The twist drill bit was invented by Steven A. Morse of East Bridgewater, MA, in 1861. - Wikipedia This chart is for SEA taps and drills.
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Steel Bolts - SAE Grades SAE GradeHead MarkingSize Range (in)Minimum Proof Strength (103psi)Minimum Tensile Strength (103psi)Material 1 1/4 - 1 1/2Low - medium carbon steel 2 1/4 - 3/4 7/8 - 1 1/255 3374 60Low - medium carbon steel ...
漂流,游荡', 'drill' => 'n.钻头,操练 v.训练', 'drink' => 'v.喝,饮 n.饮料,酒', 'drip' => 'v.滴下,流下', 'drive' => 'v.驾驶,乘车 n.车道', 'driver' => 'n.司机', 'droop' => 'v.下垂', 'drop' => 'v.落下 n.滴,下降', 'dropout' => 'n.中途退出者', '...