Value Collection R40321448 Set Screw 5/16-18 X 3/8 in Cup

Product Description

The VALUE COLLECTION R40321448 is a 5/16-18 UNC cup point set screw manufactured from grade 18-8 stainless steel. At 3/8 inches in overall length, this fully threaded fastener is driven with a 3/32-inch hex key and seats into a mating threaded bore to lock shafts, collars, pulleys, or similar components in fixed position. The cup point geometry bites into the mating surface to resist rotation and axial movement. Grade 18-8 stainless provides corrosion resistance suitable for wet, outdoor, and mildly corrosive environments where carbon steel fasteners would degrade prematurely.

Cup point set screws in this thread size are widely used across HVAC, plumbing, and light mechanical applications — including blower wheel hubs, shaft collars on pump couplings, and equipment frames. The 5/16-18 UNC thread is a standard coarse-pitch size found on a broad range of OEM assemblies. Sold individually per package, with a minimum order quantity of 100 pieces, this SKU suits both bench-stock replenishment and job-lot purchasing for service contractors and maintenance shops.

Key Features

• 5/16-18 UNC coarse thread for broad compatibility with standard tapped holes
• 3/8-inch overall length suits shallow-bore locking applications
• Cup point geometry provides positive grip on shaft surfaces to resist rotation
• Grade 18-8 stainless steel offers corrosion resistance in wet or outdoor service
• 3/32-inch hex drive — installs with a standard Allen key or hex bit
• Minimum order quantity of 100 pieces supports bulk stock replenishment

Compatibility

Designed as a standard 5/16-18 UNC cup point set screw suitable for any tapped bore matching that thread size and depth; verify thread engagement and bore depth before installation.

Installation Notes

Installation requires a 3/32-inch hex key or matching hex bit driver. Ensure the mating bore is clean and the threads are free of debris before driving the screw. Apply thread-locking compound if vibration is expected, following the compound manufacturer guidelines. Torque to the value specified by the equipment OEM — do not overtighten, as stainless fasteners are susceptible to galling.