Tools
The bench references I use constantly.
Quick, no-nonsense calculators and lookup tables for everyday hardware work, grouped by job. Free to use — bookmark whatever saves you a search.
Fasteners
Screw and nut sizing — dimensions, hole prep, holding force, and tightening torque, in metric and inch.
Fastener Sheet — Metric
Dimensions, hole prep, and a three-view drawing for M2–M20 screws and nuts.
Fastener Sheet — Inch
The same worksheet for #2–3/4in UNC/UNF screws and nuts.
Holding Force — Metric
Pick a screw by the load it must hold — safe working load for metric sizes.
Holding Force — Inch
Pick a screw by the load it must hold — safe working load for inch sizes.
Tightening Torque — Metric
How tight? Tightening torque, including what the tapped hole can take.
Tightening Torque — Inch
How tight? Tightening torque for inch sizes, hole strength included.
Shop charts
Printable wall charts for the drill press — tap drills, decimal equivalents, and a one-page cheat sheet.
Metric Tap Drill Chart
ISO coarse and fine M1–M24: tap, hard-material, clearance, counterbore.
Inch Tap Drill Chart
UNC/UNF #0–1/2in with drill designation and decimal.
Decimal Equivalents
Fraction, number and letter drills in inch and mm.
Drill Press Cheat Sheet
One page: tap, clearance and counterbore for M2–M12.
Electronics
PCB and circuit math for board layout and bring-up.