Preset 1/2 inch 20 UNF

[RKdch]

Hello,
I can not find 1/2 inch 20 UNF anymore. Is that perhaps missing?
Thank you

[mwganson]

In the ThreadProfile menu open the online calculator. There you can find the custom settings needed.

Bolts (external)
1/2-20 UNF-2A
PITCH Ø.4662-.4619
MINOR Ø.4446 MAX

Nuts (internal)
1/2-20 UNF-2B
MINOR Ø.457-.446
PITCH Ø.4731-.4675

Those would be in inches, so you might need to convert to mm possible.

I never removed 1/2 - 20, but others have submitted PR's and possibly one of them might have removed it, but I didn't catch if it they did. Or maybe (probably) it was never in there before.

[RKdch]

Hello,
Thank you for the quick reply.
I was able to print something with the data. But it will not really fit well.
In 2020 - 2022 I printed it a few times. There it was to be found in the presets.
Is it not possible that it will be reinstalled? Or can I still get the old version somewhere?

Thank you

[mwganson]

It's too tight or too loose? If you can experiment with the minor diameter (slightly larger for the nut if it's too tight, for example), and then let me know what gives you the right fit, I can add it to the presets and use those values.

[mwganson]

I forgot there is also a Tolerance property you can use to either tighten or loosen the fit.

[RKdch]

I was quite busy these days. But now, on the weekend, I think I can try again.
It was to tight. But not in diameter, I think. But at intervals between thread turns. They seem to be a little too far apart.
I hope you understand what I mean. This conversation is far too advanced for the school English I learned a long time ago. I (have to) use a translator.
The second entry (tolerance): I understand the sentence, but I can not find where I can change anything on the thread.

[RKdch]

That is how I get it usable.

Bolts (external)
1/2-20 UNF-2A
MAJOR Ø.4662-.4619 = 11,7856 = 11,8 mm
MINOR Ø.4446 MAX = 11,2928 = 11,3 mm
Pitch 1,27mm

But it was better in the old version. Easier to turn.

The nuts can be made directly in Part Design. They will be perfect.

[mwganson]

I've examined the source code. Recently I accepted a PR that calculates these parameters based on the given nominal diameter and pitch rather than hard coding the minor diameter and pitch. That must be where the 1/2-20 got replaced accidentally with the 1/2-13 for the fine thread option. I'll add 1/2-20, but this will be calculated rather than using your values. Hopefully, they'll work okay. This version will be 1.98 once I've made these changes shortly.

[RKdch]

Hello,   Thanks, it's working again now.     Gesendet: Donnerstag, 4. Dezember 2025 um 20:38 Von: "Mark Ganson <TheMarkster>" ***@***.***> An: mwganson/ThreadProfile ***@***.***> CC: RKdch ***@***.***>,Author ***@***.***> Betreff: Re: [mwganson/ThreadProfile] Preset 1/2 inch 20 UNF (Issue #77) mwganson left a comment (mwganson/ThreadProfile#77) I've examined the source code. Recently I accepted a PR that calculates these parameters based on the given nominal diameter and pitch rather than hard coding the minor diameter and pitch. That must be where the 1/2-20 got replaced accidentally with the 1/2-13 for the fine thread option. I'll add 1/2-20, but this will be calculated rather than using your values. Hopefully, they'll work okay. This version will be 1.98 once I've made these changes shortly. —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you authored the thread.Message ID: ***@***.***>