11-08-2020, 01:40 AM
Modern hardware has heads of reduced depth etc and looks wrong even if the thread is not. Reduces the case for original. For fastenings not normally disturbed such as mudguared mounts metric not unreasonable provided not a mixture. For some repairs the small nut dia of UNF/UNC can be convenient. Non BSF taps and dies can be very cheap and can afford to modify where convenient for special jobs..