1.470 max | 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 Bott max | 0.323 0.403 0.480 - 0.563 0.627 0.718 0.813 0.878 0.974

H 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 Lt] basic | 1.00 1.25 1.38 1.507 1.75 2.00 2.00 2.25 2.25

Y | max | 0.19 0.22 0.25 0.28 0.31 0.34 0.38 0,44 9.44 max | 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 Nat ° 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

" 6 Weights of ASTM A325 and A490 heavy hex structural

bolts with heavy hex nuts

(Approximate weight of 100 steel bolts and nuts)

„ HIBN STRENGTH HEXAGON BOLTS

JIS B1186 ˆ

FO a ny a ne ee .j $ - we 2 5 =

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

1 Scope

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

grip joints of steel structures, :

Misuboshi Industries, Ltd has rich experiences of over 25 years in

producing these high strength bolts since 1957 and the high strength ¬ ca

bolts branded as NKYM 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

mechanical properties torque coefficient Bolt Nut Washer

CONTENTS

na 2

2 Classes and Grades 2

3 Material Q.22 122222 nho 3 4 Mechanical Properties th nh ng xxx s 4

4-1 Mechanical Properties of Bolt wi 4 4-1-1 Mechanical Properties of Test-Piece Machined from Bolt 4

4-1-2 Mechanical Properties of Full Size Bolt 4

° 4-2 Mechanical Properties of Nut Preece eee eens 14 4-3 Hardness of Washer © 000 00 e eee 5 9 Torque Coefficient of Set 5

6 Shape and Dimensions 6

6-1 High Strength Hexagon Bolts for Friction Grip Joints 6

6-2 High Strength Hexagon Nuts for Friction Grip Joints 7

6-3 High Strength Plain Washers for Friction Grip Joints 7

7, Screw Threads Reece eee cevaae “28 8 Marking 2 ccc cece 8 9 Weights of a set of High Strength Bolt, = ¬ Nut and two Plain Washers ! + 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 Chemical composition (%) *

and Designation | Marking Grade Cc Si Mn | Pmax[|Smax| Cr |Cumax|Nimax} B min

Nut Medium 0.30 | 0.15 | 0.60 ,

(Œ10) carbon steel 534C ` ` ~ | 0,030 0.035) — ~ 7 7

0.36 | 0.35 | 0.90 - Washer Medium S45C 0.42 0.15 0.60 0030 0.035; — _ _ _ (F35) carbon steel 0.48 | 0.35 | 0.90 |, 7

4 Mechanical Properties

be 4-1, Mechanical Properties of Bolt

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

per

Table 3

i

A Grade according Proof stress Tensile strength : :

to mechanical kgflmm2 kgf/mm? Elongation Reduction of area

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

to mechanical Designation of screw threads Hardness properties ofbolt [ MỊ2 | M16 | M20 | M22.| M24 | M27 | M30

6740 | 12600 | 19600 | 24200'| 28200 | 36700 | 44900 :

FST (66.1) | 123.6) | (492.2) | (237.3) | (276.6) | 4599) | 440.3) HRCI18 to 31

—.-

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

, F10T (82.67) | (154.0) | (240.3) | (297.1) | 46.2) | 450.1) | (550.2) HRC27 to 38

RIT 9270 | 17300 | 27000 | 33300 | 38800-| 50500 | 61700 | mc3o:o40

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

Remark: For the bolt which has been subjected to the tension test, the hardness test may be omitted, subject to

| the customer’s requirement.

Grade according to Hardness

mechanical properties of Guaranteed load

nut Min, Max

F 8 HR B85 HRB100 Same as the tensile load

(min.) of bolt specified F10 HR B9S HRC 35 in Table 4,

Standard deviation of torque coefficient values of 0.010 niax 0.013 max

one manufacturing lot (2) :

K= axNn x 1000 T torque (moment to fasten nut) (ket: -m) (N-m)

d: basic thread outside diameter of bolt (mm) os

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

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

a torque to fasten the bolt

(2) The one manufacturing lot mentioned above means the lot of set which the bolt, nut and washers of each identical lot constitute

‘es

6 Shape and Dimensions

6-1, High Strength Hexagon Bolts for Friction Grip Joints

Eccentricity Inclination of Inclination

of head bearing face of side face

Remark: Chamfering of the threaded portion of nut bearing face side shall be of 1.0 to 1.05 din diameter

6-3 High Strength Plain Washers for Friction Grip Joints

Remark: The above figures show a plain washer with 45°

tadius to be used is optional

, +

chamfer and that with radius r, and either chamfer or