Aseismic Devices

What Aseismic Devices does

Aseismic Devices Co., Ltd. (株式会社免制震ディバイス) is a Japanese specialized manufacturer of seismic isolation and vibration control devices for buildings, founded in 1996 in Shinjuku, Tokyo and headquartered as of September 2025 in Minato-ku, Tokyo. The company designs, manufactures, and sells mechanical damping and isolation hardware to construction companies, building developers, and government entities across Japan, with installation in numerous Japanese buildings over its 30-year operating history.

Its product portfolio comprises seven core devices organized into two functional categories: vibration control dampers — VDW (viscous damping wall), VDWmini (compact viscous damping wall), RDT (rotary damping tube), iRDT (inertial rotary damping tube), and eRDT (eddy current rotary damping tube) — and seismic isolation bearings — CLB (cross linear bearing) and SnRB (tin-plug laminated rubber). The underlying technology spans multiple distinct physical mechanisms: viscous fluid shear resistance in steel-plate containers, ball-screw amplification converting linear motion to high-speed rotary motion, permanent magnet eddy current braking, and laminated rubber bearings with tin (rather than lead) damping plugs. Products carry Japanese ministerial certifications (大臣認定) from the Ministry of Land, Infrastructure, Transport and Tourism, third-party technical ratings from the Building Center of Japan, and ISO9001 quality certification (BCJ-QMS-0902, obtained March 2022). The eRDT was jointly developed with Nippon Steel Corporation and the iRDT with THK Co., Ltd. in collaboration with Tohoku University.

The business model is direct sales of custom-specified industrial hardware, supported by a Tochigi technical center (opened 2009) equipped with single-axis and 2-axis testing machines for mechanical performance validation and new device development. Revenue is generated through one-time product sales and installation with limited recurring maintenance — specifically, no fluid replacement is required during building service life. The company is a member of the Japan Seismic Isolation Structure Association and Japan Vibration Technology Association, became a subsidiary of Senqcia Co., Ltd. in January 2025, and now sits within the Noritsu Koki group after January 2026. No public pricing or financial figures are disclosed.

Name

Aseismic Devices

Legal name

株式会社免制震ディバイス

Website

https://adc21.com

Company type

Private

Founded year

1996

Operating status

Operating

Short description

Aseismic Devices Co., Ltd. designs, manufactures, and sells specialized seismic isolation and vibration control devices — including viscous damping walls, rotary damping tubes, and laminated rubber bearings — to construction companies, building developers, and government entities in Japan. Founded 1996, it is a Senqcia Group subsidiary backed by Noritsu Koki.

Ownership category

akta.pro rank

Product category

Seismic Isolation and Vibration Control Devices

akta.pro primary industry

Vibration Control & Anti-Vibration Products (Mounts, Bushings, Isolators) (IMANALAD)

Keywords

• Seismic isolation devices
• Vibration control systems
• Structural damping products
• Earthquake protection hardware
• Building safety devices

Headquarters

HQ city

Japan

HQ country

Indonesia

HQ region

Asia

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Technology or R&D, Personnel, Operations, Infrastructure, Marketing or Sales

Revenue model

1. Seismic isolation and vibration control device sales: Design, manufacture, and sale of seismic isolation and vibration control devices including VDW, VDWmini, RDT, iRDT, CLB, SnRB, and eRDT. Products are sold directly to construction companies, building developers, and government entities. Revenue is generated through one-time product sales and installation, with associated maintenance and support services.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

Aseismic Devices Co., Ltd. designs, manufactures, and sells seismic isolation and vibration control devices for buildings in Japan. The company offers seven core mechanical products — VDW and VDWmini viscous damping walls, RDT/iRDT rotary damping tubes, eRDT eddy current damping tube, CLB cross linear bearings, and SnRB lead-free tin-plug laminated rubber bearings — that protect structures, contents, and occupants from earthquake damage and vibration. Products are sold directly to construction companies, building developers, and government/public institutions, with technical consultation, installation support, and ongoing maintenance.

Product overview

Aseismic Devices Co., Ltd. is a specialized manufacturer of seismic isolation and vibration control devices for buildings. The product portfolio consists of seven core mechanical/structural products: four vibration damping devices (VDW, VDWmini, RDT, iRDT, eRDT) and three seismic isolation bearings (CLB, SnRB). These devices work through different mechanisms - viscous fluid resistance, rotary ball screw amplification, permanent magnet eddy currents, and rubber bearing deformation - to protect buildings from earthquake damage. The company also maintains a technical center in Tochigi Prefecture for testing and R&D, and has been a subsidiary of Senqcia Group since January 2025.

Differentiator

Problem solved

Functional benefit

Products and services

• VDW (Viscous Damping Wall / 粘性制震壁) Viscous damping wall made of multi-layer steel plates forming a thin box-shaped container filled with high-viscosity fluid, with a steel plate inserted from the top opening. Vibration causes the suspended steel plate to move through the viscous fluid, generating shear resistance that absorbs earthquake, wind, and mechanical vibration energy. Targeted at construction companies and developers for new buildings and retrofits.
• RDT (Rotary Damping Tube / 減衰こま) Rotary damping tube with an amplification mechanism using ball screw technology. Converts linear motion into amplified rotary motion via the ball screw, with viscous fluid resistance in the rotating outer cylinder providing large damping force. Available in seismic (small amplitude) and isolation (large amplitude) versions for construction companies and developers.
• CLB (Cross Linear Bearing / 直動転がり支承) Cross-shaped seismic isolation bearing combining LM guides with steel ball circulation mechanism, allowing free movement in any horizontal direction. Three variants are available: cross type (1 block), key type (2 blocks), and well type (4 blocks). Designed for residential and lightweight buildings where traditional laminated rubber bearings are not applicable due to insufficient weight.
• SnRB (Tin Plug Rubber Bearing / 錫プラグ入り積層ゴム) Lead-free tin-plug laminated rubber bearing that uses tin as a damping material in place of lead. Provides 1.7 times the damping capacity of equivalent lead-plug laminated rubber bearings, enabling reduced component count. Damper-integrated isolation bearing offering space efficiency, construction ease, and stable performance for new construction and retrofit projects.
• iRDT (Inertial Rotary Damping Tube / 慣性こま) Inertial rotary damping tube with an outer rotating mass added to the outer cylinder of the RDT. Building deformation is converted to high-speed rotary motion via ball screw, and the added mass generates larger rotational inertia that drives the viscous body energy absorption mechanism, producing greater damping force. Targeted at super-high-rise buildings and long-period seismic motion applications.
• VDWmini (Compact Viscous Damping Wall / 小型制震壁) Compact viscous damping wall with 4 or 6 inner steel plates in an approximately 1m square form factor. Achieves high damping performance through increased effective area and precision steel plate installation while offering easier integration into structures with space constraints.
• eRDT (Eddy Current Rotary Damping Tube / 渦電流こま) Permanent magnet eddy current rotary damping tube that combines a ball screw with permanent magnet eddy current damping technology. Generates eddy current resistance through relative velocity between rotating permanent magnets and a fixed braking ring surface, providing damping with minimal temperature dependence and stable performance under repeated long-duration deformation from long-period ground motion.

Quantifiable outcome

• Seismic building shaking reduced to 1/4 to 1/5 of conventional buildings during major earthquakes
• +2 more outcomes

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Eight partnerships are on record, tiered core and major.

• Nippon Steel Corporation (日本製鉄株式会社)coreStrategic or Co-development Partner · 1 January 2024Joint development partner for the eRDT (eddy current rotary damping tube) permanent magnet damping device. Combines Nippon Steel's expertise in steel materials with Aseismic Devices' damping technology to create a product with minimal performance degradation under long-duration repeated deformation.
• THK Co., Ltd. (THK株式会社)coreStrategic or Co-development Partner · 6 April 2012Joint development partner for iRDT (inertial rotary damping tube) announced in April 2012. Based on research by Professor Inoue's laboratory at Tohoku University Graduate School of Engineering.
• THK Co., Ltd. (THK株式会社)coreTechnology or IntegrationSupplier of LM guide components and linear guide systems used in CLB (cross linear bearing) products, and supplier of components for RDT and iRDT. THK is a leading manufacturer of linear motion guidance systems used in the CLB seismic isolation devices.
• SWCC Corporation (SWCC株式会社)majorTechnology or IntegrationSupplier of SnRB (tin plug laminated rubber bearing) components. SWCC provides specialized components for the SnRB seismic isolation device.
• Futaba Corporation (双葉株式会社)majorTechnology or IntegrationManufacturer of CLB assembly components and anchor plates and hardware for seismic isolation and vibration control devices.
• ENEOS Materials Corporation (株式会社ENEOSマテリアル)majorTechnology or IntegrationSupplier of viscous body materials used in VDW (viscous damping wall) products. Provides high-viscosity fluid components.
• Kawada Industries, Inc. (川田工業株式会社)majorTechnology or IntegrationPartner manufacturer for VDW (viscous damping wall) products.
• Building Center of Japan (日本建築センター)coreOthersIssues third-party technical evaluations (評定), ministerial certifications (大臣認定), and quality management certifications for seismic isolation devices. Aseismic Devices has obtained BCJ certifications for SnRB, RDT, and CLB products.

Scale indicators3 records

Recent moves8 records

Expansion highlights6 records

Direct peers

• Bridgestone Corporation: Global leader in rubber and tire products with a dedicated seismic isolation laminated rubber bearing business. Direct competitor to Aseismic Devices' SnRB product line in the Japanese construction market. <parameter name="peer_description">
• Oiles Corporation: Japanese manufacturer specializing in bearings and vibration/damping control products. Direct comparable in vibration control technology with similar customer base in construction and industrial machinery. <parameter name="peer_description">
• Sumitomo Rubber Industries: Major Japanese rubber company with seismic isolation rubber bearing offerings. Competes directly with Aseismic Devices in laminated rubber bearings for buildings. <parameter name="peer_description">
• THK Co., Ltd. Global leader in linear motion guidance (LM guides). Supplies components to Aseismic Devices for CLB, RDT, and iRDT, while also developing its own seismic isolation products — both partner and partial competitor. <parameter name="peer_description">
• Senqcia Corporation: Parent company of Aseismic Devices and itself a manufacturer of bearings and structural components. Operates in adjacent damping and bearing product categories serving similar industrial customers. <parameter name="peer_description">
• Nippon Steel Corporation: Co-developer of the eRDT product and one of the world's largest steel manufacturers. Comparable in advanced damping technology development and adjacent in structural products for construction. <parameter name="peer_description">

Broad incumbents

• Shimizu Corporation: One of Japan's largest general contractors with significant in-house seismic isolation engineering capability and a major customer for seismic isolation devices, including technologies comparable to Aseismic Devices. <parameter name="peer_description">
• Kajima Corporation: Major Japanese construction and civil engineering firm with proprietary seismic isolation technology and decades of experience integrating isolation systems into high-rise and infrastructure projects. <parameter name="peer_description">

Market position

Strengths1 record

Weaknesses1 record

Competitive moat4 records

Key risks7 records

Key highlights7 records

Customer concentration

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Aseismic Devices