DSLRKIT Male to Male M-M FLASH PC Sync Cable Cord with Screw Lock

I have Youngnuo 600EX-RT which i want to use with Fujifilim X-T1. Will this cable help for high speed sync?

Will this cable connect to a flash that does not have a threaded port?

I have a hasselblad 80mm 2.8 cf lens and a neewer 750ii, has anyone tested to see if this cord works in that or a similar hasselblad v configuration?

Is the screw lock required or will friction fit be sufficient to hold this snugly to the camera and flash unit?