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  3. 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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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)

EstablishmentDecember 26, 1957
capital3000Ten thousand
number of employees100
addressTokyo/Shinjuku-ku/2-5-2 Hyakunincho
phone03-3363-3711
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last updated:Nov 20, 2025
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  • Company information
  • Products/Services(78)
  • catalog(36)
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KOYAMA CO., LTD. Company Overview

"Do you have screws that are difficult to slip? I would like to request sheet metal processing. Can you make molded products?" We will solve your manufacturing-related problems!

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.

Business Activities

Development and sales of screws, cold-formed parts, springs and pressed parts, precision machined parts, adhesives, sealants, machine tools, labor-saving equipment, precision molded products, electrostatic discharge protection products, and environmental improvement products. The wholly-owned subsidiary "Toka Lock Co., Ltd." offers screw locking processing.

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Products/Services (78)

Flat washer product image
Flat washer
Hexagon socket set screw (hollow set) <pointed end> product image
Hexagon socket set screw (hollow set) <pointed end>
Hexagon socket set screw (hardened) <pointed tip> product image
Hexagon socket set screw (hardened) <pointed tip>
Hexagon socket set screw (hollow set) <flat tip> product image
Hexagon socket set screw (hollow set) <flat tip>

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catalog(36)

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WG-2187 Cut-resistant gloves

WG-2187 Cut-resistant gloves

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TST Corporation Swing Coupling

TST Corporation Swing Coupling

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Wonder Grip Glove Comprehensive Catalog

Wonder Grip Glove Comprehensive Catalog

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Spot cooler information and number of arrivals.

Spot cooler information and number of arrivals.

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news(9)

Specializing in screw loosening prevention processing, "Tōkai Lock Co., Ltd." has had a strong start two months after opening!

  • COMPANY

Tokai Rock, a group company of Koyama Co., Ltd. located in Numazu City, Shizuoka Prefecture, relocated its headquarters and factory at the end of last year and is now operating at full capacity with new equipment. At Tokai Rock, we protect our customers' screws from "loosening" and "deflection" over time by applying adhesive to the screw parts. We accommodate small lots, a variety of products, and short delivery times. Additionally, as a certified factory of the major adhesive manufacturer Henkel, we provide comprehensive support for environmental surveys and material certifications. Please feel free to contact the Development Sales Department of Koyama Co., Ltd. at ☎03 (3363) 3711.

Feb 20, 2026

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★★ "Recommended Ranking of Heat Dissipation Items" 1st to 2nd Place ★★

  • PRODUCT

Hello. This is Hayashi from Koyama Co., Ltd. Today, I would like to introduce the "Comprehensive Recommended Ranking of Heat Dissipation Items" that can help with thermal management of electronic devices! 1. Thermal Pads / Thermal Sheets ... Overall Rating: ★★★★★ (High ease of use, cost performance, and versatility) ● Advantages: A wide variety of thicknesses / Insulating and flexible, does not damage circuit boards or chips / Suitable for filling gaps between heat sinks and components / Easy to use, even for beginners, just by applying it. ● Suitable Applications / Overall Review Memory / VRAM / M.2 SSD / Power ICs / Driver ICs / General small devices The most versatile and least likely to fail, a universal type. 2. Heat Sinks & Cooling Fans ... Overall Rating: ★★★★☆ (High effectiveness but requires installation space and secure mounting) ● Advantages: Physically dissipates heat to the outside air, resulting in high cooling performance / Fin structure provides a large surface area, enhancing heat dissipation / When combined with fans, it exhibits even higher cooling performance. ● Suitable Applications / Overall Review High-power ICs / LED boards / CPUs / GPUs / High-heat modules The strongest cooling method when space can be secured and mounted. However, since securing installation space and mounting is a prerequisite, the environments in which it can be used are limited.

Dec 11, 2025

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★★ "Recommended Ranking of Heat-Release Items" 3rd to 4th Place ★★

  • PRODUCT

3. Graphite Thermal Diffusion Sheet / Pad ... Overall Rating: ★★★★☆ (Professional material for thin devices) ● Advantages: Thin (tens to hundreds of μm) and can be installed in tight spaces / High thermal diffusion performance in the plane direction / Minimal degradation, stable for long-term use / Many applications in smartphones and laptops ● Suitable Applications / Overall Review If you want to spread the heat from heat sources like smartphones, laptops, or M.2 SSDs across the chassis surface. A material that maximizes effectiveness in thin devices. However, thermal conduction in the thickness direction is weaker than that of metals. 4. Flocked Heat Dissipation (Heat exchange through flocking) ... Overall Rating: ★★☆☆☆ (Specialized for general applications) ● Advantages: High-efficiency heat exchange utilizing liquid film formation and evaporation/condensation / Highly effective with refrigerants and water cooling systems / Can increase surface area, making it effective for specific applications ● Suitable Applications / Overall Review Heat exchangers / Air conditioning and refrigerant circulation devices / Water cooling and evaporative cooling systems. A technology used at the level of heat exchangers in home appliances and factory equipment. Inquiries / Request for Materials ☎042-571-1911 (Contact: Nakasono) ● Please mention that you saw this on Ipros! ●

Dec 11, 2025

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Detailed information

Company name 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)
number of employees100
Contact addresspostalcode 169-0073 Tokyo/ Shinjuku-ku/ 2-5-2 HyakuninchoView on map TEL:03-3363-3711 FAX:03-3362-5560
Key PartnersToshiba Corporation and its group companies Hitachi, Ltd. and its group companies Panasonic Corporation and its group companies Mitsubishi Electric Corporation and its group companies SMC Corporation Meidensha Corporation Otis Elevator Company Japan Omron Corporation Seiko Epson Corporation and its group companies Olympus Corporation and its group companies Evident Corporation Ricoh Company, Ltd. and its group companies Fuji Xerox Co., Ltd. Furukawa Battery Co., Ltd. Nidec Corporation and its group companies Nihon Hassho Co., Ltd. Achilles Corporation Sekisui Plastics Co., Ltd. A&D Company, Limited and its group companies Yokogawa Electric Corporation Mitsubishi Steel Manufacturing Co., Ltd. France Bed Co., Ltd.
Business LocationsClick here for the list
Industry Trading company/Wholesale
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