Built a browser-based fastener generator — would love feedback on accuracy

I’ve been working on a browser-based CAD tool where you can generate parts like bolts and fasteners and tweak things like pitch and diameter in real time. I just got the first version of the fastener generator to a usable point and I’m trying to dial in the thread geometry and overall accuracy.

It’s part of a bigger project I’m building with more parametric tools and eventually a marketplace, but this is one of the first things that’s actually usable.

Would appreciate any feedback — if anything looks off or if there’s something you’d want added.

Here’s the link: machcad.org