About Don-Jo
About Don-Jo
Don-Jo Manufacturing has been producing American-made architectural hardware for more than four decades from its headquarters in Sterling, Massachusetts. The company built its reputation around problem-solving hardware accessories, particularly aluminum door reinforcers and mortise lock wrap solutions designed to retrofit and strengthen doors already in service rather than requiring full door replacement.
The current catalog spans bolts, latches, door controls, hinges, kick plates, and the protective wraps and reinforcers Don-Jo is best known for, serving commercial, institutional, and security-focused building applications. That focus on retrofit hardware makes Don-Jo a go-to source for facility managers dealing with worn mortise cylinders, damaged door edges, or latch areas that need reinforcement without a full hardware replacement project.
Don-Jo parts show up on commercial doors in schools, hospitals, and office buildings wherever a facilities team needs to reinforce or protect existing hardware rather than specify an entirely new door unit. On ChatMRO, buyers can search by Don-Jo part number or describe the door problem and get matched to the right reinforcement or wrap.
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Frequently asked questions
What does Don-Jo manufacture?
Don-Jo manufactures architectural door hardware accessories including bolts, latches, door controls, hinges, kick plates, and its well-known aluminum door reinforcers and mortise lock wraps. Its hardware is widely used on commercial and institutional doors.
How long has Don-Jo been in business?
Don-Jo Manufacturing has been producing American-made architectural hardware for more than 40 years from its Sterling, Massachusetts headquarters. The company's exact founding year is cited differently across sources, generally placed in the late 1970s to early 1980s.
What is a Don-Jo door reinforcer used for?
A Don-Jo door reinforcer is a retrofit plate that strengthens the area around a lock or latch on an existing door, preventing kick-in damage or lock failure without replacing the entire door. These reinforcers are commonly installed on commercial, institutional, and security-sensitive entries.
Does Don-Jo make hardware for both new construction and retrofit projects?
Don-Jo hardware is used in both contexts, but the company is particularly known for retrofit-focused products like mortise wraps and reinforcement plates that upgrade existing doors in service. That retrofit focus is a key differentiator from hardware brands that primarily serve new-construction specification.
How do I find the right Don-Jo part through ChatMRO?
Search by the Don-Jo part number from your existing hardware or describe the door type and problem you're solving, and ChatMRO will match it to the correct reinforcer, wrap, or accessory. Our RFQ form is available if you'd like our team to confirm the right finish and size.