Cam Lock or Screws? Choosing a Sturdier Assembly

How cam locks work

A cam lock joint has two parts: a metal cam (the lock body) and a pin (the dowel screw). You insert the pin into one panel, align the cam with it, and turn the cam with a screwdriver. The cam pulls the pin and draws the two panels tightly together. Many ready-to-assemble tables use cams because they let a flat box become a three-dimensional piece of furniture without visible screw heads on the exterior.

The strength of a cam lock depends on how deep the pin bites into the wood (usually particleboard or MDF), the metal quality of the cam, and whether the joint is reinforced with a wooden dowel nearby. A cam lock alone resists pulling apart, but it does little to stop twisting or racking (side-to-side wobble). For that, the manufacturer must add dowels or a metal bracket.

You can often identify a cam lock table before purchase: look at the assembly manual images or the product photos that show the underside of the table. If you see round plastic caps or small metal circles on the inside face of a panel, that is a cam lock. The table's own spec page or manual is your best source for this detail.

• Cam locks are common in flat-pack furniture because they are fast to install at the factory and allow knock-down construction.
• They require precise alignment; a misaligned cam grips less material and is more likely to strip its hole.
• Over time and with temperature changes in the room, the particleboard around the cam can compress, loosening the joint.

How screw joints work

A screw joint is simpler: a screw passes through one panel and threads into the panel beneath it. The thread grips the material along the entire length of the screw, not just at a single point. In a typical coffee table, you will find screws holding the aprons (the side rails under the top) to the legs, and sometimes screws driven at an angle (pocket screws) to join the top panels.

Because a screw engages along its whole length, it resists both pulling apart and sideways shearing better than a cam that grips at one metal-to-pin point. If the joint loosens, you can tighten the screw with a screwdriver. If the screw strips its hole, you can usually insert a wood filler or a slightly larger screw. With a cam lock, a stripped cam hole often means the entire panel is compromised, and repair requires drilling new holes.

Screws do have a downside: their heads are visible unless the maker countersinks them and covers them with a cap or wood plug. Some designs hide screws under the tabletop, making them invisible in normal use. Screws also require the manufacturer to drill pilot holes; otherwise, driving a screw into particleboard can crack the board.

Sturdiness: cam lock vs screw

For a coffee table that will hold drinks, books, and the occasional foot, both methods can work, but they are not equal under stress. The most common failure in a cam lock joint is loosening from lateral pressure. When you lean on the table edge or push it across the floor, the top panel shifts slightly, and the cam pin loosens its bite. After a year of normal use, a cam-only table may develop a visible wobble.

A screw joint, by contrast, holds the panels in a fixed position. The threads prevent lateral movement, and the head clamps the top panel. Even if the wood compresses slightly, re-tightening the screw restores the firmness. For this reason, many higher-end flat-pack brands use screws for the primary structural connection (leg-to-apron or top-to-apron) and reserve cams for non-structural shelving.

That said, you should not judge a table by one joint type alone. A table with cam locks plus dowels, metal corner braces, or a solid wood frame can be sturdier than a table with only a few long screws in soft particleboard. The panel thickness also matters: a cam lock in a thin panel has less material to grip than one in a thicker panel. Check the spec sheet or assembly manual for the panel thickness and the number of cam locks per corner.

What to check before you buy

You cannot always choose the joint type, but you can predict which tables will stay firm longer. Look for these signs in the product description, assembly manual, or photos: screws for the structural connections (plate to top, legs to apron), a wooden frame under the top, or a manufacturer that explicitly lists hardware like metal brackets or dowels. Tables with a solid wood apron are usually sturdier than those that rely on particleboard alone.

If you are comparing two similar tables and one is cam-lock-only while the other uses screws for the main joints, choose the screw version if long-term firmness is your priority. If you prefer the clean look of a cam-lock table, plan to check the tightness of every cam after a few weeks of use and again every few months. The learn articles on assembly and sturdiness have more details on what to inspect.

Also consider how the table will be moved. A cam-lock table can be disassembled for moving, which is an advantage. Screw joints are more likely to be permanent or semi-permanent. For a rental apartment where you will move often, cam locks that you can re-tighten might be acceptable. For a table you plan to keep in one spot, screws will serve you better.

• Look for screws in the leg-to-apron and top-to-apron joints, not just in the cam locks.
• Prefer tables with a picture-frame apron under the top; this reduces racking even with cam locks.
• Check the panel thickness: thicker panels give cam locks more material to bite into.
• If the manual shows dowels next to each cam lock, the joint is more resistant to twisting.

Repair and maintenance

Even a well-built table will loosen with use. For screw joints, the fix is straightforward: tighten the screw with a manual screwdriver (a power driver can strip the head). If the screw spins freely, remove it, insert a wooden toothpick or a plastic wall anchor into the hole, and re-drive the screw. This works for both particleboard and solid wood.

For cam locks, the repair is trickier. If the cam turns but does not pull the pin, the pin is likely loose in the board. Remove the pin, apply wood glue to a wooden dowel that fits the hole, insert it, and re-drill the pilot hole for the pin. If the cam itself has stripped the metal housing, you may need to order a replacement cam from the manufacturer or replace the entire panel. Check the table's warranty and part availability before buying a cam-heavy model; see the warranty check for guidance.

To prevent problems, always assemble the table on a flat surface and tighten cam locks in the order the manual specifies, usually from the center outward. Over-tightening a cam can crack the particleboard, so turn it until snug, not with force. For screws, use the provided wrench or screwdriver; avoid adding washers unless the manufacturer includes them.

Verdict: which should you choose?

For a sturdier, longer-lasting coffee table, choose one that uses screws for the main structural joints, especially between the top and the frame and between the legs and the apron. Cam locks are acceptable for non-structural panels or for tables you will move frequently, but they will loosen with normal use and are harder to repair.

If you find a table you love that uses cam locks, do not reject it outright. Check for dowels, a solid wood frame, and a manufacturer with a good record of supplying replacement parts. With careful assembly and periodic re-tightening, a cam lock table can serve well for several years.

For more on choosing the right table for your needs, see the guides to small, medium, and large coffee tables. If you are on a budget, the budget-friendly guide shows models where assembly quality is a key differentiator.

What to pick for your use

Questions

Are cam locks weaker than screws in a coffee table?

Generally yes, for resisting lateral pressure and long-term loosening. Screws engage along the whole thread length, while a cam grips at one pin. But a cam lock with dowels and a solid frame can be sturdy enough for normal use.

Can I repair a loose cam lock on my coffee table?

Yes, if the pin is loose in the panel. Remove the pin, fill the hole with wood glue and a dowel, re-drill, and reinsert the pin. If the cam itself is broken, you may need replacement hardware from the manufacturer.

How do I know if a coffee table uses cam locks before buying?

Check the product photos for the underside or the assembly manual in the listing. Look for round plastic caps or small metal circles on panel faces. The manufacturer's spec page or manual is the most reliable source.

Do all flat-pack coffee tables use cam locks?

Most do for at least some joints, but many use screws for the primary structural connections. Read the assembly instructions or ask the seller which fasteners hold the legs and top to the frame.

Will cam locks loosen with temperature changes?

Wood and particleboard expand and contract with humidity and temperature. A cam lock has less clamping force than a screw, so it is more likely to loosen from these changes. Re-tighten periodically to keep the joint firm.