Value Collection 363-5403-01 Button Socket Cap Screw

Product Description

The VALUE COLLECTION 363-5403-01 is a fully threaded button socket cap screw designed for compact fastening applications where a low-profile head is required. It features a 4-40 UNC thread with a 3/16-inch length under the head and a 1/16-inch hex socket drive. The alloy steel construction is finished with black oxide coating for mild corrosion resistance and reduced light reflection. Hardness is rated at 39-44 HRC per ASTM F835, making it suitable for moderate-load mechanical assemblies. This screw is installed by machinists, assemblers, and field technicians across industrial, instrumentation, and precision mechanical applications.

This fastener is well suited for light-duty structural and non-structural assemblies where thread size 4-40 is specified, including instrument panels, electronic enclosures, jigs, fixtures, and small mechanical components. The button head profile keeps the fastener below surrounding surfaces, reducing snag points in tight clearance areas. It is appropriate for residential and commercial equipment assembly wherever a low-profile alloy steel cap screw is called out on a drawing or BOM.

Key Features

• Button head profile provides a low-profile, snag-resistant fastening surface
• 4-40 UNC right-hand thread with Class 3A fit for precise thread engagement
• 1/16-inch hex socket drive for use with standard hex keys and ball drivers
• Alloy steel construction rated 39-44 HRC for moderate mechanical load capacity
• Black oxide finish reduces surface reflectivity and provides mild corrosion resistance
• Meets ANSI/ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a standard 4-40 UNC button socket cap screw per ANSI/ASME B18.3 and ASTM F835, suitable for any application specifying a 4-40 x 3/16-inch fully threaded button head socket cap screw in alloy steel with black oxide finish.

Installation Notes

Install and remove using a 1/16-inch hex key or ball-end driver. Ensure the mating thread is clean and free of debris before installation to maintain Class 3A thread fit integrity. Do not exceed the torque capacity appropriate for 4-40 alloy steel fasteners as specified in the applicable design standard. This screw is sold in minimum order quantities of 100 pieces.