Dorman Motormite 44094 Threaded USS & SAE Fasteners, Hex Lock Nuts with Nylon Ring Insert, Grade 2 Dorman Motormite 44094 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: 5/16-18 Hex Size: 1/2" Height: 11/32" Series: UNC/USS Brand: Dorman - AutoGrade - Keep-Tite!