Material uses S45C to S55C (domestic material)! It is recommended to combine with screw part strength classification 10.9.
We would like to introduce the "Flat Washer 300HV" handled by Sanwa Ai. It prevents the nut or bolt head from sinking into the joined material. When the hole diameter is larger than the bolt diameter, it can be used to stabilize the seating surface. The material used is S45C to S55C (domestic material), and it undergoes bright quenching and tempering heat treatment. 【Features】 ■ JIS B 1256:2008 ■ Recommended for use in combination with screw part strength classification 10.9 (JIS B 1061:2020) ■ Marked with hardness classification 300HV ■ Can provide mill sheets and inspection certificates *For more details, please refer to the PDF materials or feel free to contact us.
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Sanwa Ai is a trading company specializing in the research and development of screws. From one screw among 50,000 items to custom-made products, we respond to our customers' needs with the technology and know-how cultivated over half a century.