Robyn Buck
Round head drive screws, also known as U-drive screws, hammer drive screws, or unslotted round head screws, are designed for heavy-duty fastening applications. They feature a round, unslotted head style and are constructed from steel or stainless steel. Round head drive screws are commonly used for attaching nameplates, wall signs, and pipe clamps, and are known for their strength and durability.
| Characteristics | Values |
|---|---|
| Head Style | Non-countersunk |
| Head Shape | Round |
| Drive Style | U-drive, Hammer drive |
| Thread Type | Multiple start threads with large helical angles |
| Pilot Point | Unthreaded |
| Installation | Driven into mating parts with a mallet, hammer, or hammer-drive device |
| Tapping Threads | Not required |
| Pilot Hole | Required |
| Material | Must be harder than the mating parts |
| Typical Applications | Attaching nameplates, wall signs, and other similar applications |
What You'll Learn
Hammer drive screws
To install hammer drive screws, you will need to drill an undersized pilot hole, as no tapping threads are required in the mating part. The U-drive screw must be made of harder material than the mating part and can then be driven in with a mallet, hammer, or hammer-drive device for quick and permanent assembly.
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U-drive screws
Round head U-drive screws, also known as hammer drive screws or unslotted round head screws, are designed for heavy-duty fastening applications. They feature a round, unslotted head, multiple start threads with large helical angles, and an unthreaded pilot point.
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Unslotted round head screws
Round head drive screws, also known as U-drive screws, hammer drive screws, or unslotted round head screws, are designed for heavy-duty fastening applications. They feature a round, unslotted head style, multiple start threads with large helical angles, and an unthreaded pilot point.
To use an unslotted round head screw, an undersized predrilled pilot hole is required, and the screw must be made of harder material than the mating parts. They are available in a variety of sizes, lengths, and materials, including black oxide-coated, zinc-plated steel, and stainless steel.
Unslotted round head machine screws are also available in different sizes and finishes. For example, Blacksmith Bolt & Rivet Supply offers 1/4"-20 X 3/4" unslotted round head machine screws in plain and black oxide finishes, while 5/16"-18 X 1" unslotted round head machine screws are available in black oxide, copper plate, and nickel plate finishes.
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Round head type U
U-drive screws feature a rounded head style and unique construction that make them strong and durable. They possess multiple start threads with large helical angles and an unthreaded pilot point. Similar to nails, they are driven into mating parts with a mallet, hammer, or hammer-drive device for quick and permanent assembly. No tapped threads are required in the mating part, but an undersized pre-drilled pilot hole is necessary, and the U-drive screw must be made of harder material than the mating part.
When using round head type U drive screws, it is important to note that they are not recommended for use in materials with a hardness greater than Rockwell B65. Additionally, the screws should be quenched in liquid and then tempered by reheating to a minimum of 650°F.
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Zinc-plated steel drive screws
Round head drive screws, also known as U-drive screws, hammer drive screws, or unslotted round head screws, are designed for heavy-duty fastening applications. They feature a unique construction that makes them strong and durable, ensuring long-lasting strength. These screws are commonly used for attaching nameplates, wall signs, and similar applications.
When selecting zinc-plated steel drive screws, it is important to consider the appropriate size and length for your specific application. They are available in a range of sizes, lengths, and thread types, making them versatile for different projects. Additionally, they can be purchased in packs of various quantities, such as 100, to suit your project needs.
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Frequently asked questions
Round head drive screws, also known as U-drive screws, hammer drive screws, or unslotted round head screws, are designed for heavy-duty fastening applications. They feature a round, unslotted head, multiple start threads with large helical angles, and an unthreaded pilot point.
Round head drive screws offer strong and durable fastening, making them ideal for long-lasting applications. They are commonly used for attaching nameplates, wall signs, and similar applications. Additionally, they can be driven into a broad range of materials, including ferrous and non-ferrous castings.
Round head drive screws are typically installed using a mallet, hammer, or hammer-drive device. They require an undersized pre-drilled or punched hole in the mating part, and the screw must be made of a harder material than the mating part.
Round head drive screws are available in various materials, including black oxide-coated steel, zinc-plated steel, 18-8 stainless steel, and 316 stainless steel.
