Undoing those dreaded SMA(F)-SMA(F) adapters

We have all had cause to deal with those cheap SMA(F)-SMA(F) adapters that do not have means to securely grip the body of the adapter to remove a properly torqued connector nut. These are commonly the type included in NanoVNA kits.

Above is a demonstration of my solution:

  1. a loose SMA nut has been cut longitudinally with a jeweller’s saw and the burs removed;
  2. the modified nut is threaded FULLY onto the adapter;
  3. the modified nut is gripped tightly with pliers to grip the adapter without damaging the threads;
  4. The cable nut is loosened using an 8mm wrench.

Above is a close up pic of the modified nut.

Avoidance is better

Don’t use adapters that do not have a means of securely gripping the body. Discard those you have to avoid accidentally using them. If you are going to discard the adapter, simply use a pair of pliers on the thread.

Adapters are available with flats in the middle, typically 5.5mm AF.

Here is an example:

Above, note the longer adapter with the flats in the middle. Be very careful to not accidently choose reverse polarity (RP) products.

Adapters are also available with a knurled section in the middle, you need to use pliers on them at the necessary torque.