Hillman Fasteners 90413 Machine Screw 1/4-20 X 2.5 in Zinc 100pk

Product Description

The HILLMAN FASTENERS 90413 is a zinc-plated, slotted round head machine screw sized 1/4-20 x 2.5 inches, sold in a 100-count pack. The 1/4-20 thread designation indicates a 0.25-inch nominal diameter with 20 threads per inch (UNC coarse thread). The round head profile provides a low-profile bearing surface, and the slotted drive accommodates a standard flat-blade screwdriver. Zinc plating delivers basic corrosion resistance for general indoor and light-duty outdoor applications. These screws are a standard fastener stocked by HVAC, plumbing, electrical, and mechanical contractors for panel assembly, equipment mounting, and general shop use.

The 90413 is suited for general mechanical assembly tasks in trade and light industrial environments. Common applications include securing electrical enclosure panels, mounting brackets, HVAC equipment covers, and plumbing access panels. The coarse UNC thread pattern makes these screws compatible with standard tapped holes, threaded inserts, and hex nuts in steel, aluminum, and similar materials. Supplied in a 100-count pack, this quantity is practical for job-site use or shop stock.

Key Features

• 1/4-20 UNC coarse thread, 2.5-inch length for versatile fastening depth
• Slotted round head drive accepts standard flat-blade screwdrivers
• Zinc plating provides corrosion resistance for general-duty use
• 100-count pack suited for job-site stock or shop inventory
• Standard thread pattern compatible with 1/4-20 tapped holes, nuts, and inserts

Compatibility

Designed as a standard 1/4-20 UNC machine screw for use with any application requiring a 0.25-inch coarse-thread fastener, including tapped holes, threaded inserts, and 1/4-20 hex nuts in steel or aluminum assemblies.

Installation Notes

Install with a flat-blade screwdriver sized to the slot width to prevent cam-out and head damage. Apply appropriate thread torque for 1/4-20 fasteners per the assembly specification or applicable mechanical code. De-energize and isolate any electrical enclosure or equipment before removing or installing panel fasteners. Avoid over-torquing, which can strip the slot or damage tapped threads in softer base materials.