We will introduce the phenomenon where bolts and nuts become stuck and cannot be removed.
This article introduces the issues related to screw fastening in heat exchangers and piping, specifically the causes and solutions for "galling (seizing)." There are many factors said to contribute to galling, such as materials that are prone to galling, differences in thermal conductivity, and thermal expansion rates. However, galling occurs when the female and male threads rub against each other while tightening, generating frictional heat that causes the threads to momentarily melt, solidify, and seize. Therefore, the method of tightening that generates this frictional heat can be considered the fundamental cause of galling. As a solution, there is a "tensioning method" that allows for fastening without rotation. This fastening method enables tightening and loosening without rotation, thus preventing galling. [Proposed Products] ■ Super Bolt ■ Boltight *For more details, please refer to the PDF document or feel free to contact us.
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basic information
【Overview】 <Problem> ■ A phenomenon occurs where binding happens between the female and male threads while tightening bolts and nuts, making it difficult to tighten or remove the screws. <Result> ■ Cutting work on bolts and nuts ■ Replacement work with new ones, costs ■ Dangerous work with accident risk △ ⇒ Extension of construction period, accident risk, cost △ * For more details, please refer to the PDF document or feel free to contact us.
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For more details, please refer to the PDF document or feel free to contact us.
Company information
Nortlock Japan Co., Ltd. aims to be a partner in solving all bolt fastening challenges, centered around four brands: the "Nortlock Washer," a locking mechanism that does not rely on friction and prevents loosening; the "Superbolt," which allows enormous bolts and nuts that cannot be tightened by hand to be tightened with just one torque wrench; the "Boltight," which can simultaneously tighten multiple large-diameter bolts with uniform pressure; and the "Expander," a pivot pin for construction and heavy machinery that can be used semi-permanently.
