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Tap size for heater block?  

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Magik
(@magik)
Active Member
Tap size for heater block?

When I tried to change nozzles the new one was not screwing in smoothly. I can’t see any residue inside but if someone knows what tap size to use I can try and clean it out. Has anyone had a similar issue?

TIA!

Posted : 02/04/2026 5:15 pm
Cary
 Cary
(@cary-2)
Eminent Member
RE: Tap size for heater block?

M6-1.0mm

Posted : 02/04/2026 5:29 pm
Magik
(@magik)
Active Member
Topic starter answered:
RE: Tap size for heater block?

So M6 and I assume the 1.0MM is the thread pitch?

Posted : 02/04/2026 6:20 pm
hyiger
(@hyiger)
Famed Member
RE: Tap size for heater block?

 

Posted by: @magik

When I tried to change nozzles the new one was not screwing in smoothly. I can’t see any residue inside but if someone knows what tap size to use I can try and clean it out. Has anyone had a similar issue?

TIA!

They are pretty cheap on Amazon or AliExpress. 2pcs Aluminum Block Hotend Heaterblock I would just get a new one. 

Posted : 02/04/2026 6:21 pm
1 people liked
Cary
 Cary
(@cary-2)
Eminent Member
RE: Tap size for heater block?

Yes m6 with a pitch of 1mm.  

Posted : 02/04/2026 6:26 pm
Magik
(@magik)
Active Member
Topic starter answered:
RE: Tap size for heater block?

So this one looks like it should work? Thanks for the help btw!!

Posted : 02/04/2026 6:50 pm
Cary
 Cary
(@cary-2)
Eminent Member
RE: Tap size for heater block?

looks good

Posted : 02/04/2026 7:09 pm
hyiger
(@hyiger)
Famed Member
RE:

 

Posted by: @magik

So this one looks like it should work? Thanks for the help btw!!

It's your prerogative of course, but wouldn't replacing the heat block be a better (and cheaper) alternative than retapping what already looks pretty beaten up? 

Posted : 02/04/2026 7:29 pm
1 people liked
Sembazuru
(@sembazuru)
Noble Member
RE: Tap size for heater block?

Chasing threads on a soft metal like Aluminum is really easy to accidentally cross-thread or cut new threads between the existing threads. Be careful, and ready to just buy a new heater block.

Notice, though, two aluminum heater blocks are the same price as the drill bit and tap set you found so it might not make financial sense.

See my (limited) designs on:
Printables - https://www.printables.com/@Sembazuru
Thingiverse - https://www.thingiverse.com/Sembazuru/designs

Posted : 03/04/2026 3:26 am
Geoff Steele
(@geoff-steele)
Trusted Member
RE: Tap size for heater block?

I have tapped one out, after messing the thread up in a nozzle swap but before the tap I ordered arrived I found I corrected the thread problem by screwing my nozzle in from the wrong side. The nozzle tapped the thread out and that worked surprisingly well.

I did eventually use the tap, and have since bought a spare with a nozzle and use that one now. That original heater block still is fine and sits as a ready spare.

Posted : 03/04/2026 3:29 am
1 people liked
hyiger
(@hyiger)
Famed Member
RE: Tap size for heater block?

I use $130 Diamondbacks and I'll happily throw away a heat block rather than risk screwing up the threads on the nozzle (even though it's hardened steel). I also use a small amount of HT thermal paste on the threads that acts as thread lubricant as well. 

Posted : 03/04/2026 3:37 pm
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