What SJ Tech does

SJ Tech (주식회사 SJ테크) is a privately held Korean precision die casting and alloy materials manufacturer headquartered at the Seongseo 4th High-tech Industrial Complex in Daegu, South Korea, operating since 2003 with a workforce in the 1,001-5,000 range. The company supplies die-cast components and proprietary alloy materials to two primary B2B end markets: mobile phone manufacturers and automotive manufacturers, with a third 'other products' category indicating a smaller adjacent industrial base. Its product portfolio is built on a single integrated technology stack that spans alloy material formulation (high-strength, high thermal conductivity, and high corrosion resistance alloys), precision die casting, proprietary mold design, and assembly module integration, all developed and produced through an in-house R&D institute with dedicated research equipment.

The business model is direct B2B sales to enterprise OEM customers; pricing is not publicly disclosed. Distribution is direct, with a stated 'global' geographic scope claim but no specific international offices listed beyond the Daegu headquarters. The company holds ISO 9001 quality management certification and operates a formal high-strength handling channel (grievance channel), both of which are baseline requirements for Tier-2/3 supplier status to large mobile phone and automotive OEMs. The company maintains at least one affiliated subsidiary (계열사) in the die casting and alloy industry, and operates as a Korean stock company (주식회사) under CEO Heo Il (허일).

Governance signals are consistent with an operating, structured private company: the firm publishes shareholder registry closure notices (referencing Korean Commercial Code Article 354) with dates of December 2021 and December 2022, indicating an organized shareholder-based ownership structure rather than dispersed venture-backed cap table. The website copyright begins from 2020, and corporate self-positioning emphasizes 'Global Leading Company in Die Casting & Alloy Industry.' No public listing, ticker, or recent external funding rounds are disclosed beyond a single 2007 Shinhan Venture Investment event, and no financial figures (revenue, headcount growth, deal volume) are publicly available.

Name

SJ Tech

Legal name

(주)SJ테크

Website

https://sjtech87.co.kr

Company type

Private

Founded year

2003

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

SJ Tech is a Korean B2B precision die casting and proprietary alloy materials manufacturer that supplies components for mobile phone and automotive OEMs from its Daegu headquarters, leveraging in-house R&D across alloy formulation, mold design, and assembly module integration.

Ownership category

akta.pro rank

Product category

Precision Die Casting Components

NAICS

Hardware Manufacturing (332510), Semiconductor and Other Electronic Component Manufacturing (33441)

SIC

Screw Machine Products (3451), Electronic Components & Accessories (3670), Fabricated Structural Metal Products (3440)

akta.pro primary industry

Metal Forming & Fabrication Machines (Presses, Bending, Shearing, Stamping) (IMAHADAC)

Keywords

• Die casting parts
• Alloy materials manufacturing
• Mobile phone components
• Automotive die casting
• Precision metal parts

Headquarters

HQ city

Daegu

HQ country

South Korea

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Distribution channels1 record

Marketing channels1 record

Core offering

SJ Tech manufactures precision die-cast components and develops proprietary alloy materials for use in mobile phones, automobiles, and other industrial applications. Its portfolio spans high-strength, high thermal conductivity, and high corrosion resistance alloy materials; die-cast mobile phone parts; die-cast automotive parts; and other die-cast products, all built on integrated die casting, mold, and assembly module capabilities.

Product overview

SJ Tech operates as a die casting and alloy materials specialist offering a unified product portfolio centered on its core die casting technology. The company provides alloy materials (including high-strength, high thermal conductivity, and high corrosion resistance variants), precision components for mobile phones and automotive applications, and related manufacturing processes. All offerings are built upon the company's foundational die casting expertise and R&D capabilities in mold technology and assembly module technology.

Differentiator

Problem solved

Functional benefit

Products and services

• Alloy Materials (합금소재)

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Scale indicators1 record

Recent moves5 records

Expansion highlights4 records

Direct peers

• Dynacast (Form Technologies): Global precision die casting manufacturer producing small, engineered metal components for automotive, electronics, and consumer industries. Closest direct peer given overlapping multi-metal die casting capabilities and shared mobile/auto customer base.
• Ryobi Die Casting: Japanese die casting specialist serving automotive and electronics OEMs with aluminum and zinc die cast parts. Comparable in process technology and end-market mix to SJ Tech's mobile and automotive exposure.
• Nemak: Mexican-headquartered global aluminum die caster primarily serving automotive OEMs for engine, transmission, and structural EV components. Overlaps with SJ Tech's automotive die casting focus at significantly larger scale.
• Shiloh Industries: US-based manufacturer of lightweight aluminum and magnesium die cast and sheet metal components for automotive OEMs. Comparable in metal forming/fabrication and automotive customer focus.
• Gibbs Die Casting: North American producer of aluminum and magnesium die cast parts serving automotive and industrial markets. Comparable process technology and customer verticals to SJ Tech.
• Endurance Technologies: Indian tier-1 automotive component manufacturer with significant die casting and alloy casting operations for two-wheeler and four-wheeler OEMs. Comparable in automotive die casting focus.
• Tupy: Brazilian-headquartered global manufacturer of complex cast iron and steel components for automotive, hydraulics, and industrial markets. Comparable as a large-scale metal casting supplier to industrial and automotive customers.

Broad incumbents

• Martinrea International: Diversified automotive metal forming and assemblies supplier with die casting capabilities among a wider product portfolio. Comparable in automotive parts manufacturing but at much broader scope.
• Magna International: Global automotive mega-supplier with die casting, metal forming, and complete vehicle assembly capabilities. Relevant as a large incumbent competing for the same automotive platform awards as SJ Tech.

Regional players

• Sundaram-Clayton: Indian die casting and auto component manufacturer (part of TVS group) focused on two-wheeler and passenger vehicle markets. Comparable in process technology but serving different geographic customers.

Market position

Strengths3 records

Weaknesses4 records

Competitive moat3 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/sjtech87

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries1 record

Funding overview

Funding rounds1 record

Investors1 record

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 SJ Tech