I'm determined to prevent another crash (due to the same issue). None of my equipment came with installation sheets when I bought my bike last year. I did some on-line research on my handlebar stem on the manufacturer's website. That's the best place to find support and technical information.
I found the 2-bolt stem instructions on the VisionTechUSA website. I looked at my stem to verify the information. As indicated in the instructions, the information I needed to know was located on the stem itself. From the image below, this includes 1) an unknown number, 2) angle, 3) length, and 4) torque specifications and handlebar size. In my case these data are; 0610, 10-degrees, 70mm, and 12Nm and 26mm, respectively. The stem handlebar clamp bolts are 5mm hex.
|Stem technical data markings|
|Stem angle (10-degrees) and length (70mm) data|
|Stem handlebar torque (12Nm) and center diameter (26mm) data|
|2-bolt stem (5mm)|
Disclaimer: Please refer to the manufacturer's documentation before attempting any bike maintenance or, better yet, use the services of a trained professional bike mechanic.