Grade Class 8.8 10.9 12.9 Black Oxide Zinc Nickel Plating Cross Recessed Round Head Metal Screw Assembled With Washer

This series of SEMS screws uses high‑strength carbon steel with property classes 8.8, 10.9 and 12.9 to cover medium to extreme load conditions. The cross recessed round (pan) head accepts standard Phillips drivers. Surface finishes include black oxide (with oil film), blue/white/yellow zinc plating, and nickel plating – each offering different levels of corrosion protection and appearance. A flat or combination washer is pre‑assembled to distribute load and protect the workpiece surface. These screws are designed for general mechanical, automotive and industrial applications where strength and cost‑effectiveness are key.

• Automotive brackets and shields: Grade 10.9 black oxide for engine periphery.
• Heavy‑duty packing cases: Grade 12.9 for impact resistance.
• Power tool housings: Grade 8.8 zinc plated for economy.
• Automation frames: nickel plating matches stainless steel colour.
• Furniture hardware: black oxide for indoor use with oil lubrication.

• Three strength grades allow precise selection for different loads.
• Multiple finishes provide flexibility between cost, corrosion resistance and appearance.
• Captive washer speeds up automated assembly.
• Cross recess is compatible with common PH/PZ bits.
• High toughness even at Grade 12.9 due to proper heat treatment.