NAGAKI SEIKI Co., LTD.

Name

NAGAKI SEIKI Co., LTD.

Legal name

株式会社永木精機 (NAGAKI SEIKI Co., LTD.)

Website

https://ngk-nagaki.com

Company type

Private

Founded year

1946

Operating status

Operating

Headcount range

1–10 employees

Ownership category

akta.pro rank

Product category

Professional Safety Hand Tools for Electrical and Infrastructure Construction

NAICS

Electrical Equipment Manufacturing (33531), Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515), Relay and Industrial Control Manufacturing (335314)

SIC

Cutlery, Handtools & General Hardware (3420), Electrical Industrial Apparatus (3620)

akta.pro primary industry

Transmission & Distribution Line Equipment (Bushings, Insulators, Arresters, Conductors, Hardware) (IMAGAAAF)

akta.pro secondary industries

Electromechanical Components (Relays, Switches, Potentiometers, Encoders) (IMAGAJAB), Cable Glands, Sealing & Strain-Relief (glands, grommets, seals, cord grips, strain relief) (IMAGAEAI)

Keywords

• Safety hand tools
• Live-line tools
• Cable tensioning equipment
• Insulated hand tools
• Electrical construction tools

Headquarters

HQ city

Daito City, Osaka

HQ country

Japan

HQ region

Asia

Offices12 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Professional Safety Tool Sales: Direct sales of professional-grade safety hand tools including ratchet pullers, wire grips, tension meters, ratchet wrenches, cable peelers/strippers, and cable cutters to infrastructure companies. Products are sold as one-time purchases with ongoing after-sales service and maintenance support.
2. After-Sales Service and Maintenance: Manufacturer periodic inspection services and replacement parts (chains, wires, belts, cams) to ensure continued safe operation of tools. Required periodic maintenance emphasized in safety notices.

Pricing tiers

Go-to-market motion2 records

Distribution channels2 records

Marketing channels5 records

Core offering

NAGAKI SEIKI manufactures professional-grade safety hand tools for electrical, railway, telecommunications, and construction infrastructure work, including ratchet pullers, wire grips (Kamura), tension meters, insulated ratchet wrenches, cable peelers/strippers, cable cutters, and specialized hot stick / hot puller tools for live-line (energized) operations. All products are designed and manufactured in Japan and sold directly to enterprise customers including power utilities, railway operators, telecom companies, electrical construction firms, and government/defense agencies, with after-sales inspection and replacement parts services.

Product overview

NAGAKI SEIKI is a safety tools manufacturer specializing in professional-grade tools for electrical, railway, telecommunication, and construction infrastructure. The product portfolio centers on five core tool categories: Ratchet Pullers (wire, belt, and chain tensioning tools for cable pulling), Wire Grips/Kamura (cam-operated gripping tools with various capacity ratings), Tension Meters (analog/digital instruments for measuring cable tension), Ratchet Wrenches (4-in-1 insulated wrenches), and Cable Peelers/Strippers/Cutters (insulation removal and cutting tools). The company also offers Hot Stick and Hot Puller tools for live-line operations. Products are used across power distribution, transmission, railway electrical lines, and telecommunication infrastructure. NAGAKI's tools are manufactured in Japan (Osaka headquarters factory, Aomori Rokkasho and Mutsu factories, Fukuoka Kyushu factory) and distributed to over 30 countries. The company holds ISO9001 and ISO14001 certifications for quality and environmental management.

Differentiator

Problem solved

Functional benefit

Brands

• NAGAKI Standard: Quality world standard for safety tools recognized in over 30 countries

Products and services

• Ratchet Puller (ハルー張線器) Wire-, belt-, and chain-type tensioning tools for pulling electrical cables and wires used in distribution, transmission, and train electrical line applications. Uses a ratcheting mechanism to reach high pulling loads with minimum time and effort. Available in capacities from 0.5t to 6t across wire, belt, and chain models.
• Wire Grip / Kamura (カムラー掴線器) Professional cam-operated wire gripping tools with safety cover and replaceable cam teeth, designed for steel rod, copper cable, messenger wire, aluminum cable, and live-line applications. Wide gripping range and one-touch attachment to cables, with models from 0.5t Mini Grip up to 10t Grip capacity.
• Tension Meter (テンションメータ) Analog and digital tension measuring instruments for cable tension management, available from 1KN (100kg) to 100KN (10t) capacity. Features compact size, lightweight design, and high durability for overhead line tension control.
• Benri Latch Insulated Ratchet Wrench (ベンリィラッチ) 4-in-1 insulated ratchet wrench for quick bolt and nut tightening and loosening. Socket slides to accommodate four different sizes with one tool, eliminating tool changeover. Available in B-3 (standard), BS-3 (insulated), and BY-3 (heavy-duty) variants; the insulated model is tested for 1000V usage.
• Cable Peeler / Stripper (ホットハグラー、ムケル) Cable peeling and stripping tools for removing electrical wire insulation without damaging the core wire. Includes Cable Peeler (rotating spiral stripping for two diameters per unit) and Cable Stripper (single rotation stripping), compatible with various wire types and sizes including OC, OCW, OE, and CV cables, with replaceable blades.
• Cable Cutter / Kitter (キッター) Wire and cable cutting tools with insulated handles and a ratcheting mechanism for higher cutting strength. Enables safe and accurate cutting of copper and aluminum wires on live electrical lines.
• Hot Stick Tools Insulated tools attached to hot sticks for wire grappling, cutting, and cleanup operations. Indispensable for live-line construction and maintenance methods, used by all Japanese power companies and overseas utilities.
• Hot Puller Insulated pulling tool allowing safe work on live electrical lines without cutting off power. Cables are strung from both sides of the product for live-line cable cutting operations.
• NAGAKI Product Set (Grip + Puller + Tension Meter) Complete set solution combining wire grip, ratchet puller, and tension meter for safe cable pulling operations. Core product combination recommended for overhead line and distribution work.
• After-Sales Manufacturer Inspection and Replacement Parts Service Manufacturer periodic inspection services and replacement parts supply (chains, wires, belts, cams) to ensure continued safe operation of NAGAKI tools. Required periodic maintenance emphasized in official safety notices.

Quantifiable outcome

• Live-line work enables power maintenance without service interruption, reducing downtime for utilities and end consumers
• +2 more outcomes

Named customers6 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

One partnership is on record.

• 株式会社イング (Ing Co., Ltd.)minorOthersRelated/affiliated company of NAGAKI SEIKI. Listed on the sales office page with contact information. No specific partnership details provided.

Scale indicators5 records

Recent moves15 records

Expansion highlights5 records

Direct peers

• Bahco (Snap-on Incorporated): Swedish-origin professional hand tools brand now owned by Snap-on, offering wrenches, pliers, and cutting tools for industrial professionals. Bahco competes with NAGAKI in the global market for high-quality professional hand tools for infrastructure and industrial users.
• Knipex: German premium pliers and hand tools manufacturer serving professional electricians, including insulated tools for live-line work. Knipex competes with NAGAKI in the global market for high-quality, safety-certified electrician hand tools.
• TONE Corporation: Japanese manufacturer of professional hand tools, wrenches, and socket sets. TONE is a domestic Japanese competitor in the professional hand tool market with overlapping customer segments in industrial and infrastructure maintenance.
• Klein Tools: US-based manufacturer of professional-grade hand tools for electricians and linemen, including pliers, wire pullers, grips, and insulated tools. Klein is the most direct international comparable to NAGAKI in terms of serving utility and electrical construction professionals with safety-critical hand tools.
• Wiha Tools: German manufacturer of professional hand tools with strong expertise in insulated and VDE-certified tools for electrical work. Wiha is a direct competitor to NAGAKI in the insulated tools segment and shares the same professional electrician customer base.
• Greenlee (Emerson): Manufacturer of cable installation tools, wire pullers, conduit benders, and electrical construction equipment. Greenlee's wire-pulling and cable-installation product lines overlap directly with NAGAKI's ratchet pullers, wire grips, and tension meters.

Broad incumbents

• Snap-on Incorporated: Global leader in professional tools and equipment, serving automotive, industrial, and infrastructure customers. Snap-on's broad professional tool portfolio, including the Bahco brand, positions it as a broad incumbent against which NAGAKI competes in the Japanese and international professional tool market.
• Stanley Black & Decker: Global tool conglomerate owning brands including Stanley, DeWalt, Craftsman, and Lenox. While not a direct niche competitor, Stanley B&D owns Klein Tools' main competitor portfolio and represents the broad-incumbent model of consolidated professional tool brands that NAGAKI competes against for shelf space and procurement contracts.

Regional players

• Vessel Tools: Japanese manufacturer of professional-grade screwdrivers, bits, and hand tools. Vessel serves a similar Japanese professional customer base and competes in select overlapping categories such as insulated screwdrivers and precision hand tools.

Emerging players

• Teng Tools: Professional hand tool brand offering modular tool storage and high-quality wrenches, sockets, and screwdrivers for industrial professionals. Teng Tools is a smaller specialty competitor that overlaps with NAGAKI's professional infrastructure maintenance customer base, particularly in Europe and Asia.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/nagaki-seiki

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Subsidiaries1 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 NAGAKI SEIKI Co., LTD.