... 1.6 2,200 5/16" 8 2.5 3,400 3/8 " 9 3.6 4,900 7/16" 11 4.9 ... 6,600 1/2 " 12 6.3 8,500 9/16" 14 8.0 10,800 5 ... /8 " 16 10.0 3/4 " 18 14.3 19,400 13/16" 18 16.5 24,400 ... ,000 1- 5/8 " 40 71.0 90,000 1- 3/4 " 42 42 85.0 106,000 2 " 48 102 ... 181.0 213,000 2- 3/4 " 66 204.0 237,000 3 " 72 228.0 261,000 3- 1/4 " 80 282.0 ...