Marked with a hardness classification of 300HV! It is recommended to combine with screw component strength classification 10.9.
We offer the "Flat Washer 300HV" to avoid the risk of sinking during bolt fastening. This product prevents sinking of the bolt seating surface, which is a cause of loosening of bolts and nuts, and can be used to stabilize the seating surface when the hole diameter is larger than the bolt diameter. The material used is S45C to S55C (domestic material), and it undergoes bright hardening and tempering heat treatment. 【Features】 ■ JIS B 1256:2008 ■ Recommended for use with screw part strength classification 10.9 (JIS B 1061:2020) ■ Marked with hardness classification 300HV ■ Compatible with mill sheets and inspection certificates *For more details, please refer to the PDF document 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 a single screw among 50,000 items to custom-made products, we respond to our customers' needs with the technology and know-how we have cultivated over half a century.
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