M3 STANDOFF SPACER

An M3 standoff spacer is a type of mechanical fastener used to separate two components in an assembly, typically a Printed Circuit Board (PCB) from a chassis or another PCB.

Here is a breakdown of the key elements:

• M3: This refers to the metric thread size, meaning the threads have a nominal diameter of 3 millimeters and a standard thread pitch of 0.5mm. This is a common size in small electronics and robotics.

• Standoff vs. Spacer: While the terms are often used interchangeably, there's a distinction:

  • Standoff: Typically a threaded separator. It can be Male-Female (external thread on one end, internal thread on the other), Female-Female (internal threads on both ends), or Male-Male (external threads on both ends). The threads allow the components to be securely fastened.

  • Spacer: Typically an unthreaded hollow tube or cylinder. It is held in place by the clamping force of a screw and a nut/surface passing through it.

• Function/Use:

  • Spacing/Elevation: They create a precise, fixed distance between components, preventing short circuits (especially with PCBs) and allowing room for airflow and component clearance.

  • Mounting: They provide a secure and stable way to mount components to a surface or stack multiple layers.

  • Isolation: If made from non-conductive materials like nylon, they can provide electrical isolation.

• Common Materials & Shapes:

  • Materials: Brass, Aluminum, Stainless Steel, Nylon, or Steel (often zinc-plated).

  • Shapes: Most commonly hexagonal (hex) for easy wrench tightening, but also round.