Cup Point Square Head Set Screws

Cup point square head set screws are wrench-driven threaded fasteners used to secure collars, hubs, gears, pulleys, sprockets, couplings, knobs, handles, and other shaft-mounted components. The square head projects above the work, giving an adjustable wrench, box wrench, open-end wrench, or socket positive external engagement — unlike socket set screws, which install flush within the assembly and drive from above with a hex key. That external head is why this traditional drive style remains specified for industrial equipment, agricultural machinery, maintenance work, and legacy designs: it takes ordinary wrenches, accepts firm installation torque, and stays accessible for repeated adjustment throughout the life of the machine.

The recessed cup point concentrates holding force in a ring of rim contact against the mating shaft or component, and depending on the mating material it may leave a witness mark or shallow indentation at the contact point. These fasteners are dimensioned to ANSI/ASME B18.6.2, which defines the full square head set screw geometry: a true square head with controlled width across flats and width across corners, specified head height, a crowned top with a defined head radius, and a relieved neck below the head. The width across flats governs wrench size; the width across corners governs the swing clearance the head needs — both worth checking when the screw sits near adjacent hardware.

Proper selection starts with thread size and screw length, then wrench access: available clearance for the head's across-corners swing, the mating material, the holding action required, and whether surface marking at the contact point is acceptable. Individual product pages list verified thread size, screw length, nominal body diameter, and square head dimensions per ANSI/ASME B18.6.2 to give engineers and purchasing professionals the numbers they need to specify with confidence.

Cold Headers supplies cup point square head set screws in a broad range of inch thread sizes and lengths, including standard, uncommon, and difficult-to-source configurations. Our catalog is organized to simplify exact-size sourcing while providing consistent engineering information across every product family.

Why Choose Cup Point Square Head Set Screws?

• Cup point geometry: Creates localized rim contact with the mating surface for dependable holding action.
• Square head drive: Positive external engagement for adjustable, box, open-end, or socket wrenches — no special driver required.
• Accessible for service: The head remains above the assembly, so the screw can be adjusted, retightened, or removed repeatedly with ordinary hand tools.
• ANSI/ASME B18.6.2 dimensions: Width across flats, width across corners, head height, head radius, and neck relief follow the published standard, size for size.
• Industrial applications: Proven on collars, hubs, pulleys, gears, couplings, and shaft-mounted components across power transmission, agricultural, pump, conveyor, and machine tool equipment.

Selecting the Correct Cup Point Square Head Set Screw

Begin by confirming the required thread size and screw length. Review the square head dimensions against available wrench clearance — flats for wrench size, corners for swing — then consider the mating material, the required holding action, and acceptable surface marking. Cup point square head set screws should not be substituted automatically for flat point, cone point, oval point, dog point, or knurled cup point designs, because each point geometry provides different contact characteristics.

Cold Headers Inc. has supplied specialty industrial fasteners since 1962. Our catalog helps engineers, distributors, maintenance teams, and purchasing professionals locate exact sizes, uncommon lengths, and difficult-to-find square head set screws without unsupported inventory claims.

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.