839137001525
E-Z LOK 303-10 Thread Insert,5/8-11x11/16 L,Pk5 4ZB67
A nice touch is the clearly marked 1/4 in size on the packaging.
E-Z Lok 303-10-Pk5 Heavy Wall Self Locking Thread Insert, 5/8"-11 Int Thrd Sz,
The Staburags NBU 30 PTM handles intermittent use without any performance loss.