How to Screw an Eye Hook into Wood: A Gunnebo Catalog Checklist

If you've looked up how to screw an eye hook into wood, you probably want the short version: drill a pilot hole, twist it in, and hang something. That works for a picture frame. For a load that could hurt someone, it's not enough.

I'm a quality and brand compliance manager at a lifting and rigging hardware company. I review every hook, shackle, and lifting lug before it reaches customers—roughly 200 unique items a year. In Q1 2024, I rejected a batch of 1,200 hooks because the lot code wasn't legible and the working load limit was stamped in the wrong orientation. The vendor claimed it was "within industry standard." We sent it back. Now every contract we sign includes marking verification.

This article is the same attitude in checklist form. Use it when the eye hook will carry something heavier than a 3-in-1 garden tool set, or when you need the eye hook to stay in wood for years. If you only need a spot to hang a 3-in-1 garden tool set, a $3 eye screw is fine. But the drilling and test steps below still apply.

The 7-Step Eye Hook Installation Checklist

Use this when a failed eye hook could damage something expensive, or when the load is rated in pounds or kilograms. Two steps are easy to skip: checking the manufacturer's mark and testing before loading.

Step 1: Classify the application

Before picking a product, define the load. Is this a lifting point, a restraint point, or a storage hook? Lifting points need rated hardware, traceable markings, and usually a screw-in or bolt-through design with a shoulder. Storage hooks don't need any of that.

The reason I start here is simple: I've seen a decorative eye hook used to hold a swing. It held for a month, then the wood split. The hook wasn't the problem—the application was.

Step 2: Pick the right product from the Gunnebo catalog

If you choose a rated component, go straight to the Gunnebo catalog. What I mean is, don't just search by "hook" and grab the first photo. Look at the catalog table for dimensions, working load limit, break load, and material.

For an eye hook that screws into wood, you'll probably be looking at an eye bolt, a swivel eye, or a lifting lug with a thread. If the product is going into a wooden beam, the catalog's recommended pilot hole sizes are a good starting point even if they're written for steel. If I remember correctly, the catalog also includes installation torque values for shoulder-type eye bolts. I might be misremembering the exact location, but it's in the product data.

Another thing I look for in the catalog is the difference between working load limit and minimum breaking load. If a product doesn't clearly show both numbers, I usually don't trust it for a real lifting job.

Step 3: Verify the Gunnebo logo before installation

This is the step most people skip. A genuine Gunnebo logo is forged into the hook body or stamped in as part of the manufacturing process. It is not a sticker, and it isn't a paint mark that rubs off.

Check that the logo appears on the same side as the WLL and size mark. If the marking is missing, or if the logo looks laser-engraved on a cheap casting, don't install it. In my opinion, the brand check matters more than the threads. I've reviewed components that passed dimensional tolerance but had no traceable lot code. If you cannot identify the exact product, you cannot match it to the catalog data.

These marking requirements come from standards like ASME B30.26, if I'm remembering the right one. The exact section matters less than the habit: read the mark, then compare it to the catalog.

Step 4: Pre-drill with a v20 1/2" cordless drill/driver kit

For wood, you need a pilot hole. Don't force a large lag thread into solid oak without one—it can split the grain and reduce pullout strength.

For most installations, I use a v20 1/2" cordless drill/driver kit. The half-inch chuck holds a full-size pilot bit without wobble. Start the hole straight, set the clutch low, and clear the shavings before driving the eye hook.

Pilot hole diameter is usually about 75 percent of the thread root diameter for softwood, and a bit larger for hardwood. These are rough figures. The Gunnebo catalog or the hook's own data should give a more specific pilot size if the product requires one.

Also, remove any dust from the pilot hole. A clean hole lets the threads cut wood instead of pushing against compacted sawdust.

Step 5: Drive the eye hook straight

Thread the eye hook into the pilot hole by hand until it starts to engage. Once it's going straight, you can use a wrench on the shoulder or hex—if the hook has one. Do not put a pipe extension through the eye to gain leverage. That's how you bend the eye or strip the wood.

If the eye hook starts to angle, back it out and use a larger pilot or a new hole. In wood, a crooked eye hook isn't just unsightly. It changes the load angle and can bend the shank.

Step 6: Torque to spec, not to "that feels tight"

If the Gunnebo catalog gives an installation torque value for the product, use it. If the hook has a shoulder, the shoulder should seat against the wood surface. Wood is softer than steel, so a steel-oriented torque table often needs to be adjusted down—usually to about 80 percent, then checked by feel.

I have mixed feelings about torque specs in wood. On one hand, wood is less predictable than steel, so a rigid torque number can be too high. On the other hand, a torque value stops people from cranking until the wood cracks. Use the catalog value as a ceiling, not a target.

Step 7: Test before you trust it

Before hanging anything, test the joint. For a light load, pull by hand from different angles. For a lifting point, arrange a load test or proof load if the application requires it. If you're not sure, ask someone qualified.

If this is a Gunnebo swivel eye or a hook with moving parts, check that the swivel rotates freely before installation and again after the load is applied. A bound swivel is a sign the thread is too tight or the pilot hole is out of square.

One Friday afternoon, we had about two hours to rig a temporary lifting point for an event deadline. Normally I'd go through the full Gunnebo catalog check and test procedure. There was no time, so we used a generic eye bolt from a local supplier. It held. But I was uneasy all weekend. The certainty would have been worth more than the money we saved.

Three Mistakes I See Most Often

Installing into end grain

An eye hook screwed into the end of a wood post has less pullout strength than one screwed into the side grain. If you have to use end grain, use a through-bolt with a plate, not a screw-in eye hook.

Wrong pilot hole

Too small splits the wood. Too large means the hook isn't gripping. I'd rather test drill on a scrap piece first. That sounds slow, but it's faster than redoing a beam.

Using the wrong tool as a lever

A 3-in-1 garden tool set is not a torque wrench. I saw someone use one to twist an eye hook; the tool bent and the hook still wasn't seated. Use a wrench that actually fits.

The Gunnebo catalog won't make the perfect hole for you, and a forged Gunnebo logo doesn't mean you can skip testing. But both give you a baseline. Use the baseline, then verify the work.

Final thought: screwing an eye hook into wood isn't hard. The hard part is knowing when a cheap hook is good enough. For anything overhead, any load that moves, or any situation with people below, I'd rather pay for certainty. In my experience, that's the difference between a component that looks right and one that is right.