Loading…
Manufacturing services
Short answer
Select it when you configure your part and detail it on your drawing: The designation and depth of each thread, and the part number of each insert.
PREMSA Industries team
2 min read
Updated: September 29, 2026
Category: Tolerances & quality
A hole in the 3D model does not say whether it is threaded. That is why, when you configure your part, you indicate whether it has threads or inserts and detail them on your drawing.
In your model, draw the holes without the thread. On the drawing, call out the full designation of each thread (for example, M6×1.0 or 1/4-20 UNC), its depth if the hole is blind and its class if your application requires it. Unless specified otherwise, we machine threads to class 6H/6g for metric or 2B/2A for unified, and inspect them with calibrated instruments.
If your part has threaded, press-fit or heat-set inserts, dowel pins or any installed hardware, call out on the drawing the manufacturer's part number, the face where it goes and its depth.
Parts with threads or inserts may go to engineering review before the price is confirmed. If we find any detail to clarify, we contact you before manufacturing.
To choose the hole for each thread, see our tap drill size chart and our drill and tap calculator.
Keep reading
Tolerances & quality
1 min readIt's the document in which PREMSA states in writing that your parts meet your drawing, your order and the specifications you requested. We issue it, signed, with every order, and you receive it with your shipment and in the portal.
Tolerances & quality
2 min readEmail ventas@premsaindustries.com or call +52 81 2634 1113. We log your complaint with a reference number, investigate it against your order's records and reply in writing with the cause and what we'll do. We don't close it until we've replied to you.
Tolerances & quality
2 min readFirst, email us to request a return authorization number (RMA): no part is accepted without one. We review your case and, if we need the parts, we give you the RMA and shipping instructions. When the return is due to our error, we pay for the return shipping.
Upload it and we’ll make it real. One part or a thousand.