{"product_id":"best-access-fbb191-4-5-x-4-5-us32d-mortise-butt-hinge","title":"Best Access FBB191 4-5 X 4-5 US32D Mortise Butt Hinge","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe BEST ACCESS FBB191 4-5 X 4-5 US32D is a five-knuckle, ball-bearing, full mortise butt hinge finished in satin stainless steel (US32D) with a stainless steel base. At 4.5 inches by 4.5 inches, it falls into the standard-weight category, making it appropriate for commercial and institutional doors that see regular traffic. The ball-bearing knuckle construction reduces friction and wear over the life of the door, while the satin stainless finish provides corrosion resistance in demanding environments. Installation is handled by finish carpenters, commercial door hardware installers, and licensed locksmiths.\u003c\/p\u003e\u003cp\u003eThis hinge is intended for full mortise door applications where the leaf is recessed flush into both the door edge and the frame. The 4.5-inch by 4.5-inch leaf size suits standard commercial hollow-metal or solid-wood door builds. The US32D satin stainless finish is a common specification in healthcare, hospitality, and institutional construction where corrosion resistance and a low-glare appearance are required. It is also a frequent choice in coastal or high-humidity environments where plated steel hardware would degrade prematurely.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eFive-knuckle design provides smooth, even load distribution across the hinge barrel\u003c\/li\u003e\n\u003cli\u003eBall-bearing construction reduces operational friction and extends service life\u003c\/li\u003e\n\u003cli\u003eUS32D satin stainless steel finish offers strong corrosion resistance with a low-glare appearance\u003c\/li\u003e\n\u003cli\u003eStainless steel base material throughout for consistent performance in humid or corrosive environments\u003c\/li\u003e\n\u003cli\u003eFull mortise configuration allows flush installation into door edge and frame\u003c\/li\u003e\n\u003cli\u003eStandard-weight classification suitable for typical commercial door weight ranges\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or new-install full mortise butt hinge for standard commercial and institutional doors requiring a 4.5-inch by 4.5-inch leaf size in a US32D satin stainless finish.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified door hardware installer, finish carpenter, or licensed locksmith. Mortise pockets must be routed to the correct depth and leaf dimensions before fastening to ensure flush seating and proper door swing. Follow all applicable building codes, including fire-rated door assembly requirements when the hinge is used in a rated opening. Verify door weight and frequency ratings against the hinge specification sheet before finalizing the installation.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeaf Size\u003c\/strong\u003e: 4.5 inches x 4.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: US32D Satin Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase Material\u003c\/strong\u003e: Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKnuckle Count\u003c\/strong\u003e: Five\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearing Type\u003c\/strong\u003e: Ball Bearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight Class\u003c\/strong\u003e: Standard Weight\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHinge Type\u003c\/strong\u003e: Full Mortise Butt Hinge\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: BEST ACCESS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: FBB191 4-5 X 4-5 US32D\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BEST ACCESS","offers":[{"title":"Default Title","offer_id":67646082187570,"sku":"FBB191 4-5 X 4-5 US32D","price":41.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a6992fabc58d3d950a9f62037db24618.jpg?v=1790458817","url":"https:\/\/voomisupply.com\/products\/best-access-fbb191-4-5-x-4-5-us32d-mortise-butt-hinge","provider":"Voomi Supply","version":"1.0","type":"link"}