Value Collection R52001338 1/4-20 X 4 in Round Head Machine Screw

Product Description

The VALUE COLLECTION R52001338 is a 1/4-20 x 4 inch round head machine screw designed for general-purpose fastening in metal fabrication, equipment assembly, and maintenance applications. The screw features a slotted Phillips drive, allowing installation with either a flat-blade or Phillips screwdriver. Manufactured from steel with a zinc plating finish, it meets ASME B18.6.3 and SAE J82 standards. The 4-inch length is measured under the head. This fastener is suited for tradespeople, millwrights, maintenance technicians, and contractors who need a reliable, standards-compliant threaded fastener for structural and non-structural assemblies.

This screw is commonly used in light industrial, commercial, and residential applications where a 1/4-20 UNC thread pattern is required. Typical uses include panel mounting, equipment enclosures, HVAC component brackets, electrical panel framing, and general mechanical assemblies. The round head profile provides a larger bearing surface than flat or pan head styles, making it appropriate for through-hole fastening where a low-profile finished appearance is acceptable. Sold individually per package with a minimum order quantity of 100 pieces.

Key Features

• 1/4-20 UNC thread for broad compatibility with standard tapped holes and nuts
• 4-inch length measured under the head for consistent installation depth
• Round head with slotted Phillips drive accepts both Phillips and flat-blade drivers
• Steel construction with zinc plating for corrosion resistance in dry indoor environments
• Meets ASME B18.6.3 and SAE J82 standards for dimensional and mechanical compliance
• No washer — installs directly against the mating surface

Compatibility

Designed as a standard 1/4-20 UNC machine screw for use in any application requiring a round head, slotted Phillips fastener in that thread size and 4-inch length.

Installation Notes

Install with a Phillips or flat-blade screwdriver sized for a 1/4-inch round head fastener. Ensure the mating hole or nut is tapped or threaded to 1/4-20 UNC specification before installation. In electrical or HVAC enclosure applications, follow applicable NEC or local codes governing fastener use in panel assemblies. Do not overtighten into soft or thin sheet metal, as the round head style does not self-counter-sink.