Value Collection R63004448 Shoulder Screw 18-8 Ss Hex Socket

Product Description

The VALUE COLLECTION R63004448 is a shoulder screw machined from 18-8 stainless steel, designed for precision fastening applications that require a smooth, close-tolerance bearing surface. The shoulder measures 3/8 inches in diameter and 3/8 inches in length, providing a defined pivot or spacer point between mated components. The threaded portion is sized 5/16-18 UNC. Drive engagement is through a 3/16-inch hex socket, requiring an Allen key or hex bit for installation. This type of fastener is commonly installed by machinists, maintenance technicians, and mechanical assemblers working on fixtures, jigs, linkages, or precision mechanical assemblies.

Shoulder screws like the R63004448 are used in applications where a rotating, sliding, or pivoting interface is needed between two parts. The unthreaded shoulder acts as a bearing journal or a precise spacer, allowing controlled movement while the threaded end clamps into a tapped hole. Typical installation scenarios include fixture plates, cam follower mounts, stripper bolt applications in stamping dies, and general mechanical assemblies requiring a ground or close-tolerance shaft surface within the fastener body.

Key Features

• 3/8-inch shoulder diameter provides a precise bearing or pivot surface
• 3/8-inch shoulder length suits shallow clearance and spacer applications
• 5/16-18 UNC thread for reliable clamping in standard tapped holes
• 18-8 stainless steel construction resists corrosion in wet or mildly chemical environments
• 3/16-inch hex socket drive for clean, recessed installation with standard Allen tooling

Compatibility

Designed as a standard shoulder screw for use in any application requiring a 3/8-inch diameter shoulder journal and a 5/16-18 UNC threaded end, including fixture plates, jigs, and mechanical assemblies with corresponding tapped holes.

Installation Notes

Installation requires a 3/16-inch hex key or hex bit driver. Ensure the receiving tapped hole is clean and sized correctly for 5/16-18 UNC thread engagement before driving the screw. Do not overtighten, as the shoulder must remain free to function as a bearing or pivot surface in most applications. Follow applicable equipment maintenance and lockout/tagout procedures before servicing any assembly containing this fastener.