SA307

Carbon steel bolts and studs, 60,000 psi tensile strength.

SA307

Carbon Steel Bolts and studs, 60000 PSI Tensle Strength

Table 1 Chemical Requirements for Grades A and B Bolts and Studs

Studs    
Elements Heat Analysis Product Analysis
Carbon 0.29 0.33
Manganese 1.20 1.25
Phosporous, Max 0.04 0.041
Sulfur, Max    
Grade A 0.15  
Grade B 0.05 0.051

 

Table 2 Hardness Requirements for Bolts and Studs

Grade

Length, in.

Hardness
Brinell Rockwell B
Min Max Min Max

A

Less than 3x dia 121 241 69 100
3x dia and longer 241 100

B

Less than 3x dia 121 212 69 95
3x dia and longer 212 95

 

Table 3 Tensile Requirements for Full-Size Bolts and Studs

Bolt Size, in.

Threads Per inch

Stress Area , in

Tensile Strength,lbf (1lbf=4.448N)
Grade A Grade B
  Min Max
1/4 20 0.0318 1 900 1 900 3 180
5/16 18 0.0524 3 100 3 100 5 240
3/8 16 0.0775 4 650 4 650 7 750
7/16 14 0.1063 6 350 6 350 10 630
1/2 13 0.1419 8 500 8 500 14 190
9/16 12 0.182 11 000 11 000 18 200
5/8 11 0.226 13 550 13 550 22 600
3/4 10 0.334 20 050 20 050 33 400
7/8 9 0.462 27 700 27 700 46 200
1 8 0.606 36 350 36 350 60 600
1 1/8 7 0.763 45 800 45 800 76 300
1 1/4 7 0.969 58 150 58 150 96 900
1 3/8 6 1.155 69 300 69 300 115 500
1 1/2 6 1.405 84 300 84 300 140 500
1 3/4 5 1.9 114 000 114 000 190 000
2 4 1/2 2.5 150 000 150 000 250 000
2 1/4 4 1/2 3.25 195 000 195 000 325 000
2 1/2 4 4 240 000 240 000 400 000
2 3/4 4 4.93 295 800 295 800 493 000
3 4 5.97 358 200 358 200 597 000
3 1/4 4 7.1 426 000 426 000 710 000
3 1/2 4 8.33 499 800 499 800 833 000
3 3/4 4 9.66 579 600 579 600 966 000
4 4 11.08 664 800 664 800 1 108 000

 

Table 4 Tensile Requirements for Machined Specimens

  Tensile Strength,ksi Yield Point Min Ksi Elongaton in 2 inch, Min%
Grade A 60 min 18
Grade B 60-100 18

 

Table 5 Product Marking

Grade Marking
A 307A
B 307B

 

A307 Recommended Hardware

Nuts

Washers

A307 Grades A & C* A307 Grade B
1/4 - 1-1/2 1-5/8 - 4 38078
A563A Hex A563A Heavy Hex A563A Heavy Hex F844