Value Collection NT-440-250-SS Set Screw 4-40 X 0.25 in Ss

Product Description

The VALUE COLLECTION NT-440-250-SS is a hex-drive set screw designed for secure, no-mar fastening in light assemblies and precision components. It features a 4-40 UNC thread and measures 0.25 inches in overall length. Constructed from grade 18-8 stainless steel, this fastener offers solid corrosion resistance in moderate-exposure environments. The soft nylon tip distributes clamping force without scoring or damaging the mating surface, making it well-suited for locking shafts, knobs, and collars where surface finish must be preserved. Installed with a hex key, this screw fits standard production and maintenance workflows across mechanical and electrical assembly applications.

This set screw is used in applications where a threaded fastener must hold a component in position without penetrating or marring the contact surface. Common install scenarios include motor shaft collars, control knobs, optical mounts, and small mechanical assemblies requiring periodic adjustment. The nylon tip compresses slightly under load to grip without galling, which is especially useful on aluminum, brass, and soft-metal shafts. Minimum order quantity is 10 pieces, sold as individual units.

Key Features

• Hex drive for standard hex-key installation in confined spaces
• Soft nylon tip protects mating surfaces from scoring or marring
• Grade 18-8 stainless steel construction for corrosion resistance
• 4-40 UNC thread standard for compatibility with fine-pitch tapped holes
• Full-thread length of 0.25 inches maximizes engagement in shallow bosses

Compatibility

Designed as a standard 4-40 UNC hex-drive soft-tip set screw for use in any tapped 4-40 threaded hole requiring non-marring point contact.

Installation Notes

Install using the appropriate hex key sized for the drive recess. Ensure the tapped hole is clean and free of debris before threading in the screw to avoid cross-threading the fine 4-40 thread. Do not overtighten, as the nylon tip can deform under excessive torque, reducing holding performance. Follow applicable mechanical assembly standards for fastener seating in precision or load-bearing applications.