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C3 Stitching Pins and Tooling This page shows you the part numbers for C3 pins and their tooling. (Pricing is being updated.) To learn about the capabilities of C3 pins, please review the Stitching Pins page. Important note: Our part numbers reflect a package quantity. Example: If you order C3B-25 you would receive a package of 25 pieces of the C3B stitching pin. (If you are from outside the US, please contact us. We ship direct to the US but have stocking distributors in other countries.) Stitching pins: Tooling: Kits: For kits that contain C3 pins, go to the Kits page.
Power tapping (see L02550) with C Series taps will produce the best threads and increase the life of your taps.
Tough Duty drill bits are made of high quality tool steel and heat-treated to higher hardness. These drill bits will hold an edge longer and will stand up to harder material. Use our Tough Duty drill bits if your standard bits have difficulty drilling and staying sharp in your applications.
AccuSize™ drill bits prevent oversizing and egg-shaping drilled holes. Having a good, round and accurate-sized hole is essential to making a good repair. Standard drill bits usually drill oversized and out-of-round holes when drilled by hand. AccuSize™ drill bits also stay sharp longer and drill cast iron faster than any other split point high speed steel drill bit. Our AccuSize™ drill bits are patent pending.
A spotfacer is required for C Series pins installed into through holes. Spotfacers cut a recess into the surface of the casting to accept part of the shoulder of the pins. Some of the shoulder must remain below the surface after it is ground or machined flat. The shoulder is what holds the Spiralhook™ threads tight. Spotfacers cut an angle into the surface that matches the negative angle under the shoulder of the corresponding pin. This creates additional holding power. Approximately 50% of the shoulder should be below the surface whenever possible. However, in very thin material keep the spotface shallow to leave as much room for threads as possible. Approximately 0.020" should serve as a minimum for spotface depth. If an invisible repair is not an issue, you can leave approximately 50% of the shoulder protruding above the surface of the completed repair for additional strength. Use a slow speed drill with all spotfacers to improve life of the cutting edges. (Note: C Series pins can be installed into blind holes without embedding the shoulder into the surface. When the pin hits the bottom of a blind hole, the threads are locked into place.)
LNS drill stops are used to control the depth of the lock hole patterns and for controlling the depth of the drill hole when installing the stitching pins in blind holes. The depth of the countersink is equally important. L Series pins require only a very slight countersink for maximum benefit; control the depth by using the drill stop. By allowing the drill bit/countersink to only penetrate to a predetermined depth, many common drilling errors can be avoided. A Pin Spacing Drill Jig is used
to create the best spacing for the pins. The drill jig is most often used
on cracks longer than one inch. It helps you drill holes on semi-flat to
flat surfaces in a three-step method more quickly than installing pins one at a
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