Screw tools
Everything you need to identify, size and fit a small screw — no sign-up, works on a phone while the device is open in front of you.
Screw size finder
Type in what you measured with a caliper and get the metric size, pitch and likely length.
Tap & clearance hole calculator
The exact drill size to tap M1.2 to M6, plus close and normal clearance holes.
Metric ↔ imperial converter
Convert mm to inches, and see which US screw number sits closest to each metric size.
Torque calculator
Safe tightening ranges for small screws into steel, aluminium and plastic bosses.
Thread pitch & head size chart
Coarse and fine pitches, head diameters, hex key sizes — one table for every size.
Driver & bit identifier
Phillips, JIS, Torx, pentalobe, tri-point — which bit fits which screw, and why the wrong one strips it.
Material & finish picker
Stainless A2 vs A4, black oxide, brass, titanium, nylon — pick by corrosion, strength and magnetism.
Screw length & thread engagement
How deep a screw must bite in steel, alloy or plastic — and the total length to buy.
Pilot hole calculator
The right hole for a self-tapping screw in plastic, sheet metal, wood or a 3D print.
Countersink chart
Diameter, depth and angle so a flush screw actually sits flush — including the 82 vs 90 degree trap.
Screw substitution checker
One screw short? Check whether the one in your parts jar is a safe swap before you drive it in.
Thread pitch counter
Count threads against a ruler and find the pitch, the metric size, and any imperial look-alike.
Nut & washer size chart
Spanner sizes, nut heights and washer dimensions for every metric screw from M1.2 to M6.
Bit size finder
PH00, PH0, T6, T8, 2.5 mm hex — the exact bit number for each screw size.
Standoff & stack calculator
Board, washer and standoff added up, so a PCB screw neither bottoms out nor falls short.
Screw strength calculator
How much load an M2 to M6 screw can take in stainless, 8.8, 10.9 or 12.9 steel.
Screw weight & quantity estimator
Weigh a bag of screws to count them, or estimate the weight of the batch you are ordering.
Stripped thread repair sizer
Pick between a bigger screw, an insert or a heli-coil — with the drill size for each route.
Repair kit builder
Build a screw assortment for laptops, phones, drones or 3D printers and see exactly what to buy.