Engineering tables
Tap drills, spanner sizes, bolt torque and wire sizing — 238 worked answers, each one showing where the number comes from. The kind of thing you look up with oily hands and no patience for a sign-up form.
Tap drill sizes — metric coarse
Tap drill sizes — metric fine
Tap drill sizes — Unified
#4-40 UNC#43#4-48 UNF#42#6-32 UNC#36#6-40 UNF#33#8-32 UNC#29#8-36 UNF#29#10-24 UNC#25#10-32 UNF#21#12-24 UNC#161/4-20 UNC#71/4-28 UNF#35/16-18 UNCF5/16-24 UNFI3/8-16 UNC5/16 in3/8-24 UNFQ7/16-14 UNCU7/16-20 UNF25/64 in1/2-13 UNC27/64 in1/2-20 UNF29/64 in9/16-12 UNC31/64 in9/16-18 UNF33/64 in5/8-11 UNC17/32 in5/8-18 UNF37/64 in3/4-10 UNC21/32 in3/4-16 UNF11/16 in7/8-9 UNC49/64 in7/8-14 UNF13/16 in1-8 UNC7/8 in1-12 UNF59/64 in
Bolt torque by size
M3 × 0.51.3 N·mM3.5 × 0.62.1 N·mM4 × 0.73.1 N·mM5 × 0.86.2 N·mM6 × 110.5 N·mM7 × 117.6 N·mM8 × 1.2525.5 N·mM10 × 1.550.5 N·mM12 × 1.7588 N·mM14 × 2140.6 N·mM16 × 2218.1 N·mM18 × 2.5301.4 N·mM20 × 2.5425.9 N·mM22 × 2.5580.7 N·mM24 × 3736 N·mM27 × 31,079.1 N·mM30 × 3.51,463.1 N·m1/4-20 UNC11.5 N·m1/4-28 UNF13.1 N·m5/16-18 UNC23.6 N·m5/16-24 UNF26.1 N·m3/8-16 UNC41.9 N·m3/8-24 UNF47.4 N·m7/16-14 UNC67 N·m7/16-20 UNF74.8 N·m1/2-13 UNC102.2 N·m1/2-20 UNF115.2 N·m9/16-12 UNC147.4 N·m9/16-18 UNF164.5 N·m5/8-11 UNC203.5 N·m5/8-18 UNF230.5 N·m3/4-10 UNC361.4 N·m3/4-16 UNF403 N·m7/8-9 UNC582 N·m7/8-14 UNF642.2 N·m1-8 UNC872.6 N·m1-12 UNF955.1 N·m