Type
The general category or style of the bolt, such as hex head, carriage, lag, or indication of its intended use.
Hex Bolt
Hex bolts feature a hexagonal head with no washer face beneath. These general duty fasteners do not have chamfered threads on the point (end where the nut is threaded) and are used in conjuction with a nut. They are best for connecting rough projects of wood on wood and in general light duty househould construction.
Hex Cap Screw
This hexagonal headed fastener is designed to be screwed into a tapped (pre-threaded) hole or secured with a nut. The underside of these heads are washer faces and the point ends are chamfered. These are used in more specialized situations than hex bolts.
Hex Cap Screw - Drilled Head
These hex cap screws are further secured by wire locking, binding screws together with a safety wire threaded through drilled holes in the fastener head. The safety wire also provides a visual signal that the screw has been properly tightened.
Hex Cap Screw - Left Hand Thread
Left handed hex cap screws tighten when the fastener is rotated counterclockwise. This is useful in rotating machinery or assemblies that may cause a normal right handed fastener to loosen.
Hex Cap Screw - Nylon Patch
Nylon patched screws find their utility when a mechanical locking mechanism is required on a fastener used in a tapped hole.
Hex Cap Screw - Nylon Pellet
A hexcap screw with extra locking strength added in the form of a small nylon bead applied to the threads, preventing loosening through vibration.
Hex Cap Screw - Self-Sealing
Self-sealing hex cap screws have O-rings under the fastener head that keep out fluid contaminants. Compared to plastic washers or chemical thread sealants, the O-rings are not as readily deteriorated by fastener reuse.
Hex Cap Screw - Slotted Head
Slotted hex cap screws have a linear recess in the fastener head for use with flat head screwdrivers. The hex head enables wrench access when there is no overhead space for the flat head screwdriver.
Tap Bolt
Tap bolts are fully threaded hex head fasteners able to accommodate multiple joint thicknesses. Tap bolts may be a good choice when bolt thread length needed is unknown.
Tap Bolt - Slotted Head
Slotted hex cap screws have a linear recess in the fastener head for use with flat head screwdrivers. The hex head enables wrench access when there is no overhead space for the flat head screwdriver.
