Value Collection 0408ESP 4-40 X 1/2 in Pan Head Slotted Machine Screw

Product Description

The VALUE COLLECTION 0408ESP is a 4-40 x 1/2 inch pan head slotted machine screw manufactured from steel with a zinc finish. It is sized for light-duty mechanical assemblies where a low-profile, flat-bottomed head is required and a standard slotted driver is on hand. The thread specification follows ASME B18.13a and SAE J82, making it a recognized standard fastener for general industrial, electrical enclosure, and light sheet-metal applications. The zinc coating provides basic corrosion resistance in dry or mildly humid environments. This fastener is sold in minimum order quantities of 100 pieces per transaction, making it appropriate for shop stock, production runs, or service van restocking.

This screw is suited for use in residential and light commercial applications where 4-40 threaded holes are specified. Common install scenarios include control board mounting, electrical panel sub-assemblies, HVAC component brackets, and low-voltage enclosures. The pan head profile distributes clamping load across a wider bearing surface compared to a flat or oval head, which is useful when fastening into thin sheet metal or plastic housings. Installers in HVAC, electrical, and light mechanical trades will find this a standard-stock item for field repairs and panel assembly work.

Key Features

• 4-40 thread size conforming to ASME B18.13a and SAE J82 standards
• 1/2 inch length measured under the head for accurate stack-up calculations
• Pan head profile provides a wide, flat bearing surface suited for thin materials
• Slotted drive compatible with standard flat-blade screwdrivers and power bits
• Zinc finish over steel construction for basic corrosion resistance
• Sold in multiples of 100 for shop-stock and production restocking

Compatibility

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

Installation Notes

Installation is performed with a flat-blade screwdriver or matching slotted power bit sized for a 4-40 pan head fastener. Ensure the mating threaded hole or nut is clean and properly sized before driving to avoid thread stripping in the base material. De-energize any electrical assembly completely before installing or removing fasteners inside control enclosures or panel boards, following applicable NEC guidelines. Do not over-torque; small-diameter machine screws in this size range are susceptible to thread damage if driven beyond hand-snug resistance in soft or thin materials.