Types of Screws

Screw designs vary widely to suit particular tasks or materials. Some of the more specialized screws are available only in a limited range of sizes.
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Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Traditional Wood Screw

A wood screw has a tapered shank. With the correct pilot hole, it fits very tightly.

Drywall Screw

Coated with black phosphate, drywall screws are used to fix drywall to studwork.

Modern Wood Screw

Because they are untapered, modern wood screws are less likely to split wood than traditional wood screws. A pilot hole is not always needed.

Masonry Screw

These screws are used in masonry with no need for a wall plug, though a pilot hole is still needed. Some have a blue coating.

Decking Screw

These long screws are designed for screwing down deck boards.

MDF Screw

MDF screws are designed with a sharp point and twin-thread that perform initial penetration. Farther up the shank, a single, coarser thread holds the screw tightly in position.

Lag Screws and Lag Bolts

A lag screw or lag bolt is a heavy-duty fastener that is inserted by rotating the head with an adjustable wrench.

Chipboard Screw

Used for fixing down chipboard flooring, chipboard screws are often wax-coated.

Sheet Metal Screw

A sheet metal screw cuts its own thread. Commonly used with sheet metal, they are typically pan-headed or round-headed. Some general-purpose sheet metal screws have a self-tapping action.

Mirror Screw

A mirror screw also holds fittings where access may be required (such as a bath panel). A decorative dome fits over the screw head.

Dowel Screws

Threaded at both ends, dowel screws join two lengths of wood (curtain poles, for example).