You can support my work by downloading here as well, thank you:
https://makerworld.com/en/models/205335

This collection consists of 3 types of bolt.
Hex bolts
Allen sockets bolts
Allen countersunk bolts

All bolts are in following sizes:

sizes:
m10x5
m10x8
m10x10
m10x12
m10x15
and by 5mm steps to 120mm

All models are exported with tight tolerances.

It is neccessary to adjust X/Y hole compensation for nuts according to your printer capabilities.
The bigger the bolt the bigger the tolerances

All allen sockets have 0.15mm play. In case you need a slightly larger socket just print the bolt with adjusted X/Y hole compensation.

There is a lot of files so I uploaded them as zip files.
But all types of bolts and nuts are shown on the picture.

For best results and maximum strenght use layer heigh between 0.12-0.16mm.