What Is a Hex Serrated Flange Screw?

Hex Flange Serrated Screws offer the most locking force for protecting assembly, with the strength of a bolt and the holding power of a washer. They’re used to join two components together.

These fasteners go by various names including:

• Flange Bolts
• Flange Screws
• Frame Bolts
• Hex Washer Head Bolts
• Hex Washer Head Screws
• Locking Head Screws
• Whiz Lock Screws

There are two differences between screws and bolts. The first comes down to the method of measurement. When measured in inches, it’s called a “screw,” whereas using the metric system, it’s called a “bolt.” The verbiage is interchangeable however technically a screw goes into a tapped hole, whereas a bolt goes through a series of through holes. 

What’s the Difference Between a Hex Head Cap Screw and a Hex Flange Serrated Screw?

Standard Hex Head Cap Screws are identifiable by a flat flange like an attached washer that dissipates clamp load laterally around the screw’s head. Some have a built-in flange, while others have a hexagon shape over the entire head.

Both have a hexagonal head that extends beyond the surface. The flange under the head replaces the washer and distributes the load over a wider area.

The difference between Standard Hex Head Cap Screws and Hex Flange Serrated Screws comes down to the teeth underneath the flange. Hex Flange Serrated Screws have serrations, sometimes called teeth, found under the formed flange head, whereas Standard Hex Heads have a smooth surface. Both lock the assembly in place and are resistant to vibration. Whiz Lock Screws bite into the substrate, locking the screw in place.

​These screws work best when there isn’t a great deal of shear of tensile load.
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Both are applied and removed using a torque wrench. 

Are Hex Flange Serrated Screws Right for My Project?

They’re ideal fasteners for lighter-load jobs and are used in mounting metal-to-metal applications, such as installing sheet metal to a body frame.

Used in:

• Agricultural equipment
• Automobile assembly
• Commercial lawn equipment
• Construction
• DIY projects
• General Machinery
• Light truck assembly
• Machinery
• Robotics
• Small excavation

What’s the Difference Between a Large Flange Hex Serrated Screw and a Whiz Lock Screw?

​Large Flange Hex Serrated Screws are a bigger version of a Locking Head Screw with a larger flange and, therefore, the clamping load is vaster than traditional sheet metal fasteners. Large Flange Hex Serrated Screws are suitable for maintaining maximum clamping load and they also can patch holes in sheet metal.

Where Can I Find Hex Flange Serrated Screws for Sale?

​Kelly Industrial Supply, Inc. is offering a closeout sale on Hex Flange Serrated Screws with prices as low as .05 cents for 1/4-20x1/2 up to .49 cents for 1/2-13x2. 

Order Yours Today