Mechy
What size do I need?
Straight answers to the size questions: which screw, which bolt, which drill bit, which torque. The answer comes first, then how to check it.
Drill Bit Size for a 1/4-20 Tap (and How to Tap It)Use a #7 drill (0.201 in) for a 1/4-20 tap; 13/64 in or 5.1 mm also work. Clearance holes, 1/4-28, nearby taps, and how to tap cleanly.Drill Bit Size for a 10-32 Tap (Plus 10-24 and 8-32)A 10-32 tap takes a #21 drill (0.159 in). 10-24 takes a #25, 8-32 a #29. Clearance holes, metric and fractional substitutes, and mistakes to avoid.Grease Zerk Thread Size: How to Tell Which You HaveGrease zerk threads: 1/4-28 (taper SAE-LT or straight), 1/8 in pipe (1/8-27), and metric M6, M8 and M10. How to measure yours and avoid look-alikes.Lug Nut Torque Specs: Find Yours and Torque It RightLug nut torque specs come from your vehicle maker, not a generic chart. Where to find yours, real examples, the star pattern, and when to re-check.What Size Bolt Do I Need? (Measure It or Snap It)Find what size bolt you have: measure diameter, thread pitch and length, or match the wrench that fits the head. Inch vs metric look-alikes explained.What Size Screw for 1/2 in Drywall?1/2 in drywall takes 1-1/4 in coarse-thread screws on wood studs and 1 in fine-thread screws on steel. Spacing rules and 3/8 and 5/8 in board too.What Size Screws for a Door Hinge?Most door hinges take #9 x 3/4 in flat-head wood screws. When to use #10 or 1 in screws, and 3 in screws into the stud for security.What Size Screws for a License Plate?License plates take 1/4 in (#14) x 3/4 in self-tapping screws into plastic retainers, or M6-1.0 x 16–20 mm bolts into threaded holes. How to tell which.
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