The **M6SDY-6-R** is a specific technical component part number, most commonly associated with **industrial machinery parts** or **precision mechanical fasteners** (specifically from manufacturers like MISUMI). Below is a detailed breakdown of its specifications and electronic/mechanical context. --- ### 1. Part Number Breakdown The part number follows a modular logic used in engineering catalogs: | Segment | Description | Detail | | :--- | :--- | :--- | | **M** | Thread Type | Metric thread | | **6** | Nominal Diameter | 6mm (M6) | | **SDY** | Product Series | Stepped Shoulder Bolt / Stripper Bolt | | **6** | Shoulder Length | 6mm length for the precision ground section | | **R** | Special Feature | Often indicates a "Reduced" head or a specific material/coating | ### 2. Technical Specifications This component is used as a high-precision guide or pivot point within electronic assembly jigs or mechanical enclosures. * **Thread Diameter:** M6 (Pitch usually 1.0mm) * **Shoulder Diameter:** Typically slightly larger than the thread (e.g., 8mm or 10mm depending on the series standard). * **Material:** Often high-carbon steel (SCM435) or Stainless Steel. * **Hardness:** Usually heat-treated to 33–38 HRC (for steel versions). * **Tolerance:** The "Shoulder" part is precision ground, often to an **h7 or f8 tolerance** to ensure smooth rotation or sliding. ### 3. Application in Electronics While the part itself is mechanical, it plays a critical role in the following electronic contexts: 1. **SMT (Surface Mount Technology) Fixtures:** Used to hold PCB stencils or carrier plates in place during high-speed pick-and-place operations. 2. **Electronic Enclosures:** Acts as a captive screw or a pivot for hinged panels in server racks or control boxes. 3. **Automated Testing Equipment (ATE):** Provides a precise mechanical stop or guide for "bed-of-nails" testers to ensure the probe pins align perfectly with the PCB pads. 4. **Heat Sink Mounting:** Sometimes used as a spring-loaded shoulder screw to provide constant pressure on a CPU/GPU thermal interface. --- ### 4. Critical Dimensions Comparison If you are looking for a replacement, ensure the following dimensions match your technical drawing: | Feature | Dimension | | :--- | :--- | | **Shoulder Diameter (D)** | Precision fit (Critical for alignment) | | **Shoulder Length (L)** | 6mm (Determines the "gap" or height) | | **Thread Length (E)** | Usually 1.5x to 2x the thread diameter | | **Drive Type** | Hex Socket (Allen key) | ---