Value Collection 701028PR Button Socket Cap Screw 4-40

Product Description

The VALUE COLLECTION 701028PR is a button socket cap screw designed for applications where a low-profile head is required over a standard socket head. The screw is fully threaded with a 4-40 UNC thread and measures 5/8 inch under the head. It is driven by a 1/16 inch hex socket key. Manufactured from alloy steel with a black oxide finish, it offers moderate corrosion resistance in dry or lightly oiled environments. Hardness ranges from 36 to 43 HRC, providing high tensile strength suitable for precision mechanical assemblies. Machinists, tool and die technicians, and mechanical assemblers install these fasteners in light-duty fixtures, jigs, and enclosures.

This fastener is suited for applications requiring a smooth, rounded head profile that sits flush or slightly above the mating surface. Typical installations include instrument panels, electronics enclosures, small mechanical assemblies, and OEM equipment where clearance above the fastener is limited. The black oxide finish blends with dark surfaces and provides light surface protection. Compliance with ANSI/ASME B18.3 and ASTM F835 makes it appropriate for controlled manufacturing environments where dimensional standards are specified. Sold individually, with a minimum order quantity of 100 pieces.

Key Features

• Button head profile for low-clearance installations where a standard socket cap head would interfere
• Fully threaded 4-40 UNC right-hand thread with Class 3A fit for precise thread engagement
• Alloy steel construction with 36 to 43 HRC hardness for high tensile load capacity
• Black oxide coating provides light corrosion resistance and a low-glare dark appearance
• Compliant with ANSI/ASME B18.3 and ASTM F835 dimensional and performance standards
• 1/16 inch hex socket drive compatible with standard hex keys and socket bits

Compatibility

Designed as a standard 4-40 UNC button socket cap screw conforming to ANSI/ASME B18.3, suitable for use in any tapped 4-40 hole requiring a button head fastener.

Installation Notes

Installation requires a 1/16 inch hex key or hex bit driver. Ensure the mating tapped hole is clean and free of debris before threading. Do not overtighten small-diameter fasteners, as the 4-40 thread size is susceptible to shear if torque is applied beyond the fastener's rated capacity. Use in conjunction with applicable engineering standards for fastener seating in precision assemblies.