Value Collection R4-40X1/2 Pan Head Machine Screw 4-40

Product Description

The VALUE COLLECTION R4-40X1/2 is a 4-40 pan head self sealing machine screw designed for applications requiring a leak-resistant fastener. Measuring 1/2 inch in length under the head, this screw is manufactured from 18-8 stainless steel and left uncoated. A silicone O-ring seated beneath the head provides the self sealing function, compressing against the mating surface to prevent fluid or gas intrusion at the fastener point. Driven with a No. 1 Phillips driver, these screws are suited for use by electricians, HVAC technicians, and mechanical assemblers working with small-gauge threaded hardware in corrosion-prone or wet environments.

These machine screws are appropriate for light-duty fastening tasks in residential and commercial applications where moisture resistance at the fastener interface is required. Typical install scenarios include electrical enclosure assembly, control panel mounting, and small equipment chassis work where the 4-40 thread size is specified. The 18-8 stainless steel construction makes them suitable for indoor and mildly corrosive outdoor environments. They are sold in packages of 10 units.

Key Features

• Self sealing design with silicone O-ring under head for leak resistance at the fastener point
• 18-8 stainless steel construction for corrosion resistance in wet or humid environments
• Pan head profile provides a low-profile bearing surface for thin-panel applications
• No. 1 Phillips drive for standard screwdrivers and power drivers
• Uncoated finish maintains base metal properties without plating buildup
• Sold in packs of 10 to support small-quantity service and repair work

Compatibility

Designed as a standard 4-40 thread machine screw for use in any tapped or pre-threaded 4-40 hole where a self sealing fastener is specified.

Installation Notes

Installation requires a No. 1 Phillips screwdriver or matching power driver bit. Ensure the mating surface is clean and flat so the silicone O-ring seats evenly and achieves a proper seal. Do not overtighten, as excessive torque can deform or extrude the O-ring and compromise the sealing function. De-energize and lock out any equipment before accessing interior panels or enclosures where these fasteners are being installed or replaced.