
Nut — Hex lock 5/8-18
Nut — Hex lock 5/8-18
Application: EMD 645 and 710 series water pump assemblies
Part of our Water pump product line
The Nut — Hex Lock 5/8-18 is identified by EMD Part No. 8028724 and DLW Part No. 20355191. EMD parts references identify 8028724 as a 5/8-18 self-locking nut, while EMD water-pump component listings identify it as the Hex Lock 5/8-18 Nut. The part is listed as a component of EMD water-pump assemblies and is associated with both EMD 645 and 710 series applications. For procurement and maintenance, the nut should be identified by the correct EMD and DLW part numbers and the specified 5/8-18 thread size.
How This Part Works
The Nut — Hex Lock 5/8-18 is a threaded fastening component used within the EMD water-pump assembly. Its self-locking design is intended to help maintain the secured condition of the threaded connection during operation. Within the water-pump component arrangement, EMD 8028724 is listed alongside other pump components including the water-pump impeller, housing, seal retainer, seals, shaft, and associated hardware.
Signs It's Time to Replace
- Thread damage: damaged or deformed internal threads can affect proper installation and secure fastening
- Loss of locking function: deterioration of the self-locking feature can reduce the nut's ability to resist loosening
- Visible damage: cracking, deformation, or other physical damage should be assessed before reuse
- Corrosion: significant corrosion can affect the condition and serviceability of the nut
- Improper fit: a nut that does not correctly match the specified 5/8-18 threaded connection should not be used
Apex focuses on EMD engine components and water-pump system parts for EMD applications. The Nut — Hex Lock 5/8-18 is identified by the specific EMD Part No. 8028724 and DLW Part No. 20355191, allowing customers to source this fastening component using established EMD and DLW references. Its identification by part number and 5/8-18 thread specification helps customers select the correct nut for the applicable EMD water-pump assembly.
See all Water pump parts →- Engine Compatibility
- EMD 645 & EMD 710 Series
- Applications
- Locomotive · Marine · Power Generation
- Quality Standard
- ISO 9001:2015 Certified · OEM Grade






































