Value Collection 583671PR 1/4-20 X 2-1/2 in Round Head Slotted Screw

Product Description

The VALUE COLLECTION 583671PR is a 1/4-20 x 2-1/2 inch round head slotted machine screw built from alloy steel with a zinc finish. It follows inch-system threading standards with a unified national coarse (UNC) thread form and is measured length-under-head. The zinc coating provides baseline corrosion resistance for general indoor and light-duty mechanical fastening applications. At 0.05 pounds per unit, this screw is sized for reliable clamping in metal-to-metal or metal-to-substrate assemblies where a rounded, domed head profile is required. Installation requires a standard flat-blade screwdriver or slotted bit. This fastener is supplied individually but carries a minimum order quantity of 100 units.

This screw is suited for light structural, mechanical, and enclosure fastening tasks across trades including HVAC, electrical, and general maintenance. The round head profile sits above the mating surface, making it a common choice when countersinking is not practical or required. The 1/4-20 UNC thread is one of the most widely used coarse-thread sizes in trade applications, compatible with standard 1/4-20 hex nuts, wing nuts, and tapped holes. It is used in equipment panels, junction boxes, brackets, and similar assemblies where a removable fastener is needed.

Key Features

• 1/4-20 UNC coarse thread for broad compatibility with standard hardware
• 2-1/2 inch length measured under head for accurate fastener selection
• Round head profile seats above mating surface without countersinking
• Slotted drive accepts standard flat-blade screwdrivers and bits
• Alloy steel construction with zinc finish for corrosion resistance
• No washer included; washer style is without washer

Compatibility

Designed for use in any application requiring a 1/4-20 UNC round head slotted machine screw with a 2-1/2 inch length-under-head measurement. Fits standard 1/4-20 tapped holes and pairs with 1/4-20 nuts per inch-system fastener standards.

Installation Notes

Installation is performed with a flat-blade screwdriver or slotted power-driver bit sized for a 1/4-inch machine screw. De-energize or lock out any equipment before fastening hardware inside electrical enclosures or mechanical panels, following NFPA 70 (NEC) or applicable safety codes. Do not overtighten alloy steel screws in soft or tapped aluminum substrates, as thread stripping can occur. Verify thread engagement depth in blind tapped holes before applying full torque.