Dutch masters of steel since 1667
Dutch Masters of Steel since 1667
MHB SL30-ISO 2016 USA - Dover WD - Baltimore county, Maryland steel door
MHB SL30-ISO 2018 NL De Lier Big Green Egg steel doors
MHB SL30-ISO 2020 NL PV Recreatiewoning Haren steel lock case door

Ultra-slim steel doors

MHB’s steel doors are the most exclusive, aesthetically pleasing doors for your project. They are handcrafted in our in-house facilities from start to finish. Their robust, sharp-edged steel frames are uniquely durable and ultra-slim with a 30 mm (1 3⁄16″) profile. We strive for aesthetic perfection and the highest safety of our products. To ensure that your steel doors are impeccable, we carefully monitor our production practices from start to finish.


Last a lifetime

All our steel doors are weatherproofed up to Class 6A – 600 Pa following the NEN-EN 12208 standard. The thermal isolation of MHB doors is unprecedented thanks to the isolation system in our SL30-ISO® profile system. We incorporate micro-engineered, fully double rubber seals to all our doors. Combined with the use of a special wet seal for glazing, this lets you enjoy maximum comfort with minimum upkeep. Our doors are completed with a Qualisteelcoat surface treatment to make them last more than a lifetime.

MHB steel doors in the big green egg main office building

The extensive choice of door dimensions, configurations, and finishes with our exclusive MHB steel door handles offers you exquisite, one-of-a-kind doors that satisfy any need. Thanks to our unique SL30-ISO® solid steel profile system, our steel doors are available in immense standard dimensions of up to 3,2 by 1,3 meters (10′ 6″ by 4′ 3 1⁄4″). If you wish to have even larger doors, we can design and test them for your specific project. We guarantee swift on-site installation because we only accept size deviations up to 0.5 mm ( > 1⁄32″).


MHB steel doors are available with five locking configurations: lock case doors, floating lock case doors, French doors, lock mullion doors, and partial lock mullion doors.

3d rendering front view of MHB steel floating lock case doors

MHB Floating lock case doors

MHB’s floating lock case doors combine maximum security with remarkable aesthetic beauty. Ultra-slim 30 mm (1 3⁄16”) sightlines and beautifully concealed lock cases ensure an abundance of natural light inside. Our extraordinary floating lock case door finds its origins in a centuries-old design of a Swiss master blacksmith. Its elegance results from the combination of lock case placement and our ultra-slim SL30-ISO® profile system. Its unique construction requires our expert craftsmen to cut the glass using advanced laser cutting techniques and to place it around the lock case carefully.

MHB Lock case doors

MHB’s lock case doors allow you to make a modernist architectural statement. These iconic, robust doors combine the strength of steel with our renowned ultra-slim SL30-ISO® profile system. This wonderfully expressive door type is handcrafted by our craftsmen to guarantee the highest quality and attention to detail.

3d rendering front view of MHB steel lock case doors large
3d rendering front view of MHB steel partial lock mullion doors

MHB Partial lock mullion doors

Are you looking for a hybrid door? MHB’s partial lock mullion door is the ideal hybrid solution for your project. Inspired by our full range of door designs, we brought all their strengths into one door. The partial lock mullion door can be tailormade based on your demands and lets you experience exceptional freedom while being guaranteed our renowned ultra-slim sightlines, excellent insulation, and optimal security.

MHB French doors

If you desire seamless access to your indoor and outdoor living spaces, MHB’s French doors are the ultra-slim solution. Our exclusive MHB WML locking system guarantees secure locking as it has been engineered to fit the ultra-slim patented profile systems. The excellent insulating properties of our French doors maximize your comfort and your view.

3d rendering front view of MHB steel french doors
3d rendering front view of MHB steel lock mullion doors

MHB Lock mullion doors

MHB’s lock mullion door combines our distinctive ultra-slim design and a multipoint locking system. Our craftsmen were challenged to engineer a door with an aesthetic design and a high-tech multipoint locking system for maximum comfort and security. These doors are also suitable for panic locks.  Their SL30-ISO® profiles make them fully weatherproof.


MHB Floating lock case door product sheet
MHB Lock case door product sheet
MHB Partial lock mullion door product sheet
MHB French door product sheet
MHB Folding door product sheet
MHB Lock mullion door product sheet
MHB Pivot door product sheet
All downloads
Dutch Masters of Steel since 1667

Download request

Profile system / product

Selected Download: