What does full mortise mean?

The hinge leafs sit in recesses cut into both the door edge and the frame, so the hinge sits flush when the door is closed. It is the most common hinge type on commercial doors.

How is this different from a plain butt hinge?

This one has two ball bearings in the knuckles, which reduce friction and wear on doors that open and close often. A plain hinge has no bearings and relies on metal-on-metal contact.

Is bright brass good for outdoor doors?

Brass holds up in sheltered spots but tarnishes and wears faster than stainless steel in wet or salty conditions. For exterior doors in harsh weather, stainless is the safer choice.

What is the US3 finish code?

US3 is the standard code for bright brass, a polished yellow-gold finish. It matches other US3 hardware such as knobs, kick plates and closers.

How many hinges come in a box?

The box quantity is three hinges, which covers a typical door installation.

Will it fit a standard door?

A 4-inch by 4-inch hinge is the common size for standard-weight commercial doors. Check that your door and frame are mortised for this size before ordering.