C4 Stitching Pins and Tooling
This page shows you the part numbers for C4
pins and their tooling. (Pricing is being updated.) To learn about the capabilities of C4 pins, please
review the Stitching Pins page.
(If you are from outside the US, please contact us. We ship direct to the US but have stocking distributors in other countries.)
Kits: For kits that contain C4 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. C3 and C4 pins use three tap styles: Roughing, Finishing and Bottoming. Roughing is first, then Finishing and the Bottoming is used for blind holes. The Bottoming taps will be at the bottom of the hole when they start to tighten.
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.)
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