A Cross Hex Head Recessed Machine Screw with Washer Combination is a type of threaded fastener designed for mechanical assembly, featuring a specific head type, drive style, and an integrated washer. This combination design simplifies assembly by eliminating the need to handle a separate washer, ensuring it’s always present for optimal performance.

Key Characteristics:

• Head Type: Hex Head with a Recess (often a pan head with hex recess, or a flanged hex head with recess). The hexagonal shape allows for wrench or socket driving, providing high torque capabilities. The “recessed” aspect might refer to a specific design within the hex head itself or a misunderstanding of the common “cross recessed” drive type. More typically, it might be a Hex Flange Head (which acts as a built-in washer) with a specific cross-recess drive for additional driving options or if the hex drive is in the recess. Let’s assume the “recessed” refers to the drive style within the hex head, or perhaps an error in the naming and it’s a “Hex Flange Head” with a “Cross Recess” drive option. If it literally means a hex head with an *additional* cross recess, that’s a less common but possible hybrid drive.
• Drive Style: Cross (e.g., Phillips, Pozi-Driv). This refers to the indentation on the head designed to accept a corresponding screwdriver bit. The combination of a hex head and a cross recess offers dual driving options, providing versatility during installation.
• Thread Type: Machine Screw. These fasteners have uniform threads designed to mate with pre-tapped holes or nuts, creating a precise and strong connection in metal or plastic components.
• Integrated Washer: The screw comes with a washer permanently attached under the head. This “combo” or “SEMS” screw style ensures the washer is always in place, preventing loss during assembly and typically providing a specific function such as increased bearing surface, load distribution, vibration resistance, or electrical insulation depending on the washer type.

Common Washer Types in Combination Screws:

• Spring Lock Washer: Provides tension to resist loosening from vibration.
• Flat Washer: Distributes load over a larger area, protecting the surface and preventing embedding.
• External Tooth Lock Washer: Digs into the bearing surface and the screw head to prevent loosening, often used for electrical grounding.
• Internal Tooth Lock Washer: Similar to external tooth, but aesthetically cleaner.

Advantages:

• Increased Efficiency: Speeds up assembly by eliminating the need to manually place a separate washer.
• Reduced Parts Inventory: Simplifies procurement and stock management by combining two components into one.
• Improved Reliability: Ensures the washer is always present and correctly positioned, leading to more consistent joint integrity.
• Enhanced Fastening Performance: The integrated washer provides benefits like load distribution, vibration resistance, or surface protection.
• Versatile Driving: The combination of hex head and cross recess offers multiple driving options, useful in various assembly environments.

Typical Applications:

• Electronics assembly
• Appliance manufacturing
• Automotive components
• Sheet metal fabrication
• General machinery and equipment assembly where secure, efficient fastening with a washer is required.

This type of combination screw is particularly useful in high-volume production environments where efficiency and consistent assembly are critical.