316 Stainless Steel Tube

For fabrication of pulpits etc. I'd say 1.5mm 'ish is fairly usual. Seascrew stock 1.2mm. so that is probably OK.
I'd think of around 3mm and above as thick-walled, but OTT IMHO.
Nero Stainless have a range of tubes of various wall thicknesses around these values.
 
1.5mm is what I used and I formed my pulpit & pushpit with a hand operated pipe bender, wouldn't like to try bending 3mm wall by hand.
 
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