Slot design limits the amount of torque that can be applied, making it less secure for high-tension applications The ‘binding’ type is a commonly used screw head type. It is an ideal choice for electrical applications; beneath the head is a prominent undercut area providing space for wire connections.

Button head machine screws have a domed top that protrudes above the fastening surface. Fillister (or Cheese) The obsolete Fillister head is higher with a correspondingly deeper slot. Fillister heads can be shaved and drilled. . TRUSS OVEN HEAD SCREWS Round head machine screws have a semi-elliptical top surface and a flat bearing surface. They are often preferred over the pan head because of its smooth surface and appearance. Truss Oval head machine screws have a countersunk head with a rounded top surface and a cone-shaped 82 degree bearing surface. The oval style is often preferred over a flat head in conical applications, or when a more decorative look is required. Oval undercut machine screws are similar to the standard oval head style except that the head is undercut 70% of its normal side height. The oval undercut style is standard in shorter lengths because it allows greater length of threads. PanDoes screw diameter include thread? Yes. As the names imply, the major diameter is the largest diameter of a screw. The minor diameter is the lower extreme diameter of the thread. Pitch diameter Truss heads are typically wider than the heads on other screws and have a slightly rounded surface. You’ll usually need truss heads when working with sheet metal and other projects that require large holes because the wide head prevents the truss screw from going through the hole. 8. Button Heads

Machinescrewheads come inbindingundercut, button, fillister, flat, indented hex, indented hexwasher, oval, pan, round, and truss. Machine Screw drive styles come in hex slotted/unslotted, one way tamper proof, phillips, phillips pin head, phillips/slotted combo, six-love, slotted, spanner tamper proof, andtriangularslotted. Bugle heads are used mainly on screws made for plasterboard and drywall. This shape is much like a flat screw head, except that, instead of an angle underneath the surface of the head, you’ll see a curved shape that can reduce damage to a surface. Waferhead screws are a countersunk head with a flat top surface and a cone-shaped bearing surface. The wafer's 70° conical under head area does not extend to the outer edge of the head, providing a bearing surface of 16° around the circumference of the under-head. Preferred head style for self-drilling screws. Provides the necessary bearing surface and flush fit in wood and softer materials. The head/shank fillet is contoured to strengthen the under head area. . Some screw drives are better than others at achieving the performance you need for your specific application. Also, remember that different screwdriver heads exist for a reason. For example, a square screw head – or Robertson screw head – needs a Robertson screwdriver, but a slotted screwdriver can handle slotted and one-way screws. For best results, always use the appropriate screwdriver. Pan head machine screws are available in different drives, such as slotted or Phillips. These screw-head profiles are low with a larger diameter than most screws. They also provide greater torque for securing and removing, due to the rim of the head, which is slightly raised. Hex head screwFillister machine screws have a rounded top surface, cylindrical sides, and a flat bearing surface. The greater side height is what distinguishes a fillister head from a pan head. A fillister machine screw is the preferred style for use in counterbored holes. This head style is commonly known as a cheese head style. Flat