This question was sent to me via our free Personal Gear Guru service by Cesar B., asking about rigging a Nikon SB-900 flash using the included plastic stand.
Q: CESAR B.
What size of a hex stud for a stand of a Nikon SB-900 flash, please?
A: GEAR GURU
In addition to the the Hex Stud, a lot of people choose the Tilting Umbrella Adapter with KG000912 & KG001112 studs, http://www.kupogrip.com/tilting-umbrella-adapter-studs
/. This gives you the ability to angle your flash and use an umbrella to get a large soft light source from your speedlight, as well as mount it on a light stand.
If you want something a bit stronger then the plastic base, you could always pick up the hot shoe adapter as well, http://www.kupogrip.com/hot-shoe-adapter
/ which is all metal, is much stronger, and locks positively around the shoe, whereas the speedlight stand is plastic, and the flash is only pressure fit.
I hope I answered your question. If I can help you any further, please let me know!
Jason – Your Gear Guru