Get reliable performance and safety with our Residential Garage Door Extension Hardware Kits — engineered to support extension spring systems on standard homes. These professional-grade hardware boxes come complete with essential brackets, pulleys, rollers, cables, and installation hardware — available in 7′ single wide, 7′ double wide, 8′ single wide, and 8′ double wide options to suit your door size and requirements.
What’s Included (By Variation)
🔹 7′ Tall – Single Wide (EXTBX7S)
Perfect fit for a 7′ high single garage door with extension spring setup. This kit includes:
• Jamb brackets and bottom brackets
• 11-ball nylon rollers for smooth travel
• 3″ pulleys & fork assemblies
• Cables and rope
• Flag brackets and lift handle
• Assortment of bolts, screws, warning stickers, and installation instructions
• All necessary hardware to support extension springs and safety containment
🔹 7′ Tall – Double Wide (EXTBX7D)
Designed for wider 7′ doors, this complete extension hardware box includes everything listed above, sized for double wide door span and weight — providing balanced support and smoother operation.
🔹 8′ Tall – Single Wide (EXTBX8S)
Optimized for 8′ high single garage doors, this extension spring hardware kit contains the same full set of components — configured to handle a taller door with reliable support, durability, and long-lasting performance.
🔹 8′ Tall – Double Wide (EXTBX8D)
Our most robust kit for 8′ tall double wide residential doors with extension springs, this box includes all the necessary pulleys, rollers, cables, brackets, and fasteners you need for safe, reliable operation on larger residential doors.
Key Features & Benefits
✅ Complete Extension Spring Hardware – Everything needed for a full install in one box — no last-minute parts to buy.
✅ Engineered for Residential Garage Doors – Designed for standard doors with extension spring systems.
✅ Smooth, Quiet Door Motion – Quality pulleys and nylon rollers reduce friction and noise.
✅ Safe and Reliable – Includes proper safety and containment hardware for extension springs.
✅ Options for All Door Sizes – Select based on your door height and width for a proper fit.
🛠 Why Choose This Extension Kit
Whether installing a new extension spring system or replacing worn components, these kits are built for ease of installation, balanced door operation, and long-term reliability, giving homeowners and professionals the confidence to complete the job right.
