Buna-N O-Ring | 8mm ID x 2mm Wide | 70 Durometer (4000/Pkg.) Undercut The 4-40 thread is a

The 4-40 thread is a common choice for precision assemblies

rounded top for flush mounting

With a slotted round head and a zinc yellow finish

Patch: Nylon Patch under head for surface protection and vibration damping

Buna-N O-Ring | 8mm ID x 2mm Wide | 70 Durometer (4000/Pkg.) Undercut The 4-40 thread is aThese Buna N (Nitrile) o rings are precision molded to 8 mm inner diameter and 2 mm cross section, rated 70 Shore A. Provides oil, fuel, and hydraulic resistance for general purpose service, with a service range of 40F to +250F. Material: Buna N (Nitrile) Size: 8 mm inner diameter by 2 mm cross section Color: Black Applications: General purpose sealing in oil, fuel, and hydraulic systems Specifications Product type: O Ring Material: Buna N (Nitrile)