Dorman Motormite 44097 Threaded USS & SAE Fasteners, Hex Lock Nuts with Nylon Ring Insert, Grade 2 Dorman Motormite 44097 Threaded USS & SAE Fasteners, Hex Lock Nuts with Nylon Ring Insert, Grade 2 Features: Hex Lock Nuts with Nylon Ring Insert, Grade 2 Thread Size: 1/2-13 Hex Size: 3/4" Height: 19/32" Series: UNC/USS Brand: Dorman - AutoGrade - Keep-Tite!