Ten Caterpillar 6V9168 Bulkhead Nuts - 11/16"-16 -10 Nuts- New 
Thin Nut designed to secure Bulkhead fittings

11/16"-16 thread pitch, narrow jamb nut
Caterpillar p/n 6V9168

This listing is for 10 nuts
Cat List $4.14 ea.

See my other listings for 5 nuts