Carbide boring tip ID

This topic has 9 replies, 7 voices, and was last updated 18 January 2026 at 10:04 by Wade Beatty.

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17 January 2026 at 14:50 #832915
Les Riley
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@lesriley75593
I have a box of these tips. They look very useful but they have a strange mounting arrangement that makes it difficult to use without the correct holder. The shank is an unequal oval shape. I thought about cutting off the large portion and just using the thin bit but that is not regular either.

Overall about 40mm long.

I assume they are for boring small holes but am by no means certain.

Does anyone recognise them or know anything about such tips please?
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17 January 2026 at 14:55 #832917
JasonB
Moderator
@jasonb
They are made by P H Horn although a few other makers use the same teardrop style shank. Holders are available but not cheap

For hobby use use can make a simple holder with grub screws to push them against the side of a plain round hole.

I have another form of shank on some of mine and that is all I do.

https://www.1st-tooling.co.uk/Horn-Mini-Boring-Bar-Holder
17 January 2026 at 15:17 #832918
Les Riley
Participant
@lesriley75593
Thanks Jason,

Having now seen a holder, I might be tempted to make something up. I can CNC the hole if I am careful.

Looked on ebay – yes, they are not cheap!
17 January 2026 at 16:09 #832919
bernard towers
Participant
@bernardtowers37738
Did mine about 20 years ago by drilling the large dia hole and using a small slot drill for the minor one and cleaned up by broaching with a broken tool. Use a grub screw to hold location.
17 January 2026 at 16:40 #832925
jimmy b
Participant
@jimmyb
I made a couple of holders for this type of insert years ago as I ended up with a box of used ones. All types of threading, boring and grooving tips.

From memory, I think i just drilled 2 holes for clearance and milled the location angle.

Jimb
17 January 2026 at 17:33 #832942
DC31k
Participant
@dc31k
On 17 January 2026 at 16:09 bernard towers Said:

Did mine about 20 years ago by drilling the large dia hole and using a small slot drill for the minor one

Another option is to drill the small hole, plug it back up with a cylinder of the same material and loctite. Then drill the larger one. Heat up to break the loctite.

A long-winded way would be to fabricate it from two halves and make the thin end pointed (vee rather than oval).
17 January 2026 at 20:23 #832979
Wade Beatty
Participant
@wadebeatty78296
From a German forum, quite a bit on the Horn tool holders. I have hundreds that I purchased at auction and use them often. Easy to break if fed to deep, ask me how I know.

https://forum.zerspanungsbude.net/viewtopic.php?f=59&t=44478
17 January 2026 at 21:11 #832987
Mark Rand
Participant
@markrand96270
On 17 January 2026 at 14:55 JasonB Said:

They are made by P H Horn although a few other makers use the same teardrop style shank. Holders are available but not cheap

For hobby use use can make a simple holder with grub screws to push them against the side of a plain round hole.

I have another form of shank on some of mine and that is all I do.

https://www.1st-tooling.co.uk/Horn-Mini-Boring-Bar-Holder

That price looks quite reasonable if one has a few tools to go with the holder.
18 January 2026 at 09:50 #833015
Les Riley
Participant
@lesriley75593
That’s a useful link, thanks.

I can’t read German but the drawings tell me all the dimension I need!
18 January 2026 at 10:04 #833023
Wade Beatty
Participant
@wadebeatty78296
Depending on your browser you can click on the top right drop down menu and use the translate option…after that it is automatic on that site.
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