Value Collection R4-40X5/16 Pan Head Machine Screw

Product Description

The VALUE COLLECTION R4-40X5/16 is a pan head, Phillips-drive self sealing machine screw designed for applications where thread-level sealing is required without a separate gasket or sealant. Built from 18-8 stainless steel with a silicone O-ring, this screw provides corrosion resistance and a reliable seal against moisture and light fluid intrusion. The 4-40 thread size and 5/16 inch length under head make it suited for precision assemblies in HVAC controls, electrical enclosures, and similar light-duty trade applications. The uncoated finish keeps tolerances tight for threaded metal inserts. Sold in packs of 10.

This screw is used in residential and light commercial applications where fasteners must prevent ingress of moisture, dust, or air through the fastener hole. Typical install scenarios include control box assemblies, panel enclosures, terminal covers, and equipment access panels. The silicone O-ring compresses under the pan head during installation to form a positive seal at the bearing surface. Technicians in HVAC, electrical, and related trades use this style of fastener when standard machine screws are insufficient for sealing requirements.

Key Features

• Self sealing design with integrated silicone O-ring compresses under the pan head for a moisture-resistant seal
• 18-8 stainless steel construction provides corrosion resistance in humid or wet environments
• 4-40 thread size with 5/16 inch length under head suits compact control and enclosure assemblies
• Phillips No. 1 drive for compatibility with standard screwdrivers and bit sets
• Uncoated finish maintains dimensional accuracy for tight-tolerance threaded applications
• Sold in quantities of 10 per pack for small-lot service and repair use

Compatibility

Designed as an OEM-style replacement or service fastener for equipment assemblies requiring a 4-40 self sealing machine screw with a pan head profile and silicone O-ring seal.

Installation Notes

Installation is performed by hand or with a No. 1 Phillips screwdriver or bit. Power down and de-energize any electrical enclosure or control assembly before fastener service. Do not overtighten, as excessive torque will distort or extrude the silicone O-ring and compromise the seal. Inspect the O-ring for damage before reuse if the screw has been previously installed.