Full Propeller Nut.

Whitworth. BSW.

5/8" 11 threads per inch. 32mm across flats

3/4" 10 threads per inch. 32mm across flats

1".   8 threads per inch.  43mm across flats

1 1/8" 7 threads per inch. 50mm across flats

1 1/4". 7 threads per inch. 50mm across flats

1 1/2".  6 threads per inch.

British Standard Fine. BSF.

5/8". 14 threads per inch. 32mm across flats

3/4". 12 threads per inch 32mm across flats

1".  10 threads per inch. 43mm across flats

1 1/8" 9 threads per inch. 50mm across flats

1 1/4". 9 threads per inch. 50mm across flats

1 1/2". 8 threads per inch.

Metric Fine.

14mm x 1.5mm pitch.

16mm x 1.5mm pitch.

20mm x 2.5mm pitch.

24mm x 3mm pitch.

Here for 316 Stainless Steel Locking Tab Washers