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

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

Professional Fastener Solution with Dual Drive Technology

The Metallics Industries Machine Screw 1/4-20 x 1-1/4" delivers exceptional performance 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 Technology - Features both slotted and Phillips drive options in one head for maximum installation flexibility and tool compatibility
• 1/4-20 Thread Specification - Precision 20 threads per inch provide secure engagement and reliable holding power for professional applications
• 1-1/4" Length Design - Optimal length for standard electrical and mechanical assembly applications with proper thread engagement
• Round Head Profile - 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
• Professional Hardness Rating - Rockwell B70-B100 hardness ensures optimal strength without brittleness for reliable performance
• 60,000 PSI Minimum Tensile Strength - Engineered for demanding applications requiring high strength and reliability

Installation Versatility

• Dual Tool Compatibility - Works with both slotted and Phillips #3 drivers for maximum installation convenience
• Precision Threading - Machine thread design ensures consistent engagement with threaded holes and nuts

Technical Specifications

Thread Size: 1/4-20, Length: 1-1/4", Head Type: Round, Drive Type: Slotted/Phillips Combo, Driver Size: #3, Material: Steel Zinc (AISI 1006-1022), Finish: Zinc, Head Width: 0.443-0.472", Head Height: 0.16-0.175", 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, Weight: 1.775 lbs

Installation & Usage

1. Select appropriate driver tool - either slotted or Phillips #3 screwdriver based on installation preference
2. Align screw with pre-threaded hole or nut ensuring proper thread engagement
3. Begin threading by hand to prevent cross-threading and ensure proper alignment
4. Use driver tool to tighten screw, applying consistent torque for secure fastening
5. Verify proper seating of round head against mounting surface for optimal load distribution
6. Check final tightness to ensure secure connection without over-torquing

Professional Applications

Ideal for:

• Electrical Panel Assembly - Securing components, switches, and hardware in electrical enclosures and control panels
• Equipment Mounting - Fastening electrical devices, junction boxes, and conduit accessories to mounting surfaces
• HVAC System Installation - Assembling ductwork components, mounting brackets, and system hardware
• Plumbing Applications - Securing pipe supports, fixture mounting, and plumbing hardware assembly
• Industrial Machinery - Machine assembly, equipment maintenance, and component replacement applications
• Control System Mounting - Installing sensors, switches, and control devices in industrial environments
• Maintenance Operations - Equipment servicing, component replacement, and system upgrades
• Commercial Construction - General fastening applications in commercial and industrial building projects

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 excellent strength characteristics, while the zinc finish provides reliable protection against environmental factors. This combination ensures long-lasting performance in electrical, plumbing, and HVAC installations where reliability is critical.

Why Choose Metallics Industries Quality?

Metallics Industries pioneered combo drive technology in 1985, becoming the first fastener company in America to offer a complete line of combination drive 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 decades of engineering excellence. Trust Metallics Industries for proven solutions in electrical, plumbing, HVAC, and construction applications where professional-grade fasteners make the difference.