Fillister Head Machine Screws
Fillister Head Machine Screws for Low Torque Applications
Fillister head machine screws are nearly identical to binder heads, with their slightly rounded top and thick cylindrical flat head. However, the fillister design features a taller head. This style works well in low torque applications or where the flat head can protect the mating surface from tightening damage. They are often found in older components or directly next to raised surfaces, where head height does not pose an interference risk.
Machine screws, featuring a maximum diameter of 3/4 in. (per ASME standards) and flat ends with uniform threads, are highly versatile. They are widely used in machinery, electrical connections, assembly line machinery, and more. The variety of head styles supports specific installation methods, decorative designs, additional grip requirements, or surface profiles. They can be used with tapped holes or nuts, though nuts are optional. Typically, these screws are driven into pre-drilled holes using a drill or screwdriver. Huyett's offerings include the following head types:
- Binder Head: Thick cylindrical flat head with slightly rounded top
- Button Head: Rounded head with low profile
- Flat Head: Countersunk with straight standard angles and a flat head
- Hex Head: Six-sided flat head
- Oval Head: Countersunk with straight angles and a curved top
- Pan Head: Short sides with slightly rounded top
- Round Head: Rounded head with no vertical sides
- Truss Head: Short rounded head with a wide base
Product Benefits
Fillister head machine screws offer the following benefits:
- Counterbore Hole Compatibility: This head style is particularly useful in applications with counterbored holes and for low-torque applications.
- Surface Protection: The flat head helps keep the screw from digging into the mating surface during installation.
- Easy Access: The tall head makes the screw easier to access for installation, especially next to other raised surfaces.
Purchase Considerations
Evaluate the following product characteristics before making your purchase:
- Drive Type: Different head styles support different drive types, which affect how the screw will be installed and how it will tighten into the mating surface. Consider your installation and holding power needs before choosing a drive type.
- Thread Size: Ensure the mating hole supports the screw’s thread size.
- Material/Finish: These screws are available in materials and finishes that support a range of corrosion resistance and strength needs. Consider the application’s environment when evaluating how the screw will need to resist corrosion or hold up under the load.
