About L Series Stitching Pins
When considering which stitching pin to choose for a particular repair, you will want to understand the functions of our two types of pins. This page will give you information about the L Series stitching pins. Read about our CASTMASTERô pins on the C Series page.
The most important thing to remember about the L Series pins is that when tightened into the casting they seal on the threads because the pin is bigger than the tapped hole. This results in spreading pressure on the crack. If the casting doesn't have enough structural strength to contain the spreading pressure, extension of the crack can occur. Remember, L Series pins create spreading pressure.
Because the L Series pins seal on the threads, it is possible to install them at steep angles to the surface. This is why they are so popular for repairing cylinder heads. The combustion chambers of cylinder heads are, in most cases, very strong structural shapes. The L Series pins perform extremely well in these applications. There are some specific repair where the C Series pins are required, but for most cases L Series pins really do a good job. L Series pins are also used in conjunction with locks.
Our L Series pins consist of three different diameters, several different thread lengths, and are made of either steel or aluminum. The steel pins are made of a soft machinable steel that has the same expansion rate as cast iron with about the same hardness and corrosion resistance. Our aluminum pins are made of 2024 T4 aluminum. This is a harder, stronger grade of aluminum than most castings are made of.
If your repair doesn't run along an inside or outside corner, or doesn't run into a freeze plug hole or bolt hole, and doesn't require the addition of structural strength, the L Series pin can seal a leak or fill a gap faster and easier than anything else you've ever seen. (For those other repair situations, see C Series.)
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