Metallics Machine Screw 1/4-20 x 1-1/2" Round Head Combo Steel Zinc

Metallics Industries Machine Screw 1/4-20 x 1-1/2" Round Head Combo Steel Zinc

Professional Dual-Drive Fastener Solution

The Metallics Industries Machine Screw 1/4-20 x 1-1/2" Round Head Combo 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 Drive Design - Features both slotted and Phillips drive options in one head for maximum installation flexibility and tool compatibility
• Round Head Configuration - 0.443-0.472" head width provides optimal bearing surface and professional finished appearance
• Precision Threading - 1/4-20 thread specification ensures reliable engagement and holding power for demanding applications
• Steel Zinc Construction - AISI 1006-1022 steel with zinc finish delivers superior corrosion resistance and durability

Installation Versatility

• Driver Compatibility - #3 driver size accommodates standard professional tools for efficient installation
• Optimal Length - 1-1/2" length provides secure fastening through multiple material thicknesses
• Professional Finish - Zinc coating meets professional standards for electrical and industrial applications

Quality Engineering

• High Tensile Strength - 60,000 psi minimum tensile strength ensures reliable performance under load
• Controlled Hardness - Rockwell B70-B100 hardness provides optimal balance of strength and workability

Technical Specifications

Thread: 1/4-20, Length: 1-1/2", Material: Steel Zinc, Material Standard: AISI 1006-1022, Finish: Zinc, Drive Type: Slotted/Phillips Combo, Driver Size: #3, Head Type: Round, Head Width: 0.443-0.472", Head Height: 0.16-0.175", Tensile Strength: 60,000 psi minimum, Hardness: Rockwell B70-B100, 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, Weight: 2.03 lbs

Installation & Usage

1. Select appropriate pilot hole size for 1/4-20 thread engagement in target material
2. Choose between slotted or Phillips drive based on available tools and access requirements
3. Insert screw through clearance hole and align with threaded hole or nut
4. Begin threading by hand to ensure proper thread engagement and prevent cross-threading
5. Tighten with appropriate screwdriver or bit, applying consistent torque for secure fastening
6. Verify proper seating of round head against surface for optimal load distribution

Professional Applications

Ideal for:

• Electrical Installations - Panel mounting, junction box assembly, conduit support brackets, and electrical enclosure fastening
• HVAC Systems - Ductwork connections, equipment mounting, control panel assembly, and ventilation component installation
• Plumbing Applications - Fixture mounting, pipe support brackets, valve assembly, and plumbing hardware installation
• Industrial Assembly - Equipment panels, machinery components, control systems, and industrial hardware mounting
• Construction Fastening - Metal framing connections, structural brackets, building hardware, and construction component assembly
• Maintenance Operations - Equipment repair, component replacement, system upgrades, and facility maintenance projects
• Commercial Projects - Building systems installation, infrastructure mounting, and commercial equipment assembly
• Precision Assembly - Applications requiring reliable thread engagement and professional finished appearance

Steel Zinc Construction Advantage

The steel zinc construction provides exceptional durability and corrosion resistance for demanding professional applications. The AISI 1006-1022 steel base material offers superior strength characteristics, while the zinc finish provides reliable protection against environmental factors. This combination ensures long-term performance in electrical, plumbing, and HVAC installations where reliability and corrosion resistance are critical.

Why Choose Metallics Industries Quality?

Metallics Industries has been pioneering innovative fastener solutions since 1985, when they became the first fastener company in America to offer a complete line of combo drive screws. Their commitment to precision manufacturing, quality materials and finishes, and reliable performance makes them the trusted choice for contractors and industrial professionals. With comprehensive product testing, superior material selection, and engineering excellence, Metallics Industries delivers dependable solutions for electrical, plumbing, HVAC, and construction applications that meet the demanding requirements of professional installations.