Value Collection 363-5406-01 Button Socket Cap Screw 4-40

Product Description

The VALUE COLLECTION 363-5406-01 is a fully threaded button socket cap screw designed for applications requiring a low-profile head with high clamping strength. Sized 4-40 with a 3/8 inch length under head, it features a 1/16 inch hex socket drive and a button-style head with a head height of 0.059 inches. Manufactured from alloy steel with a black oxide finish, this fastener meets ANSI/ASME B18.3 and ASTM F835 standards. Hardness is rated 39-44 HRC, making it suitable for moderate-to-high strength fastening requirements in metal assemblies and enclosures.

This screw is used in light mechanical assemblies, electronic enclosures, panels, and equipment housings where a flush or low-profile fastener head is required. The black oxide coating provides mild corrosion resistance and reduces light reflection, making it a common choice in instrumentation, HVAC control panels, and similar trade applications. The right-hand thread with a Class 3A fit ensures close tolerance engagement in tapped holes.

Key Features

• 4-40 thread size, fully threaded, 3/8 inch length under head
• Button head profile with 0.059 inch head height for low-clearance installations
• 1/16 inch hex socket drive for Allen wrench or hex key installation
• Alloy steel construction with 39-44 HRC hardness rating
• Black oxide finish for mild corrosion resistance and reduced reflectivity
• Meets ANSI/ASME B18.3 and ASTM F835 standards, Class 3A thread fit

Compatibility

Designed as an OEM-style replacement or standard fastener for use in any application requiring a 4-40 fully threaded button socket cap screw with a 1/16 inch hex drive.

Installation Notes

Installation is performed with a 1/16 inch hex key or Allen wrench. Ensure the mating tapped hole conforms to UNRC thread standards for proper Class 3A fit engagement. Power down and de-energize any electrical enclosure or control panel before fastener service. Do not exceed the rated hardness application range by substituting this fastener in structural load-bearing joints not designed for this size class.