Klein

What Klein does

KLEIN is a privately held architectural hardware manufacturer specializing in interior space partitioning systems, founded in 1931 and headquartered in Montcada i Reixac, Barcelona, Spain, with a North American operations office in East Rutherford, New Jersey. The company's product portfolio comprises proprietary sliding, folding, swing, and exterior enclosure hardware systems, organized around named product lines including the NATURE wooden sliding door system with concealed mechanisms, the SK GLASS sliding glass system with proprietary KBS closure, the EXTENDO telescopic glass hardware, and the LITE PAR & FOLD compact multi-leaf folding hardware. KLEIN also offers component-level products such as tracks, kits, and closet door hardware.

The business operates a direct-to-professional model: architects, designers, and installers access technical resources, download specifications and technical drawings via a specs tool, and request quotes through the company website. Revenue is generated through hardware system sales delivered as complete kits for professional installation. Customer references span hospitality (Moods Catedral Hotel, Houghton Hotel), commercial coworking (OneplaceBCN), and government social housing — the latter being a finalist for the Mies Van der Rohe Architecture Award. Marketing is concentrated in content via the website, an email newsletter, and a dedicated professional portal with installer services. Distribution is global, anchored by the European manufacturing facility and the US regional office, with no disclosed external investors, funding rounds, or public listing.

Name

Klein

Legal name

Klein

Website

https://klein-usa.com

Company type

Private

Founded year

1931

Operating status

Operating

Headcount range

1–10 employees

Short description

KLEIN is a 1931-founded Spanish architectural hardware manufacturer producing proprietary sliding, folding, swing, and exterior enclosure door systems, sold directly to architects, designers, and professional installers globally through request-for-quote specifications and project sales.

Ownership category

akta.pro rank

Product category

Architectural Door Hardware

NAICS

Metal Window and Door Manufacturing (332321)

SIC

Partitions, Shelvg, Lockers, & Office & Store Fixtures (2540)

akta.pro primary industry

Architectural Hardware & Door Controls (Hinges, Locks, Closers, Panic Devices) (IMADAIAI)

akta.pro secondary industry

Interior Doors (IMADAIAB)

Keywords

• Sliding door hardware
• Interior partition systems
• Folding door hardware
• Door hardware manufacturing
• Architectural door systems

Headquarters

HQ city

East Rutherford

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Hardware systems sales: KLEIN generates revenue through the sale of interior partition hardware systems including sliding doors, folding doors, swing doors, and exterior enclosures. Products are sold as complete systems with mechanisms and tracks for professional installation.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Klein designs and manufactures hardware systems for interior architectural space partitioning, including sliding door systems (NATURE, SK GLASS, EXTENDO), folding door hardware (LITE PAR & FOLD), swing door hardware, and exterior enclosures, along with kits, tracks, and closet door hardware. Products are sold as complete systems with mechanisms and tracks for professional installation, marketed to architects, designers, and installers through a request-for-quote model on the company website, supported by technical advice and a specs tool for downloading technical drawings.

Product overview

KLEIN is a hardware manufacturer specializing in interior architectural space partitioning systems. The company offers a unified portfolio of door hardware products comprising sliding door systems (NATURE System, SK GLASS Hardware, EXTENDO), folding door solutions (LITE PAR & FOLD), and swing door hardware, complemented by exterior enclosure options and component-level products including kits, tracks, and closet door hardware. Since 1931, KLEIN has focused on designing and manufacturing systems for sliding, folding, and hinged doors with emphasis on durability, functionality, and aesthetics. The product line supports various track configurations including exposed, concealed, corner, and telescopic options. KLEIN also provides professional services including technical advice and a specs tool for architects, as well as installer tools and resources.

Differentiator

Problem solved

Functional benefit

Products and services

• NATURE System Wooden sliding door system with concealed mechanisms designed to let wood material take center stage. Features easy installation and ultra-smooth gliding action for dividing interior architectural spaces with natural elegance. Sold to architects, designers, and installers for residential, hospitality, and commercial projects.
• SK GLASS Hardware Sliding glass door system with a profile without holes for walls and ceilings, featuring KBS closure option for optimal durability and performance. Marketed as 'Elegance and Durability within everyone's reach.' Sold to architects, designers, and installers for glass door partitioning projects.
• EXTENDO Telescopic sliding glass door hardware with synchronized movement that creates wide openings for interior space partitioning. Sold to architects, designers, and installers for projects requiring expansive opening solutions.
• LITE PAR & FOLD Klein's most discreet and compact hardware for 2, 3, 4, and 5-leaf folding doors, enabling flexible interior space organization with miniaturized form factor. Sold to architects, designers, and installers.
• Swing Doors Hardware Hardware systems for traditional swing door installations that complement Klein's sliding and folding door portfolio. Sold to architects, designers, and installers for residential, hospitality, and commercial interior door applications.
• Exterior Enclosures Hardware Hardware solutions for exterior enclosure applications that extend Klein's interior partitioning capabilities to outdoor spaces. Sold to architects, designers, and installers.

Named customers4 records

Segments4 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators2 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• GEZE: German manufacturer of door, window, and safety technology including sliding and folding door systems for commercial and residential projects. Comparable product offering and European heritage, with stronger commercial building automation portfolio.
• Sugatsune: Japanese specialty architectural hardware manufacturer with premium sliding, folding, and pocket door systems. Comparable niche focus on design-forward hardware for architects, with similar proprietary mechanism development approach.
• Häfele: German-headquartered architectural hardware manufacturer with a global footprint and a deep catalog of sliding, folding, and swing door hardware. Directly comparable product offering and similar B2B architect/installer go-to-market approach, but operating at significantly larger scale.
• Blum: Austrian family-owned manufacturer of furniture fittings and architectural hardware including sliding door systems. Comparable family-owned specialty hardware structure, European heritage, and emphasis on concealed mechanism innovation.
• Linnea: Specialty manufacturer of sliding door hardware and systems for residential and commercial applications. Directly comparable niche focus on sliding/folding door mechanisms with similar target market of architects and installers.
• Hettich: German family-owned hardware manufacturer specializing in furniture and architectural sliding/folding door systems. Comparable in product category, family-owned/privately-held structure, and European heritage, though with broader furniture hardware exposure.

Broad incumbents

• ASSA ABLOY: Swedish-listed global leader in door opening solutions with extensive architectural hardware portfolio. Relevant comparable as a broad incumbent covering sliding/folding door hardware among much larger locks, access, and entrance automation offerings.
• Allegion: US-listed major player in door hardware, locks, and access control with significant commercial specification presence. Relevant comparable as a North American incumbent that Klein must compete against for US architectural specifications.
• dormakaba: Swiss-listed global leader in door hardware, access control, and entrance systems. Overlaps Klein in sliding/swing door mechanisms but operates at far larger scale with full commercial access solutions, making it a broad incumbent rather than direct niche competitor.

Emerging players

• AD Systems: North American specialty provider of sliding and pocket door systems targeting commercial architectural specifications. Comparable niche in sliding door hardware with stronger North American specification presence but smaller scale than Klein.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights5 records

Customer concentration

• Xx.com/KleinDoors
• Facebookfacebook.com/KleinUSA
• LinkedInlinkedin.com/company/klein-usa---sliding-door-systems

Revenue estimate

Valuation estimate

Number of profiles

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 Klein