Weight per Resistance in lbs. per
Kind. cubic foot square inch. Value of s.
in pounds. Extension Compression.
White Pine. 26 12,000 6000 1229
Yellow Pine. 31 12,000 6000 1185
Pitch Pine. 46 12,000 6000 1727
Red Pine. 35 12,000 6000 1527
Virginia Pine. 37 12,000 6000 1456
Spruce. 48 12,000 6000 1036
Tamarack. 26 12,000 6000 907
Canada Balsam. 34 12,000 6000 1123
White Oak. 48 15,000 7500 1743
Red Oak. 41 15,000 7600 1687
Birch. 44 15,000 7000 1928
Ash. 38 16,000 8100 1795
Hickory. 51 15,000 7200 2129
Elm. 45 16,000 8011 1970
The above table is compiled from a much fuller one in Vose's Treatise
on R.R. Construction.
TABLE OF BOLTS AND NUTS CALCULATED FOR A
WORKING STRAIN OF 15,000 LBS. PER
SQUARE INCH OF SECTION.
Diameter. Area. Strength in Weight per Thick's No. thr's
Inches. Sq. inches. Pounds Foot. Square nut. of nut. per inch.
1/2 .19635 2940 0.66 1-1/4 in 3/4 in 12
5/8 .30680 4602 1.03 1-3/8 3/4 10
3/4 .44179 6630 1.49 1-1/2 7/8 10
7/8 .60132 9019 2.03 1-3/4 1 9
1 .78540 11775 2.65 2 1 8
1-1/8 .99402 14910 3.36 2 1-1/8 7
1-1/4 1.2272 18405 4.17 2-1/4 1-1/4 7
1-3/8 1.4849 22260 5.02 2-1/2 1-3/8 6
1-1/2 1.7671 25505 5.97 2-3/4 1-1/2 6
1-5/8 2.0739 31095 7.01 2-7/8 1-5/8 5
1-3/4 2.4053 36075 8.13 3 1-3/4 5
1-7/8 2.7612 41415 9.33 3-1/4 1-7/8 4-1/2
2 3.1416 47130 10.62 3-1/2 2 4-1/2
2-1/8 3.5166 53190 12.00 3-3/4 2-1/8 4
2-1/4 3.9761 59640 13.40 4 2-1/4 4
2-3/8 4.4301 66450 15.00 4-1/8 2-3/8 4
2-1/2 4.9087 73620 16.70 4-1/4 2-1/2 3-1/2
2-5/8 5.4119 81178 18.20 4-1/2 2-5/8 3-1/2
2-3/4 5.9396 89094 20.00 4-3/4 2-3/4 3-1/2
2-7/8 6.4918 97377 21.90 5 2-7/8 3
3 7.0686 106029 23.80 5-1/4 3 3
3-1/4 8.2958 124437 27.90 5-3/4 3-1/4 3
3-1/2 9.6211 144316 32.40 6 3-1/2 2-1/2