2b thread class right-hand 18 thread quantity per inch shell made of wrought aluminum; finish is cadmium, olive drab over nickel; complete fluid resistance; service life 20 years or 1000 hours unef thread series
2a single threaded stud thread class 0.187" single threaded stud thread length 40 single threaded stud thread quantity per inch low level: 10 milliamperes resistive at 30 millivolts dc or 30 millivolts peak ac. disc unc single threaded stud thread series
2a single threaded stud thread class 40 single threaded stud thread quantity per inch low level: 10 milliamperes resistive at 30 millivolts dc or 30 millivolts peak ac. disc unc single threaded stud thread series