If you’ve spent any time building engines or wrenching on heavy machinery, you know the sinking feeling of a stripped thread. It stops a project dead in its tracks. For years, the solution has been a mixed bag of "good enough" fixes—inserts that eventually back out, pull out under torque, or wear out after a few assembly cycles.
If you are tired of mediocre thread repairs that require expensive special tooling and complicated installation processes, it’s time to meet the Race-Sert.
What is a Race-Sert?
Race-Serts are not just another coil or thin-walled insert; they are a permanent thread repair solution designed for high-performance applications. Unlike traditional inserts that just sit in a hole, Race-Serts are technically TAPS.
They are heat-treated and hardened to 62-64RC, making them far harder than standard bolts. Because they are self-tapping, they cut their own threads into the base metal (whether it’s aluminum, cast iron, or steel), creating a zero-gap interference fit. This friction prevents them from ever backing out, even under extreme vibration or thermal expansion.
Why Choose Race-Serts?
Here is why these inserts are gaining traction among top engine builders:
- Permanent Fix with a Lifetime Warranty: The manufacturer guarantees them for the life of the part you repair. No backing out, no pulling out, and no thread wear—ever.
- No Special Tooling Required: Forget about buying a $100 specialized tap and die set for a single repair. Race-Sert kits come with a hardened S7 installation tool. All you need is a drill bit to make the pilot hole and a standard ratchet or impact driver.
- Incredible Speed: You can install a Race-Sert in under a minute with a hand ratchet, or in about 15 seconds with an impact driver.
- Self-Aligning: Because they act as a tap with a built-in guide, they go in straight and true every time.
How to Install Them
The installation process is refreshingly simple:
- Drill out the damaged threads to create your pilot hole.
- Assemble the provided install bolt and apply tapping fluid.
- Seat the insert by tapping it firmly into the hole.
- Drive it in with a ratchet or impact driver until the nut bottoms out.
Where to Buy Race-Serts
You can find a variety of Race-Sert kits at Cylinder Head Supply. They stock several common sizes perfect for cylinder head bolts, mains, and other critical fasteners.
Check out these specific kits:
-
1/4-20 RaceSert Kit (5 Pieces)
Ideal for smaller fasteners and accessory brackets. -
7/16-14 RaceSert Kit (5 Pieces)
A common size for many domestic engine applications. -
1/2-13 RaceSert Kit (5 Pieces)
Perfect for larger heavy-duty repairs.
For other sizes or to browse their full selection of thread repair tools, visit the Crack Detection & Thread Repair section at Cylinder Head Supply.
Final Thoughts
When you are building a race engine or repairing a critical component, you can't afford to second-guess your threads. Race-Serts offer a level of security and permanence that traditional helical inserts simply can't match. They bite into the metal and stay there, letting you torque your bolts with confidence.