Value Collection 354-5406-01 Flat Socket Cap Screw 4-40

Product Description

The VALUE COLLECTION 354-5406-01 is a 4-40 UNC flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. Machined from alloy steel with a black oxide finish, this screw delivers reliable corrosion resistance and surface hardness in a compact form factor. The 82-degree flat head seats flush with the mating surface, and the Torx Plus T10 drive provides high torque transfer with reduced cam-out compared to standard hex socket drives. At 3/8 inches overall length and fully threaded, this fastener suits tight-clearance assemblies where full thread engagement is required. Meets ASME/ANSI B18.3 and ASTM F835 standards. Sold in multiples of 100.

This screw is used in precision mechanical assemblies, electronic enclosures, fixtures, and light structural applications where a flush fastener surface is necessary. The 4-40 thread size is common in instrument-grade and light-duty assemblies across industrial, commercial, and electronics fabrication environments. The black oxide finish is appropriate for indoor or low-moisture applications. Installation is performed by machinists, fabricators, and maintenance technicians using a Torx Plus T10 driver or bit.

Key Features

• 82-degree flat head seats flush with countersunk mating surfaces
• Torx Plus T10 drive reduces cam-out and allows higher torque transfer
• Fully threaded 3/8-inch overall length for maximum thread engagement
• Alloy steel construction with black oxide finish for surface hardness and mild corrosion resistance
• Meets ASME/ANSI B18.3 and ASTM F835 fastener standards
• 4-40 UNC thread — common in instrument and light-duty mechanical assemblies

Compatibility

Designed as an OEM-style replacement or standard-stock flat socket cap screw for any assembly specifying a 4-40 UNC, 3/8-inch overall length, 82-degree flat head fastener per ASME/ANSI B18.3 or ASTM F835.

Installation Notes

Installation is performed by machinists or maintenance technicians using a Torx Plus T10 driver or power bit. The mating material must be countersunk to an 82-degree angle to achieve a proper flush seat. Ensure the tapped hole threads are clean and free of debris before driving the fastener. Do not exceed the rated torque for 4-40 alloy steel fasteners as specified by the assembly drawing or applicable engineering standard.