Helicoil Insert

[DBrach]

Hi All

I have 4-40 ss. helical insert, what size hole on my part should I make it to?

Thanks

 

[hydtools]

Insert Size Drill Size Wire Thread Insert Length
4-40 3.0 mm 0.112

Ted

 

[rb1957]

Surely this is available in the Helicoil catalogue ?

another day in paradise, or is paradise one day closer ?

 

[FACS]

Helical Inserts (Heli-Coils) are threaded in place.
You do not use just a hole.

You drill out the hole
You thread the hole
You screw in the Heli-Coil

 

[ctopher]

rb1957 is correct, it should be in the catalogue.
A quick Google search comes up with charts.

http://www.noblefix.com/helicoil/HeliCoil-Drill-Chart.html

ctopher, CSWP
SolidWorks '17
ctophers home
SolidWorks Legion

 

[DBrach]

Thanks Ted, for the reply

When I put helicoil in the #4-40, how does that fit in the #4-40 hole, it's way bigger. I don't understand. Please see pic attached.

Thank you

 

[rb1957]

please, read the Helicoil manual. I thought helicoils were sized for the screw you'd be installing. But the parent hole in the plate, before you tap it, is bigger. The screw fits the ID of the helicoil which fits into a larger tapped hole.

Since you obviously have a model of the helicoil, what does that tell you ?

another day in paradise, or is paradise one day closer ?

 

[FACS]

 

[drawoh]

DBrach,

There is a special tap for 4-40UNC helical thread inserts. The manufacturer's literature will tell you what size tap drill to use.

--
JHG

 

[DBrach]

Thanks all for the comments

 

[mfgenggear]

As said before
Drill
Tap will be larger
Use the special thread gages
Go no go
Simple