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

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

Professional Dual-Drive Fastener Solution

The Metallics Industries Machine Screw 1/4-20 x 2-1/2" 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 Slotted/Phillips Drive Design - Provides two drive options in one head for maximum installation flexibility and tool compatibility
• Round Head Configuration - Features 0.443-0.472" head width with 0.16-0.175" height for secure bearing surface and professional appearance
• Precision Threading - 1/4-20 thread specification with 20 threads per inch ensures reliable engagement and holding power
• Extended Length Design - 2-1/2" length provides versatility for thick material applications and through-bolt installations

Material & Construction Excellence

• Steel Zinc Construction - AISI 1006-1022 steel with zinc finish provides corrosion resistance and durability
• Professional Hardness Rating - Rockwell B70-B100 hardness ensures optimal strength without brittleness
• High Tensile Strength - 60,000 psi minimum tensile strength delivers reliable performance under load

Installation Versatility

• Dual Tool Compatibility - Works with both slotted and Phillips #3 drivers for maximum convenience
• Professional Packaging - Available in convenient jar packaging for organized storage and easy access

Technical Specifications

Thread Size: 1/4-20 (20 threads per inch), Length: 2-1/2", 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", 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", Hardness: Rockwell B70-B100, Tensile Strength: 60,000 psi minimum, Pack Type: Jar, Weight: 3.06 lbs

Installation & Usage

1. Select appropriate pre-drilled or tapped hole matching 1/4-20 thread specification
2. Choose between slotted screwdriver or Phillips #3 driver based on accessibility and preference
3. Insert screw through components ensuring proper thread engagement
4. Apply steady torque while maintaining driver alignment to prevent cam-out
5. Tighten to manufacturer specifications without over-torquing to preserve thread integrity
6. Verify secure fastening and proper component alignment upon completion

Professional Applications

Ideal for:

• Electrical Panel Assembly - Securing components, mounting hardware, and electrical enclosure assembly
• HVAC System Installation - Ductwork mounting, equipment brackets, and ventilation component fastening
• Plumbing Applications - Pipe support brackets, fixture mounting, and plumbing hardware assembly
• Industrial Equipment Assembly - Machine component fastening, equipment mounting, and maintenance applications
• Commercial Construction - Building hardware installation, structural component fastening, and architectural applications
• Electrical Conduit Systems - Conduit support brackets, junction box mounting, and electrical infrastructure
• Metal Fabrication Projects - Steel framework assembly, bracket installation, and structural connections
• Maintenance and Repair - Equipment servicing, component replacement, and facility maintenance tasks

Steel Zinc Construction Advantage

The steel zinc construction provides excellent corrosion resistance for indoor and moderate outdoor applications while maintaining the strength characteristics essential for reliable fastening. The zinc finish offers superior protection against rust and oxidation compared to plain steel, extending service life in electrical, plumbing, and HVAC environments where moisture and humidity are present.

Why Choose Metallics Industries Quality?

Metallics Industries has been pioneering combo drive fastener technology since 1985, being 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 engineering excellence. Trust Metallics Industries for proven fastener solutions that deliver consistent results in electrical, plumbing, HVAC, and construction applications where dual-drive versatility and professional-grade performance are essential.