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L4 Stitching Pins and Tooling This page shows you the part numbers for L4 pins and their tooling. (Pricing is being updated.) To learn about the capabilities of L4 pins, please review the Stitching Pins page. Important note: Our part numbers reflect a package quantity. Example: If you order L4A-50 you would receive a package of 50 pieces of the L4A 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: Taps: Tooling: Kits: For kits that contain L4 pins, go to the Kits page.
The LNS POWERTAP™ design incorporates shallower flutes for increased strength and for use in power tapping. Made of M-1 tool steel, these taps are for normal tapping conditions in both cast iron and aluminum.
Tough Duty taps are made of CPM-M4 powdered metal technology for abrasion resistance and will stay sharp longer in tougher tapping conditions. And they have the same great flute design as our original POWERTAP™.
We designed this new Tough Duty piloted tap (US Patent number 5,562,371) to help keep the tap aligned to the drilled hole. Improper tap alignment is the number one cause of broken taps. You can do a lot to eliminate that cause with this extra bit of insurance.
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 countersink is optional for L Series stitching pins. Countersinks are used to cut a small tapered recess into the surface of the casting in order to assure that the tapered shoulder of the L Series stitching pin will seat into the surface and is only require when the cast iron is too hard to allow the shoulder of the pin to crush into the surface of the casting. Common applications are on exhaust seats and other machined surfaces. L Series pins require only a very slight countersink for maximum benefit. Use a slow speed drill with all countersinks to improve life of the cutting edges. Countersinking is not done for the purpose of sealing.
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. Tap extractors will work about 25% of the time. It is important to remove any loose pieces before attempting to use a tap extractor. The Drill Guide & Tap Extension Kit will help you with repairs done at angles to the surface such as down in the valve ports of cylinder heads. The 4" long tap extension is designed with the same diameter as the 4" drill guide. This assures that wherever you drill a hole with the drill guide, you will be able to tap the hole at the exact same angle. This kit contains the drill guide and handle, tap extension and six 6" long split point drill bits. 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 time. Use the Quick Change Tap Adapter to reduce the amount of time it takes to change between taps. Insert the drive end of the tap adapter into the power tapper or tee-handle. No more time-consuming repetitive adjustment of the drive collet. Just pop the tap in and out of the Quick Change Tap Adapter.
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