Everything You Need To Know To Find The Best Double Head Screw Nut

Fastener Categories

Wood Screws
Screws with a smooth shank and tapered point for use in wood.
Abbreviated WS Machine Screws
Screws with threads for use with a nut or tapped hole.
Abbreviated MS Thread Cutting Machine Screws
Machine screws with a thread cutting (self tapping) point. Sheet Metal Screws
Fully threaded screws with a point for use in sheet metal.
Abbreviated SMS Self Drilling SMS
A Sheet metal screw with a self drilling point. Hex Bolts
Bolts with a hexagonal head with threads for use with a nut or tapped hole.
Abbreviated HHMB or HXBT Carriage Bolts
Bolts with a smooth rounded head that has a small square section underneath. Lag Bolts
Bolts with a wood thread
and pointed tip.
Abbreviated Lag Flange Bolts
Flange bolts have a flange on the bottom of the head that distributes the load like a washer. Socket Screws
Socket screws, also known as Allen head, are fastened with a hex Allen wrench. Eye Bolts
A bolt with a circular ring on the head end. Used for attaching rope or chain. Eye Lags
Similar to an eye bolt but with wood threads instead of machine thread. U-Bolts
Bolts in U shape for attaching to pipe or other round surfaces. Also available with a square bend. J-Bolts
J shaped bolts are used for tie-downs or as an open eye bolt. Shoulder Bolts
Shoulder bolts (also known as stripper bolts) are used to create a pivot point. Elevator Bolts
Elevator bolts are often used in conveyor systems. They have a large, flat head.