Gasket Packing Q&A No. 20 Torque Management Guidelines
Is there a guideline for torque management when tightening bolts?
It is difficult to implement torque management for all flanges. Please refer to the following for an idea of the force generated by tightening. Guidelines for pulling force Generated force F - An adult pulling with just wrist strength → 50–100 N - An adult pulling with one arm strength → 100–200 N - An adult pulling with upper body strength → 200–400 N
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■Things to be careful about with non-asbestos joint sheets 〇 Tighten with sufficient force from the beginning 〇 Do not retighten after a period of time following temperature rise → The gasket hardens due to heat, and retightening after hardening may lead to gasket breakage 〇 When used for steam seals, special care is needed as hardening is more likely to occur → Compared to asbestos joint sheets, higher tightening force is required, and the lifespan is shorter
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Daiko is a manufacturer specialized in processing various industrial products, including gaskets and packing. With industry-leading processing equipment, including one of Japan's largest water jet cutting machines, and a wide range of materials such as joint sheets, rubber, resin, and metal, we meet our customers' diverse needs. Leveraging the technology and experience we have cultivated over 50 years, we provide high-quality, short-lead-time, and low-cost products to contribute to solving our customers' challenges. To respond to our customers' varied needs, Daiko's production bases are equipped with various processing facilities. Among them, the water jet cutting machines, with a total of four installed at our Osaka headquarters and Tokyo branch, boast one of the largest scales in the country. The maximum processing range is W4,000 × L5,500 mm, allowing for the high-precision manufacturing of large-diameter gaskets and packing. By maximizing material efficiency, we achieve the provision of 'high quality at low cost.'