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Wind Tower Bolts
 

 

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Mechanical Requirements for Bolts
 
Grade Designation  		 Nominal Size of Product in.    
Material and Treatment  		 Mechanical Requirements  

Grade Identification Marking  
Proof Load Stress ksi Yield Strength ksi Min Tensile Strength ksi Min Product, Hardness, Rockwell
Surface Max Core
Min Max
A307 Gr. A
 1/4 to 4
low or medium carbon steel  
 - - 60 - B69 B100
307A
A307 Gr. B
 1/4 to 4 -
-		 -
-		 60 min 100 max -  B69 B95  307B 
SAE Gr. 1
   1/4 to 1/2
33 36 60 - B70 B100 None
Specified
  SAE Gr. 2   1/4 to 3/4 low or medium carbon steel, cold worked   55   57   74   -   B80   B100 None
Specified
SAE Gr. 5  ¼ to 1 11/8 to
1½
medium carbon steel the product quenched
and
tempered
85
74
82
81
120
105
30N54
30N50
C25
C19
C34 C30
 A449 Type Type 1 ¼ to 1 11/8 to 1-¾to 3 85
74
55		 92
81
58		 120
105
90		 -
-
-		 C25
C19
B91		 C34 C30 B100
A325
Type 2		 ½ to 1 1-1/8 to 1-1/2 85
74		 92
81

120
105

 -
-		 C24
C19		 C35
C31		 A325 
SAE Gr. 5.2 1/4 to 1 low carbon boron steel; the product is quenched and tempered

 85 92 120 30N56 C26 C36    
A449
Type 2		 1/4 to 1  85  92  120  -  C25 C34 
  A325
Type 3  		½ to 1 atmospheric corrosion resistant steel; the product is  quenched and tempered
   85   92   120   -   C24   C35     A325   
    1-1/8 to 1-½   74   81   105     -   C19   C31
SAE Gr. 8 1/4 to 1-1/2 medium carbon alloy steel: the product is quenched and tempered  120 130 150 30N58.6 C33 C39
  A354 Gr. BD  1/4 to
2-1/2  		120  130  150 - C33  C39    BD 
2-3/4 to 4 105 115 140 - C31 C38
A490 Type 1 ½ to
1-1½ 		 120  130  150 min 170 max -
-		 C33  C38  A490 
  SAE Gr. 8.2   1/4 to 1 low carbon boron steel; the product is quenched and tempered   120   130   150   30N58.6   C33   C39
  A490  Type 3     1/2 to 1-1/2  atmospheric corrosion resistant steel: the product is quenched and tempered   120    130    150 min  170 max   -    C33 
C38  		  A490 
See Notes 1, 4     2 2 2     3.5
  NOTES:                        
1. For titles and sources of availability for referenced ASTM and SAE standards, refer to page N-38. For ASTM A307, see page B90. For ASTM A449, see page B-97. For ASTM A325, see page E-28. For ASTM A354, see page B-139. For ASTM A490, see page E-37. For SAE J429, see page B-79.  
2. To compute the proof load, yield strength or tensile strength, in pounds, for a bolt, screw or stud, multiply the stress value, ksi, as given in Table 2 for the strength grade by 1000 and multiply this answer by the tensile stress area of the product's screw thread as given in Tables 1, 2 and 3 of ASME 131.1, pages A-36 thru A-38.  
3. In general, identification markings shall be located on the top of the product head and preferably shall be raised.
4. SAE Grade 2 products are available in lengths 6 in. and shorter only.      
5. Six radial lines as for SAE Grade 8 are optional in addition to the mandatory BD mark for ASTM A354.        
 

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