One pin in 0.750" cast iron creates 1300 pounds of holding power. Installation with a hand held drill and pneumatic tapping tool are easy with this pin. Cracks in large stationary engines, compressors, metal working machinery and other large castings are repaired with C3 pins. They are used in many industrial repairs where high strength and high pressure seal are required. C3 pins require 0.500" minimum wall thickness for installation. Tap drill=0.201" Pins per inch of repair=6 Thread diameter=0.233" Shoulder diameter=0.280" Cracks on inside or outside corners, cracks into bolt holes, core plug holes, inspection holes, pipe thread holes and many other areas where strength must be replaced can be repaired with these pins. C2F pins are used in structural repairs or when no spreading pressure is acceptable. The finer thread gives better tap life also. This change allows for installation in thinner material (0.200") and provides more strength (300 pounds in 0.250" cast iron per pin). The C2F pins with their fine threads have replaced the C2 coarse thread pins originally introduced in 1993. C2F and L6 also share a lot of other tooling. Both the C2F and L6 stitching pins use a tap drill size of wire 7. The C2F stitching pins are made of both steel and aluminum. Tap drill=0.136" Pins per inch of repair=5 Thread diameter=0.165" Shoulder diameter=0.215" It can be helpful to leave about 0.040" of shoulder above the surface to add strength to thin material repairs when possible. In 0.125" material, one pin will create 130 pounds of holding power. This tiny pin is used mostly in thin walls as thin as 0.125" and in tight spots. This is our smallest CASTMASTERâ„¢ stitching pin. C1 and L4 also share a lot of other tooling. Both the C1 and L4 stitching pins use a tap drill size of wire 29. The C1 stitching pins are made of both steel and aluminum. Tap drill=0.290" Pins per inch of repair=4 Thread diameter=0.326" Shoulder diameter=0.348" The L8 pins are often used to plug holes or when a larger pin than L6 is needed. Applications include large diesel heads, blocks and other industrial castings. These pins create significant spreading pressure when tightened. The L8 pins are the largest in the L Series group. Tap drill=0.201" Pins per inch of repair=5 Thread diameter=0.248" Shoulder diameter=0.268" L6 pins generate more spreading pressure than the smaller pins in this series. Simple freeze cracks on engine blocks where the crack length is less than 4" and cracks that are not on inside or outside corners are often repaired with L6 pins. Most automotive cylinder heads with cracks in the seat area can be repaired with L6 pins. The L6 pins are very popular in many applications where only sealing a crack is required. L6 and C2F also share a lot of other tooling. Both the L6 and C2F stitching pins use a tap drill size of wire 7. The L6 stitching pins are made of both steel and aluminum. Tap drill=0.136" Pins per inch of repair=7 Thread diameter=0.170" Shoulder diameter=0.185" These pins create a small amount of spreading pressure. Because of their extra fine standard threads, you can tap threads for L4 pins into the side of hard seat inserts and in between seats. Cracks in aluminum cylinder heads are usually repaired with the L4 aluminum pins. The L4 pins are used in thin walls, tight spots, hardened cast iron and many applications where their small size is helpful. L4 and C1 also share a lot of other tooling. Both the L4 and C1 stitching pins use a tap drill size of wire 29. The L4 stitching pins are made of both steel and aluminum. Read more about the C-series: C1, C2F, C3 and C4 Stitching Pins. Read more about the L-series: L4, L6 and L8 Stitching Pins. Sealing leaks and re-creating strength is very cost effective and reliable. Cylinder head repair to automotive and large industrial cylinder heads is a very large market for us. These special stitching pins are used daily by hundreds of repair technicians around the world to perform engine block crack repairs and cylinder head crack repairs. Lock-N-Stitch Inc.in Turlock California manufacture over 30 different stitching pins. There are two distinct types of stitching pins: L-series and C-series. They come in several diameters and thread lengths. To learn about each pin's capabilities, please review our stitching pin page where you will find information about the different thread styles.
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