Selecting Quarter-Turn Fasteners
The simple quarter-turn design works perfectly for securing panels that required frequent and quick removal. The self-locking feature is very strong — safe enough that the aircraft industry began using them back in the 1930s. Today quarter-turn fasteners have been the standard for all kinds of racing and street rod applications. From hood scoops, body panels, and interior pieces, to access panels, or you name it; if there’s a will, there’s a way you can put them to good use.
The springs are typically secured to a spring plate that is held in place with two rivets. Speedway offers two types of springs: a flat spring, and a ¼-inch stepped spring. The thickness of material you're using will determine which spring and fastener to use. The ¼-inch stepped-spring is used when the material thickness is considerably thin or thick. The stepped-spring can be flipped over and used with thinner material, when a shorter-reach fastener is used. Take your measurement by adding the thickness of the material to the installed spring height. The installed height of a flat spring is approximately .150-.175 inches, and a stepped spring is .400-.425 inches.
Depending on what design you’re looking for, Speedway offers several options to choose from. We supply plastic, aluminum, or steel fasteners, which feature large or small heads. You can also choose from oval head, flush mount, or butterfly head design. The lengths range from .500 to .800-inch reach in order to fit a variety of material widths. Self-ejecting fasteners are designed with a spring that creates tension for quick release and it holds the button in place after being released. This is a common option used on drag racing, oval track and off-road applications where speed is critical.
-A) Avoid measuring and save yourself the time by using a transfer punch tool. You simply slide this guy over the spring, hold your panel in place and lightly tap with a rubber hammer. Now you have a mark to drill out for your fastener.
-B) If you’re using flush-mount fasteners, the Moroso dimple tool is ideal for countersinking the sheet metal. The two-piece design is zinc plated and transfers a precise .866-inch overall dimple. It can be used with single or double panel sheet metal.
-C) How annoying is it when you try using a tool that isn't right for the job? Screwdrivers never seem to quite fit right, so we designed fastener tools that are specifically sized for quarter-turn fastener heads. Choose from economy, standard, or deluxe, all guaranteed to make life easier during the chaotic rush of the pits.