Slotted Nut, 5/8"-18

Slotted Nut, 5/8"-18

The 5/8"-18 Slotted Nut is a precision-threaded fastening nut designed for secure mechanical assemblies that require locking with a cotter pin. The slotted design aligns with a drilled bolt or spindle, allowing a cotter pin to pass through and prevent the nut from loosening under vibration or movement. Built from durable steel with fine 5/8"-18 threads, this nut is commonly used in axles, hubs, agricultural equipment, and machinery where reliability and safety matter—because a nut that stays put is always preferable to one that decides to wander off mid-operation.

Country of Origin
Varies by production batch

Key Features / Specifications

• Product Type: Slotted nut / castellated-style locking nut
• Thread Size: 5/8"
• Thread Pitch: 18 TPI (fine thread)
• Thread Type: UNF fine thread
• Design: Slotted top for cotter pin locking
• Material: Steel construction
• Function: Prevents loosening when used with cotter pin
• Compatibility: Fits 5/8"-18 threaded bolts or spindles
• Application Type: Mechanical assemblies requiring positive locking
• Installation: Tighten to alignment point, then insert cotter pin through slots

Ideal For

• Axle, hub, and spindle assemblies
• Agricultural and farm equipment repairs
• Machinery requiring vibration-resistant fastening
• Applications where a cotter pin locking system is required
• Mechanics who prefer hardware that stays exactly where it was tightened