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  6. Prevent forgetting to tighten screws! 'Screw Star σ'

Prevent forgetting to tighten screws! 'Screw Star σ'

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Koyama Co., Ltd.

last updated:Jul 06, 2026

KOYAMA CO., LTD. Head office, Tochigi branch, Tokyo branch, Kawasaki branch, Shizuoka branch, Osaka branch, Nagareyama local office, 4 overseas local companies (the Philippines, Shanghai, Hong Kong, Vietnam)
KOYAMA CO., LTD. Head office, Tochigi branch, Tokyo branch, Kawasaki branch, Shizuoka branch, Osaka branch, Nagareyama local office, 4 overseas local companies (the Philippines, Shanghai, Hong Kong, Vietnam)
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Counter for discovering and preventing forgotten tightening of screws (careless mistakes)

● This is a control device designed to be used in combination with an electric screwdriver to detect and prevent "forgotten screw tightening (human error)" and "incomplete screw tightening." ● It automatically measures the screw tightening time, making it easy to set up. (Manual settings allow for precise adjustments.) ● With the second timer setting, it can stop the screwdriver's rotation. (It alerts you when a long screw is mistakenly tightened.) ● It can memorize eight different screw tightening patterns and perform screw tightening by combining them sequentially. ● It is equipped with various I/O terminals, allowing for connection with automated machines. ● Even if multiple screwdrivers are used, you can increase the number of units through a daisy chain and control the screwdrivers in the order of operation. * For more details, please refer to the catalog. For inquiries, please contact Koyama Co., Ltd.

    Weighing Control
NEJISTARイプロス用.jpg

Prevent forgetting to tighten screws! 'Screw Star σ'

NEJISTARイプロス用.jpg
NEJISTARイプロス用.jpg
  • Details about "Nejistar σ" are here!
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basic information

● This is a control device designed to be used in combination with an electric screwdriver to detect and prevent "forgotten screw tightening (human error)" and "incomplete screw tightening." ● It automatically measures the screw tightening time, making it easy to set up. (Manual settings for precise adjustments are also possible.) ● With the second timer setting, it can stop the screwdriver's rotation. (It alerts you when a long screw is mistakenly tightened.) ● It can memorize eight different screw tightening patterns and perform screw tightening by combining them sequentially. ● It is equipped with various I/O terminals, allowing for connection with automated machines. ● Even if multiple screwdrivers are used, you can increase the number of units through daisy chaining, and further control the screwdrivers in the order of operations.

Price information

-

Price range

P2

Delivery Time

P3

Applications/Examples of results

●Preventing forgetting to tighten screws at the production site ●Improving the reliability of automated machines ●Alleviating workers' anxiety

catalog(1)

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Screw Tightening Reminder Counter "Screwster σ"

Screw Tightening Reminder Counter "Screwster σ"

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Company information

KOYAMA

KOYAMA CO., LTD. Head office, Tochigi branch, Tokyo branch, Kawasaki branch, Shizuoka branch, Osaka branch, Nagareyama local office, 4 overseas local companies (the Philippines, Shanghai, Hong Kong, Vietnam)

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Our company is a specialized trading firm that handles a wide range of products related to manufacturing, centered around "screws." We offer not only tools, carts, and standard screw products but also processed and drawing items made of metals, plastics, and harnesses. Additionally, we handle various types of transport robots such as AGVs and AMRs. Since our establishment in 1957, we have been engaged in transactions with many suppliers both domestically and internationally. Our strengths lie in our reliable quality, competitive pricing, and speedy responsiveness. In addition to our headquarters in Tokyo, we have branches in Kawasaki, Tochigi, Shizuoka, Osaka, the Philippines, Vietnam, Shanghai, and Hong Kong, where our sales representatives provide consistent support from quotations to after-sales follow-up. We also have a subsidiary, Tokai Lock Co., Ltd., which specializes in anti-loosening processing for screws. We will provide optimal proposals tailored to your needs, so if you have any issues related to manufacturing, please feel free to contact Koyama Co., Ltd.

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