Heavy Duty Concealed Butt Hinges Ul Fire Rated 20 90 180 Minute Satin Brass Alloy Steel Full Mortise Hidden Design Stealth Look For 1 3 4 Thick Doors 180 Degree One Way Swing Non Removable Pin Rock Solid Pro Grade
✔️ 20 90 180 minute UL rated hidden pivot door assembly
You get a set of heavy duty hidden hinges that slip right into your solid door frame for a totally flush finish. These work perfectly for back entrance doors, storage rooms, and property upgrades where you want zero visible hardware cluttering up the exterior.
✅ Handles door slabs sitting anywhere from 1.375 to 1.750 inches deep✅ Swings outward in a single straight motion hitting a full hundred eighty degree arc
✅ Locks into place with a riveted steel spindle that never pulls out
✅ Needs a complete cavity cut for a completely buried seamless profile
✅ Meets strict safety codes with certified twenty ninety or one eighty minute flame protection
✅ Centers rotation away from edges so nothing catches your fingers or sleeves
✅ Stays perfectly aligned after the initial mount without needing future tweaks
💡 How do hidden fire stop hinges hold up on thick wooden or metal entry frames during peak business hours?
You can count on these secret mounts, which are mighty handy for busy entryways, to keep heavy traffic doors moving smooth.
- Deep mortise cuts take the weight off exterior screws completely
- Rust proof alloy steel blocks warping even after years of daily pushing
- Fixed center spindles stay tight when crowds push through tight hallways
- Certified blaze ratings keep everything locked down during sudden power failures