Set Screws Cup Point

What are Set Screws Cup Point?

Cup point set screws are headless fasteners with a hollow, radiused tip that bites into the mating surface. The cup profile concentrates clamp force for secure holding with moderate surface marking, making them the go-to choice for collars, pulleys, and general machinery on round shafts.

Why choose Set Screws Cup Point

• Strong bite — cup edge digs in to resist slip and vibration.
• Low-profile — headless, flush fit for tight spaces and clean assemblies.
• Serviceable — hex-socket drives allow precise torque in confined locations.
• Versatile — works on shafts with or without a machined flat.

Common applications for Set Screws Cup Point

• Securing collars, gears, sprockets, and pulleys on round shafts
• Positioning knobs and handles on flats
• Fixtures, jigs, instruments, and general machinery

Materials and finishes for Set Screws Cup Point

• Alloy steel black oxide for high strength in dry interiors.
• 18-8 / 304 stainless for broad corrosion resistance.
• 316 stainless for coastal/marine or chloride exposure.

How to size and specify Set Screws Cup Point

Order by diameter × thread × overall length (e.g., 10-32 × 3/16″, 1/4″-20 × 3/8″, M6-1.0 × 8 mm). Match thread standard (UNC/UNF or metric ISO) to your tapped hole.

How Cup Point Set Screws compare to other point styles

• Cup vs knurled cup — knurled adds serrations for extra bite under vibration.
• Cup vs flat — flat minimizes marring on a machined flat and suits frequent adjustment.
• Cup vs cone — cone penetrates deeper for the strongest location.
• Cup vs dog / half-dog — dog points index into a hole/slot for positive positioning.

Installation tips for Set Screws Cup Point

• Use the correct hex key fully seated; tighten to recommended torque.
• If possible, add a small flat on the shaft to increase anti-slip resistance.
• Apply threadlocker or a jam set screw where vibration is present.