Stewart Fastener J2548MRCZ 1/4-20x3 Round Head Machine Screw Zinc

Product Description

The STEWART FASTENER J2548MRCZ is a round head combination-drive machine screw in a 1/4-20 thread size with a 3-inch length, finished in zinc plating for corrosion resistance. This fastener features a combination drive, accepting both slotted and Phillips drivers for flexibility on the job. Sold individually, each unit is drawn from a jar of 100. Trade professionals across HVAC, plumbing, electrical, and general mechanical work rely on zinc-plated machine screws like this one for secure, code-appropriate mechanical connections in panel assemblies, equipment mounting, and structural bracketing.

This screw suits a wide range of light commercial and residential trade applications where a 1/4-20 coarse thread and 3-inch grip length are specified. Common uses include equipment panel fastening, junction box assembly, ductwork bracketing, and general mechanical assembly where a round head profile and combination drive are preferred for accessibility and tool compatibility.

Key Features

• 1/4-20 coarse thread for broad compatibility with standard tapped holes and nuts
• 3-inch length provides adequate grip for thicker substrates and stacked materials
• Round head profile distributes clamping load across the surface
• Combination drive accepts slotted or Phillips drivers, reducing tool changeover
• Zinc plating provides basic corrosion resistance for indoor and light-duty applications
• Sold per each from a jar of 100, allowing single-unit purchase or bulk stocking

Compatibility

Designed as a standard 1/4-20 coarse thread round head machine screw suitable for use with any tapped hole, hex nut, or coupling nut conforming to the 1/4-20 UNC thread standard.

Installation Notes

Installation is appropriate for qualified trade technicians following applicable mechanical and electrical codes. De-energize and lock out equipment before fastening panels or covers on electrical or HVAC assemblies. Use the correct driver bit to avoid cam-out and head damage. Do not overtorque into tapped aluminum or plastic housings without referencing the equipment manufacturer's fastener specification.