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Table of Contents

Table of Contents

Varieties of Screws/Bolts

Wood Screw

    • Has a sharp point.
    • Generally has an unthreaded shank below the head.
    • Designed to attach 2 pieces of wood.

Image of a wood screw.Image ModifiedImage of various wood screws.Image Modified

Sheet Metal Screw

    • Use sharp points and threads and are designed to be driven directly into sheet metal. They can also be used in softer material like plastic, fiberglass, and wood.

    • Self Drilling Sheet Metal Screw

      • Sheet metal screw with a self-drilling point.

Image of sheet metal screw.Image Modified Image of self drilling sheet metal screw.Image Modified

Machine Screw

    • Smaller fastener threaded the entire length of the shank.
    • Usually has a recessed drive type.
    • Has a thread class

    • Thread-Cutting Machine Screw

      • Machine screw with a thread-cutting (self-tapping) point.

Image of machine screw.Image Modified

    Image of thread cutting machine screw.Image Modified

Set/Grub Screw

    • Is headless.

    • Fix a rotating part to a shaft.

    • Used only for transmitting very light loads.

Image of set screw.Image ModifiedImage of various set screws.Image Modified

Socket Screw

    • A machine screw with an internal hex socket (Allen) drive. longer lengths may have a smooth upper shank.

Image of socket screw.Image ModifiedImage of socket screws.Image Modified

Shoulder Screw/Bolt

    • Shank is ground to a precise diameter and threaded portion is smaller in diameter then the shoulder. These fasteners can be used to create a pivot point.

Image of shoulder screw.Image ModifiedImage of shoulder screw.Image Modified

Barrel Nut/Mating Screw

    • Used for through-bolting applications where a head is desired on both sides of the joint.

Image of barrel nut and mating screws.Image Modified


Fastener Heads

Flat Head

    • A countersunk head with a flat top.

Image of a flat head fastener.Image ModifiedImage of a flat head fastener.Image Modified

Round Head

    • A domed head.

Image of a round head fastener.Image ModifiedImage of a round head fastener.Image Modified

Oval Head

    • A countersunk head with a rounded top.

Image of an oval head fastener.Image Modified

Hex Head

    • A hexagonal head, can have a washer or flange modification.

Image of a hex head fastener.Image Modified Image of a hex head fastener with a washer modification.Image Modified Image of a hex head fastener with a flange modification. Image Modified

Slotted-Hex-Washer Head

    • A hex head with a built-in washer and slotted drive.

Image of a slotted hex washer head fastener.Image Modified

Button Head

    • A low profile rounded head using a socket drive.

Image of a button head fastener.Image Modified

Socket Head

    • A small cylindrical head using a socket drive.

Image of a socket head fastener.Image ModifiedImage of a socket head fastener.Image Modified

Drive Types

Socket/Hex/Allen Drive

    • Hexagonal hole for use with an Allen wrench.
    • Often used in bicycle maintenance and furniture.


 

Phillips and Frearson Drive

    • An X shaped drive.
    • Designed to cam-out after a certain torque limit.

Image of a Phillips drive.Image Modified Image of a Phillips drive.Image Modified

Slotted Drive

    • A slot in the head, used with a flathead installation tool.
    • Most popular.
    • Less likely to have rounded or stripped slots.

Image of a slotted drive.Image Modified Image of a slotted drive.Image Modified

Combination Drive

    • A combination of slotted and Phillips drives.

Image of a combination drive.Image Modified

Square/Robertson Drive

    • A square-shaped drive type.
    • Often used in automotive and furniture industries.
    • Has the highest torque tolerance.


 

Star/Torx Drive

    • A six-pointed star pattern specifically designed to prevent cam-out and stripped heads.

  

One-way Drive

    • Installs with a normal slotted or "flathead" installation tool but can not be removed without special tools.
    • Often used on barrel nuts and mating screws.

Image of a one-way drive.Image Modified

Additional Reading:

Rivets (Page Link)

References

Contributors:

Contributors Summary
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