Material: Carbon steel
Strength grades: 4.8, 8.8, 10.9, 12.9
Surface finishes: Plain / natural, blue-white zinc plated, yellow zinc plated, hot-dip galvanized, tempered blackened, Dacromet
High-strength blackened flat head socket cap screw. Treated with high-temperature oxidation blackening, resulting in a black matte finish. Cost-effective. Provides basic rust resistance; rust protection can be enhanced when used with lubricating oil. The appearance is understated and unobtrusive. Suitable for fastening applications where aesthetics are not critical, such as internal mechanical structures, furniture fittings, and general equipment.