I agree with klhansen, it is a type of compression fitting. On initial installation it compresses around the object to form a mechanical seal, or in tis case a tight joint to hold the cable end. You should be able to find one a good FLAPS.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy