FAQ
Frequently Asked Questions
Do I need to tap to install a C-Sert?
No. C-Serts are self-tapping.
Do I need a thread locker?
No. C-Serts cut their way in. They make a tight interference fit. So any thread locker would just get squeezed out as the C-Sert bores in.
What keeps C-Serts in place?
Friction, pure and simple. The C-Sert’s external tapping threads produce more friction than the fastener’s torque rating.
Can I remove a C-Sert?
Yes, you can. Just use the same hex installer, but turn it clockwise.
If I remove a C-Sert, can I use it to repair another damaged hole?
Yes, you can. C-Serts are taps and can be reused, just like a tap.
Why do C-Serts have left handed external threads?
If you use an impact wrench to remove a stuck bolt from a C-Sert, the L-H external threads prevent the C-Sert from backing out with the bolt.
Can I use an impact to install C-Serts?
No. Use a ratchet or, for larger sizes, a torque multiplier.
In what types of metal can C-Serts be inserted?
In mild steel, high carbon steel, alloy steels (like 4130), cast iron; in aluminum and magnesium; in copper, brass and bronze. They also work in 400 Series stainless, but not well in 300 Series stainless.
Can I install C-Serts in hardened steels?
Yes, but only up to around 34RC.
Can C-Serts be installed in through holes?
Yes. But most applications are in blind holes.
When I install a C-Sert, can I use the same size bolt as before?
Yes. The fastener size remains the same.
Can C-Serts withstand high temperatures?
Yes. They won’t loosen, but they lose some of their hardness at over 1100 degrees Fahrenheit (base metal temperature, not ambient temperature).
What are C-Serts made from?
From S-7 high-impact tool steel, through-hardened to 56RC. Our C-Sert Mini’s are made from 8620 gear steel, case hardened to 62RC.
When I buy C-Serts, what comes with them?
An installer, cutting fluid, and instructions. And, at your option, a drill bit (for C-Serts up to 1” and 24mm). For opening up large C-Serts’ pilot holes, another option we offer is annular cutters.
Where are C-Serts made?
Los Angeles, California, USA.