3.5 Inch 1/4R Door Hinges from TDC—precision-engineered for residential and light commercial doors. Designed with a 1/4" radius corner for clean fits and fast installation, these hinges offer smooth performance and reliable strength. Available in multiple finishes, direct from our factory. Shop now or request a quote. 3.5" 1/4R Hinges – clean fit, smooth action, factory direct. Buy now or get a quote.