The part number **561-RIV012** typically refers to a specific type of mechanical fastener used in electronic assemblies. Specifically, this is a **Push-In Rivet** manufactured by companies like **Eagle Plastic Devices** (often distributed by Mouser Electronics). --- ### 1. Specifications Overview The 561-RIV012 is a nylon fastener designed for quick manual assembly of PCBs (Printed Circuit Boards), panels, and chassis components. | Feature | Specification | | :--- | :--- | | **Material** | Nylon 6/6 (UL 94V-2) | | **Hole Diameter** | 0.125" (3.18 mm) | | **Grip Range** | 0.062" to 0.156" (1.57 mm to 3.96 mm) | | **Head Diameter** | 0.250" (6.35 mm) | | **Color** | Natural (Off-white/Translucent) | | **Type** | Snap Rivet / Push Rivet | --- ### 2. Functional Purpose In electronic hardware design, these rivets serve several critical functions: * **PCB Mounting:** They are used to secure a circuit board to a metal or plastic chassis without the need for screws or nuts. * **Electrical Insulation:** Since they are made of Nylon 6/6, they provide excellent electrical insulation, preventing accidental shorts between the board and the mounting surface. * **Vibration Dampening:** The plastic material absorbs minor mechanical vibrations better than rigid metal screws. * **Tool-less Assembly:** They are designed to be "pushed" in by hand or with simple pressure, significantly speeding up production line assembly. --- ### 3. Mechanical Operation The 561-RIV012 operates on a **snap-lock principle**: 1. **Insertion:** The rivet is pushed through the aligned holes of the components being joined. 2. **Expansion:** As the center pin or the body is pressed, the "legs" of the rivet expand outward on the opposite side of the panel. 3. **Locking:** The expansion creates a permanent or semi-permanent friction lock that holds the layers together tightly. --- ### 4. Technical Considerations When using this part in a design, engineers must consider: * **Thermal Limits:** Nylon 6/6 has a melting point, so these should not be used in high-heat zones (e.g., directly next to high-wattage resistors or heat sinks). * **Hole Clearance:** The drill hole must be precise; if the hole is too large, the rivet will not grip; if too small, the nylon may shear during insertion.