12990023 – Castle Nut 3/4-16 tackling difficult yard waste Designed as a direct-fit replacement

Designed as a direct-fit replacement for STIHL trimmer heads

and tight spaces

The STIHL Screw Plug (4227 700 2300) is a genuine OEM replacement plug used on select STIHL blowers and sprayers

6 in / 141

12990023 – Castle Nut 3/4-16 tackling difficult yard waste Designed as a direct-fit replacement12990023 Castle Nut 3 4 16 The 12990023 Castle Nut is a heavy duty 3 4 16 slotted fastener designed for secure fastening in applications that require mechanical locking with a cotter pin. Commonly used on mower spindles, wheel hubs, steering components, and rotating assemblies, this castle nut allows precise torque adjustment while preventing rotation or loosening during operation. Manufactured from high strength steel and built to standard fastener