Value Collection R63061640 Button Socket Cap Screw 2-56

Product Description

The VALUE COLLECTION R63061640 is a button socket cap screw designed for precise, low-profile fastening in mechanical assemblies. Manufactured from 18-8 stainless steel with a bright, uncoated finish, it resists corrosion in wet or mildly chemical environments. The screw is threaded 2-56 UNC with a right-hand thread fit class 3A, measuring 3/16 inch under the head. Drive engagement is through a hex socket, which allows high torque transfer in tight spaces. Machinists, assembly technicians, and field service professionals use this fastener where a standard hex cap screw head would protrude too far for the application.

This screw is suited for light-duty mechanical assemblies, instrument enclosures, electronics chassis, and precision equipment where a flush or near-flush profile is required. The 2-56 thread size is common in small-scale fabrication work, control panel assembly, and equipment used across HVAC, electrical, and plumbing trades. The 18-8 stainless steel construction makes it appropriate for indoor and light outdoor service where stainless-grade corrosion resistance is specified.

Key Features

• Button head profile keeps fastener height low at 0.046 inches, reducing interference in tight assemblies
• Hex socket drive allows torque application in confined spaces without slipping
• 18-8 stainless steel provides corrosion resistance without plating
• Bright, uncoated finish — no coating thickness to account for in close-tolerance fits
• Conforms to ANSI/ASME B18.3 fastener standard
• Right-hand thread, class 3A fit for consistent engagement in standard tapped holes

Compatibility

Designed as a standard 2-56 UNC button socket cap screw per ANSI/ASME B18.3, compatible with any tapped hole or threaded insert conforming to the 2-56 UNC class 3A thread specification.

Installation Notes

Install with the appropriately sized hex key or hex socket bit — using an undersized key will round the drive recess and may prevent removal. Ensure the mating tapped hole or insert is clean and free of debris before fastening. Do not exceed the rated torque for 18-8 stainless in the 2-56 thread class, as galling is possible when stainless contacts stainless without lubricant. Apply a small amount of anti-seize compound when threading into stainless tapped holes to reduce the risk of galling and seizing.