1/4"-20x1-3/8" Slotted Round Head Machine Screw Clear Zinc Cr3 Plating

Machine Screw, Round Head Slotted, Zinc Cr3 Plating (Inch Sizes) 

Round head slotted machine screws with Zinc Cr3 plating in inch sizes are widely used fasteners in industrial, commercial, and consumer applications. These screws are designed for precision assembly where aesthetic appeal, corrosion resistance, and compatibility with standard screwdrivers are critical. The round head provides a smooth, domed appearance, while the slotted drive ensures easy installation and removal using a flat-blade screwdriver.

Specifications:

• Head Type: Round Head

• Drive Type: Slotted

• Thread Type: Unified Thread Standard (UNC/UNF) – Inch Sizes

• Material: Carbon Steel 

• Plating: Zinc Cr3 (Clear Chromate)

  • Offers moderate corrosion resistance

  • Environmentally friendly alternative to Cr6 plating

• Available Sizes:

  • Diameter: #2 through 1/2"

  • Lengths: 1/8" to 3" or more, depending on diameter

• Standards Compliance: Typically conforms to ANSI/ASME B18.6.3

Applications:

Round head slotted machine screws are ideal for light to medium-duty fastening in pre-tapped holes or used with nuts. Common industries and uses include:

• Electronics & Electrical Equipment: For mounting panels, switch boxes, and terminal connections.

• Automotive Assembly: Used in dashboards, trim panels, and electrical enclosures.

• Furniture Manufacturing: Frequently used in knock-down (KD) assembly and wood-to-metal applications.

• Appliances & HVAC: Used in covers, brackets, and internal support structures.

• General Industrial Use: In machinery, equipment enclosures, and control systems.

The Zinc Cr3 coating adds an extra layer of protection against rust and oxidation, making these machine screws suitable for indoor and dry environments. Their simplicity, reliability, and broad availability in inch sizes make them a staple in fastening solutions.