Overview and Intended Use
The Festo VAME-XA-S-M4-30 screw set (manufacturer ID 8191747) is a replacement or spare-part kit designed for pneumatic valve systems that use M4 threaded fasteners. Each screw has a length of 30 mm and is made of stainless steel, with an internal hexagon socket (AF 2.5) for secure tightening. The set includes three screws, which is a practical quantity for small maintenance tasks or for keeping a few spares on hand.
These screws are intended for mounting applications where a reliable, corrosion-resistant connection is required. The moderate corrosion resistance class (CRC 2) means they can withstand typical industrial environments with occasional exposure to moisture or mild contaminants, but they are not suited for aggressive chemical or saltwater conditions.
Technical Specifications and Compliance
The VAME-XA-S-M4-30 screws have a nominal tightening torque of 1.4 Nm with a tolerance of ±15%. This specification is important for achieving consistent clamping force without damaging the threads or the valve body. Always use a calibrated torque wrench when installing these screws.
The screws are LABS (PWIS) conformant to VDMA24364-B1/B2-L, which is a critical requirement in paint and coating applications. This conformity ensures that the screws do not contain substances that could cause paint wetting defects, making them suitable for use in automotive and other finishing industries.
Materials are RoHS-compliant, and the screws are made of stainless steel, offering good durability and resistance to corrosion. The product weight is 8.3 g for the set of three, which is negligible for shipping and handling.
Installation and Handling Considerations
Each screw features an external M4 thread and an internal hexagon socket (AF 2.5). This design allows for secure engagement with standard hex keys, reducing the risk of cam-out and ensuring proper torque transmission. The 30 mm length is suitable for applications where a longer engagement depth is needed, such as when mounting components with thick flanges or spacers.
Because the screws are sold in a pack of three, it is advisable to order multiple packs if you are servicing several valves or if you want to maintain a small inventory. Always verify the thread size and length against your specific valve model before installation.
Material and Environmental Suitability
The stainless steel construction provides moderate corrosion resistance (CRC 2), which is adequate for most factory floor environments. However, if your application involves high humidity, frequent washdowns, or exposure to corrosive chemicals, you should consider a higher corrosion resistance class. The LABS conformity ensures that the screws will not interfere with downstream painting or coating processes, which is a common concern in automotive and appliance manufacturing.
Additionally, the RoHS compliance means these screws meet the European Union's restrictions on hazardous substances, making them suitable for use in equipment sold in regulated markets.
Ordering and Spare Parts Management
When ordering the VAME-XA-S-M4-30, use the manufacturer part number 8191747 to ensure you receive the correct item. This screw set is a genuine Festo accessory, designed to match the quality and performance of the original components. Keeping a few of these sets in your maintenance inventory can reduce downtime, as you will have the right fasteners on hand when needed.
Before installation, always consult your valve's documentation to confirm the required torque and any specific mounting instructions. Proper torque application is essential to avoid thread stripping or over-compression of seals.