Value Collection 201017P Button Socket Cap Screw 4-40

Product Description

The VALUE COLLECTION 201017P is a 4-40 button socket cap screw designed for precision fastening in tight-clearance applications. The low-profile button head reduces snag risk in assemblies where standard hex cap screws would protrude too far. Manufactured from alloy steel with a black oxide finish, this screw provides moderate corrosion resistance and a clean appearance. The 1/16-inch hex socket drive requires an appropriate Allen key or hex bit driver. With a thread fit class of 3A and right-hand UNC threading, it meets ANSI/ASME B18.3 and ASTM F835 standards. Hardness is rated at 36 to 43 HRC, making it suitable for moderate-load mechanical assemblies.

This fastener is used in light mechanical, electronic, and instrumentation assemblies where a low-profile head is required. The 4-40 UNC thread size is common in precision equipment, panel fabrication, and small-component mounting. The black oxide finish suits indoor or protected environments. Fully threaded along the 0.25-inch under-head length, the screw engages the full depth of shallow threaded holes without a grip-length gap. This item is sold individually but requires a minimum order quantity of 100 units.

Key Features

• Button head profile reduces protrusion in flush or low-clearance assemblies
• Alloy steel construction with 36 to 43 HRC hardness for moderate-load applications
• Black oxide finish provides mild corrosion resistance and a uniform matte appearance
• Fully threaded at 0.25 inches under-head length for maximum thread engagement in shallow holes
• 1/16-inch hex socket drive for precise torque application with standard Allen tools
• Meets ANSI/ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style replacement or maintenance fastener for any assembly requiring a 4-40 UNC, 0.25-inch under-head length button socket cap screw with a 3A thread fit class.

Installation Notes

Install using a 1/16-inch hex key or Allen driver. Ensure the mating threaded hole is clean and free of debris before driving. Do not exceed the torque capacity of the 4-40 thread to avoid stripping or fastener failure. For assemblies subject to vibration, consider thread-locking compound appropriate for the service environment.