Screws and bolds buying guide

Which screws and bolds are used for what task? Chipboard screws, carriage bolts, wood screws? We will help you on your way with the below buying guide.

Tip: Using a wrong screwdriver, screw bit or spanner will damage the screw head. Please make sure to have all types of screwdrivers (and bits) at your disposal.

Screws

Round head wood screw

This screw remains on the material. The thread does not run all the way to the head. It is usually equipped with a slot head.

Pan head wood screw

In this variation of the round head screw, the head tapers at the bottom. Because of this it falls into the wood and creates a beautiful finish.

Flat head wood screw

This screw has a tapered head which must be able to sink into the ground. That is only possible if the wood is soft enough (for example pine) or if you have cleared the hole in advance with a countersink drill. Also the thread does not run all the way to the head. They are available with different head types (slot, P2, PZ).

Chipboard screw

This is a flat head screw which runs all the way to the head. The coarse winding and sharp end ensure the screws to cut into the wood easily, which often makes drilling not necessary. Chipboard screws feature a pozidrive cross head (PZ).

Drywall screw

The pitch of a drywall screw is finer than that of a chipboard screw. Moreover, they have a Philips cross head. Because of this always use a PH or P2 screwdriver (or bit).

Lag screw or Lag bolt

Lag bolts can take a lot of weight. For example, they are very suitable for hanging heating radiators, anchoring beams in concrete floors and securing (heavy) table legs. They have a hexagonal head which can be tightened by using a spanner.

Parker screw

The very sharp pitch of these metal screws run all the way to the head, under a slightly more acute angle, which makes it easier to go through metal. By itself it creates a screw thread in the metal (self-tapping). It is advisable to first drill the metal by using a metal drill bit with a slightly smaller diameter than the thickness of the parker.

Screw eyes, hooks and screw thumbs

These screws are not meant to connect materials, but in order to hang things. A screw eye has a completely closed ring and at the screw hook, the ring is not completely closed. Tightening is easier when you put a screwdriver through the ring and use it as a lever to give power.Screw hooks are available with and without slot. The latter you can tighten by using a screwdriver.

Tip: To prevent the bolt to be drawn into the material, first place a ring on the head and nut side. The nut will stay in place by using a spring washer on the nut side.

Bolts

Bolts are going through both materials which need to be connected. By tightening the bolt, it creates a very strong connection. It is better to tighten the nut with a spanner and not with a combination or pipe wrench. These tools will damage the head of the bolt. Moreover, you need two spanners: one to tighten the nut and the other one to keep the bolt in place and to prevent it from rotating.Bolts are available in various sizes (M6, M8, etc.), which go together with nuts with the same designation.

Tip: A lock nut is a nut provided with a plastic layer, which rolls while rotating. This provides additional protection against loosening.

Carriage bolts

These bolts have rounded heads, which create a nice finish on your material. Directly under the head is a square part. Insert the bolt through the hole and tap on the head with a hammer in order for the square part to penetrate into the wood. Now, the bolt is fixed and can not rotate during tightening the nut.

Stud

A stud is actually a long bolt without a head, which you can cut to size. A connection is made by  placing a washer and a nut at both ends. To prevent you from placing the nuts crooked on the thread, you can file away the burrs on the cutting plane.

Allen bolts

These bolts have a head with a hexagonal hole. You tighten them with a wrench. The advantage of this bolt is that you have optimum grip with the wrench, so you can put a lot of force.