Inboard Castle Nut – Fits 1″ or 1-1/8″ shafts.

3/4-10 thread

Fits 1″ or 1-1/8″ shafts.

This castle nut can be replaced with a Nylock nut by clicking HERE.

• Brass propeller castle nut

• Thread size is 3/4-10 pitch

• Standard size for 1 inch and 1 1/8 inch diameter propeller shaft

• Nut hex size is 1 3/16 inch

• Commonly used in older inboard boats and some tow boat applications

Note, if you replace your castle nut with the Nylock Nut, the Nylock Nut will cover up the cotter pin holeas it will no longer be needed and highly recommended over the slotted castle nut!