Baked Black Oxide with Nylon Pellet Socket Set Screw

Baked black oxide with nylon pellet cup point socket set screws are specialized fasteners built for precision, durability, and long-lasting performance in demanding applications. These screws feature a cup point tip, a nylon locking pellet, and a baked black oxide finish—a combination that delivers superior grip, corrosion resistance, and vibration-proof reliability.

The cup point design allows the screw to dig into the mating surface, providing a strong, centered hold ideal for securing gears, pulleys, collars, and rotating shafts. This design is widely used in machinery, automation equipment, automotive systems, and power tools, where components must stay fixed under torque or movement.

The baked black oxide finish enhances corrosion resistance while also improving the fastener’s aesthetic with a sleek, matte-black appearance. Additionally, the finish improves lubricity for smoother installation and reduced galling during tightening.

The key feature—the nylon pellet—is a permanently embedded element that expands against the threaded hole when installed. Unlike temporary thread lockers, the nylon pellet provides reusable, vibration-resistant locking strength without compromising the threads. This makes these set screws ideal for high-vibration environments or applications exposed to thermal cycling and movement.

Specifications include:

• Drive Type: Internal hex (socket)

• Point Type: Cup point

• Finish: Baked black oxide

• Locking Feature: Nylon pellet (pre-installed)

• Material: Heat-treated alloy steel

• Standards: ASME B18.3

• Sizes: Commonly available in #4-40 to 1/2-13 and metric sizes

Whether you're working in OEM manufacturing, repair, or custom fabrication, black oxide cup point set screws with nylon pellets offer unbeatable holding power and long-term security. Contact us today for expert guidance.