Hillman Fasteners 90401 Machine Screw 1/4-20 X 1.5 in Zinc 100pk

Product Description

The HILLMAN FASTENERS 90401 is a slotted round head machine screw designed for general-purpose mechanical fastening in HVAC, plumbing, electrical, and light structural applications. Each screw measures 1/4-20 thread pitch by 1.5 inches in length and features a zinc plating for corrosion resistance in typical indoor and light-duty environments. The slotted drive allows installation with a standard flathead screwdriver. This 100-pack format suits service vans and shop stock where consistent fastener supply is needed for panel assemblies, equipment covers, and fixture mounting.

These machine screws are a common choice for attaching control panels, junction box covers, access doors, and mounting brackets across residential and light commercial trade work. The 1/4-20 unified coarse thread is a widely used standard size in HVAC cabinet assembly, electrical enclosures, and plumbing equipment frames. The round head profile provides a broad bearing surface and a low-profile finished appearance suitable for visible or semi-visible fastening points.

Key Features

• 1/4-20 unified coarse thread for broad hardware compatibility
• 1.5-inch length suits medium-depth panel and bracket fastening
• Zinc plating provides corrosion resistance in dry to mildly humid environments
• Slotted round head drive works with standard flathead screwdrivers
• 100-piece pack supports bulk stocking for service and shop use

Compatibility

Designed as a standard 1/4-20 coarse-thread machine screw compatible with any tapped hole or nut conforming to the 1/4-20 UNC thread standard, common across HVAC cabinets, electrical enclosures, and general equipment assemblies.

Installation Notes

Install with a flathead screwdriver or appropriate slotted bit driver. Ensure the receiving hole is properly tapped or that a matching 1/4-20 nut is used to avoid thread stripping. De-energize any electrical equipment before fastening panels or enclosures. Apply consistent torque by hand to avoid over-driving and deforming the slotted head.