Gear Oil 680

Product Overview

Gear Oil 680 is a high-viscosity industrial gear lubricant formulated for enclosed gear systems exposed to high mechanical loads, shock loading, and continuous operation. Its ISO VG 680 viscosity grade ensures the formation of a strong lubricating film, reducing direct metal-to-metal contact and minimizing wear under boundary and mixed lubrication regimes.

This lubricant is intended for applications where lower-viscosity gear oils may fail to maintain adequate film strength, particularly in slow-speed gear drives subjected to high torque and sustained loading.

Feature → Outcome

High viscosity at operating temperature → supports stable oil film formation → helps reduce surface fatigue and support longer gear service life under heavy load.

Operational Applications

Gear Oil 680 is suitable for industrial environments where gear systems operate at low to moderate speeds under sustained or intermittent heavy loads. Typical applications include enclosed spur, helical, bevel, and planetary gearboxes used in cement plants, mining and quarrying equipment, steel and metal processing lines, conveyors, mixers, and heavy-duty industrial drives.

It can be applied in both splash lubrication and circulation systems, provided operating temperatures and start-up conditions remain within the recommended range. For related products and alternative viscosity grades, explore our Industrial Gear Oils portfolio.

Technical Specifications

Gear Oil 680 conforms to internationally recognized industrial gear oil classifications and viscosity standards. The ISO VG 680 grade defines its kinematic viscosity at 40 °C, positioning it for applications requiring maximum load-carrying capability and film strength.

The formulation is aligned with DIN 51517-3 (CLP) and ISO 12925-1 requirements for enclosed industrial gear oils, ensuring compatibility with common gearbox designs and materials when used in accordance with manufacturer recommendations.

Performance Characteristics

The high-viscosity profile of Gear Oil 680 delivers high load-carrying performance in slow-speed gear systems where hydrodynamic lubrication is difficult to maintain. Strong oil film strength helps protect gear teeth and bearings against scuffing, micropitting, and surface fatigue.

Thermal stability and oxidation resistance support extended oil service life under appropriate operating conditions, even in continuously operating systems with elevated sump temperatures.

Explained example
 In a heavily loaded conveyor gearbox operating at low shaft speeds, lower-viscosity oils may be squeezed out of the contact zone. Gear Oil 680 maintains sufficient film thickness under these conditions, reducing wear and minimizing unplanned downtime.

Compatibility & Limitations

Gear Oil 680 is compatible with most ferrous materials, common sealing materials, and gearbox designs intended for CLP-class oils. It is not recommended for high-speed gearboxes where excessive viscosity may cause increased energy losses, elevated operating temperatures, or inadequate oil circulation.

In cold environments with frequent low-temperature start-ups, the high viscosity of ISO VG 680 may impair oil flow during start-up. In such cases, selecting a lower-viscosity grade or a synthetic gear oil may provide better overall performance.

Definition notes
 High speed: gear systems with elevated pitch line velocity
Cold environment: repeated start-ups at low ambient temperatures

Selection Guidance

Choose Gear Oil 680 when operating conditions involve high loads, slow rotational speeds, and a requirement for maximum lubricating film strength. It is particularly suitable for shock-loaded gearboxes and applications where wear protection and component durability are prioritized over energy efficiency.

If operating speeds are higher, ambient temperatures are low, or energy efficiency is critical, a lower-viscosity grade such as Gear Oil 460 or a synthetic alternative may be more appropriate. Selecting an excessively high viscosity can increase friction losses and reduce system efficiency.

Compliance & Standards

Gear Oil 680 is formulated in line with internationally accepted industrial gear oil standards, supporting use in a wide range of OEM-neutral applications. Always consult gearbox manufacturer specifications to confirm viscosity grade and performance requirements prior to application.

Industrial FAQ

Is Gear Oil 680 suitable for splash lubrication?
 Yes, provided operating temperatures allow adequate oil flow and distribution.

Can Gear Oil 680 be used in shock-loaded gearboxes?
 Yes. The high viscosity provides strong film protection under shock and heavy load conditions.

What happens if viscosity is too high for my system?
 Excessive viscosity may increase power losses, raise operating temperatures, and impair lubrication during start-up.