Tatsumi

What Tatsumi does

Tatsumi (株式会社タツミ) is a Japanese manufacturer of metal joint hardware and pre-cut structural materials for wooden architecture, founded in 1978 in Niigata Prefecture and headquartered in Mitsuke City. The company designs, fabricates, and sells proprietary connector systems — most notably the Tec-One series and its evolution into Tec-One P3 Plus — that replace traditional Japanese wood joinery with concealed metal hardware and bolts, providing engineered earthquake resistance validated through independent 3D seismic testing. Product lines span beam-receiving hardware, column head/base connectors, reinforcing hardware, decorative fittings (Deco series), wide-flange beam systems (TN-WOLSH Beam/Burring Wall), and hardware certified under Z-mark, C-mark, and X-mark national standards for different wooden construction methods.

The company operates an integrated business model combining proprietary hardware manufacturing with CAD-linked automated precut wood processing, separate-delivery logistics, and OEM contract manufacturing for major Japanese housing material suppliers. Sales channels include a national direct-sales network (Tokyo, Nagoya, Osaka offices) serving house builders, non-residential timber construction projects (warehouses, schools, welfare facilities), and government clients. The OEM division supplies named major housing material makers and has received consecutive Best Supplier Awards (2025-2026). Manufacturing is conducted across Mitsuke, Tochigi (Kitakanto JV), and Toyama (JV) plants, with a legacy Hangzhou China JV supporting metal production. The company is privately held by the Yamaguchi family with 40 million yen capital and approximately 298 employees as of October 2025.

Name

Tatsumi

Legal name

株式会社タツミ

Website

https://tatsumi-web.com

Company type

Private

Founded year

1978

Operating status

Operating

Headcount range

251–500 employees

Short description

Tatsumi is a Japanese manufacturer of proprietary metal joint hardware and CAD-linked pre-cut wood materials for wooden architecture, supplying house builders, non-residential timber projects, and OEM housing-material makers across Japan via a national direct-sales and certified-product platform.

Ownership category

akta.pro rank

Product category

Construction Hardware

NAICS

Plate Work and Fabricated Structural Product Manufacturing (33231), Hardware Manufacturing (332510)

SIC

Fabricated Structural Metal Products (3440), Sheet Metal Work (3444)

akta.pro primary industry

Steel Joists, Joist Girders & Decking (IMADACAC)

Keywords

• Wooden construction hardware
• Metal joint connectors
• Structural metal fittings
• OEM metal fabrication
• Precut wood processing

Headquarters

HQ city

Mitsuke

HQ country

Japan

HQ region

Asia

Offices7 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. 木造建築用接合金物の製造販売: 梁受金物、柱頭柱脚金物、補強金物等の接合金具を製造し、住宅メーカーや建設会社に販売。
2. OEM生産: 大手住宅資材メーカーからの依頼によるOEM生産を受託。
3. プレカット木材加工: 構造材・羽柄材の加工服务。CAD連動の自動制御プレカット加工。

Go-to-market motion3 records

Distribution channels3 records

Marketing channels4 records

Core offering

Tatsumi manufactures and sells structural metal connection hardware (金物), especially the proprietary Tec-One series of joint connectors used in traditional Japanese wooden frame construction, along with related joist hangers, column head/base hardware, reinforcing hardware, TN-WOLSH beams, decorative hardware, and CAD-linked pre-cut wood processing services. The company supplies these products through direct national sales and OEM arrangements to housing manufacturers, pre-fab builders, and contractors of non-residential wooden buildings, with end applications spanning residential homes, warehouses, schools, nurseries, and welfare facilities.

Product overview

株式会社タツミ is a comprehensive wooden construction hardware manufacturer offering multiple interconnected product lines. The core product family includes Tec-One P3 Plus (advanced slim-profile joint system), Tec-One (original joint hardware), and TN-WOLSH series for large-scale construction. Supporting product lines include TN-multi for multi-purpose applications, Deco series for architectural aesthetics, and various reinforcing hardware (TRS 補強金物). The company also provides certified product lines under Z-mark, C-mark, and X-mark standards for different construction methods. Pre-cut wood processing and custom OEM production complement the hardware portfolio.

Differentiator

Problem solved

Functional benefit

Brands

• テックワン (Tec-One): Original joint connection hardware product line for wooden structural buildings, the evolution of the original Kuretekuto system
• TN-WOLSH
• TN-multi
• Decoシリーズ
• クレテック (Kuretekuto)

Products and services

• Tec-One P3 Plus (テックワンP3プラス) Advanced metal joint connection hardware for wooden construction, featuring a slim 100mm profile that sits inside the wood for reduced timber damage and superior earthquake resistance; built with bolts and drift pins. P3 Plus series.
• Tec-One (テックワン) Original metal joint connection hardware for wooden frame construction that replaces traditional Japanese wood joinery (Ari-Kama-Hozo) with metal connectors and bolts for superior seismic performance.
• TN-multi (ティーエヌマルチ) Multi-purpose hardware system for horizontal diagonal beam reception, renovation applications, and column replacement, with multi-rod variants available.
• TN-WOLSH Beam Wide-flange H-shaped beam series for large-scale wooden construction, enabling ceiling height optimization and cost reduction in non-residential wooden buildings.
• TN-WOLSH Burring Wall Burring wall panel system for large-scale wooden construction applications.
• Deco Series (デコシリーズ) Decorative metal hardware including Deco-tube cylindrical fittings and Deco-slit pattern fittings for exposed wooden-structure architectural aesthetics.
• Joist Hanger Hardware (梁受金物) Hardware for supporting beams including TN-X, TN high-capacity, Tec-One TH, Tec-One 3S TL, and Tec-One TCW models for various loads.
• Column Head and Base Hardware (柱頭柱脚金物) Pipe-based column connection hardware covering HDP, HIP, GP, PXB, TPB, HPB, PBH, and HDC series for different load capacities and applications.
• Hiuchi-Less Hardware (火打ちレス金物) Hardware system that replaces traditional fire-angle (hiuchi) braces in floor and roof construction.
• TRS Reinforcing Hardware (TRS 補強金物) Reinforcing hardware including catch ace, hold-down ace, spoon hold-down, box brace hardware, and other specialized connectors.
• Z-Mark Certified Hardware (Zマーク表示金物) Z-mark certified hardware for traditional wooden frame construction (在来工法), including hold-down hardware, anchor bolts, and various connector plates.
• C-Mark Certified Hardware (Cマーク表示金物) C-mark certified hardware for wooden frame wall construction (枠組壁工法), including column head hardware, band hardware, and beam support hardware.
• X-Mark Certified Hardware (Xマーク表示金物) X-mark certified hardware for wall panel construction, including tension hardware (TB, TC), shear hardware (SB, SBM, SP, D32), L-shaped hardware, and band hardware.
• Joint Tools (接合具) Connection tools including drift pins, medium bolts, round shaft bolts, pact nuts, and hold-down washers used to install joint hardware on site.
• Unit Rebar and BRS Method (ユニット鉄筋・BRS工法) Unit reinforcement bar system and BRS construction method for reinforced concrete housing components, developed jointly with partner B-A-S Co., Ltd.
• OEM and Custom Hardware (OEM・製作金物) Original equipment manufacturing and custom metal hardware production based on customer specifications, recognized with the OEM Division Best Supplier Award for two consecutive years (2025 and 2026).
• CAD-Linked Structural Pre-Cut Processing (プレカット木材加工) CAD-linked automated pre-cut processing service for structural wood members and plywood, supporting full pre-assembly of components with joinery hardware attached.

Quantifiable outcome

• 地震による柱のズレ・損傷ゼロ（三次元実大振動試験による実証）
• +2 more outcomes

Named customers4 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Seven partnerships are on record, tiered minor and core.

• 株式会社タツミ北関東工場minorOthers · 1 November 20062006年11月に栃木県日光市に合弁会社日本住宅構造製作所として設立。<現>株式会社タツミ北関東工場。
• 株式会社タツミ富山minorOthers · 1 November 1996富山県にスーパーベース製造の合弁会社として1996年11月に設立。
• 杭州愛龍金属制品有限公司minorOthers · 1 February 19911991年2月に中国に設立した合弁会社。2006年に資本金を$200万に増資し、杭州内に工場を移転・拡張した。
• TATSUMI GUAM U.S.A. IncminorOthers · 1 May 19891989年5月にグアムに住宅建材・プレハブ等の販売会社として設立した海外グループ会社。
• 株式会社テクセルcoreStrategic or Co-development Partner金物工法・金物接合躯体のプレカットを関東一円に提供するプレカット工場。構造や合板などのプレカットだけでなく、より快適で安全な住宅の 材料供給をする関連会社。
• 株式会社ビー・アール・エスcoreStrategic or Co-development Partner高性能住宅用鉄筋コンクリート部材評定の「実施権」「使用権」の供与、焊接・建築技術等の「知的財産権」の供与を行う関連会社。
• 竹村産業株式会社minorOthers関連リンクに記載されている関連会社。

Scale indicators4 records

Recent moves10 records

Expansion highlights5 records

Direct peers

• Knapp GmbH: Austrian manufacturer of concealed and visible wooden connection systems (KNAPP® RICON, GIGANT) used in timber-frame and large-span wood buildings. Comparable niche focus on invisible/architectural metal connectors for engineered wood, with overlapping large-span timber applications.
• 岡部株式会社 (Okabe Co., Ltd.): Japanese manufacturer of construction-related metal products including formwork hardware, anchors, and structural connectors. Comparable in operating as a Japanese metal-fabrication specialist serving the construction industry, with overlapping customer base among contractors and builders.
• 株式会社桐井製作所 (Kirii Construction Materials): Japanese manufacturer of metal building products for commercial construction (ceilings, floors, structural hardware, and engineered wood connectors). Comparable in combining structural metal hardware with engineered wood offerings for Japanese non-residential and residential construction.
• BXカネシン株式会社 (BXC Kaneshin): Japan's largest dedicated manufacturer of metal connectors and hardware for wooden construction (Z-mark, C-mark certified). Directly competes with Tatsumi across joist hangers, column hardware, and reinforcing products serving the same Japanese house makers.

Broad incumbents

• 文化シヤッター株式会社 (Bunka Shutter): Listed Japanese manufacturer of shutters, doors, and broader building products. Overlaps with Tatsumi in metal building components for residential and commercial construction but operates a much broader portfolio across many product categories.
• Simpson Strong-Tie: U.S.-based global leader in structural connectors for wood and concrete construction, with significant Japan and Asia-Pacific presence. Comparable product portfolio (joist hangers, hold-downs, structural screws) and a similar seismic-resistant hardware narrative, but at far larger scale.
• 積水化学工業株式会社 (Sekisui Chemical — Housing Division): Major Japanese housing manufacturer (Sekisui Heim) and buyer of OEM structural hardware. Comparable as a downstream customer/partner in the same wooden-construction supply chain and a credible vertical-integration alternative to specialized hardware makers.
• MiTek Industries: Berkshire Hathaway-owned global supplier of engineered connector systems, software, and component solutions for residential and commercial construction. Comparable in offering pre-engineered connector systems plus pre-cut/panelized wood components, but at global scale.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UCv_cfb6dtH6VnIlsx7rs8SQ
• Instagraminstagram.com/tatsumi_headoffice

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries7 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 Tatsumi