Tokai Spring industries, Inc.

What Tokai Spring industries, Inc. does

Tokaibane Manufacturing Co., Ltd. (operating as Tokai Spring Industries / 東海バネ工業株式会社) is a Japanese custom spring manufacturer with origins in 1934 and formal incorporation in March 1944. The company is headquartered in Osaka's Nishi-ku and operates its primary manufacturing facility in Toyooka, Hyogo Prefecture. Tokai Spring produces metal springs on a fully made-to-order basis from a single-unit minimum, with an average lot size of approximately five units, spanning twelve or more spring types including compression, extension, and torsion coil springs; disc, leaf, volute, ring, mainspring, square, and conical springs; plus specialized products such as the proprietary i-MC Spring disc spring series for CNC machining center spindles, the Gate Robō rope overload and slack detection device, and the SSR super-extension spring for space applications.

Manufacturing capability extends to world-class dimensions (maximum material diameter ϕ90mm, maximum coil outer diameter ϕ600mm, disc spring plate thickness up to 40mm, volute spring plate thickness up to 35mm). The company holds ISO 9001, ISO 14001, and AS/EN/JISQ 9100 aerospace quality certifications and reports an on-time delivery rate of 99.9%. Proprietary technology assets include the patented i-MC Spring disc spring (achieving up to 50% size reduction and 190% higher clamping force versus standard products), the YUKI super coiling machine developed in-house and described as the world's only custom large-spring forming machine, backling control techniques for compression coil springs, in-house FEM analysis using ADINA and SOLIDWORKS, and exotic-alloy expertise (INCONEL, titanium, maraging steel) for extreme environments including cryogenic, high-temperature, hydrogen, and vacuum applications.

The business model is B2B direct sales with custom quote-based pricing, no public price list, and no subscription component for spring products. Revenue is generated primarily through one-time custom manufacturing orders, supplemented by fee-for-service testing, inspection, redesign/redrawing, and emergency express production. Go-to-market combines a dedicated in-house sales group, technical service staff for complex applications, trade show participation in Japan and abroad (Messanagoya, Monotsukuri World Osaka, JIMTOF, ITES Shenzhen, IETF New Delhi), free web-based spring design calculators (the Banetokun suite), an AI-powered spring consultation chatbot, and the customer-facing Re-Oda repeat-order portal that permanently archives specifications. Customers operate across fifteen or more verticals including aerospace (JAXA, Mitsubishi Heavy Industries for the H3 rocket program), machine tools, energy and power generation, steel mills, water infrastructure, seismic isolation (Tokyo Skytree tuned mass damper), medical equipment, marine equipment, food machinery, and semiconductors, with the company claiming top share in several niche applications including electric power, safety valves, machine tool spindles, aerospace, and water gate devices.

Name

Tokai Spring industries, Inc.

Legal name

Tokaibane Mfg. Co., Ltd. (東海バネ工業株式会社)

Website

https://tokaibane.com

Company type

Private

Founded year

1934

Operating status

Operating

Headcount range

1–10 employees

Short description

Tokaibane Manufacturing is a Japanese custom spring manufacturer founded in 1934, producing made-to-order metal springs for aerospace, machine tools, energy, and infrastructure. Holds AS9100, ISO 9001, and ISO 14001 certifications with 99.9% on-time delivery across 12+ spring types.

Ownership category

akta.pro rank

Headquarters

HQ city

Osaka (Nishi-ku)

HQ country

Japan

HQ region

Asia

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Custom Spring Manufacturing: Core revenue from design, manufacture, and sale of custom metal springs across 12+ spring types. Products are made to order (完全受注生産) from single units. Revenue is project-based, one-time per order, with no subscription component for the spring products themselves.
2. Spring Testing and Inspection Services: Fee-for-service testing including fatigue testing, hardness testing, FEM analysis, non-destructive testing, and spring inspection services offered to both existing customers and third-party spring users.
3. Spring Redesign/Redrawing Services: Technical consulting and redesign services for springs without drawings, including reverse engineering from physical samples and redesign optimization. Charged as part of the manufacturing order.
4. Spring Maintenance Services (RE:SPRING): Comprehensive maintenance service including spring inspection, spring drawing restoration, and express spring production for emergency replacement needs.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels7 records

Core offering

Tokai Spring Industries is a custom metal spring manufacturer specializing in multi-variety, small-lot (single-piece) made-to-order production of 12+ spring types including coil springs (compression, extension, torsion), disc springs (including the proprietary i-MC Spring series for machining center spindles), leaf springs, volute/tapered springs, ring springs, clock/mainsprings, square springs, and conical springs, plus specialty devices such as the Gate Robō rope overload detection system and the SSR super-extension spring for space applications. Production spans miniature to world-largest formats (max material Ø90mm, max coil OD Ø600mm) with materials including Inconel, titanium, maraging steel, and stainless steel. The company also provides complementary engineering services such as spring testing/evaluation, FEM analysis, drawing restoration, fast-track rush production, and inspection/maintenance (RE:SPRING).

Product overview

Tokai Spring Industries (Tokaibane) is a multi-variety, small-lot, fully custom-order spring manufacturer founded in 1934, producing springs one piece at a time on a made-to-order basis. The core product portfolio comprises over 12 spring types including coil springs (compression/extension/torsion), disc springs with the proprietary i-MC Spring series for machining center spindles, leaf springs, volute/tapered springs, ring springs, clock springs, square springs, and conical springs, plus the Gate Robō rope overload detection device and the SSR super-extension spring for space applications. These products are complemented by design support services including free online spring calculation tools (ばねっと君 suite), the AI-powered spring consultation chatbot, the customer Re-o-da repeat-order web portal, spring testing and evaluation services, spring inspection and maintenance (RE:SPRING), fast-track rush production, drawing restoration, and tool remake services. The company holds ISO 9001, ISO 14001, and AS/EN/JISQ 9100 certifications and serves industries spanning aerospace, machine tools, energy/power generation, oil & gas, nuclear, steel mills, construction/seismic isolation, water gates/bridges, medical/healthcare, robotics, semiconductors, food machinery, and agricultural equipment.

Differentiator

Problem solved

Functional benefit

Brands

• i-MC Spring: Machining center spindle disc springs - high precision disc springs for CNC machine tool spindles with long life, compact design, and high-speed rotation capability
• i-MC COMPACT
• Gate Robo
• SSR (Super Stretch Spring)
• Tokai Lab

Products and services

• Coil Springs (Compression, Extension, Torsion) Full range of coil springs (compression, extension, and torsion) manufactured from miniature to world-largest scale (max material diameter Ø90mm, max coil outer diameter Ø600mm). Materials include Inconel, high-strength steels, SWP-A, SWP-B, SUS304-WPB, and special alloys. Used across aerospace, power generation, industrial machinery, food machinery, and general manufacturing.
• Disc Springs Disc springs (皿ばね) including large-format disc springs with maximum plate thickness 40mm. Produced in stainless steel, high-strength steel, and special alloys. Available with technical guidance documentation and design support. Used for industrial machinery, machine tools, and various precision applications.

Quantifiable outcome

• Machining center spindle disc springs achieve up to 50% size reduction versus standard products (i-MC COMPACT)
• +7 more outcomes

Named customers12 records

Segments10 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability3 records

Feature10 records

Partnerships

Six partnerships are on record, tiered minor, notable and core.

• ITES2026 Shenzhen (深圳工業展)minorGTM or Marketing Partner · 1 January 2026Exhibited at ITES2026 Shenzhen International Industrial Manufacturing Technology Exhibition (March 31 – April 3, 2026) at Shenzhen World Exhibition & Convention Center, showcasing i-MC springs and high-precision industrial springs to international market.
• Osaka-Kansai Expo 2025 — Healthcare Pavilion 'Reborn Challenge' (大阪・関西万博 ヘルスケアパビリオン「リボーンチャレンジ」)notableStrategic or Co-development Partner · 1 January 2025Exhibited at the Osaka-Kansai Expo 2025 (May 26–June 2, 2025) in the Healthcare Pavilion's 'Reborn Challenge' zone, showcasing future manufacturing combining sensing technology, AI, and craftsmen skills.
• IETF2025 New Delhi (India Engineering & Technology Fair)minorGTM or Marketing Partner · 1 January 2025Participated in JETRO-organized Japan Pavilion at IETF2025 in New Delhi (February 20–22, 2025), showcasing specialty springs for machine tools, energy plants, and steelmaking.
• Messanagoya 2025 (メッセナゴヤ2025)minorGTM or Marketing Partner · 1 January 2025Exhibited at Messanagoya 2025 (November 5–7, 2025) in Nagoya, showcasing specialty springs in the Space Approach EXPO special zone.
• Mitsubishi Heavy Industries (三菱重工業株式会社)coreStrategic or Co-development Partner · 1 January 2024Tokai Spring developed and manufactures critical valve springs and separation springs for the H3 rocket's first-stage LE9 engine, second-stage LE5B engine, and stage separation mechanisms under contract to Mitsubishi Heavy Industries. These are critical, non-failure-acceptable components for Japan's next-generation flagship rocket.
• JAXA (宇宙航空研究開発機構)coreStrategic or Co-development Partner · 1 January 2024JAXA designated Tokai Spring as an official 'H3 Rocket Supporter.' The company participates in H3 rocket development through its springs used in rocket engine valves and separation systems, supplied via Mitsubishi Heavy Industries as the prime contractor.

Scale indicators8 records

Recent moves12 records

Expansion highlights6 records

Direct peers

• Lee Spring Company: US-based custom and stock spring manufacturer with deep catalog and custom-engineered offerings across compression, extension, torsion, and disc springs. Closest analog to Tokai Spring's custom, multi-variety, low-volume model in the North American market.
• Lesjöfors AB: Major European custom spring manufacturer with operations across multiple countries serving industrial, medical, and energy customers. Closest European analog to Tokai Spring's high-mix, low-volume custom spring model with similar breadth of spring types.
• Smalley Steel Ring Company: US specialist in retaining rings, constant-section rings, and wave springs — direct category overlap with Tokai Spring's ring/wave and disc spring lines. Serves aerospace, automotive, and industrial OEMs with engineered custom solutions.
• Century Spring Corp. Long-established US custom spring manufacturer offering compression, extension, torsion, and disc springs with extensive stock and custom engineering capabilities. Comparable business model serving similar industrial OEM customers.

Others

• MISUMI Corporation: Japanese industrial components distributor offering catalog springs (compression, extension, torsion) alongside custom configurable parts. Competes indirectly with Tokai Spring in standardized spring sourcing but differs fundamentally in business model (distribution vs. custom manufacturing).
• Daido Steel Co., Ltd. Japanese specialty steel manufacturer producing spring steel, high-performance alloys, and materials used by spring makers including Tokai Spring. Ecosystem supplier rather than direct competitor, but strategically critical to the supply chain Tokai Spring depends on.

Broad incumbents

• Barnes Group Inc. US-listed industrial conglomerate that owns Barnes Spring (formerly Associated Spring), a major custom spring manufacturer serving aerospace, transportation, and industrial markets. Broad portfolio with spring manufacturing as a core segment.
• Sandvik AB: Swedish multinational engineering group with materials technology and precision components divisions including spring wire and certain spring products. Adjacent as a materials/alloy supplier and occasional competitor in high-end industrial spring applications.
• MW Industries, Inc. Private parent company of Smalley, Associated Spring, and other precision spring brands. Operates a portfolio of spring specialists in the US and Europe with both custom and standard offerings — broader than Tokai Spring but adjacent in custom engineered springs.
• NHK Spring Co., Ltd. Japan's largest spring manufacturer (TSE-listed), serving automotive suspension, seat, and precision springs globally. Overlaps with Tokai Spring in precision disc and industrial springs but operates at vastly greater scale and automotive orientation.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/Tokaibane.co.jp
• LinkedInlinkedin.com/company/tokaispring

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

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 Tokai Spring industries, Inc.