Thermo King Square Key Shaft Coupling Refrigeration Unit 550351
Official OEM Thermo King parts catalog entry for the Thermo King Square Key 550351, verified by PEAK Thermo King and West Texas Thermo King Texas, Utah, Wyoming, Washington, Oregon, serving all of the USA.
Built for Performance: The Thermo King Square Key 550351 supports Thermo King refrigeration systems with OEM-grade mechanical engagement that preserves torque transfer and alignment in temperature-controlled drive systems. This precision component helps fleets maintain consistent temperature control and maximize uptime across demanding transport refrigeration operations.
The Thermo King Square Key 550351 fits within industry-standard keyway interfaces and provides a reliable mechanical connection between rotating assemblies used in reefer trailer and truck refrigeration components. West Texas Thermo King supplies this genuine Thermo King component to ensure dependable service life across Smart Reefer SR-4, Precedent S-610M, S-610DE, and Diesel Direct Electric configurations where applicable.
- OEM Compatibility – Ensures direct fit and secure engagement within Thermo King assemblies to reduce installation time and alignment issues.
- Durable Construction – Manufactured to withstand mechanical stresses common in transport refrigeration, supporting long-term fleet reliability.
- Precision Engagement – Maintains accurate torque transfer between shaft and hub to protect bearings and seals from premature wear.
- Uptime Focused – Supports fast field replacement during preventive maintenance and repairs to minimize refrigeration downtime.
- Fleet-Ready – Suited for reefer trailer and refrigerated truck applications across West Texas operations, promoting consistent temperature control.
Product Details
The Thermo King Square Key 550351 is an OEM-specified mechanical key designed for secure square-keyway engagement in Thermo King transport refrigeration components. Specific dimensions and material specifications follow Thermo King engineering standards and are verified through West Texas Thermo King parts validation. For exact fitment confirmation by model or assembly, reference unit serial data or contact certified service technicians to verify compatibility with Smart Reefer SR-4, Precedent series, or Diesel Direct Electric systems.
Efficiency & Sustainability
The Thermo King Square Key 550351 contributes to efficient refrigeration operation by maintaining precise mechanical alignment and reducing component wear that leads to energy loss. Proper mechanical engagement helps systems sustain temperature control and fuel-efficient cooling, supporting regulatory-compliant operations such as those integrating Smart Reefer SR-4 telematics or CARB Evergreen priorities where applicable. Reliable components reduce unplanned part replacement and lower environmental impact associated with expedited logistics and service calls.
Installation & Maintenance Tips
Install the Thermo King Square Key 550351 using OEM-recommended procedures: verify keyway cleanliness, align the shaft and hub before inserting the key, and secure components with manufacturer-specified fasteners. Inspect the key and mating surfaces during scheduled maintenance intervals and replace if signs of deformation or excessive wear appear. Use Thermo King-recommended torque values and replace associated seals or bearings when necessary to preserve system integrity.
Real-World Applications
The Thermo King Square Key 550351 fits applications within reefer trailers, refrigerated trucks, and transport refrigeration units where square-key mechanical engagement ensures precise torque transfer—commonly found in compressor couplings, fan drives, and motor shafts. Service technicians rely on genuine Thermo King parts for predictable performance across long-haul and last-mile refrigerated operations in the Permian Basin and broader West Texas region.
Available for installation and service in Amarillo, Lubbock, Odessa, and throughout West Texas.
View all Thermo King PartsBacked by Thermo King’s engineering and supported by certified technicians at West Texas Thermo King, this component delivers lasting performance and uptime assurance for fleet operations.
For product verification or service assistance, call (806) 376-5837.
For current warranty eligibility or OEM replacement coverage, please contact us for warranty information at https://www.trailerservicesofwesttexas.com/contact or call our service department for confirmation.
Frequently Asked Questions
Q: Is the Thermo King Square Key 550351 compatible with Precedent-series units?
A: Compatibility depends on the specific assembly and serial number. This OEM key is intended for Thermo King mechanical interfaces; contact certified technicians to verify model-level fitment.
Q: How often should this key be inspected during fleet maintenance?
A: Inspect the key and mating keyways during routine preventive maintenance and whenever drivetrain or shaft components are serviced to ensure continued alignment and reliable torque transfer.
Q: Can this part support Diesel Direct Electric and Smart Reefer-equipped systems?
A: Yes, the Thermo King Square Key 550351 supports mechanical connections used in Diesel Direct Electric and Smart Reefer SR-4 enabled systems when matched to the correct assembly and model specifications.
Ask about fleet-wide parts programs through West Texas Thermo King.
Produced by a certified Thermo King dealership, West Texas Thermo King | a Division of PEAK Industrial. Servicing fleets across Amarillo, Lubbock, and Odessa.
Official OEM Thermo King parts catalog entry for the Thermo King Square Key 550351, verified by PEAK Thermo King and West Texas Thermo King Texas, Utah, Wyoming, Washington, Oregon, serving all of the USA.
Built for Performance: The Thermo King Square Key 550351 supports Thermo King refrigeration systems with OEM-grade mechanical engagement that preserves torque transfer and alignment in temperature-controlled drive systems. This precision component helps fleets maintain consistent temperature control and maximize uptime across demanding transport refrigeration operations.
The Thermo King Square Key 550351 fits within industry-standard keyway interfaces and provides a reliable mechanical connection between rotating assemblies used in reefer trailer and truck refrigeration components. West Texas Thermo King supplies this genuine Thermo King component to ensure dependable service life across Smart Reefer SR-4, Precedent S-610M, S-610DE, and Diesel Direct Electric configurations where applicable.
- OEM Compatibility – Ensures direct fit and secure engagement within Thermo King assemblies to reduce installation time and alignment issues.
- Durable Construction – Manufactured to withstand mechanical stresses common in transport refrigeration, supporting long-term fleet reliability.
- Precision Engagement – Maintains accurate torque transfer between shaft and hub to protect bearings and seals from premature wear.
- Uptime Focused – Supports fast field replacement during preventive maintenance and repairs to minimize refrigeration downtime.
- Fleet-Ready – Suited for reefer trailer and refrigerated truck applications across West Texas operations, promoting consistent temperature control.
Product Details
The Thermo King Square Key 550351 is an OEM-specified mechanical key designed for secure square-keyway engagement in Thermo King transport refrigeration components. Specific dimensions and material specifications follow Thermo King engineering standards and are verified through West Texas Thermo King parts validation. For exact fitment confirmation by model or assembly, reference unit serial data or contact certified service technicians to verify compatibility with Smart Reefer SR-4, Precedent series, or Diesel Direct Electric systems.
Efficiency & Sustainability
The Thermo King Square Key 550351 contributes to efficient refrigeration operation by maintaining precise mechanical alignment and reducing component wear that leads to energy loss. Proper mechanical engagement helps systems sustain temperature control and fuel-efficient cooling, supporting regulatory-compliant operations such as those integrating Smart Reefer SR-4 telematics or CARB Evergreen priorities where applicable. Reliable components reduce unplanned part replacement and lower environmental impact associated with expedited logistics and service calls.
Installation & Maintenance Tips
Install the Thermo King Square Key 550351 using OEM-recommended procedures: verify keyway cleanliness, align the shaft and hub before inserting the key, and secure components with manufacturer-specified fasteners. Inspect the key and mating surfaces during scheduled maintenance intervals and replace if signs of deformation or excessive wear appear. Use Thermo King-recommended torque values and replace associated seals or bearings when necessary to preserve system integrity.
Real-World Applications
The Thermo King Square Key 550351 fits applications within reefer trailers, refrigerated trucks, and transport refrigeration units where square-key mechanical engagement ensures precise torque transfer—commonly found in compressor couplings, fan drives, and motor shafts. Service technicians rely on genuine Thermo King parts for predictable performance across long-haul and last-mile refrigerated operations in the Permian Basin and broader West Texas region.
Available for installation and service in Amarillo, Lubbock, Odessa, and throughout West Texas.
View all Thermo King PartsBacked by Thermo King’s engineering and supported by certified technicians at West Texas Thermo King, this component delivers lasting performance and uptime assurance for fleet operations.
For product verification or service assistance, call (806) 376-5837.
For current warranty eligibility or OEM replacement coverage, please contact us for warranty information at https://www.trailerservicesofwesttexas.com/contact or call our service department for confirmation.
Frequently Asked Questions
Q: Is the Thermo King Square Key 550351 compatible with Precedent-series units?
A: Compatibility depends on the specific assembly and serial number. This OEM key is intended for Thermo King mechanical interfaces; contact certified technicians to verify model-level fitment.
Q: How often should this key be inspected during fleet maintenance?
A: Inspect the key and mating keyways during routine preventive maintenance and whenever drivetrain or shaft components are serviced to ensure continued alignment and reliable torque transfer.
Q: Can this part support Diesel Direct Electric and Smart Reefer-equipped systems?
A: Yes, the Thermo King Square Key 550351 supports mechanical connections used in Diesel Direct Electric and Smart Reefer SR-4 enabled systems when matched to the correct assembly and model specifications.
Ask about fleet-wide parts programs through West Texas Thermo King.
Produced by a certified Thermo King dealership, West Texas Thermo King | a Division of PEAK Industrial. Servicing fleets across Amarillo, Lubbock, and Odessa.
