Value Collection R40344442 Set Screw 4-40 1/8 in Cup Point 18-8

Product Description

The VALUE COLLECTION R40344442 is a 4-40 UNC set screw with a cup point, manufactured from Grade 18-8 stainless steel. At 1/8 inch overall length, this headless fastener is driven by a 0.050-inch hex key and seats into a mating surface to lock shafts, collars, knobs, and similar components in position. The cup point geometry bites into the workpiece for positive retention without requiring a through-hole or external fastener head. Grade 18-8 stainless steel provides corrosion resistance suitable for general industrial, mechanical, and light marine environments. Sold individually with a minimum order quantity of 100 pieces per order.

This set screw is suited for light-duty mechanical assemblies where a compact, low-profile fastener is required. Typical applications include shaft collars, pulleys, gears, encoder wheels, and panel knobs in HVAC controls, electrical enclosures, pumps, and similar trade equipment. The fine 4-40 thread pitch allows precise seating torque and is common in small-diameter precision assemblies. The 1/8 inch length is appropriate for thin hubs and shallow engagement scenarios where a longer fastener would bottom out before seating properly.

Key Features

• 4-40 UNC thread for use in standard inch-series tapped holes
• Cup point geometry provides positive bite and secure retention against rotation and axial movement
• Grade 18-8 stainless steel construction resists corrosion in wet and moderate chemical environments
• 0.050 inch hex key drive for installation in confined spaces
• 1/8 inch overall length suits thin-hub and shallow-engagement applications
• Headless design sits flush or below the surface for clearance-critical assemblies

Compatibility

Designed as a standard inch-series UNC set screw for any 4-40 tapped hole requiring a cup point headless fastener in stainless steel.

Installation Notes

Installation is performed with a 0.050 inch hex key; ensure the key is fully seated before applying torque to avoid rounding the drive socket. De-energize or lock out any rotating shaft or powered equipment before installing or removing set screws per applicable OSHA lockout/tagout procedures. Do not over-torque small-diameter set screws, as the 4-40 thread size has a low cross-section and is susceptible to torsional failure. Inspect the tapped hole for cleanliness and thread integrity before installation.