Types of Bolt Screws

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Types of Bolt Screws
Bolts connect materials together. (Jupiterimages/Photos.com/Getty Images)

A bolt is a fastener that helps keep materials together during construction. It has a head and must work with a nut for proper installation. Some have threads, while other bolts have a smooth surface. Bolt heads may vary in shape and size.

Hanger Bolts

Manufacturers use hanger bolts in furniture. One end of a hanger bolt has a wood thread with a flat top and a pointed machine thread on the other end. This type of bolt is available in a stainless steel 18-8 and is resistant to corrosion and a choice for marine applications. However, manufactures make plain steel hanger bolts from low carbon steel and most people use this bolt inside a building.

Hex Bolts

Standard bolts have a flat, smooth hexagonal head. Some people may refer to a hex bolt as a machine bolt or hex cap screw. It includes a smooth shoulder section and threads on the lower section. These types of bolts are available in various types of grade of steel. For example, the steel grade 2 hex bolt, made from zinc-cased low carbon steel, is suitable for general use not requiring high strength. The steel grade 5 hex bolt comes from zinc-plated medium carbon steel and is in applications such as automobile manufacturing.

Shoulder Bolts

Manufactures use shoulder bolts to produce a pivot point. It is tightened with an Allen wrench and is available in treated alloy steel and stainless steel 18-8. Some applications, depending on the material of the shoulder bolt, include marine applications or applications that need a heavy-duty bolt. Another name for a shoulder bolt is a stripper bolt.

Lag Bolts

Lag bolts join pieces of woods together. Some home improvement stores carry zinc-plated steel, silicon bronze and hot-dipped galvanised lag bolts. Manufacturers may use lag bolts in marine applications.

Sex Bolts

A sex bolts is a female bolt with a knurled barrel that remains still while a person fastens the male bolt. It is available in a pair or set such as one female and one male. Manufacturers recommend the sex bolt for non-solid metal doors. Some applications include installing emergency exit doors.

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