Value Collection -40878-5 Button Socket Cap Screw 25 Pack

Product Description

The VALUE COLLECTION -40878-5 is a 1/4-20 button socket cap screw designed for applications requiring a low-profile head with a secure hex socket drive. Manufactured from alloy steel with a black oxide finish, this fastener meets ANSI/ASME B18.3 and ASTM F835 standards. The screw measures 1-3/4 inches under the head with a 5/32 hex drive and a 3A thread fit class, making it appropriate for precision mechanical assemblies. Hardness is rated at 36-43 HRC. This package contains 25 pieces, suitable for job-site use or shop inventory.

Button socket cap screws of this specification are commonly used in machinery, fixtures, enclosures, and fabricated assemblies where a low, rounded head profile reduces snagging and improves clearance. The black oxide coating provides mild corrosion resistance and reduces light reflection, which is beneficial in tool and die, automation, and general industrial settings. Licensed tradespeople including millwrights, mechanical contractors, and maintenance technicians typically install this type of fastener.

Key Features

• Low-profile button head with 5/32 hex socket drive for torque application in tight spaces
• Alloy steel construction rated at 36-43 HRC hardness for strength under load
• Black oxide finish for mild corrosion resistance and reduced surface reflectivity
• Partially threaded shaft with right-hand UNC thread in 3A fit class for consistent engagement
• Conforms to ANSI/ASME B18.3 and ASTM F835 fastener standards
• Sold in a 25-piece package with a minimum order quantity of 1

Compatibility

Designed as a standard UNC 1/4-20 button socket cap screw suitable for use in any application requiring an ANSI/ASME B18.3-compliant low-profile hex socket fastener in alloy steel.

Installation Notes

Install using a 5/32 hex key or socket driver; ensure the mating thread is clean and free of debris before driving. De-energize or lock out any machinery before fastener installation or replacement in accordance with applicable OSHA lockout/tagout procedures. Do not substitute a standard hex key for an impact driver on alloy socket screws, as this can damage the drive recess. Verify torque requirements based on the assembly specification for the parent application.