Metallics Machine Screw 1/4-20 x 3/8" Round Head Combo Steel Zinc

Metallics Industries Machine Screw 1/4-20 x 3/8" Round Head Combo Steel Zinc

Professional Dual-Drive Fastener Solution

The Metallics Industries Machine Screw 1/4-20 x 3/8" Round Head Combo delivers exceptional performance and reliability for electrical, plumbing, heating and air conditioning 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
• 1/4-20 Thread Specification - Precision 20 threads per inch deliver secure fastening with consistent engagement and holding power
• 3/8" Length Dimension - Optimal length for standard electrical and mechanical assembly applications
• Round Head Configuration - Professional round head design with 0.443-0.472" width provides excellent bearing surface and finished appearance

Material & Construction Excellence

• Steel Zinc Construction - AISI 1006-1022 steel with zinc finish provides superior corrosion resistance and durability
• Rockwell B70-B100 Hardness - Engineered hardness specification ensures optimal strength and installation performance
• 60,000 PSI Minimum Tensile Strength - High-strength construction delivers reliable holding power for demanding applications

Professional Installation

• Versatile Drive Options - Compatible with both slotted and Phillips drivers for maximum tool flexibility
• Precision Threading - Machine thread design ensures consistent engagement and professional installation results

Technical Specifications

Thread Size: 1/4-20, Length: 3/8", Material: Steel Zinc, Finish: Zinc, Head Type: Round, Drive Type: Slotted/Phillips, Head Width: 0.443-0.472", Head Height: 0.16-0.175", Material Standard: AISI 1006-1022, Hardness: Rockwell B70-B100, Tensile Strength: 60,000 PSI minimum, Phillips Recess Depth: 0.121-0.147", Phillips Recess Diameter: 0.255-0.268", Slot Depth: 0.082-0.109", Slot Width: 0.064-0.075", Pack Type: Jar

Installation & Usage

1. Select appropriate pre-drilled or tapped hole matching 1/4-20 thread specification
2. Choose slotted or Phillips driver based on available tools and access requirements
3. Insert screw through components ensuring proper thread alignment
4. Begin threading by hand to prevent cross-threading and ensure proper engagement
5. Tighten with appropriate driver to secure connection without over-torquing
6. Verify proper seating and bearing surface contact for optimal holding power

Professional Applications

Ideal for:

• Electrical Installations - Panel mounting, junction box assembly, conduit fitting attachment, and electrical component securing
• HVAC Systems - Equipment mounting, ductwork connections, control panel assembly, and ventilation component installation
• Plumbing Applications - Fixture mounting, pipe support brackets, valve assembly, and plumbing hardware installation
• Industrial Assembly - Machine component fastening, equipment panel mounting, and mechanical assembly applications
• Construction Fastening - Metal framework connections, structural component assembly, and building system installations
• Equipment Maintenance - Replacement fastening for existing installations, repair applications, and component servicing
• Control Systems - Instrument mounting, control panel assembly, and automation equipment installation
• Commercial Applications - Building maintenance, facility upgrades, and professional installation projects

Steel Zinc Construction Advantage

The steel zinc construction provides exceptional corrosion resistance and durability for indoor and outdoor applications. The zinc finish offers superior protection against environmental factors while maintaining the strength characteristics of quality steel construction. This material combination ensures long-term performance in electrical, plumbing, and HVAC installations where reliability and corrosion resistance are essential.

Why Choose Metallics Industries Quality?

Metallics Industries has been the leader in combo drive fastener innovation since 1985, being the first fastener company in America to offer a complete line of combo screws. Our commitment to precision manufacturing, quality materials and finishes, and reliable performance for contractors and industrial professionals is backed by comprehensive product testing and engineering excellence. Trust Metallics Industries for proven fastener solutions that deliver consistent results in electrical, plumbing, HVAC, and construction applications, supported by decades of professional-grade manufacturing experience.