Hex Head SEMS Screws.

What are Hex Head SEMS Screws?

Hex head SEMS screws are advanced integrated fasteners that combine a hexagonal bolt with one or more captive washers, typically a flat washer, spring washer, or both. These SEMS screws merge the functionality of a hex head bolt and the convenience of attached washers into a single unit, simplifying assembly and reducing the need for loose washers.

This unique design is particularly beneficial in high-speed manufacturing environments, such as electronics and automotive assembly, where precision component control and efficient assembly are crucial.

How Hex Head SEMS Screws Work

Hex head SEMS screws function by retaining the washers on the screw shaft during the production process. This ensures the washers stay in place throughout handling and installation, eliminating the need for separate washer alignment and reducing assembly time.

The hexagonal bolt head offers a robust, high-strength profile, while the drive allows for secure torque application using sockets or spanners. This design makes hex head SEMS screws an excellent choice for confined or automated environments where reliability and efficiency are essential.

Materials Hex Head SEMS Screws Are Made From

Accu’s hex head SEMS screws are made from A2-50 stainless steel, a material known for its tensile strength and corrosion resistance, making it ideal for industrial and assembly-line applications. The captive washers are also crafted from A2 stainless steel, ensuring material compatibility, corrosion resistance and long-lasting durability.

Additionally, we offer pre-applied thread locking patches through our AccuLock range, further streamlining assembly tasks while improving resistance to loosening.

This combination of materials ensures our hex head SEMS screws maintain consistent performance in both indoor and outdoor environments, with strong resistance to oxidation and wear.

Sizes and Types of Hex Head SEMS Screws Available

Accu supplies hex head SEMS screws in metric thread sizes ranging from M4 (4mm) to M12 (12mm), with lengths between 8mm and 50mm. Each screw features a hexagonal bolt head that allows for easy installation using a standard wrench or socket tool.

The screws are designed to provide excellent load distribution and clamping strength, making them suitable for a range of precision assembly applications.

FAQs

Q: What makes hex head SEMS screws different from regular hex head screws?

A: The key difference is the integrated washer assembly. While standard hex head bolts require separate washers, hex head SEMS screws come pre-fitted with washers, reducing installation time and streamlining part management.

Q: Can hex head SEMS screws be used in high-vibration environments?

A: Yes, particularly when configured with spring washers. These washers provide additional resistance to loosening, making the screws ideal for use in dynamic or vibration-prone applications.

Q: Are hex head SEMS screws suitable for automated assembly?

A: Absolutely. Their integrated design reduces the number of components, simplifying automated assembly and improving toolpath programming for robotic systems.

Q: Can hex head SEMS screws be reused?

A: Yes, as long as there are no signs of damage. In most cases the screw itself can generally be reused, but the spring washer may lose its tension after repeated use and should be inspected for wear before reinstallation.

Bespoke Hex Head SEMS Screws Manufacture.

High precision, bespoke manufacture of Hex Head SEMS Screws to customer specification. State of the art facilities specialising in both small batch prototyping and large scale manufacture.