Socket Set Screw with Cup point (UNC)

Socket Set Screw with Cup Point (UNC), also known as UNC Cup Point Socket Set Screw, UNC Grub Screw, Inch Cup Point Set Screw, Imperial Cup Point Grub Screw, Allen Set Screw UNC or Hex Socket Set Screw with Cup Point UNC, is an inch / imperial threaded headless fastener with an internal hexagon socket drive and a cup-shaped point at the end. It is commonly used to lock, hold, secure or position one component against another without using a traditional screw head.

Unlike normal cap screws, socket set screws do not have an external head. They are tightened into a threaded hole using an Allen key or hex key. The cup point is one of the most common point styles because the rim of the cup point can bite into the mating surface, helping to provide strong holding power in selected shaft, collar, pulley, gear, sprocket, coupling and machinery applications.

Socket Set Screw with Cup Point (UNC) is suitable for inch / imperial threaded applications where UNC coarse thread is required. It is commonly used in imported machinery, American standard equipment, pulleys, gears, collars, sprockets, couplings, hubs, knobs, handles, fixtures, jigs, motors, pumps, gearboxes and industrial maintenance applications.

Material :

• Steel , Stainless Steel 304 (A2) , Stainless Steel 316 (A4)

Finishing :

• Steel comes in Black Oxide Finishing

Dimensions:

Key Features:

• UNC socket set screw with cup point for inch / imperial thread applications
• Also known as UNC grub screw, inch cup point set screw, Allen set screw UNC or hex socket set screw with cup point UNC
• Headless design allows the screw to sit inside or below the threaded hole surface
• Internal hexagon socket drive for Allen key / hex key installation
• Cup point helps bite into the mating surface for strong holding in selected applications
• UNC coarse thread suitable for imported machinery, American standard equipment and inch-thread replacement work
• Suitable for shafts, collars, pulleys, gears, sprockets, hubs, knobs, handles and couplings
• Useful for hidden fastening, shaft locking, component positioning and anti-slip holding
• Steel option suitable for general machinery, tooling and industrial fastening applications
• Stainless Steel 304 (A2) option suitable for better corrosion resistance and cleaner appearance
• Stainless Steel 316 (A4) option suitable for selected outdoor, coastal, marine, wet or chemical-prone environments
• Steel comes in Black Oxide Finishing
• Practical for maintenance, repair, replacement, production assembly and project supply

Applications:

Socket Set Screw with Cup Point (UNC) is commonly used in:

• Inch / imperial threaded hole applications
• Imported machinery repair and replacement
• American standard equipment maintenance
• Shaft locking and component positioning
• Pulley and gear fixing
• Sprocket and collar fastening
• Coupling and hub locking
• Knob, handle and lever fixing
• Jig and fixture positioning
• Machinery assembly and maintenance
• Automation equipment assembly
• Motor, pump and gearbox repair
• CNC machine and production equipment maintenance
• Factory maintenance and MRO work
• General commercial and industrial fastening applications

Common Related Names

UNC Cup Point Socket Set Screw

• A technical name for an inch-thread headless socket screw with cup point.

UNC Grub Screw

• A common workshop and maintenance name, especially when used to lock parts onto shafts.

Inch Cup Point Set Screw

• Used when customers need non-metric set screws for imperial thread applications.

Allen Set Screw UNC

• A practical trade name because the screw is installed using an Allen key and has UNC thread.

Hex Socket Set Screw with Cup Point UNC

• A detailed name that describes the internal hex socket drive, cup point and UNC thread.

Why Choose Our Socket Set Screw with Cup Point (UNC)

Choosing the correct Socket Set Screw with Cup Point (UNC) is important for thread fitment, holding strength, point contact, corrosion resistance, drive engagement and long-term assembly reliability. The screw should match the UNC thread size, threads per inch, length, material, finishing, hex socket size, mating threaded hole, shaft material, tightening torque and working environment.

Steel Socket Set Screw with Cup Point (UNC) with Black Oxide Finishing is a practical option for general machinery, indoor equipment, pulleys, collars, gears, sprockets, couplings, knobs, handles, jigs, fixtures, imported machinery repair and industrial maintenance applications. Stainless Steel 304 (A2) Socket Set Screw with Cup Point (UNC) is suitable when better corrosion resistance, cleaner appearance and stainless steel material compatibility are required. Stainless Steel 316 (A4) Socket Set Screw with Cup Point (UNC) is suitable for selected outdoor, coastal, marine, wet or higher-corrosion environments where stronger corrosion resistance is needed.

UNC thread is important when the existing part follows inch / imperial coarse thread instead of metric thread. It is commonly required for imported machinery, American standard equipment, older machines, replacement parts and maintenance work where the tapped hole, pulley, hub, collar or coupling is already made with UNC thread.

The cup point design is useful because the edge of the cup point can press into the mating surface and improve holding power in selected assemblies. It is commonly selected for shaft-mounted parts, rotating components, collars, hubs and mechanical positioning applications where a firm grip is required.

Compared with flat point set screws, cup point set screws can provide stronger bite, but they may leave a mark on the shaft or mating surface. Compared with cone point set screws, cup point set screws are commonly selected for general holding and shaft locking, while cone point screws are more aggressive for positive location.

UNC set screws must be matched carefully with the correct thread size and threads per inch. A UNC set screw cannot be forced into a UNF fine thread or metric threaded hole, even if the diameter looks similar. Using the wrong thread standard can damage the mating thread and cause poor fastening performance.

For best performance, the screw should be tightened using the correct Allen key size and suitable torque. For high-speed rotating, high-load, safety-related, vibration-prone or critical machinery assemblies, screw size, thread engagement, point contact, shaft hardness, torque value and joint design should be checked by a qualified person or project specification.

We supply Socket Set Screw with Cup Point (UNC) for machinery users, factories, maintenance departments, imported equipment repair teams, automation machine builders, tooling workshops, mould and die users, jig and fixture makers, equipment manufacturers, metal fabricators, motor repair teams, pump service teams, gearbox service users, workshop users, hardware resellers and industrial customers in Selangor, Kuala Lumpur and across Malaysia, including Klang, Shah Alam, Puchong, Petaling Jaya, Subang, Port Klang, Balakong, Cheras, Kajang, Rawang, Semenyih, Ampang, Banting, Putrajaya, Cyberjaya and Seremban.