1-3/8"-6 Heavy Slotted Hex Nut with Plain Finish

Slotted Heavy Castle Hex Nut with Plain Finish – Rugged Locking Power for High-Load Applications

For demanding mechanical assemblies that require a secure and rugged lock, the Slotted Heavy Castle Hex Nut with Plain Finish is the trusted choice across industries. With its reinforced heavy pattern and slotted crown, this nut is purpose-built for use in high-load, high-vibration environments where traditional nuts might loosen over time.

The “castle” design features evenly spaced slots in the top of the nut. These allow for insertion of a cotter pin through a pre-drilled bolt or stud, creating a mechanical lock that ensures the nut stays in place—even under extreme stress. The heavy hex body offers a larger bearing surface and greater wrenching strength compared to standard hex nuts, making it ideal for heavy machinery, automotive steering assemblies, agricultural equipment, and construction applications.

Made from strong low carbon or alloy steel, the Slotted Heavy Castle Nut in plain finish is perfect for indoor applications or environments where a protective coating isn’t required. The uncoated surface offers excellent metal-to-metal contact, which can be useful in grounding or conductivity applications.

Specifications:

• Material: Low carbon or alloy steel

• Finish: Plain (uncoated for dry, indoor, or grounding uses)

• Design: Slotted crown for cotter pin locking

• Body Style: Heavy hex for increased torque tolerance

• Thread Types: UNC, UNF, and metric available

• Standards: Complies with ASME B18.2.2 and SAE J995

• Sizes: Inch and metric sizes available

Applications:

• Automotive suspensions and axle assemblies

• Industrial and agricultural machinery

• Construction equipment joints

• Railway and structural applications

The Slotted Heavy Castle Hex Nut with Plain Finish delivers time-tested locking performance for the most rugged applications—when failure is not an option.