Value Collection 211018P Flat Socket Cap Screw 4-40

Product Description

The VALUE COLLECTION 211018P is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. It features an 82-degree flat head and a 1/16-inch hex socket drive, accepting a standard hex key for installation and removal. The screw is sized 4-40 with a 3/8-inch overall length and is fully threaded along its entire shank. Constructed from alloy steel with a black oxide finish, it provides solid mechanical strength and moderate corrosion resistance in indoor or protected environments. This fastener follows ASME/ANSI B18.3 and ASTM F835 standards. It is suited for precision assemblies, machine components, and enclosures where a low-profile head is required.

This screw is used in light mechanical assemblies, electronics enclosures, jigs, fixtures, and equipment panels where a countersunk socket-drive fastener is needed. The 4-40 UNC thread size is common in instrument-grade and small-machine applications. The fully threaded shank allows engagement along the complete fastener length, which is particularly useful in thin-material applications. Machinists, millwrights, and maintenance technicians typically install this type of fastener in production and repair settings.

Key Features

• 82-degree flat head profile for flush or countersunk installation
• 1/16-inch hex socket drive for standard hex key use
• 4-40 UNC thread with fully threaded shank for maximum engagement
• 3/8-inch overall length
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM F835 standards
• Black oxide finish for surface protection in low-moisture environments

Compatibility

Designed as an OEM-style replacement or standard-service fastener for any assembly requiring a 4-40 UNC fully threaded flat socket cap screw with an 82-degree head angle and 1/16-inch hex drive.

Installation Notes

Install using a 1/16-inch hex key or appropriate bit driver. Ensure the mating counterbore or countersink is machined to match the 82-degree head angle before installation. De-energize and lock out any equipment before replacing fasteners in live assemblies. Avoid over-torquing small-diameter screws, as alloy steel fasteners at this thread size have limited torque capacity.