What MARUTATSU does

MARUTATSU (株式会社マルタツ) is a Japanese B2B contract manufacturer founded in 1969 and headquartered in Ryugasaki, Ibaraki Prefecture, Japan. The company designs and manufactures precision-welded and machined structural components for construction machinery — primarily hydraulic excavator upper structures, lower structures, special-spec machines, large dump bodies, wheel loaders, and attachments — and supplies them directly to major Japanese construction machinery OEMs under long-term procurement contracts. Hitachi Construction Machinery has been its anchor customer since 1972, with secondary relationships at Furukawa Rock Drill (since 2001) and Nikken Kogyo. The company is family-owned (founder Iida family retains management control; Chairman Iida Shuryo and President Iino Shoji), has a paid-in capital of ¥50M, and operates without external equity funding.

The company's core technology stack centers on a vertically integrated one-stop manufacturing process: plate cutting and bending (can assembly / 缶組), MIG/MAG and TIG welding (manual and robotic), CNC machining via 10 vertical/horizontal machining centers (including a 3,000×5,000mm gantry unit capable of parts up to 6m × 3.5m × 0.6m), shot-blast surface treatment, and painting. Quality assurance is anchored by 19 robotic welding cells with coordinated positioners (0.2t–20t capacity), 16 robotic welding specialists, Keyence WM-6000 non-contact 3D measurement systems (micron-level precision), and Olympus omniScan SX phased array ultrasonic flaw detectors for safety-critical weld inspection. Capacity is split across the Ryugasaki Factory (12,333㎡ building area on 32,246㎡ land) and Kasumigaura Factory (4,204㎡ building on 11,904㎡ land), with a Phase 4 Ryugasaki expansion completed in November 2024. An internal welding qualification standard (MWS) and the "Monozukuri Daigaku Takumi" craft education program formalize skill development, and EcoStage environmental certification (ISO 14001-compatible) has been held at both factories since 2007/2010.

MARUTATSU generates revenue through per-unit hardware sales of custom-manufactured components under direct B2B contracts, with no channel intermediaries, e-commerce, or self-serve sales. It does not publicly disclose component pricing. With 221 employees and FY2025 revenue of ¥7.47B (≈$50M USD), the company operates as a focused regional SME supplier with high customer concentration on Hitachi Construction Machinery. The company is reinvesting organically into capacity and talent — evidenced by the Phase 4 factory expansion, the 19-room Kasumigaura dormitory, and the March 2026 "100 Billion Yen Declaration" approved by Japan's Small and Medium Enterprise Agency — targeting ¥10B in revenue as a multi-year growth goal.

Name

MARUTATSU

Legal name

株式会社マルタツ

Website

https://marutatsu-hp.co.jp

Company type

Private

Founded year

1969

Operating status

Operating

Headcount range

101–250 employees

Short description

MARUTATSU is a Japanese B2B manufacturer (founded 1969) producing precision-welded and machined structural components — excavator upper/lower structures, dump bodies, wheel loaders, and attachments — directly for major construction machinery OEMs, primarily Hitachi Construction Machinery. The company operates an integrated can-assembly, robotic welding, CNC machining, and NDT workflow across two factories in Ibaraki Prefecture.

Ownership category

akta.pro rank

Product category

Construction Machinery Component Manufacturing

NAICS

Plate Work Manufacturing (332313)

SIC

Fabricated Structural Metal Products (3440), Fabricated Plate Work (Boiler Shops) (3443)

akta.pro primary industry

Steel Plate, Sections & Welded Assemblies (IMADACAD)

akta.pro secondary industry

Structural Steel Fabrication (IMADACAA)

Keywords

• Construction machinery components
• Metal fabrication services
• Heavy equipment manufacturing
• Structural welding
• CNC machining services

Headquarters

HQ city

Ryugasaki

HQ country

Japan

HQ region

Asia

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Operations, Infrastructure, Technology or R&D, Others

Revenue model

1. Construction Machinery Component Manufacturing & Sales: MARUTATSU designs and manufactures structural components for construction machinery — primarily excavator upper/lower structures, special-spec machines, large dump bodies, wheel loaders, and attachments — and supplies them directly to major OEMs (Hitachi Construction Machinery, Furukawa Rock Drill). Revenue is generated through long-term procurement contracts and per-unit pricing for custom-manufactured components. Non-mass production, individual/custom orders and prototypes are also accommodated.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

MARUTATSU is a B2B contract manufacturer that designs and fabricates precision-welded and machined structural components for construction machinery — including excavator upper structures, lower structures, special-spec machines, large dump bodies, wheel loaders, and attachments — supplied directly to major Japanese OEMs such as Hitachi Construction Machinery. The company operates a one-stop in-house production chain covering can assembly (plate cutting/bending), MIG/MAG/TIG/robotic welding, CNC machining, shot blasting, and painting, supported by phased-array ultrasonic NDT and 3D measurement for quality assurance on safety-critical welds.

Product overview

Marutatsu is a manufacturing company specializing in construction machinery components, primarily supplying to major manufacturers like Hitachi Construction Machinery. The company produces hydraulic excavator components (upper structure, lower structure, special specifications), large dump trucks, wheel loaders, and attachments. These products are manufactured through integrated services including tank assembly and welding (plate thickness 1.6mm-100mm+), CNC machining (up to 6m×3.5m×0.6m), shot blasting and painting, and robot welding (19 systems). The company operates from Ryugasaki Factory and Kasumigaura Factory with a total of 221 employees and 2025 sales of 7.47 billion yen.

Differentiator

Problem solved

Functional benefit

Products and services

• Hydraulic Excavator Upper Structures (油圧ショベル上回り)

Quantifiable outcome

• Revenue reached 74.7 billion yen in FY2025 with a declared 100 billion yen growth target.
• +4 more outcomes

Named customers4 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

One partnership is on record.

• 日立建機株式会社 (Hitachi Construction Machinery Co., Ltd.)coreOthers · 1 November 2023MARUTATSU has been a manufacturing supplier to Hitachi Construction Machinery since 1972 (over 50 years), supplying excavator upper/lower structures, special-spec machines, wheel loaders, and attachments. Also received 2022 Excellent Procurement Partner award and international/domestic welding skills competition recognitions.

Scale indicators8 records

Recent moves8 records

Expansion highlights4 records

Broad incumbents

• Caterpillar: Global construction and mining equipment leader. Operates an extensive Tier-1 fabrication supplier base worldwide, with established Japanese suppliers. Relevant comparable for the construction equipment value chain MARUTATSU operates in, and a potential customer for expanded geographic reach.
• Komatsu: Largest Japanese construction equipment OEM with a global excavator, dump truck, and wheel loader portfolio. Operates a vertically integrated fabrication supply chain with a similar Tier-1 supplier ecosystem to MARUTATSU's, making it a relevant comparable for understanding OEM-supplier dynamics in Japanese construction equipment.
• Hitachi Construction Machinery: The dominant Japanese construction equipment OEM and MARUTATSU's largest customer since 1972. Hitachi has its own Ryugasaki and Kasumigaura plants on the same geographic footprint as MARUTATSU, representing both a major buyer and a potential in-house fabricator that competes for outsourced work.
• Takeuchi Manufacturing: Japanese compact excavator and track loader manufacturer. Sourced from Japanese welding/fabrication Tier-1 suppliers and operates in the same construction equipment component supply chain that MARUTATSU serves, making it a relevant comparable for the supplier ecosystem.
• Yanmar Holdings: Japanese construction equipment, compact machinery, and engine manufacturer with significant Tier-1 fabrication outsourcing. Operates in similar small-to-mid excavator and wheel loader segments as MARUTATSU's OEM customers, making it a relevant adjacent comparable for component sourcing patterns.
• Kobelco Construction Machinery: Japanese excavator and crawler crane OEM (Kobe Steel group). Comparable to Hitachi as a domestic OEM that sources welded/machined structural assemblies from Japanese Tier-1 fabricators, representing both a potential customer and a competitor for outsourced welding work.
• Sumitomo Construction Machinery (Sumitomo (S.H.I.) Construction Machinery): Japanese crawler crane, excavator, and road machinery OEM. Comparable to Hitachi and Kobelco in its reliance on Japanese Tier-1 fabricators for structural steel assemblies, representing a potential customer or competitor for MARUTATSU's services.

Regional players

• Sany Heavy Industry: Largest Chinese construction equipment OEM with a global excavator, crawler crane, and concrete machinery portfolio. Operates its own vertical fabrication supply chain in China that competes with Japanese Tier-1 fabricators on cost for export markets — relevant for understanding competitive pressure on Japanese suppliers like MARUTATSU.
• LiuGong: Major Chinese construction equipment OEM with growing global presence. Operates a similar vertically integrated fabrication supply chain model and represents a long-term competitive alternative for global OEM sourcing decisions that could affect Japanese Tier-1 suppliers.

Others

• HBC-radiomatic / Konecranes (overhead crane peer): While not a direct competitor, Konecranes and similar overhead/gantry crane manufacturers supply the lifting equipment that MARUTATSU uses internally across its 13 overhead cranes and 9 gantry cranes at Kasumigaura. Relevant as an enabling equipment supplier for the fabrication process MARUTATSU performs.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 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 MARUTATSU