4 X15CM Machine Screw

The screw is commonly offered in steel, aluminum, and brass. Each material provides different levels of strength, weight, and corrosion resistance, so your choice depends on the application.

These machine screws are designed to offer improved tensile and shear strength and wear resistance. Exact strength varies by material and grade, so select the material that matches your load and environment requirements.

They’re suitable for industrial or commercial applications such as motors, engines, pumps, and various machine components where a secure, long fastener is required.

Consider the operating environment and load: steel for high strength, aluminum for lighter weight and corrosion resistance, and brass for good corrosion resistance and specific electrical properties. Match the material to durability, weight, and cost needs.

Align parts and use a nut or tapped hole as the mating surface. Pre-drill or prepare threads if needed, insert the screw, and apply appropriate torque or thread-locking compound if vibration is present. Use washers to distribute load when required.

Machine screws rely on nuts or threaded holes for engagement and are ideal for assemblies that can’t be riveted or welded. Washers distribute load and protect surfaces; locking features (like thread-locking compounds) help prevent loosening in vibration-prone setups.

Follow proper torque guidelines to avoid over-tightening, select corrosion-resistant materials for exposed environments, and ensure the thread form and engagement length match your mating components to maintain joint integrity.

Steel offers the highest strength, aluminum reduces weight, and brass provides good corrosion resistance and certain electrical properties. For reference, see these items on Fepy: Steel version - https://fepy.com/products/steel-machine-screw-4x15-inches, Aluminum version - https://fepy.com/products/aluminum-machine-screw-4x15-inches, Brass version - https://fepy.com/products/brass-machine-screw-4x15-inches

Assess material choice, diameter, length, and thread type in relation to your application’s strength requirements and cost. Compare material properties and price to choose the best balance of performance and value.

Confirm the diameter (the first number, 4 inches) and length (the second number, 15 inches). Also verify the thread form and pitch, and ensure compatibility with the nut or tapped hole you’ll use.

Reusability depends on material and threading condition. If threads are damaged, or if there’s noticeable wear or corrosion, it’s best to replace with a new screw to ensure reliable performance.