Carbon Steel Phillips Flat Head Knurled Screw with Integrated Serrated Lock Washer – Anti-Loosening Fastener for Secure Mechanical & Electronic Assembly

This high-performance fastening component is a precision-assembled flat head screw with an integrated serrated lock washer, manufactured from durable carbon steel. The design combines manual fastening convenience with anti-loosening functionality, making it ideal for use in mechanical assemblies, electronic equipment, and other precision-engineered systems requiring stable, vibration-resistant connections.

Product Structure & Features:

Screw Section:

• Flat Round Head with Phillips Drive
  The head of the screw is flat and circular, featuring a precisely machined cross (Phillips) slot on the top surface. This allows for easy and reliable torque application using standard Phillips screwdrivers—ideal for both manual and powered installation.

• Smooth Cylindrical Shank
  The screw shank extends from the underside of the head, showcasing a standard cylindrical profile. The surface is smooth and ready for threading (if applicable), compatible with standard metric or custom thread specifications as needed.

Serrated Lock Washer Section:

• Integrated Circular Washer with Radial Teeth
  Tightly mounted just beneath the screw head, the serrated lock washer features sharp, evenly spaced radial teeth around its outer edge. These teeth are engineered to bite into the surface of the mating material during installation, significantly enhancing grip and preventing loosening due to vibration or thermal expansion.

• One-Piece Assembly
  The washer is firmly fixed to the screw, forming a single, inseparable unit. This design improves assembly efficiency and ensures reliable positioning and locking during installation.

Key Advantages:

• Combines fastening and anti-loosening in a single component

• Easy installation with Phillips screwdriver – no additional washer handling

• Carbon steel offers strong tensile strength and cost-effective durability

• Ideal for electronics, machinery, automotive components, panel mounting, and more

• Lock washer teeth improve mechanical engagement and resist back-out under dynamic loads

Our Manufacturing Capabilities

As a precision fastener manufacturer, we provide custom screw assemblies, including pre-attached washers, anti-loosening features, and special head or drive configurations.

Key Capabilities Include:

• Materials:

  • Carbon steel (standard & hardened grades)

  • Stainless steel (304, 316)

  • Brass, aluminum, alloy steel

• Processing Technologies:

  • CNC turning

  • Cold heading & thread rolling

  • Washer press-fitting & assembly

  • Knurling, slotting, serration cutting

  • Heat treatment & surface finishing

• Thread Standards Supported:

  • Metric (M3–M12, etc.), UNC, UNF, custom pitch

• Surface Treatments:

  • Zinc plating (clear, blue, black), phosphate, black oxide, anti-corrosion coatings

• Tolerance & Quality Control:

  • Dimensional tolerances: ±0.01 mm

  • Thread conformity per DIN/ISO/ANSI standards

  • 100% visual and mechanical inspection

  • Salt spray testing for corrosion resistance

• Production Volume:
  Small batch to mass production (OEM/ODM orders welcome)

Need anti-loosening screws with integrated lock washers for your assembly line?

We offer custom designs, rapid prototyping, and scalable production to meet your fastening requirements. Send us your drawings or samples, and we’ll provide a quick quotation and engineering consultation.