Lisle Plugs and Gaskets Repair Kit — 5-Pc Oversize Thread Plugs for 13–19mm Idler Pulleys, for Tool 58850

Lisle 58650 is a five-piece plugs and gaskets repair set designed to remove damaged threads and tap new oversize threads to restore a leak-free gasket surface.

This compact kit provides the essential replacement plugs and gaskets used with Lisle’s thread-restoration tooling to fix stripped or damaged idler pulley mounting holes. Instead of replacing housings or pulleys, the 58650 set lets technicians re-establish a clean, perpendicular thread that seats gaskets properly, reducing oil or fluid seepage. The parts are intended as replacement components for Lisle tool 58850 and fit a broad range of hex and square-drive requirements encountered in automotive service.

How does the Lisle 58650 set restore damaged threads?

The set supplies hardened plugs and matching gaskets that work with Lisle’s tapping fixture to remove stripped threads and install a slightly larger, secure replacement thread. The process recreates a full-depth thread that accepts the plug so the gasket can seal against a true, perpendicular surface.

• Includes five plugs and gaskets sized for oversize thread repair
• Designed to be used with Lisle tapping tool 58850 for guided cutting
• Restores thread engagement and allows a proper gasket seat

What sizes and fastener types does this set support?

The kit is compatible with the range of hex and square-drive sizes commonly found on idler pulleys and mounting bosses. It covers multiple hex dimensions plus both common square drive adapters, so it integrates into existing shop toolsets without extra adapters.

• Works with idler pulleys requiring 13mm–19mm hex sizes
• Supports 3/8" and 1/2" square drive tool interfaces
• Simplifies repairs across different vehicle makes and pulley types

Why does the tapping method matter for gasket sealing?

Accurate thread alignment is critical for a gasket to compress evenly and form a reliable seal. The Lisle tapping approach keeps the new thread perpendicular to the gasket surface, minimizing the risk of warped or uneven seating that leads to slow leaks.

• Tapping tool maintains perpendicular thread orientation to the mating surface
• Prevents angled threads that cause uneven gasket compression
• Helps avoid repeated rehousing or component replacement

Is the 58650 set compatible with other Lisle tools and where is it used?

The 58650 parts are intended as replacement consumables for Lisle tool 58850 and are broadly applicable in engine accessory and pulley maintenance work. Use them wherever stripped pulley or housing threads need an oversize threaded plug and a reliable gasket seal.

• Replacement components for Lisle tool 58850
• Commonly used on idler pulley mounts and accessory housings
• Ideal for in-shop repairs, fleet maintenance, and automotive technicians

Who is this for: The Lisle 58650 5 Pc. Plugs and Gaskets Set is built for professional mechanics, automotive technicians, and experienced DIYers who want a cost-effective way to repair stripped threads on idler pulleys and accessory mounts. If you already own Lisle tool 58850 or frequently encounter damaged mounting threads, this set supplies the replacement parts needed to complete repairs cleanly and restore proper gasket sealing without replacing the entire component.