Phillips Pan Head Screws with Lock Washers Zinc Plated Spring + Flat Washer Included Anti-Loosening M4-M12

Secure assemblies against vibration with pre-assembled Phillips pan head screws. Includes spring & flat washer. Zinc plated steel, DIN 7985. For machinery, automotive & electronics. Custom sizes available.

Combat vibration loosening and ensure reliable, long-lasting connections with our **Phillips Pan Head Machine Screws with Pre-Assembled Spring and Flat Washers**. This complete fastener solution combines a **standard Phillips pan head screw (DIN 7985)**, a **flat washer** for load distribution, and a **spring (split) lock washer** for vibration resistance – all pre-assembled for your convenience. Manufactured from durable carbon steel with zinc plating, they are ready for immediate use in **machinery, automotive components, electrical panels, and general industrial assembly** where vibration or thermal cycling is a concern.

Primary Uses & Applications:

* Machinery assembly (motors, pumps, gearboxes, frames).
* Automotive components (brackets, engine bay accessories, trim).
* Electrical enclosures & control panels.
* Industrial equipment & conveyors.
* Appliance manufacturing (motors, compressors).
* HVAC systems & fans.
* General fabrication where vibration or thermal cycling occurs.

Surface Treatment/Finishes:
* **Zinc Plating (Yellow Chromate - Zn+Y):** Standard finish offering good corrosion resistance for indoor/industrial environments. Yellow aids identification. RoHS compliant. Applied to both screw and washers.
* **Alternative Platings:** Clear Zinc, White Zinc, Black Zinc, or Black Oxide available upon request.

How to Use:

1. **Prepare:** Ensure female threads (nut or tapped hole) are clean, undamaged, and compatible. The pre-assembled washers eliminate the need for separate washers.
2. **Align:** Position components. The screw passes through the clearance hole in the top component.
3. **Insert:** The flat washer contacts the bearing surface; the spring washer sits between the flat washer and the screw head.
4. **Drive:** Use the **correct size Phillips screwdriver/bit** (e.g., PH2 for M5/M6). Drive clockwise.
5. **Tighten:** Tighten firmly until the spring washer is moderately compressed (flattened). This provides the locking action. **Do not over-compress** the spring washer, as this reduces its effectiveness.
6. **Function:** The **flat washer** distributes load and protects soft surfaces. The **spring washer** applies constant tension, resisting loosening from vibration or thermal changes.