A4 Stainless Steel Shoulder Spring Screws - M3 - Phillips Drive - Pre-assembled Spring - Corrosion Resistant

Premium A4-80 (316) stainless steel shoulder spring screws. Long shoulder, Phillips drive, pre-assembled spring. Passivated finish. For marine, food, medical, & chemical equipment. Custom specs.

Engineered for the most demanding environments, our **A4 Stainless Steel Shoulder Head Spring Screws** offer superior corrosion resistance combined with the functional benefits of a guided shoulder and spring load. The entire assembly—screw, precision shoulder, and spring—is manufactured from **A4-80 (316) Stainless Steel** and finished with a **passivation** treatment to maximize its innate resistance to rust, chemicals, and salt water. The **34mm length with a long ~22mm shoulder** is ideal for applications requiring alignment, easy assembly, and reliable performance in harsh conditions, from marine equipment to food processing machinery.

Primary Uses & Applications:

* **Marine & Offshore:** Securing panels, instruments, and guards on boats and platforms where salt spray and corrosion are constant challenges.
* **Food & Beverage Processing:** Mounting components on machinery that requires frequent wash-downs with corrosive cleaners and must meet hygiene standards.
* **Medical & Laboratory Equipment:** Used in devices where corrosion resistance, cleanability, and reliable performance are non-negotiable.
* **Chemical Industry:** Applications with exposure to chemical vapors or splashes where component alignment is also needed.
* **Outdoor & Architectural:** Securing fittings and panels on outdoor structures or in humid environments.

How to Use:

1. **Galling Prevention:** **Crucial Step.** Apply a **stainless-steel specific anti-seize compound** to the **threads only** before installation to prevent galling (thread cold-welding).
2. **Insertion:** Insert the smooth shoulder through the clearance hole in the top component. Ensure the hole is clean and deburred.
3. **Driving:** Use a **high-quality PH2 bit** to avoid cam-out. Drive the screw at a **moderate, steady speed** to minimize heat and friction.
4. **Tightening:** Tighten until the spring is appropriately compressed and the assembly is secure. The shoulder guides the screw and prevents side load on the threads.
5. **Final Check:** Ensure the assembly moves as intended (floats/pivots) without binding. The spring should compensate for thermal expansion and vibration.

Our advantages:

1. More than 20 years of screw production experience and non-standard screw custom development experience, provide you with cost-effective screws, and help you solve the fastener supply chain.
2. Precise production equipment. The company introduces all imported equipment from Taiwan to produce precision screws and hardware accessories for you. Provide free sample testing for compatibility verification.
3. A complete management system, each batch of products that leave the factory undergoes multiple strict monitoring

4. Dedicated account management for seamless collaboration. System- supporting services guarantee you peace of mind.

Support and Services:
1. If you require technical support or have any questions regarding our Spring Screws product, our team of knowledgeable professionals is here to assist you. We provide comprehensive support services for all aspects of our Spring Screws. From selection advice to ensure you have the right type and size for your project, to guidance on proper installation techniques, we’ve got you covered.

2. Our support services include detailed product specifications, material safety data sheets, and step-by-step installation guides. We also offer troubleshooting assistance for any issues that may arise during the use of our Spring Screws. Whether you're a seasoned professional or a DIY enthusiast, we're committed to providing the support you need to ensure your project's success.

3. For maintenance tips and best practices, our experts are on hand with valuable advice to extend the life and maintain the performance of our Spring Screws. We are dedicated to providing exceptional customer support and ensuring that our products meet the highest standards of quality and reliability.

Packing and Shipping:
1. Our Spring Screws are packaged with care to ensure they arrive at your location in perfect condition. Each pack contains a specific number of rivets, securely held within a durable, moisture-resistant plastic bag. This bag is then placed inside a sturdy cardboard box, cushioned with packing materials to prevent anymovement during transit.

2. The boxes are sealed and labeled with product information, including the quantity and size of the rivets, for easy identification. For larger or bulk orders, multiple boxes are placed onto a pallet, shrink-wrapped, and strapped securely to minimize the risk of damage.

3. We ship our Spring Screws using reliable courier services to ensure timely and safe delivery. Tracking information is provided for every shipment, allowing you to monitor the progress of your order until it reaches your doorstep.

Our factory is able to accept customized drawings. To strike a balance between technical details and customer-centric messaging, please let us know if you need to tweak the description to highlight specific certifications or other parameters!