4x20 mm screw hex head class 8.8 (per unit)

4x20 mm screws

New Ø4x20 mm screw with hexagonal head adaptable for motorcycle, scooter, moped, 50cc quad, 125cc and other displacements.
Class 8.8 means that the screw is made of low carbon steel, which is considered the most common form of high tensile materials.
In general, class (or grade) 8.8 screws are treated with zinc and allow controlled tightening using a torque wrench. These screws have a breaking strength of approximately 800N/mm² and a yield strength of 640N/mm².

Technical characteristics and dimensions

• Brand: generic
• Material: steel
• Colour: grey
• Thread diameter: 4 mm
• No threading: 0.70
• Overall length: 23 mm
• Length under head: 20 mm
• Outer width of the head: 6.7 mm
• Sold individually
• Screws with an 7 key
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