Experts in the OEM fenestration hardware industry
Interlock USA and Caldwell Manufacturing Company are now ASSA ABLOY Fenestration. Our integrated companies will continue to provide the best hardware solutions for windows, doors and beyond. To do this, we will leverage the combined strength of the people behind two great brands.
ONE team. Every solution.
Interlock USA and Caldwell Manufacturing Company are now ASSA ABLOY Fenestration. Our integrated companies will continue to provide the best hardware solutions for windows, doors and beyond. To do this, we will leverage the combined strength of the people behind two great brands.
Welcome to our new website!
We are thrilled to announce the official launch of our brand-new website: www.assaabloyfenestration.com
Our brands
ASSA ABLOY is a global organization with over 50,000 employees across more than 70 countries. Every day, we help billions of people move through a safer, more open world with ease.
ASSA ABLOY Fenestration defines our local area of expertise within our vast, global organization. Our company name distinguishes our team from other ASSA ABLOY companies.
The Interlock and Caldwell brands remain integral to our company as product brands. They preserve the proud heritage of the Interlock brand, founded in New Zealand in 1961, and the Caldwell brand, founded in Rochester, New York in 1888.
Products
Hung Window Solutions
Creating window balances since 1888. For more than 135 years, the Caldwell brand has specialized in enhancing the hung window balance industry, extending AAMA to Class 6 and developing easy solutions for every window type. Featuring Interlock's sash lock systems.Sliding Window Solutions
From inventing the first automatic sash lock system for vinyl windows to creating the only magnetically triggered sash lock on the market, the Interlock brand has pioneered the development of Sliding Windows Solutions in North America.Residential Casement & Awning Window Solutions
Interlock Casement & Awning Window Solutions are some of the most advanced hardware products available on the market today.Commercial Casement & Awning Window Solutions
Heavy duty MAGNUM® solutions for all commercial grade windows & doors. From MAGNUM® 4-bar hinges and OMNI DRIVE™ operators to revolutionary multi point locking systems, these solutions are engineered to optimize security, ease of operation and flexibility through their innovative features.Sliding Door Solutions
With a wide variety of solutions for single and multi-panel applications, the Interlock sliding door product line features an unparalleled selection of handle styles, smartly engineered locking solutions and the most versatile hardware availableSwing Door Solutions
Designed to fit single panel and French door applications, Interlock Swing Door Solutions feature single and Multi-Point Mortice locks in various configurations and with a variety of modern handle optionsFolding Door Solutions
Interlock Fold Door Hardware combines aesthetics with performance and versatility to create ideal solutions for the modern home.European Tilt & Turn Window Solutions
Interlock is proud to offer the complete range of products from Germany's leading manufacturers of European hardware solutionsTools
Tools to simplify hardware installation for all of our customers.Secondary Security
With a unique range of secondary security devices, Interlock products are designed to fit a variety of window and door applications and may also be retro-fitted.Explore more
About us
Find out more about ASSA ABLOY Fenestration and the history of our brands: Caldwell & Interlock
Support
Review our Patents List, Product Certificates, Limited Warranty & more.
Stories
ASSA ABLOY Fenestration latest stories
Catalogs
Multipoint Door Catalog
Product Catalog
Sustainability is integrated in everything we do
We care for our people and our planet. That’s why throughout our business process, we always remember to make a positive impact and make sure that we are working towards a sustainable future, every day.
Let's get in touch
Want to know more about our products and solutions, our service or have feedback to share? Welcome to send us an email or give us a call. Your questions and comments are important to us.