To learn about our two thread styles of stitching pins, please read L Series and C Series. To learn about each pin's capabilities, please review this stitching pin page where you will find information about each of the different diameters and thread styles. To see part number and pricing for a particular pin, click on the link located above its description.
The L4 stitching pins are made of both steel and
aluminum. Both the L4 and C1
stitching pins use a tap drill size of wire 29. L4 and C1 also share a lot
of other tooling. The L4 pins are used in thin walls, tight spots,
hardened cast iron and many applications where their small size is
helpful. Cracks in aluminum cylinder heads are usually repaired with the
L4 aluminum pins. 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.
These pins create a small amount of spreading pressure.
The L6 stitching pins are made of both steel and
aluminum. Both the L6 and C2F
stitching pins use a tap drill size of wire 7. L6 and C2F also share a lot
of other tooling. The L6 pins are very popular in many applications where
only sealing a crack is required. Most automotive cylinder heads with
cracks in the seat area can be repaired with L6 pins. 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.
L6 pins generate more spreading pressure than the smaller pins in this series.
The L8 stitching pins are made of steel.
The L8 pins use a
letter L tap drill. The L8 pins are the largest in the L Series
group. These pins create significant spreading pressure when
tightened. Applications include large diesel heads, blocks and other
industrial castings. The L8 pins are often used to plug holes or when a
larger pin than L6 is needed.
The C1 stitching pins are made of both steel and
aluminum. Both the C1 and L4 stitching pins use a tap drill size of wire 29.
C1 and L4 also share a lot
of other tooling. This is our smallest CASTMASTERô stitching pin.
This tiny pin is used mostly in thin walls as thin as 0.125" and in tight
spots. In 0.125" material, one pin will create 130 pounds of holding
power. It can be helpful to leave about 0.040" of shoulder above the
surface to add strength to thin material repairs when possible.
The C2F stitching pins are made of both steel
and aluminum. Both the C2F and L6 stitching pins use a tap drill size of
wire 7. C2F and L6 also share a lot of other tooling. The C2F pins
with their fine threads have replaced the C2 coarse thread pins originally
introduced in 1993. This change allows for installation in thinner
material (0.200") and provides more strength (300 pounds in 0.250"
cast iron per pin). The finer thread gives better tap life also. C2F
pins are used in structural repairs or when no spreading pressure is
acceptable. 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.
The C3 stitching pins are made of steel.
The C3 pins use a letter O tap drill. C3 pins require 0.500" minimum
wall thickness for installation. They are used in many industrial repairs
where high strength and high pressure seal are required. Cracks in large
stationary engines, compressors, metal working machinery and other large
castings are repaired with C3 pins. Installation with a hand held drill
and pneumatic tapping tool are easy with this pin. One pin in 0.750"
cast iron creates 1300 pounds of holding power.
The C4 stitching pins are made of steel.
The C4 pins use a 1/2" tap drill. This is currently our largest
CASTMASTERô stitching pins. It is easier and quicker to install this pin
by drilling and tapping by machine rather than hand held tools. One inch of wall
thickness is required for C4 pins. A single pin in 1" of cast iron
develops 2000 pounds of holding power.
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