Standoffs, crucial components in electronics, machinery, and various assemblies, come in a wide array of sizes to suit diverse applications. Their size is typically defined by several key dimensions: length, body diameter, and thread size (for threaded standoffs).
Lengths can range from just a few millimeters for compact electronics, such as 3mm or 5mm, up to several inches (e.g., 1 inch, 2 inches, or even longer) for more substantial mechanical structures. Body diameters also vary significantly, from slender designs like 2mm or 3mm, often found in intricate circuit board layouts, to much thicker options of 10mm or more, providing greater stability and load-bearing capacity.
When it comes to threaded standoffs, thread sizes are standardized and common examples include M2, M2.5, M3, M4, and M5 for metric threads, and #4-40, #6-32, #8-32, and #10-32 for imperial threads. The choice of thread size depends on the mating screw or bolt and the required strength of the connection.
Beyond these core dimensions, standoffs can also vary in their head types (e.g., hex, round, knurled), and the presence of features like internal or external threads on one or both ends. Manufacturers offer a vast selection of standard sizes, and custom sizes can also be produced for specialized needs. The specific dimensions required will always depend on the mechanical and electrical constraints of the application.