Easy visual confirmation of tightening! Responds to loosening due to wood shrinkage and other factors.
The "NRT Washer II" is a spring-function washer used for M12 bolt and nut fastening locations. It is a certified product by the Building Materials Testing Center, with a short-term allowable embedment resistance of 10.0 kN for coniferous trees, 8.6 kN for hinoki trees, and 6.7 kN for cedar trees, which is equivalent to or greater than the Z corner washer 4.5×40. Additionally, it is easy to confirm the fastening just by visually checking if the seating surface is flush. 【Features】 ■ Thin and lightweight ■ Prevents loosening with spring function and raised seating surface cut ■ Easy fastening confirmation *For more details, please refer to the catalog or feel free to contact us.
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【Specifications】 ■Standard/Dimensions: Washer for M12 ■Quantity: 400 pieces per case ■Material: JIS G4051 S50C ■Surface Treatment: BIK Coating *For more details, please refer to the catalog or feel free to contact us.
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For more details, please refer to the catalog or feel free to contact us.
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Kowa Co., Ltd. is a manufacturer of housing hardware that consistently produces everything from screws to metal fittings. In particular, we produce screws that are compatible with square bits instead of the conventional plus bit specification. Additionally, by changing the joining hardware that traditionally used bolts to screws, we have not only reduced cross-sectional defects but also eliminated the splitting of wood fibers, successfully increasing the joint strength of the hardware. Please leave your housing hardware needs to us.