C-Sert
Lifetime Warranty. Quick Installation.
C-Sert Manufacturing warrants repairs made with C-Sert products for the lifetime of your equipment. This warranty provides for full product replacement and freight, at no charge to our customers.
What is covered:
Thread failure: due to stripping, nicking, general wear, and all other mechanical causes, excluding only corrosion.
Mechanical failure: due to pull-out and back-out (including vibration).
“WHY DON’T C-SERTS WEAR OUT?” C-Sert threads are hardened tool steel, far harder and tougher than all classes of fasteners. Compared with C-Serts, bolts are as soft as butter. So, no thread wear. Ever.
“WHY DON’T C-SERTS BACK OUT?” Two reasons: 1) They cut their way into the base metal. The friction created by this “interference fit” keeps them in place. 2) C-Serts’ external cutting threads are left-handed. When you remove a bolt, those left-handed threads stay put, or even tighten up a bit.
“WHY DON’T C-SERTS PULL OUT?” Two reasons: 1) C-Serts wedge deep into the base metal as they cut – high “engagement.” 2) The cutting threads are ACME type, with massive flat crests, far stouter than the typical weak sharp crests found on brands X, Y, and Z.
“WON’T A BAD BOLT DAMAGE C-SERTS?” No. All C-Serts contain a built-in die to true up damaged or defective fasteners. That’s yet another reason we can offer our Lifetime Warranty.
SPECIFICATIONS
Insert type: self-tapping
Means of securing: interference fit
Guide: integral pilot
Guide clearance: .003-.004 under pilot hole diameter
Integral die: 3 to 6 cutting surfaces depending on diameter
Internal threads: Inch: Class 2B, Metric: Class 6H
External thread type: left-handed
External thread profile: ACME
Metallurgy: S-7 tool steel
Hardness: 56 RC
Heat treat: through-hardened
Tempering: double draw
All C-Serts are self-tapping and self-aligning, with an integral die for truing up damaged or defective fasteners, left-handed external engagement threads, and a Life-time warranty against failure and thread wear.
How C-Serts Work
Integral Pilot
C-Serts are TAPS – they cut their way in. The integral pilot ensures they start straight. It’s just .003 – .004 smaller than the hole you have opened up.
Left-Handed Engagement Threads
If you need to remove a stuck bolt from a C-Sert, the L-H external threads prevent the C-Sert from backing out with the bolt.
Thread-Chasing Die Slots
The slots drive the C-Serts. They also clean up any damaged or defective bolt that gets used by mistake.
Acme Profile Threads
The ACME profile is far stouter than ordinary sharp crested threads. It prevents thread failure and pull-out.
Chip Relief, Lands & Flutes
Just like a standard tap, C-Serts have chip relief to reduce tool pressure, lands to support the tapping teeth, and flutes to clear chips.
Tapping Slots & Teeth
This is classic tap geometry – cutting teeth, chip relief, lands and flutes. As chips form, they curl into the C-Sert’s hollow center for removal later.
Installation Instructions
Step 1
Drill out the damaged threads to the diameter shown on the C-Sert packaging, and slightly deeper than the length of the C-Sert.
Step 2
Drill out the damaged threads to the diameter shown on the C-Sert packaging, and slightly deeper than the length of the C-Sert.
Step 3
Put the C-Sert into the hole.
Step 4
Give the hex-head installer 4 or 5 solid hits to seat the C-Sert fully in the pilot hole. Use a long-handled ratchet to turn the C-Sert COUNTER CLOCKWISE. Keep the ratchet horizontal, and put some downward pressure on the ratchet head. For large C-Sert sizes (7/8? and 20mm and larger) use a torque multiplier.
Step 5
Once the top of the C-Sert is flush with the surface (or a bit below, if you prefer) remove the installer, break up the chips inside the C-Sert, and blow them out.