Bu Lông Tiêu Chuẩn ASTM

Bu Lông Tiêu Chuẩn ASTM

Bu Lông Tiêu Chuẩn ASTM

[ AREAS-494 ]

Applications


Heavy hex bolts can be used for many different applications that include fastening wood, steel, and other construction materials for projects such as docks, bridges, highway structures, and buildings. Heavy hex bolts with forged heads are also commonly used as headed anchor bolts.

  • A307

  • F1554

  • A325 

  • A490 

  • A193 

  • A320

Several ASTM specifications require a hex head that is larger than a standard (finished) hex head. These specifications include: A193, A320 and A307B. Although A325 and A490 bolts also require a heavy hex head, please refer to Structural Bolts for dimensional specifications, since these bolts have shorter thread lengths than standard heavy hex bolts.

Structural Bolts ASTM A325M

Metric Series -  Physical Properties

Physical Properties


Type '1'

Type '1'

              Nominal Thread Size

M12 to M24

M25 <36

Tensile Strength (Min.)(N/mm2)830830
Yield Strength (Min.)(N/mm2)660660
Proof Load Stress (Min.)(N/mm2)600600
On GL = 2" Elongation (Min.)[%]1212
Reduction of Area (Min.)[%]3535
Hardness[HR]Bolt length <2D C25-C34Bolt length <3D C19-C30
Bolt length 2D and over C34 (Max.)Bolt length 3D and over C30 (Max.)

Rotational Capacity Test for Zinc Coated Bolts

Bolt length in

Nominal Nut rotation degree (Turn)

2D and Shorter180 (1/2)
Over 2D to 3D Incl.240 (2/3)
Over 3D to 4D Incl.300 (7/8)
Over 4D to 8D Incl.360 (1)
Over 8D420 (1-1/8)

Recommended Tightening Torques and Induced Loads

Thread Size and Pitch

Stress Area

Un-lubricated Finish

Induced Load

MM2

Nm

KN

M12-1.7584.3093.4738.9
M16-2.00157232-1172.534
M20-2.50245452.76112.19
M22-2.50303615.94139.99
M24-3.00353782.81163.09
M27-3.004591,145.11212.06
M30-3.505611,555.10259.18
M36-4.008172,717.67377.45

    Metric Series - Dimensions:

     Note:

  •         The Bolts will generally conform to ANSI/ASME B 18.2.3.7M Metric Heavy Hex Structural Bolts.

  •         Thread will conform to Class 6g of ANSI B1.13M Coarse Series.

  •         Material: High Grade Carbon/Alloy Steel.

  •         Heat Treatment as per ASTM A 325M or ASTM F 568M Class 8.8.

  •         Thread length LT

                LT1 for L<100

                LT2 for L>100

            All Dimensions are in millimeter

Nominal Thread Size

Pitch

F Max.

G Max.

B Max.

H Max.

R Max.

Length of Thread

Length Range

LT1

LT2

M12

1.7522.0025.4012.708.00.625--30-200

M16

2.0027.0031.1816.7010.00.6313850-200

M20

2.5034.0039.1820.8412.50.8364350-200

M22

2.5036.0041.5722.8414.00.8384570-200

M24

3..0041.0047.3424.8415.01.0414870-200

M27

3.0046.0051.1227.8417.01.2445180-200

M30

3.5050.00577430.8418.71.24956100-200

M36

4.0060.0069.2837.8422.51.55663100-200

 

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