Why Hand Tools Rust, and What It Costs
Most hand tools are made from steel, and steel rusts when it meets moisture and oxygen. Humidity swings, a damp garage, sweaty hands and a forgotten wet tool outdoors are all enough to start surface rust. Light rust is mostly cosmetic, but left alone it can pit the metal, roughen working surfaces, dull edges, seize moving parts and weaken a tool over time.
The reassuring part is that prevention is cheap. Most rust problems come from a short list of causes, and a few habits cover them.
Clean After Use
Cleaning right after a job is easier than waiting until grime hardens. A simple routine works for most tools:
- Brush or wipe off debris. Remove sawdust, dirt, metal chips and old grease with a brush or dry rag.
- Remove sticky residue. Resin, adhesive and sap can be cleaned with a rag and an appropriate solvent. Choose a product that suits the tool and your workspace, work in good ventilation, and follow the label.
- Dry completely. Any water left on steel, including from washing or from outdoor jobs, invites rust. Wipe thoroughly, and pay attention to joints, threads and the insides of sockets and pliers.
Make cleaning after use part of the end of every work session, so it is not a separate chore. For tools that get wet or very dirty, such as shovels or garden pruners, a rinse followed by a thorough drying is typically enough.
Avoid soaking tools that have wooden handles, which can swell or crack, or tools with electronics or sealed bearings.
Oil and Protect
A thin film of oil is the most common barrier against moisture. Several kinds are used:
- Light machine oil on pivots, hinges and sliding parts of pliers, snips, adjustable wrenches and clamps.
- A thin coat of protective oil or wax on bare steel surfaces, such as plane soles, saw plates, vise screws and cast-iron tables.
- Dry lubricants where oil would attract dust, for example some sliding parts.
The word “thin” matters. Too much oil drips, gathers dust and can stain wood. Apply a small amount to a rag, wipe it over the metal and buff off the excess. Keep oiled rags in a safe container, since some oils, particularly those used for wood finishing, can heat up and ignite on their own as they dry. Safe handling of finishing rags is worth reading about before you store any oily cloths.
Do not oil surfaces that touch food or surfaces where grease would cause trouble, such as the faces of sandpaper pads or the teeth of a file you want to grip. Follow the manual for any tool with specific lubrication rules.
Removing Light Rust
Light surface rust can usually be removed without special tools:
- Rub with fine steel wool, a nylon abrasive pad or a fine abrasive paper, using a little oil as lubricant.
- For stubborn spots, a commercial rust remover or a mild acid-based soak is sometimes used. Follow the product instructions carefully, wear gloves and eye protection, and rinse and dry well afterward.
- A rust-stained fastener or stuck part may respond to a penetrating oil, which helps loosen corrosion on threads.
Afterward, dry the tool and apply a protective film. Do not use abrasives on a ground working surface, such as a machined square or a polished plane sole, without care, since you can remove accuracy along with rust. Deep pitting is generally permanent and can mean a tool is best retired, particularly when it affects safety, such as on a hammer head or a chisel.
Controlling Moisture Where Tools Live
Rust prevention is about the environment as much as the tool.
- Raise humidity awareness. Basements, uninsulated garages and sheds can be humid or see condensation when temperatures swing. A small hygrometer shows what you are dealing with, and moisture-absorbing products or a dehumidifier can help in the worst spots.
- Avoid cold-to-warm shocks. Bringing a cold tool into warm, moist air can make condensation form on it.
- Keep tools off concrete floors, which can wick moisture.
- Use closed storage. A lidded toolbox, a drawer or a tool roll limits exposure to moist air. Lining drawers with a rust-inhibiting paper or a thin cloth is a common practice.
- Skip damp wood and cardboard for long-term storage, since both can hold moisture.
Good toolbox storage keeps tools separated so that they do not bang edges, and so that moisture does not hide between them. A magnetic strip is a handy way to hang tools in open air with space around each, though in damp spaces you may want to oil or wax tools hung on exposed metal.
Over a longer span, the conditions listed under equipment storage conditions matter too: dry, stable temperature, and out of direct rain, sun or plumbing leaks. Before putting a tool away for the season, run through the upkeep before storing routine of cleaning, drying and oiling.
Handles, Edges and Moving Parts
Cleaning is not only about metal. Wooden handles benefit from an occasional light rub with boiled linseed oil or a similar finish, applied sparingly. Cracked, splintered or loose handles on hammers, axes and chisels are a safety issue and should be repaired or replaced. Edge tools need extra care: wipe them dry, protect them with a light coat of oil, and keep them in sheaths or racks so edges are not damaged.
Check moving parts such as vise screws, adjustable wrench jaws, pliers joints and ratchet mechanisms. If they feel gritty, clean away the debris and add a drop of light oil. Stuck parts should be freed gently, not hammered.
A Short Routine
After each use: wipe, dry and put the tool away. Monthly or seasonally: look through your tools for spots of rust, oil moving parts and check handles. Annually: clear out and clean your storage, replace moisture absorbers, and replace tools beyond repair.
General information only; read the label on any chemical you use and follow the maker’s instructions for each tool.