ISO 2768 for the following: Linear Dimensions, External Radius and Chamfer Heights, Straightness and Flatness, Perpendicularity, Symmetry, Runout. Dowel Pin Installation Tolerances. Slip & Press fit design tolerances for ANSI size dowel pins. Hex Head Bolt Installation & Design Tolerances. Hole - Fastener Fits for ANSI.

1. Iso 2768 Hole Tolerance For Slipcovers

Hello! This is the swedish engineerling speaking. For one of my own projects I'm looking into ordering som turned aluminium parts from china or wherever its the cheapest really. This would be first time I go from idea to ordering parts for a personal project, so I'm of course looking to learn as much as possible.

Iso 2768 Hole Tolerance For Slipcovers

This is the part if you are interested. 30mm long.

What would be a reasonable tolerance for this? It has internal M3 threading. Is +- 0.1mm to loose? Would +-0.05mm better?

In general, what are reasonable tolerances if you send your drawings off to be milled/turned (CNC).

Whats good if the part only connects to other parts with standard thread?

What good if it need to fit together snuggly with multiple other parts?

Thanks!

EDIT: Since all you are so helpful I thought I make it a bit easier to understand where I am going with this. The complete assembly is now uploaded to grabcad. It's not very complicated... The center piece is a wooden rod. The only place where I actually need some precision i s the threads connecting the socket to the 3mm steel rod at the end.