There is a variety of thread forms in use in the electrical industry. Matching the thread form or size of the gland to that of the equipment is a fundamental problem that is solved by using thread converters.
ISO Metric – Most IEC countries
NPT or National Pipe Taper – Used in North America
BSP or British Standard Pipe
Adaptors
bid
bid
90° Fixed Adaptor
for General Industrial and Hazardous Area Installations