Find the perfect slotted round nut for your industrial assembly needs within our extensive online inventory. These specialized circular fasteners, also known as slotted ring nuts or DIN 1804 slotted nuts, are engineered for high-precision applications where space is limited and vibration resistance is critical. Our selection includes various thread pitches and corrosion-resistant materials like stainless steel and zinc-plated carbon steel. Whether you are performing routine maintenance or sourcing components for OEM manufacturing, you can browse our full catalog of slotted round nuts to find the exact dimensions required for your project.

Slotted Round Nut

Slotted round nuts give you precise, adjustable locking exactly where axial accuracy matters most. Engineered for repeatable set-and-hold performance, our slotted round nuts make bearing preload, spindle retention, and critical assemblies fast, confident, and service-friendly. Choose them when you want the smoothness of fine adjustment with the security of a mechanical lock.

DIN 1804

Controlled Torque and Repeatable Adjustment

Our slotted round nuts follow DIN 1804 geometry, with cleanly machined outer slots that accept a hook or pin spanner for positive engagement. That means controlled torque, small incremental turns, and reliable seating without fighting cramped clearances or marking hardware. 

Because the driving force sits on the outer circumference, each movement is finely controlled and easy to repeat. Our profile gives you the leverage to make micro-adjustments, settle components, and recheck endplay without disturbing the rest of the stackup. When tolerances are tight and uptime matters, this simple, tactile control is the difference between “close enough” and “perfect.”

If your build calls for castellated profiles or high-heat connections, consider pairing this range with our Castle Nut, Low Castle Nut, or Exhaust Nuts to complete the system.

DIN 1804 Slotted Round Nuts

DIN 1804 slotted round nuts are circular locknuts designed for accurate axial positioning on threaded shafts. The outer slots accept a hook or pin spanner, allowing you to dial in preload in small, predictable increments, then lock the position without guesswork. In practice, that translates into smoother bearing performance, reduced backlash, and a repeatable setup you can service over and over.

Built for Bearing Retention and Beyond

Use our slotted round nuts anywhere you need dependable axial hold: setting bearing preload on spindles, locking ball screws, retaining couplings, or stabilizing gear trains. The round form factor clears nearby features gracefully, and the slot drive protects the nut face so your assembly stays clean and true even after multiple service intervals.

Positive Locking, Even Under Vibration

For applications with shock or cyclic loading, our slotted round nuts are ready for a secondary lock. Align a slot with a cross-drilled shaft and add a cotter pin for a mechanical stop, or use compatible lock-retainer solutions where your specification calls for it. The goal is simple: once you’ve set the position, it stays set.

Fast, Clean Installation

A hook or pin spanner is all you need to install or remove our slotted round nuts quickly and safely. Square the seating surface, run the nut down to contact, and make controlled incremental turns to reach your target preload. Verify endplay or runout, align a slot if a cotter pin is specified, and you’re done—with a setup that’s easy to re-check after the first run-in.

FAQs

What is a slotted round nut used for in mechanical assemblies?

A slotted round nut is used to set and hold axial position on a threaded shaft, most often for bearing retention and preload. Its slot-driven design allows small, controlled adjustments so components seat precisely and remain secure through operation.

How does a slotted round nut differ from a standard round nut?

Unlike a plain round nut, a slotted round nut features outer slots that accept a hook or pin spanner, giving you better leverage, control, and repeatability. That interface helps you apply consistent torque and make micro-adjustments without marring faces or disturbing adjacent parts.

When should a slotted round nut be used with a cotter pin?

Use a cotter pin when your application faces vibration, shock loading, or safety-critical conditions where a mechanical secondary lock is required. Align a slot with the cross-drilled shaft hole after setting preload so the pin acts as a positive stop against rotation.

What tools are typically required to install or remove a slotted round nut?

A hook spanner or a pin spanner sized to the nut’s slot pattern is typically all that’s needed. These tools engage the outer slots securely, allowing controlled torque application for setting, checking, and re-setting preload during service.