U-Drive Screws are specially designed screws that feature a round metallic head, and multiple starting threads. The main purposes of U-drive screws are to securely and permanently fasten components typically made of plastic or metal. The unique head design and threads enable the U-drive screw to provide a secure hold, and can be driven into the components through applied pressure. The U-drive screws are often used also for aesthetic appearances, as they present a smooth surface when completely inserted into the components.

U-drive screws (Hammer Drive Screws) are unslotted round head thread forming screws having multiple start threads with a large helical angle and an unthreaded pilot point. The fastener is case-hardened and must be harder than the mating part and is to be driven or hammered into a substrate (eg. plastics, sheet metals, or castings) for a quick permanent assembly. Requires an undersized pre-drilled or punched hole for maximum adhesion.

• Description: Round head metallic drive screw having multiple start threads of large helix angle, with a pivot.
• Applications & Advantages: For making permanent fastenings in metals and plastics, when forced into the work under pressure.
• Material: Steel: AISI 1016 - 1024 or equivalent steel.
• Heat Treatment: Quenched in liquid and then tempered by reheating to 650°F minimum
• Surface Hardness: Rockwell C45 Minimum
• Case Depth: No. 2 thru 6 Diameter - .002 - .007, Nos. 7 thru 12 diameter - .004 - .009, No. 14 diameter: .006 - .011
• Core Hardness: Rockwell C28 - C38
• For Use In: Drive screws shall produce mating threads without shearing of threads or fracture of the screw when driven into properly sized holes in test plates havind a Rockwell hardness of B70 to B85.