Metallics Round Head Combo Machine Screw 3/8-16 x 1/2" Steel Zinc Slotted Phillips

Metallics Industries Round Head Combo Machine Screw 3/8-16 x 1/2" Steel Zinc

Professional Dual-Drive Fastener Solution

The Metallics Industries Round Head Combo Machine Screw delivers exceptional versatility and reliability for electrical, plumbing, and HVAC applications. This steel zinc machine screw provides dependable fastening solutions designed for professional contractors, electricians, and industrial technicians, offering the proven quality and precision engineering that professionals trust from a leading manufacturer of electrical hardware and industrial fasteners.

Professional Features & Benefits

Dual-Drive Performance

• Combo Slotted/Phillips Drive Design - Two drives in one head provide maximum installation flexibility and tool compatibility for diverse field conditions
• Round Head Configuration - Professional round head design with 0.67-0.708" width provides secure bearing surface and finished appearance
• 3/8-16 Thread Specification - Precision 16 threads per inch deliver reliable holding power and smooth installation in threaded holes
• 1/2" Length Design - Optimal length for standard electrical and mechanical assembly applications

Material & Construction Excellence

• Steel Zinc Construction - AISI 1006-1022 steel with zinc finish provides corrosion resistance and durability for indoor applications
• Professional Hardness Rating - Rockwell B70-B100 hardness ensures consistent performance and prevents stripping during installation
• 60,000 PSI Minimum Tensile Strength - High-strength construction delivers reliable holding power for demanding professional applications

Installation Versatility

• Dual Tool Compatibility - Works with both slotted and Phillips drivers for maximum field flexibility and tool availability
• Precision Threading - Machine thread design ensures smooth installation and secure engagement in tapped holes

Technical Specifications

Thread Size: 3/8-16, Length: 1/2", Material: Steel Zinc, Material Standard: AISI 1006-1022, Finish: Zinc, Drive Type: Slotted/Phillips Combo, Head Type: Round, Head Width: 0.67-0.708", Head Height: 0.237-0.256", Hardness: Rockwell B70-B100, Tensile Strength: 60,000 PSI minimum, Phillips Recess Depth: 0.202-0.228", Phillips Recess Diameter: 0.374-0.387", Slot Depth: 0.117-0.155", Slot Width: 0.081-0.094", Pack Type: Jar, Weight: 2.91 lbs

Installation & Usage

1. Select appropriate tapped hole size for 3/8-16 thread specification
2. Choose slotted or Phillips driver based on available tools and access requirements
3. Insert screw into threaded hole and begin threading by hand to prevent cross-threading
4. Use appropriate driver to tighten screw, applying consistent torque for secure installation
5. Verify proper seating of round head against mounting surface for optimal bearing contact
6. Check final installation for proper thread engagement and secure fastening

Professional Applications

Ideal for:

• Electrical Panel Assembly - Securing components, terminal blocks, and mounting hardware in electrical enclosures
• Equipment Mounting - Fastening electrical devices, switches, and control components to panels and brackets
• HVAC System Installation - Mounting thermostats, control panels, and system components in heating and cooling applications
• Plumbing Hardware Assembly - Securing valve components, mounting brackets, and system controls in plumbing installations
• Industrial Equipment Maintenance - Replacement fasteners for machinery, control panels, and industrial equipment
• Commercial Construction - General fastening applications requiring reliable thread engagement and professional appearance
• Mechanical Assembly - Securing components in mechanical systems where dual-drive capability is advantageous
• Electrical Box Installation - Mounting electrical boxes, covers, and associated hardware in commercial and industrial settings

Steel Zinc Construction Advantage

The steel zinc construction provides excellent strength-to-weight ratio with corrosion protection suitable for indoor electrical and mechanical applications. The zinc finish offers reliable protection against moisture and environmental factors while maintaining the high tensile strength required for professional installations. This material combination ensures long-term performance in electrical, plumbing, and HVAC environments.

Why Choose Metallics Industries Quality?

Metallics Industries has been the pioneer in combo drive technology since 1985, being the first fastener company in America to offer a complete line of combination drive screws. Our commitment to precision manufacturing ensures consistent thread quality, accurate head dimensions, and reliable drive engagement. Each screw meets strict material standards and undergoes comprehensive quality testing to deliver the dependable performance that electrical contractors, plumbers, and HVAC technicians demand for professional installations and equipment assembly applications.