The BHMA® product numbering system is a standardized method used to identify and classify builders’ hardware products. Each ANSI/BHMA standard includes an explanation of the product numbering code specific to that category of hardware. The system uses a five-digit number preceded by a prefix letter, for example, B52131.
- The prefix letter indicates the BHMA Product Section responsible for the hardware.
- The first numeral denotes the base material of the product. The default number ‘0’ allows manufacturers to use an optional material that meets the standard’s performance requirements.
- The second number identifies the type of product.
- The third and fourth numerals specify the function of the item.
- The fifth number indicates the product’s performance grade.
For instance, using the example B52131:
- B = Product Section for cabinet hardware hinges
- 5 = Stainless steel
- 2 = Cabinet knob
- 13 = Back mounted
- 1 = Grade One
Thus, the product is a Grade 1, back-mounted stainless steel cabinet knob. The specific meanings of the numerical codes (e.g., 13 = back mounted) can be found in the relevant ANSI/BHMA standard, such as A156.9 for cabinet hardware.
To ensure clarity and consistency, it is recommended to specify building hardware products by their BHMA® product number, avoiding confusion over brand names, performance standards, or product grades.