The Wood Screw Size Chart Generator helps woodworkers choose a practical screw gauge, screw length, pilot hole, and countersink setup. Enter the material, stock thickness, joint type, and load to get a shop-ready recommendation plus a small reference chart.
Match the board, joint, and load. The screw recommendation updates immediately.
| Stock | Material | Screw | Pilot |
|---|---|---|---|
| 1/2 in | plywood | #6 x 3/4 in | 3/32 in |
| 3/4 in | hardwood | #8 x 1-1/4 in | 7/64 in |
| 1 in | softwood | #8 x 1-3/4 in | 3/32 in |
| 1-1/2 in | softwood | #10 x 3 in | 1/8 in |
Choose softwood, hardwood, plywood, or MDF. Dense hardwood and sheet goods need larger pilot holes than soft pine to reduce splitting and mushrooming.
Use the thickness of the top board or the part receiving the screw. The calculator rounds to common screw lengths instead of returning odd sizes.
Choose face fastening, butt joints, panel attachment, or pocket-style assembly. Butt joints and high-load assemblies usually need longer screws.
Use light for trim and panels, medium for cabinet and shop projects, and heavy for outdoor or load-bearing assemblies.
Use the recommended pilot hole and countersink guidance, then test one fastener in scrap from the same material before drilling finished parts.
For many 3/4 inch hardwood or cabinet parts, a #8 screw around 1-1/4 inches long is a practical starting point. Use a pilot hole, avoid drilling too close to edges, and shorten the screw if it would poke through the back side.
A good rule is to get at least the thickness of the top board into the second board when possible. Heavy, outdoor, or structural work may need more embedment and should follow the fastener manufacturer's guidance.
Pilot holes are strongly recommended in hardwood, plywood edges, MDF, thin stock, and near board ends. Softwood can sometimes accept screws without pilots, but pre-drilling gives cleaner, more predictable results.
Pilot hole size depends on screw gauge and material density. A #8 screw commonly uses about a 3/32 inch pilot in softwood and about a 7/64 inch pilot in hardwood or plywood.
Countersink when the screw head needs to sit flush or when splitting around the head is a risk. For thin panel attachment, a pan-head or washer-head screw may be better than countersinking.
Plan lumber, cuts, and assembly before drilling pilot holes.
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