GUWANJI 12.9 Grade Blackened Alloy Steel Countersunk Hex Screws

High-strength GUWANJI internal hexagon countersunk screws, crafted from durable alloy steel with a blackened surface treatment for enhanced corrosion resistance. These 12.9 grade fasteners meet GB/T 70.3 standards, ideal for demanding applications requiring a flush finish.

Material: alloy steel Surface treatment: Black Performance level: 12.9 type: Internal hexagon countersunk screw Implementation Standards: GB /T 70.3