![]() These innovative products are possible because of advances in machinery technology and the ingenuity of our development team. We manufacture a complete line of stitching pins, locks, thread repair inserts, kits with tooling and accessories for you to use to create dependable, durable repairs. Repairs done properly with LNS products do, indeed, endure. This is an architectural icon, a monument to freedom and humanity that must stand forever. The dome itself weighs almost 9 million pounds and is made of cast iron. He performed a repair on the US Capitol Dome in Washington, DC. Possibly the most prestigious repair to date performed using LNS products was done by the developer, Gary Reed. These products have been extensively tested, approved, and used by General Motors, Navistar, Caterpillar, Cummins Diesel, Mack Truck, Chrysler, Dresser Rand, Cooper Bessemer and many others. These repairs have been performed by both LNS repair personnel and LNS product customers to parts used in oil & gas, automotive, power generation, mining, railroad, trucking, metal working, construction, agriculture, shipping, and other industries. have been used for hundreds of thousands of successful repairs in many industries. The products developed and patented over the old metalocking process by LOCK-N-STITCH Inc. C Series (CASTMASTER™) stitching pins don't spread the crack, in fact they pull the sides of the crack together. Inside and outside corners are now as easy as flat surfaces. LNS pins and locks create strength and seal over every linear inch of the repair.Ĭomplex contours. Stress free, uniform repairs seal without the use of epoxies and coatings required by inferior stitching products. Perfect metal-to-metal finishes are easy to accomplish. All LNS pins have shoulders that set into the casting so the threads aren't exposed at the surface. The pins are designed with a breakoff groove that causes each pin to break off at the same predetermined torque.įlawless finish. Up to one inch of repair can be done in 5 minutes in 1/4" thick cast iron.Įase of use. Installing LNS products can be done quickly with pneumatic tools. Here is a glimpse at the advantages of metal stitching now at the fingertips of repair craftsmen. Often large industrial repairs with structural damage only that don't require sealing the crack can be repaired with Locks only Many repairs may require using only stitching pins such as in cracked cylinder head repairs and cracked engine block repairs. This lack of precision and size limitation leaves the old process seriously lacking in strength and function. ![]() ![]() Our receiving hole patters are completely created by drilling unlike the old Metalock process that relies on drilling spaced out holes and then using crude chiseling procedures to connect the holes. LNS has a wide range of locks for performing repairs. Locks have also evolved over the years and have been created in many shapes, sizes and strengths. Locks require a flat spot for installation. They are primarily used in industrial repairs although there are applications in smaller castings. The other element of metal stitching or metalocking is the locks. There are currently two styles and multiple thread lengths and diameters available from LNS: L Series and C Series. Modern CNC machining processes have made it possible to manufacture new patented thread and design technologies that have made very important improvements to the art of casting repair. Over time, these items have been called 'plugs', 'pins' and 'stitching pins'. Some of the items that have been and are still used are: bolts (copper-and zinc-plated) tapered plugs (both threaded and non-threaded) threaded rods screws set screws dowels and just about anything else that could be stuffed, hammered or screwed into the space. A main part of the process that replaces the crack itself is the stitching pins. Many different concepts have been tried over the years and most have been called metal stitch or metalock. And there is a lot of time and effort involved in the clean-up and machine work of any welded piece. Proper cast iron welding techniques require complete disassembly and oven preheat at 900º F. ![]() Most cause more damage than was present before the attempted weld. Most electric welds with nickel rod on cast iron fail. All electric welding methods for cast iron have proven to be less than satisfactory and in many cases can cause even more cracks. Cast iron is the most difficult of all common cast metals to weld. Why metal stitching? Well, primarily because of the need for an alternative to the difficulties encountered in welding. ![]() Metal stitching or metalocking as it is called in some parts of the world, have become generic phrases that describe methods of repairing cracks in cast metals without welding. I was going to repair about 7" crack in one of my 409 blocks this way I know of one guy that repaired both sides of his 409 block with good results like this any thoughts ![]()
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