M20-2.5 x 150 Metric Socket Head Cap Screw Class 12.9 ISO 4762 Black Ox 5/16-18-.125 It is a class 8

It is a class 8 nut

and provides a secure and durable hold

It is also commonly used in marine applications due to its corrosion resistance

which means that it has a hexagonal head with a recessed center

ensuring a clean and polished finish

M20-2.5 x 150 Metric Socket Head Cap Screw Class 12.9 ISO 4762 Black Ox 5/16-18-.125 It is a class 8The M20 2. 5 x 150 Metric Socket Head Cap Screw Class 12. 9 ISO 4762 Black Ox is a high strength fastener designed for demanding applications. It features a hexagonal socket head for easy driving and a black oxide finish for corrosion resistance. The screw is made of alloy steel and heat treated to a tensile strength of 12. 9, making it suitable for use in high stress environments. It is also RoHS compliant, making it safe for use in electronic