Dorman 799-021 Hex Nut-Grade 5-Thread Size 5/16-18, Height 1/2 In.

These nuts are manufactured using durable materials and corrosion tested to ensure required strength and longevity. Features- Durable materials - manufactured to specific thread tolerance standards | Corrosion tested - hardware undergoes salt spray testing to ensure corrosion resistance | Multipurpose usefulness - can be used in a variety of applications, from auto to home | Trustworthy quality - backed by team of professional engineers and quality control specialists in the United States