The tool kits listed are the "Internal size". If you are repairing a M12 bolt or stripped thread you will need a M12 kit.

TIME-SERT® is a solid bushing insert. This guarantees easy installation and allows for full load use of tapped hole, ensuring protection against stress and vibration. If you can provide the spark plug number or make, model, year, liter of vehicle we can give you a part number for the kit and insert required. Use form at the right .

You can also get Time-Serts in boxed ranges of tools and inserts

Once the insert is seated, reverse rotation of the tap handle to remove the installation tool driver from the installed Time-Sert. Because the external thread diameter and pitch is determined by the dimensions of the internal thread of the insert, the resulting external thread does not correspond with a standard tap size. The bolts on this print out will probably not look like your bolt or drain plug, that's not a problem as we are only looking

expressly retains the right to make changes or discontinue any product it manufactures or sells at any time and without notice.

How do Big-Serts work?

Yes, if the threads in the base material are not damaged a new TIME-SERT can be re-inserted into that hole. This is a common practice on CNC pallet changers. When an insert starts to show wear over time, the insert can be removed with a screw extractor then replaced with a new one. The problem that can happen is the reamer did not ream all the way thru the hole so it leaves a step in the hole that will STOP the tap because the 45 degree counterbore was not fully done. This can happen because of 2 possible things. The reamer is hitting a VALVE or the top of the PISTON which is stopping it from entering all the way. If multiple inserts need to be installed this can also be done using a CNC with a tapmatic reversing head.

Würth offers you several thousand variations in our range of professional tools to meet all the requirements of your business. For more than 50 years, we have been developing state-of-the-art professional tools which are synonymous with innovation and quality. Mechanics, carpenters, landscapers, plumbers and many more professions can increase their productivity and meet the needs of your customers with our range of high-quality professional hand tools.‎ The tool kits listed are the "Internal size". Metric Example: If your bolt is M6x1.0 and your stripped thread is M6x1.0 you will need a M6x1.0 thread repair kit. Inch Example: If your bolt is 3/8-16 and your stripped thread is 3/8-16 you will need a 3/8-16 thread repair kit. Yes Spark plug repair can be done without removing the head by placing a heavy grease on the step tap flutes to catch the chips. TIP: mechanics have mentioned that using a shop vac with a plastic tube taped to the nozzle end works well for removing any stray chips left over.Apply oil to the insert driver to help lubricate it and to minimize the chance of galling the threads of the insert during installation. Why does the NorthStar2000 p/n J-42385-2000 and the NorthStar BIG-SERT p/n J-42385-500BS have 2 lines on the tooling? When the NorthStar J-423385-500 kit only has one. Ford spark plug Repair kit p/n 5553 to repair blown out sparkplug's. Ford Triton Sparkplug repair kit includes all the tools and 5 inserts.