Value Collection R52000826 4-40 X 3/8 in Pan Head Screw

Product Description

The VALUE COLLECTION R52000826 is a 4-40 pan head Phillips machine screw designed for precision fastening in light-duty mechanical and electrical assemblies. Manufactured from steel with a zinc-plated finish, this screw meets ASME B18.13a and SAE J82 standards, which define dimensional and material requirements for slotted and recessed pan head screws. The 4-40 thread designation indicates a No. 4 diameter with 40 threads per inch, making it a fine-thread fastener suited for thin stock and close-tolerance applications. Length under head measures 3/8 inches. An external tooth washer style is integrated into the design, providing added locking action against loosening under vibration.

This screw is commonly used in electronic enclosures, control panels, HVAC equipment cabinets, electrical junction boxes, and light-gauge sheet metal assemblies. Electricians, HVAC technicians, and electronics assembly professionals reach for 4-40 screws when working with terminal boards, control boards, and small bracket hardware where a compact, corrosion-resistant steel fastener is required. The zinc plating provides moderate corrosion resistance suitable for indoor and protected environments.

Key Features

• 4-40 thread size with 40 threads per inch for fine-thread engagement in thin material
• Pan head profile with Phillips drive for positive bit engagement and flush-to-low installation
• Zinc-plated steel construction offers moderate corrosion resistance for indoor applications
• External tooth washer style adds vibration-resistant locking without a separate lock washer
• Meets ASME B18.13a and SAE J82 dimensional and material standards
• Length under head of 3/8 inches suits standard light-gauge panel and bracket fastening

Compatibility

Designed as a standard inch-series machine screw for use in any application requiring a 4-40 thread, pan head, Phillips drive fastener per ASME B18.13a and SAE J82 specifications.

Installation Notes

Installation requires a Phillips head screwdriver or bit sized for a No. 4 screw; using an oversized driver bit can damage the recess. Always thread into a pre-tapped hole or a matching 4-40 nut; do not force-thread into untapped stock. De-energize any control board or electrical assembly before driving or removing fasteners near live components. Follow applicable NEC guidelines when fastening hardware inside electrical enclosures.