Liner Dumper - Liner Dumper. Thread on track rod ends on steering - TomBrock

Please can anyone tell me what the thread is likely to be on the steering link of a Liner 1Ton Dumper from 1963. Obviously there are left and right handed threads, but I don't know what the thread is and I want to replace them as they are showing signs of age.

Thank you.

Liner Dumper - Liner Dumper. Thread on track rod ends on steering - MrEckerslikefromRamsbottom

Most likely UNF. Does an A/F spanner fit the nut?