Industrial Gear Oil South Africa — ISO VG Selection Guide
The complete guide to industrial enclosed gearbox lubrication — ISO VG grades, Mobilgear 600 XP mineral and Mobilgear SHC synthetic series, Flender approvals, micropitting and bulk supply for mining, manufacturing and processing plant operations across South Africa.
What Is Industrial Gear Oil?
Industrial gear oil is a specialised lubricant engineered for enclosed gearboxes in factories, mines and processing plants. It is classified by ISO Viscosity Grade (ISO VG) and AGMA class — not by API GL rating. It must withstand continuous operation, high thermal loads and the crushing contact stress of gear tooth surfaces across shifts and seasons.
Industrial gear oil is not the same as automotive gear oil. Automotive GL-5 axle oils contain sulphur-phosphorus extreme-pressure additives that are corrosive to the yellow metal bearings and thrust washers used in many industrial gearboxes. Using GL-5 in an enclosed industrial gearbox voids OEM warranties and causes equipment damage.
Continuous Operation
Industrial gearboxes run continuously under sustained load and elevated temperature. They require oils with outstanding oxidation stability, thermal resistance and long service life — not the intermittent-duty formulations used in vehicle axles.
ISO VG Classification
Industrial gear oils are classified by ISO Viscosity Grade — the number represents nominal viscosity in cSt at 40°C. The correct grade is determined by the gearbox OEM based on gear geometry, shaft speed, load and operating temperature. Always read the nameplate.
OEM Approvals Matter
Leading industrial gearbox manufacturers publish specific approval lists — Flender BA 7300, SEW-Eurodrive, Nord, Lenze. Using an approved product protects your OEM warranty and provides technical accountability for specification decisions.
The Cost of Getting It Wrong
Industrial gearbox replacement on a conveyor or mill drive costs R300,000 to R2,000,000+. In mining operations, a gearbox failure means production halts measured in shifts. Correct lubricant specification is a production continuity decision, not a procurement shortcut.
ISO VG Grade Selection
The ISO VG number represents the nominal kinematic viscosity of the oil in centistokes at 40°C. The correct grade is determined by the gearbox OEM based on gear geometry, speed, load and operating temperature. Always verify from the gearbox nameplate or OEM documentation before ordering.
| ISO VG Grade | Viscosity @ 40°C | AGMA Class | Typical Application in SA Industry |
|---|---|---|---|
| ISO 68 | 68 cSt | 2 EP | High-speed lightly loaded gearboxes, small helical reducers, food and beverage drives |
| ISO 100 | 100 cSt | 3 EP | Medium-speed general purpose gearboxes, packaging lines, light conveyor drives |
| ISO 150 | 150 cSt | 4 EP | General industrial gearboxes, agitators, fans, light conveyor drives, pump gearboxes |
| ISO 220 | 220 cSt | 5 EP | Most common grade. Medium-duty enclosed gearboxes, conveyor drives, mixers, screens across SA mining and manufacturing |
| ISO 320 | 320 cSt | 6 EP | Heavily loaded gearboxes, slower speed drives, extruders, presses, large conveyor head drives |
| ISO 460 | 460 cSt | 7 EP | Slow-speed high-load gearboxes, bucket wheel drives, crusher drives, ball and rod mill gearboxes |
Mobilgear Industrial Gear Oil Range
Mobilgear 600 XP covers standard industrial applications with mineral base oil. Mobilgear SHC delivers extended drain, wide temperature range and superior micropitting protection with full synthetic PAO base.
Mobilgear 600 XP Series
Extra high-performance mineral gear oil for all types of enclosed gear drives. Formulated for outstanding EP load-carrying, micropitting resistance and thermal stability across the full ISO VG grade range. The benchmark mineral industrial gear oil for South African mining and manufacturing.
Key specs: VI 97 · FZG micropitting Stage 10/High · FE8 wear 2mg · FZG scuffing Stage 12+ · Max 100°C bulk oil
OEM approvals: Flender BA 7300 · AGMA 9005-F16 · DIN 51517-3 · ISO 12925-1 CKD/CKC
Mobilgear SHC Series
Supreme performance synthetic gear oil from PAO base stocks for severe-duty enclosed gear drives. Engineered to resist micropitting on case-hardened gear tooth metallurgies and deliver extended drain intervals in continuous-operation equipment. The correct choice where standard mineral gear oil cannot meet the thermal, micropitting or service interval requirement.
Key specs: VI 176 to 184 · Pour point -54 to -45°C · FZG micropitting Stage 10/High · FZG scuffing Stage 14+ (maximum)
Best for: Continuous-duty mining gearboxes · Case-hardened gearing · High temperatures · Extended drain programmes
Industrial Application Guide
| Equipment / Application | Typical ISO VG | Recommended Product |
|---|---|---|
| Conveyor head drive gearboxes (general duty) | ISO 220 to 320 | Mobilgear 600 XP 220 / 320 or Mobilgear SHC 220 / 320 for extended drain |
| Crusher drive gearboxes (jaw, cone, impact) | ISO 320 to 460 | Mobilgear 600 XP 320 / 460 or Mobilgear SHC 320 / 460 for extended drain |
| Ball mill and rod mill gearboxes | ISO 460 | Mobilgear 600 XP 460 or Mobilgear SHC 460 |
| Bucket wheel drive gearboxes | ISO 460 | Mobilgear 600 XP 460 or Mobilgear SHC 460 for extended drain |
| Extruder and mixer gearboxes | ISO 220 to 460 | Mobilgear 600 XP 220 to 460 or SHC series for extended drain |
| Industrial fans and blower gearboxes | ISO 150 to 220 | Mobilgear 600 XP 150 / 220 or Mobilgear SHC 150 / 220 |
| Case-hardened high-power-density gearboxes | ISO 320 to 460 | Mobilgear SHC 320 / 460 — micropitting-critical applications |
| Mine winder and hoist gearboxes | ISO 460 | Mobilgear 600 XP 460 — confirm OEM and regulatory spec |
Mineral vs Synthetic Industrial Gear Oil
For high-utilisation mining and manufacturing operations, the choice between Mobilgear 600 XP and Mobilgear SHC is a commercial and technical decision. The mineral product is not inferior — it is the appropriate choice for many applications. The synthetic earns its premium only where the operating conditions or maintenance requirements justify it.
How to Select the Right Industrial Gear Oil
Read the Gearbox Nameplate
The gearbox nameplate or equipment manual specifies the exact lubricant required: "ISO VG 220 EP", "AGMA 5 EP", "DIN 51517-3 CLP 220" or a brand approval like "Flender BA 7300". Never guess the grade from machine size or load alone. Contact Orbit Industrial if the nameplate is worn or missing.
Confirm Industrial vs Automotive Application
Enclosed industrial gearboxes in plants and mines use ISO VG industrial gear oils. Vehicle axles and manual gearboxes use API GL automotive gear oils. These are not interchangeable. If your application is automotive fleet or transmission, visit our Automotive and Transmission Oil page.
Match Viscosity to Operating Temperature
The ISO VG grade is matched to expected bulk oil temperature and shaft speed by the gearbox OEM. Northern Cape mining operations in summer may push sump temperatures to 110°C or above, favouring higher viscosity or synthetic formulations that maintain adequate film at elevated temperature.
Evaluate Micropitting Risk
If your gearbox uses case-hardened gearing — common in modern high-power-density gearboxes from Flender, SEW, Lenze and Nord — micropitting is a specific failure risk. Mobilgear SHC is engineered for this failure mode. Confirm gear tooth metallurgy with your OEM documentation before specifying mineral vs synthetic.
Calculate TCO Not Price Per Litre
Mobilgear SHC costs more per litre than 600 XP. For continuous-operation equipment the relevant comparison is total cost over 3 to 5 years — drain interval, oil change labour, waste disposal and avoided gearbox failure cost. Contact Orbit Industrial for a fleet-specific analysis.
Industrial Gear Oil FAQ
Check the gearbox nameplate — the metal plate fixed to the gearbox housing. It will typically state the required lubricant as "ISO VG 220 EP", "AGMA 5 EP", "DIN 51517-3 CLP 220" or a brand-specific approval like "Flender BA 7300". If the nameplate is worn or missing, check the OEM manual using the gearbox make, model and serial number. Contact Orbit Industrial with the gearbox details and our technical team will identify the correct grade.
No. Automotive GL-5 and industrial ISO VG gear oils are formulated for fundamentally different applications. GL-5 contains aggressive sulphur-phosphorus EP additives designed for intermittent hypoid gear shock loading. These additives are corrosive to yellow metal bearings and thrust washers used in many industrial gearboxes. Industrial gearboxes carry AGMA, DIN 51517-3 and ISO 12925-1 classifications, not API GL ratings. Using GL-5 in an industrial gearbox voids OEM warranties and risks equipment damage.
Yes in most cases. Mobilgear 600 XP holds Flender BA 7300 Table A approval, which is the most widely installed gearbox brand in South African mining and processing plants. It also meets DIN 51517-3 and AGMA 9005-F16, which covers the majority of SEW-Eurodrive and Nord specifications. You still need to match the correct ISO VG grade to each unit from the nameplate. Contact Orbit Industrial for cross-referencing grades across a mixed gearbox fleet.
Micropitting is a surface fatigue failure mode affecting hardened gear tooth surfaces — particularly in modern high-power-density gearboxes with case-hardened gearing. It begins as microscopic cracks at the gear tooth surface, creating a grey frosted appearance. If undetected, micropitting progresses to macropitting (spalling), removing material from the tooth surface, increasing vibration and leading to tooth fracture and catastrophic gearbox failure.
Mobilgear 600 XP achieves FZG Stage 10 / High micropitting rating. Mobilgear SHC's PAO base and proprietary additive system was specifically engineered for micropitting in case-hardened gear applications. If your OEM specifies micropitting resistance, verify your gear oil meets the requirement before ordering.
Mobilgear 600 XP (Mineral): Typical intervals of 3,000 to 6,000 hours under normal conditions, or annually whichever comes first. Higher temperatures and contamination-prone mining environments trend toward shorter intervals.
Mobilgear SHC (Synthetic): Extended intervals of 6,000 to 12,000+ hours achievable when validated through regular oil analysis. The PAO base stock's superior oxidation resistance enables these extended intervals.
Best practice: implement a routine oil analysis programme — sample gearbox oil every 1,000 to 2,000 hours and analyse for viscosity, oxidation, water content and wear metals. Contact Orbit Industrial to discuss oil analysis support.
Yes. Orbit Industrial supports mining sector tenders and large-scale industrial SLA contracts. We supply Mobilgear 600 XP and Mobilgear SHC in 20 litre pails, 208 litre drums, 1,000 litre IBCs and bulk tanker delivery. We provide certified product data sheets, safety data sheets, OEM approval confirmation and tender compliance documentation. Coverage: Western Cape, Northern Cape, Garden Route and Gauteng.
Need the Right Industrial Gear Oil for Your Gearbox Fleet?
From ISO VG 100 general purpose drives to ISO VG 460 mine winder gearboxes — Orbit Industrial provides application-specific gear oil selection, OEM cross-referencing and bulk supply across South Africa.
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