1/4"-28 UNF Knurled Cup Point Socket Set Screws

Alloy Steel | Thermal Black Oxide | Bulk Pack

Secure your assemblies and minimize vibration-related loosening with 1/4"-28 UNF Knurled Cup Point Socket Set Screws. Manufactured from high-strength alloy steel and finished in thermal black oxide, these set screws provide both durability and moderate corrosion resistance across a variety of mechanical and industrial applications. Their knurled cup point design features serrated ridges that dig into the mating surface, preventing the screw from backing out under vibration or torque stress. Supplied in convenient bulk packs for cost savings on large projects.

Key Features

• Size & Thread: 1/4"-28 UNF (Fine Thread)
• Point Type: Knurled Cup Point for enhanced grip and vibration resistance
• Material: High-strength alloy steel for reliability
• Finish: Thermal Black Oxide for mild corrosion resistance and a smooth, dark appearance
• Drive Style: Internal Hex Socket (Allen wrench/hex key required)
• Purpose: Ideal for holding collars, pulleys, gears, or other components on shafts
• Bulk Availability: Cost-effective packs designed for large-scale applications

Why Knurled Cup Point?

The knurled cup point offers superior vibration resistance by cutting into the contact surface, ensuring the set screw remains securely in place. This design helps prevent loosening even under high torque or repetitive movements, making these screws particularly suitable for shafts in rotating assemblies.

Ideal Applications

• Securing Collars, Gears, & Pulleys on Shafts
• Rotary Equipment & Machinery
• Automotive and Small Engine Repair
• General Mechanical & Industrial Use
• Precision Instrumentation

Installation Tips

• Use the appropriately sized hex socket/Allen wrench for proper torque application.
• Apply steady, even torque to achieve secure fastening without over-tightening.
• Ensure the mating surface is clean and free of debris to maximize grip.
• Avoid excessive torque to prevent damage to the set screw or the tapped hole.

Order in Bulk Today

Discover reliable, vibration-resistant fastening with 1/4"-28 UNF Knurled Cup Point Socket Set Screws. Order now to take advantage of fast shipping, bulk discounts, and dependable quality for all your mechanical applications.

✔️ Knurled cup point ensures a secure grip under vibration

✔️ Thermal black oxide finish for moderate corrosion resistance

✔️ Ideal for collars, gears, pulleys, and rotating assemblies