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 KEE-n-SERTSTM are Keensert** Type

Key Locking Thread Inserts


Kee-n-sertsTM are Keensert** type key locking threaded  inserts for OEM and thread repair that provide positive mechanical locking into the parent material by means of external "keys" that are knocked down and driven into the host metal.

KEENSERT type inserts have standard ISO Metric, UNC or UNF external threads. This means  that  KEENSERTS  don't  need  any  special  tooling.  They are simply installed using standard  conventional drills and taps.

Keensert miniature threaded sizes  come in sizes from 2mm to 4mm  and in inch sizes from #2 [2 gauge] to #8 [8 gauge]

Keensert Type Miniature Inserts (Kee-n-SertTM brand) Are available in UNC sizes  #2-56;  #4-40;  #6-32  &  #8-32 and in METRIC sizes M2x0.4;  M2.5x0.45;  M3x 0.5  &  M4x0.7.  They can come with either "free running" or "locking" internal threads in most sizes.

Keensert Type Lightweight Inserts (Kee-n-Sert brand) Come in sizes from 5mm to 12mm and #10 to 1/2" UNC and UNF and have a relatively thin wall.

Keensert lightweight style threaded inserts come in sizes 5mm to 12mm and Inch from #10 [10 gauge] to 1/2"

Keensert Type Extra Heavy Duty Inserts (Kee-n-Sert brand) Come in  UNC and UNF sizes from #6- to 1".  They have a thicker wall than "Heavy Duty" but are not available in Metric.

Keensert extra heavy duty thread inserts only com in Inch sizes from #6 [6 gauge] to 1". They are not available in metruc sizes
Keensert heavy duty inserts come in sizes from 4mm to 24mm and in inch sizes from #8 [8 gauge] to 1-1/2"

Keensert Type Heavy Duty Inserts (Kee-n-Sert brand) Come in sizes from 4mm to 24mm and in UNC from #8-32 to 1-1/2" or in UNF from #10-32 to 1".  They have a thicker wall than the Lightweight series.

Keensert Fitting Tool - (Kee-n-SertTM Brand) Keenserts can be fitted by hand using  a hammer as the only tool.  A fitting tool is optional and the main advantage of using it is that it prevents the pins from bending over and misaligning during  the final operation to knock them down into the parent material.


Keensert power fitting tools as well as the manual type illustrated are available. You can even fit Keenserts using only a hammer.

NOTE: Kee-n-SertTM Brand inserts are generally supplied as Industrial Spec. grade but can be supplied in Milspec grade and with Certificates of Conformity on special order.

Click here for VIDEO

How to Install & Remove a Keensert or Key Locking  Thread Insert

How to Fit a KeysertTM

Drill the hole with the specified drill size.

Tap the hole with the correct size standard tap.

Screw the insert in with fingers or a fitting tool till just below the surface.




Tap the locking pins down with a hammer, using a fitting tool if available.

Kee-n-SertTM fitted and in place.



** "Keensert" is a trademark of Alcoa

PO Box 55, KOTARA NSW Australia 2289      PHONE 1 800 025 500          ABN 44564673401


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