Based on technical databases and industry specifications, the part number **21-0108** is most commonly associated with specialized electronic components and interconnect hardware. Depending on the manufacturer (such as **Southco** or **Raychem/TE Connectivity**), its function varies. Below is a breakdown of the two most common components identified by this part number: --- ## 1. Southco 21-0108 (Electronic Enclosure Fastener) This is a precision-engineered **Standoff/Captive Screw** assembly used primarily in server racks, telecommunication hardware, and electronic enclosures. ### Technical Specifications | Feature | Description | | :--- | :--- | | **Component Type** | Captive Screw / Standoff | | **Material** | Stainless Steel or Carbon Steel (Zinc Plated) | | **Thread Size** | Typically M3 or 4-40 (depending on variant) | | **Function** | Secures PCB to chassis while preventing screw loss | | **Installation** | Press-in or Flare-in | ### Application in Electronics * **PCB Mounting:** Used to elevate Printed Circuit Boards above a metal chassis to prevent short circuits. * **Modular Hardware:** Allows for easy removal of modules in a blade server or networking switch without losing the fastening hardware. --- ## 2. Raychem / TE Connectivity 21-0108 (Wiring/Interconnect) In the context of aerospace and high-reliability electronics, this number often refers to specialized **shielded cabling** or **heat-shrinkable components**. ### Key Features * **High-Temperature Resistance:** Designed to operate in environments from -55°C to +150°C. * **EMI Shielding:** Often features a braided shield to protect sensitive electronic signals from electromagnetic interference. * **Standard Compliance:** Usually meets MIL-SPEC (Military Specification) standards for signal integrity. --- ## Summary Table | Category | Industry | Primary Use | | :--- | :--- | :--- | | **Mechanical/Electronic** | Data Centers / IT | Enclosure assembly and PCB mounting. | | **Interconnect** | Aerospace / Defense | Signal transmission in high-interference areas. | | **Automotive** | Vehicle Electronics | Sensors or wiring harness clips. | --- ### Which one are you looking for? To provide more specific data (such as a pinout diagram or torque rating), please specify if this part is a **mechanical fastener** for an electronic rack or a **cabled component**.