We had 5,000 pieces of these custom countersunk double end studs manufactured for our customer that specializes in frozen drink equipment production. 304 stainless steel material was used and the thread was cut on both sides. Overall length was 41.66MM +/- 0.5 and both threaded sides incorporated 5/16-18 2A thread, at 10.16MM and 15.24MM in length accordingly. At the maximum diameter point the countersunk shoulder reaches 11.18MM +/-0.2.
We had these custom hex shoulder standoffs manufactured in 316 stainless steel for a physical and accelerator lab in two thread sizes - M3 and M4 thread sizes with 6g thread fit. The width across the flats on the hex measured 6.8-7MM and the main shoulder diameter measured 5.6MM +/-.05 and the step down shoulder diameter measuring 4.8MM +/- .05. The internal female M2 X 0.4 thread was tapped to a depth of 4MM min. Full certs were provided with the parts to meet our customer requirements.