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PLATE B-11
STRENGTH OF U.S. STANDARD
BOLTS FROM ¼" TO 2" DIAMETER 

BOLT AREAS TENSILE STRENGTH, LBS. SHEARING STRENGTH, LBS.
Diameter of Bolts,
Inches		 Number of Threads per Inch Full Bolt, Sq. In. Bottom of Thread, Sq. In. At 10,000 Lbs. Per Sq. In. At 12,500 Lbs. Per Sq. In. At 17,500 Lbs. Per Sq. In. FULL BOLT BOTTOM OF THREAD
At 7,500 Lbs. Per Sq. In. At 10,000 Lbs. Per Sq. In. At 7,500 Lbs. Per Sq. In. At 10,000 Lbs. Per Sq. In.
¼ 20 0.049 0.027 270 340 470 380 490 200 270
5/16 18 0.077 0.045 450 570 790 580 770 340 450
3/8 16 0.110 0.068 680 850 1,190 830 1,100 510 680
7/16 14 0.150 0.093 930 1,170 1,630 1,130 1,500 700 930
½ 13 0.196 .126 1,260 1,570 2,200 1,470 1.960 940 1,260
9/16 12 0.248 0.162 1,620 2,030 2,840 1,860 2,480 1,220 1,620
5/8 11 0.307 0.202 2,020 2,520 3,530 2,300 3,070 1,510 2,020
¾ 10 0.442 0.302 3,020 3,770 5,290 3,310 4,420 2,270 3,020
7/8 9 0.601 0.419 4,190 5,240 7,340 4,510 6,010 3,150 4,190
1 8 0.785 0.551 5,510 6,890 9,640 5,890 7,850 4,130 5,510
1 1/8 7 0.994 0.693 6,990 8,660 12,130 7,450 9,940 5,200 6,930
1 ¼ 7 1.227 0.890 8,890 11,120 15,50 9,200 12,270 6,670 8,900
1 3/8 6 1.435 1.054 10,540 13,180 18,450 11,140 14,850 7,910 10,540
1 ½ 6 1.767 1.294 12,940 16,170 22,640 13,250 17,60 9,700 12,940
1 5/8 5 ½ 2.074 1.515 15,150 18,940 26,510 15,550 20,740 11,360 15,150
1 ¾ 5 2.405 1.745 17,450 21,800 30,520 18,040 24,050 13,080 17,440
1 7/8 5 2.761 2.049 20,490 25,610 35,860 20,710 27,610 15,370 20,490
2 4 ½ 3.142 2.300 23,000 28,750 40,500 23,560 31,420 17,250 23,000