Value Collection R40342121 Set Screw 2-56 Cup Point Ss 18-8

Product Description

The VALUE COLLECTION R40342121 is a 2-56 UNC cup point set screw machined from Grade 18-8 stainless steel. At 3/16 inches in overall length, this headless fastener is driven with a 0.035-inch hex key and seats against a shaft or mating surface via its cup point geometry. The cup point bites into the shaft for positive holding without the part-removal issues associated with cone or flat point designs. Grade 18-8 stainless provides solid corrosion resistance in light-duty mechanical assemblies where mild moisture or chemical exposure is a factor. This screw is appropriate for machinists, maintenance technicians, and assembly workers installing or adjusting small mechanical components.

Cup point set screws in this size class are commonly used in small mechanical assemblies such as collars, pulleys, knobs, and gear hubs where the fastener must lock a rotating or sliding component to a shaft without protruding above the surface. The 2-56 thread size is standard in precision instrument work, light mechanical assemblies, and small equipment repair across industrial, HVAC controls, and electronic enclosure applications. This SKU ships as a single piece with a minimum order quantity of 100 units, making it suited for shop stock, production runs, or bulk maintenance inventory.

Key Features

• 2-56 UNC thread for compatibility with standard fine-pitch small-screw applications
• Cup point geometry bites into shaft surface for positive, slip-resistant seating
• Grade 18-8 stainless steel construction for corrosion resistance in light-moisture environments
• 3/16-inch overall length suits thin collars and compact mechanical assemblies
• 0.035-inch hex key drive keeps the screw fully recessed and flush with the surface
• Headless design allows installation where clearance above the shaft is minimal or zero

Compatibility

Designed as a standard 2-56 UNC cup point set screw suitable for use in any application requiring a headless hex-drive fastener in this thread size and length.

Installation Notes

Installation requires a 0.035-inch hex key or Allen driver; using an incorrectly sized key risks rounding the drive socket on this small fastener. Ensure the mating threaded hole is clean and free of debris before driving. Do not exceed the rated seating torque for a 2-56 thread in stainless steel, as these small-diameter screws are susceptible to galling and thread damage if over-torqued. Grade 18-8 stainless is not recommended for highly oxidizing or chloride-heavy environments where a higher-alloy grade would be required.