Portland Bolt Expands with Acquisition of Bennett Bolt Works
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A668 Mechanical Requirements

Class Size, inches Tensile, min ksi Yield, min ksi Elong, % min in 2” RA, % min Hardness, HBN
A Up to 20 47 - - - 183 max
B Up to 20 60 30 24 36 120-174
C Up to 12 66 33 23 36 137-183
12 to 20 66 33 22 34 137-183
D Up to 8 75 37.5 24 40 149-207
8 to 12 75 37.5 22 35 149-207
12 to 20 75 37.5 20 19 149-207
Over 20 75 37.5 19 30 149-207
E Up to 8 85 44 25 40 174-217
8 to 12 85 44 23 37 174-217
12 to 20 83 43 22 35 174-217
F Up to 4 90 55 20 39 187-235
4 to 7 85 50 20 39 174-217
7 to 10 85 50 19 37 174-217
10 to 20 82 48 19 36 174-217
G Up to 12 80 50 24 40 163-207
12 to 20 80 50 22 38 163-207
H Up to 7 90 60 22 44 187-235
7 to 10 90 58 21 42 187-235
10 to 20 90 58 18 40 187-235
J Up to 7 95 70 20 50 197-255
7 to 10 90 65 20 50 187-235
10 to 20 90 65 18 48 207-255
K Up to 7 105 80 20 50 212-269
7 to 10 100 75 19 50 207-269
10 to 20 100 75 18 48 207-269
L Up to 4 125 105 16 50 255-321
4 to 7 115 95 16 45 235-302
7 to 10 110 85 16 45 223-293
10 to 20 110 85 14 40 223-293
M Up to 4 145 120 15 45 293-352
4 to 7 140 115 14 40 285-341
7 to 10 135 110 13 40 269-331
10 to 20 135 110 12 38 269-341
N Up to 4 170 140 13 40 331-401
4 to 7 165 135 12 35 331-401
7 to 10 160 130 11 35 321-388
10 to 20 160 130 11 35 321-402
Classes with an added ‘H’ are supplied on the basis of hardness values only. For example, AH. Classes A-F are carbon steel, classes G-N are alloy steel
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