How to Choose the Right Wood Screw: A Plain-English Guide

Walk down the fastener aisle and you are looking at hundreds of little boxes. Most people grab whatever is closest and hope it holds. Here is how to actually pick the right wood screw the first time.

Thread: Coarse or Fine

Coarse-thread screws bite into softwoods, plywood, and particleboard. That covers most home projects. Fine-thread screws are for hardwoods like oak and maple, where coarse threads can split the grain. When in doubt on a home project, coarse is the safe default.

Drive Type: What Fits Your Bit

Phillips is the most common and the most likely to strip out under torque. Square drive (Robertson) and star drive (Torx) grip far better and are worth switching to if you are driving a lot of screws. Match your bit to the screw head and you will save yourself a pile of stripped fasteners.

Gauge and Length

The gauge is the thickness, written as a number like #6, #8, or #10. Bigger number, thicker screw. For length, a good rule of thumb is that the screw should sink at least two-thirds of its length into the bottom piece of material.

• Trim and light work: #6 or #8

• General construction and framing repair: #8 or #10

• Heavy structural connections: #10 or larger, or a structural screw rated for the load

Coating: Where Will It Live

Indoor and dry, plain zinc is fine. Outdoors, on a deck, or anywhere it gets wet, you want coated exterior screws or stainless steel. Treated lumber is corrosive, so use fasteners rated for treated wood or the heads will rust out in a season.

Still Not Sure? Ask Us

Bring a sample of what you are fastening, or just describe the job. We have been helping Memphis homeowners and tradespeople pick the right fastener since 1929. Stop by 2909 Park Ave, open 8 to 5 Monday through Saturday.