Description
An Industrial-Grade Gear Built for the Harshest Operating Conditions
The M6 75T Gear is a purpose-engineered spur gear combining a module of 6 with 75 teeth, delivering the kind of torque capacity and surface durability that procurement engineers in the UK construction and renewable energy sectors have come to depend on. The 22.5° pressure angle strikes a calculated balance between radial load and tooth bending strength — a geometry specifically favoured in applications involving shock loading or heavy cyclic stress, such as excavator swing drives and wind turbine pitch assemblies. Each gear is manufactured from a single piece of 18CrNiMO7-6 bar stock, rough machined, hobbed to precise tooth geometry, and then subjected to carburising and quenching before final finish grinding to DIN3963 Grade 6 tolerances. Every stage of the production process is documented, and full material traceability and hardness test reports ship with each batch as standard. For UK OEM engineers and MRO procurement managers who cannot afford gear failures in the field, the M6 75T Gear represents a sourcing decision backed by verified technical credentials.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | Gear |
| Model / Specification | M6 75T |
| Pressure Angle | 22.5° |
| Material | 18CrNiMO7-6 |
| Heat Treatment | Carburising & Quenching |
| Surface Hardness | HRC58–62 |
| Gear Accuracy Grade | DIN3963 Grade 6 |
| Typical Applications | Engineering Machinery, Wind Power Generation |
Five Reasons UK Engineers Specify the M6 75T Gear
⚙
DIN3963 Grade 6 — Batch-Consistent Accuracy
Every M6 75T Gear is manufactured and inspected against DIN3963 Grade 6 tolerances — a standard widely recognised within UK and European engineering supply chains. This means pitch error, profile deviation, and runout all fall within tightly controlled bands. The practical benefit for OEM assembly teams is that gears from different production batches fit and mesh predictably, eliminating time-consuming adjustment and reducing assembly scrappage.
🛡
HRC58–62 Case-Hardened Surface
The carburising and quenching process achieves a hard martensitic surface layer reaching HRC58–62 whilst the gear core retains its original toughness and ductility. This dual-property profile makes the M6 75T Gear highly resistant to pitting, micropitting, scuffing, and abrasive wear — the primary failure modes in industrial drivetrains. Extended surface life translates directly into longer maintenance intervals and lower total cost of ownership across the equipment’s lifecycle.
🌬
Validated Across UK Wind Energy Drivetrains
Wind turbine drivetrains are among the most demanding environments a gear can encounter — variable torque, temperature cycling, and limited accessibility for maintenance. The M6 75T Gear’s 18CrNiMO7-6 specification, certified heat treatment, and DIN accuracy make it a regularly specified component in pitch drive and yaw drive systems for onshore and offshore installations across England, Scotland, and Wales, including North Sea offshore platforms.
🏗
Proven in Heavy Construction & Civil Engineering
From hydraulic excavator swing mechanisms to crane slew drives and road-building machinery, the M6 75T Gear endures the shock loading and contamination exposure that characterise UK civil engineering sites. Its robust material specification and carburised case allow continued performance even where maintenance schedules are disrupted and operating conditions are far from ideal, reducing unplanned downtime on critical project timelines.
Material Science, Working Principle & Application Scenarios
Why 18CrNiMO7-6 Is the Material of Choice
18CrNiMO7-6 is a low-carbon case-hardening alloy steel conforming to EN ISO 683 material standards that are well-recognised across UK and European engineering specifications. The alloy’s chromium content (1.5–1.8%) significantly improves hardenability — meaning the steel achieves a consistent hardness gradient from the carburised surface through to the core, even in large cross-section components such as M6 module gears. Nickel (1.4–1.7%) is responsible for the steel’s outstanding toughness at low operating temperatures, which is highly relevant for wind turbine applications in exposed locations across Northern England, Scotland, and offshore sites. Molybdenum (0.25–0.35%) inhibits grain boundary embrittlement during the quenching stage, preventing micro-cracking in the heat-affected zone. The combination yields a gear blank that machines predictably, responds uniformly to carburising cycles, and achieves a clean, sharp hardness transition between case and core — all of which contribute to a gear that performs reliably well beyond its initial design life when properly specified and lubricated.
Carburising & Quenching: How the Heat Treatment Works
Carburising is a thermochemical process in which the machined gear is placed in a carbon-rich atmosphere at temperatures between 880°C and 930°C for a controlled diffusion period. Carbon migrates into the surface layer of the steel — typically to a case depth of 0.8–1.5 mm for M6 module gears — raising the carbon content of that zone from approximately 0.18% to near 0.8%. The gear is then quenched — rapidly cooled, most commonly in oil — which transforms the high-carbon surface into a hard martensite phase. The result is a surface hardness band of HRC58–62 overlaying a core that remains at roughly HRC30–38, preserving ductility and impact absorption capacity. Shot peening is optionally applied as a final step to introduce compressive residual stresses in the tooth root fillets, which extends fatigue life further by counteracting the tensile stresses induced during gear meshing. This complete treatment cycle is why the M6 75T Gear can be confidently specified in applications where continuous high torque and shock loading would rapidly destroy untreated or through-hardened alternatives.
Where the M6 75T Gear Is Deployed
Wind Power Generation
Pitch drive and yaw drive systems in onshore and offshore wind turbines across England, Scotland, and North Sea installations.
Construction Machinery
Swing drives and travel drives in hydraulic excavators, mobile cranes, and piling rigs on UK infrastructure projects.
Industrial Speed Reducers
Intermediate stage gears in parallel-shaft and planetary reducers for steel mills, cement plants, and aggregate processing.
Marine & Offshore
Winch drives, thruster gearboxes, and deck machinery aboard vessels in UK coastal and North Sea operating areas.
Customer Success: Proven Performance in the Field
Case Study · Offshore Wind · East Yorkshire Coast, United Kingdom
Extending Pitch Drive Gear Service Life by 40% for a North Sea Wind Developer
A UK-based offshore wind developer operating 3.6 MW turbines in the North Sea off East Yorkshire was experiencing premature pitch drive gear failures, with replacement intervals falling to just 18 months — well below the five-year target. Documentation audits of their existing supplier revealed no consistent material traceability and intermittent failures to meet stated DIN tolerances on delivered batches. The procurement team began sourcing alternative suppliers who could demonstrate certified compliance.
After switching to Ever Power’s M6 75T Gear, a 12-month pilot was run across six turbine pitch assemblies. Independent third-party inspection at the 12-month mark confirmed zero detectable tooth flank wear beyond DIN Grade 6 tolerance limits. Full hardness and material certification documents were verified against the delivered goods on every shipment. The client subsequently placed a standing annual order for 240 units, citing consistent DIN3963 Grade 6 compliance, verified hardness reports, and Ever Power’s responsive technical support as the primary factors in their decision.
+40%
Gear Service Life
240
Units / Year
DIN6
Certified Accuracy
★★★★★
“We have been sourcing M6 75T gears from Ever Power for our excavator swing drive assemblies for two years. Material certification arrives with every shipment and DIN Grade 6 compliance has been verified by our in-house metrology team on every batch. Lead time runs consistently at four weeks from order placement.”
James H. — Procurement Manager
Construction Equipment OEM · West Midlands, England
★★★★★
“For our offshore wind MRO operations in Scotland, gear supply reliability is non-negotiable. Ever Power consistently delivers M6 75T gears to specification — hardness tests, runout checks, all within DIN tolerances. Their technical team responded to application questions directly and professionally. We highly recommend them as a B2B gear supplier.”
Sarah M. — Engineering Director
Offshore Wind MRO Specialist · Aberdeen, Scotland
★★★★★
“We requested a custom gear modification — altered bore diameter and keyway to match our reducer housing. Ever Power responded with a detailed drawing within 48 hours and delivered the customised M6 75T gears on schedule. Dimensional accuracy was perfect. They are now our primary supplier for all large-module gear requirements.”
David K. — Technical Director
Industrial Gearbox Manufacturer · Leeds, England
Ever Power Manufacturing: Precision at Scale with Full Custom Service
Ever Power operates a vertically integrated manufacturing facility equipped with CNC gear hobbing centres, gear shaping machines, profile grinding lines, and automated heat treatment systems. Our in-house measurement laboratory uses Klingelnberg gear analysers and Zeiss coordinate measuring equipment to verify every gear against its specified DIN tolerance grade before shipment. All process documentation — including material mill certificates, hardness test reports, and gear inspection charts — ships with every order as standard practice, not as an optional extra.
Custom gear design and manufacturing is a core competency at Ever Power. UK OEM engineers and Tier 1 procurement teams regularly bring us specifications that are beyond the reach of standard catalogue suppliers — non-standard modules, unusual pressure angles, combined gear and shaft assemblies, matched pairs to specific backlash requirements. Our engineering team works directly from customer drawings, CAD models, or physical samples. Whether the requirement is five prototype gears for a development programme or 5,000 units supporting a production build, our flexible manufacturing cells accommodate both without compromising lead time or quality. We can also advise on material selection, heat treatment optimisation, and surface treatment choices to help UK engineers achieve the most cost-effective specification for their specific operating conditions.
Module Range
M1 through M20 and above — including non-standard modules to drawing
Material Options
18CrNiMO7-6, 20CrMnTi, 42CrMo4, and other European alloy steels on request
Accuracy Grades
DIN Grade 4 through Grade 9, ISO 1328, AGMA — available to order
Surface Treatments
Carburising, nitriding, induction hardening, phosphating — matched to application
Frequently Asked Questions
Source the M6 75T Gear for Your UK Project Today
Contact Ever Power’s technical sales team for a detailed quotation, material certification preview, or to discuss custom gear specifications. We supply UK OEMs, MRO teams, and engineering companies across England, Scotland, Wales, and Northern Ireland with consistently documented, certified precision gears.
EVER POWER · PRECISION GEAR MANUFACTURER · UK & GLOBAL INDUSTRIAL SUPPLY
edit by gzl
