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Return to Parts List Category : A- Small Block "LA" : Fasteners : Rocker Arm Accessories ARP 300-8302 12 PT. 3/8" FT NUT W/ BLK OXIDE ROCKER ARM ADJUSTER NUTS $1.99   12-Point Head, Custom 450, Black Oxide, 3/8 in.-24 RH Thread These ARP nuts are made from aerospace-quality material. They are available in chromemoly or stainless steel, with 12-point style heads. They come in many sizes to meet just about all of your needs, and are rated at 180,000 psi tensile strength.