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Dual-Hardness Engineering

A carburised case hardened to HRC 58–62 resists surface wear and pitting, while the HRC 35–42 core absorbs heavy shock loads. This layered hardness profile is the foundation of long gear life in tough tractor gearboxes running in muddy, high-load British field conditions.

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DIN 3963 Grade 8 Precision

All tooth profile, pitch, and runout tolerances are controlled to DIN 3963 Grade 8, ensuring that each gear meshes evenly with its counterpart and distributes load uniformly across the full tooth face. Consistent accuracy from batch to batch reduces vibration, noise, and premature fatigue failure in assembled gearboxes.

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16MnCr5 Premium Steel

16MnCr5 is a case-hardening steel defined by EN 10084 and widely specified by European tractor OEMs for gear applications. Its chromium-manganese alloying provides excellent hardenability, a clean microstructure after carburising, and reliable through-thickness mechanical properties — making it the material of choice for high-cycle transmission components worldwide.

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Optimised Helix Geometry

The 8° helix angle increases the contact ratio versus a spur gear, spreading instantaneous tooth load over a greater overlap length. Combined with a 22.5° pressure angle that improves tooth bending strength, this geometry delivers measurably quieter and smoother power transfer during the variable-speed engagement cycles typical in agricultural drivetrain work.

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Extended Service Intervals

The 0.8–1.2 mm carburised case depth provides a substantial hardened reserve that withstands prolonged wear without exposing the softer substrate. For operators running multi-shift harvest schedules across hundreds of hectares, this translates to fewer unplanned gearbox repairs, reduced downtime, and lower total lifecycle cost per hectare cultivated.

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Full OEM & Custom Capability

Beyond standard M5.25 Z38 stock, Ever Power engineers can modify module, tooth count, bore diameter, keyway geometry, and surface treatment to match your exact drivetrain requirements. Every custom programme is supported by dimensional inspection reports and material certifications, ensuring traceability that satisfies the most demanding OEM supplier qualification processes.

● 16MnCr5 Steel Composition

16MnCr5 is an established European case-hardening steel specified under EN 10084. Its nominal composition — approximately 0.14–0.19% carbon, 1.0–1.3% manganese, and 0.8–1.1% chromium — delivers a careful balance of carburising depth consistency, hardenability, and machinability. The relatively low base carbon content ensures that the core retains ductility and impact toughness even after the surface carburising step, which is what gives this steel its characteristic dual-hardness capability. For high-cycle drivetrain gears subjected to alternating bending and contact stress, 16MnCr5 outperforms plain carbon steels by a significant margin in both fatigue life and dimensional stability after heat treatment.

● Carburising & Quenching Sequence

Each M5.25 Z38 gear passes through a continuous-atmosphere furnace carburising cycle at temperatures in the 880–940 °C range. Carbon is diffused into the surface layer to a controlled depth of 0.8–1.2 mm, building a carbon gradient that, after direct oil quenching, transforms into a hard martensite case at HRC 58–62. The core, shielded from carbon enrichment, retains a bainitic/martensitic microstructure with HRC 35–42. A post-quench low-temperature tempering step relieves residual stress and restores dimensional stability within drawing tolerances. The complete thermal process is carried out under documented, repeatable furnace parameters, and hardness is spot-checked per batch using calibrated Rockwell instruments traceable to national standards.

🌿 Arable & Cereal Farming

Heavy tractors working across flat arable land in Lincolnshire, East Anglia, and the Yorkshire Wolds place sustained torque demands on the 3rd-gear drive train. The M5.25 Z38 gear handles these conditions reliably through multi-day cultivation and drilling campaigns.

🍾 Hill Farming & Livestock

Gradient loading on upland farms in Wales, Cumbria, and the Scottish Highlands requires a gearbox gear that can absorb shock reversals and directional changes. The case-hardened M5.25 Z38 gear copes with uneven loading cycles without the tooth chipping risks seen in under-specified alternatives.

🏗 OEM Tractor Assembly Lines

Tractor manufacturers requiring consistently graded, inspected, and traceable gear components for transmission sub-assembly will find that the M5.25 Z38 fits directly into standard OEM build programmes with no secondary rework, reducing assembly line cycle time.

🔧 Agricultural Service & Repair

Engineering workshops across rural Britain servicing major tractor brands will find the M5.25 Z38 specification matches a broad range of legacy and current transmission designs. Holding a small batch of these gears as service stock reduces customer downtime and strengthens workshop turnaround times at peak harvest periods.

“We’ve been sourcing M5.25 Z38 gears from Ever Power for three years now. The hardness consistency between batches is genuinely impressive, and their lead times are very competitive for a UK OEM programme of our size. Highly recommended for any agricultural transmission application.”

— James Hartley, Procurement Director  |  Greenfield Tractor Works Ltd, Yorkshire

“As a specialist agricultural parts distributor serving farming customers across East Anglia, we need gears that arrive already proven. Ever Power’s documentation and dimensional traceability make our incoming inspection straightforward. Farmers notice the quality difference almost immediately when the tractor feels quieter in 3rd gear.”

— Rachel Turner, Technical Sales Manager  |  AgriParts Direct Ltd, Norfolk

“Our workshop strips a lot of tractor gearboxes each autumn. When we switched to Ever Power’s M5.25 Z38 for 3rd-gear replacements, the number of repeat failures dropped noticeably. The 16MnCr5 material and proper carburising depth make a real difference in how long the gear lasts in a hard-working UK tractor.”

— Scott McAllister, Workshop Manager  |  Highland Agricultural Services, Perthshire

Ever Power operates a dedicated gear manufacturing plant equipped with modern CNC gear-hobbing machines, precision gear-grinding centres, and a controlled-atmosphere continuous carburising furnace line. The facility runs ISO 9001-aligned quality processes with calibrated CMM inspection and hardness verification at every production stage. Dimensional inspection reports and material test certificates are generated per batch and can be supplied to customers as standard documentation — a commitment that supports OEM supplier qualification requirements across the UK, European, and North American markets.

Beyond standard catalogue items, our engineering team actively supports custom gear design programmes. From a customer drawing, a worn sample, or a brief specification, Ever Power can develop and produce gears with modified module, altered tooth count, non-standard bore and keyway configurations, bespoke helix and pressure angles, and alternative heat-treatment specifications. Custom gear production is supported by reverse engineering, gear metrology reporting, and prototype approval batches — giving UK OEMs a complete development-to-production partner for transmission gear requirements of any complexity.

Custom Gear Enquiry

• Module: M1–M20+
• Tooth forms: spur, helical, bevel
• Materials: 16MnCr5, 20CrMnTi, 42CrMo4, stainless
• Heat treatment: carburising, nitriding, induction
• Quantity: prototype to full OEM volume
• Lead time: quoted per programme

✉  Get a Quote

[email protected]

From arable farming regions in Lincolnshire and East Anglia to upland livestock farms in the Scottish Highlands and the mixed agricultural valleys of Wales, the need for reliable tractor transmission components spans every corner of Britain. Ever Power maintains a structured supply programme specifically calibrated to the order patterns of UK distributors and OEM buyers, with flexible MOQ options, scheduled blanket-order agreements, and documentation packages aligned to British and European procurement standards. All goods are dispatched with full commercial documentation and traceable inspection records, simplifying goods-in processes and facilitating downstream quality audits. Whether you are based in the agricultural hubs of East Yorkshire, the Midlands, or in the farming communities of the South West, Ever Power provides a consistent, technically supported supply channel for precision agricultural gears that keeps your business moving through every season.

Ever Power is a specialist precision gear manufacturer with over 18 years of applied experience in agricultural transmission components. For UK tractor OEMs, the key criteria when selecting an M5.25 Z38 gear supplier are consistent DIN 3963 Grade 8 dimensional accuracy, traceable heat-treatment records, 16MnCr5 material certification, and flexible supply scheduling. Ever Power meets all of these requirements and backs each shipment with a full documentation package. You can request pricing and supplier qualification information by emailing [email protected].

Carburising diffuses additional carbon into the surface layer of the steel, typically to a depth of 0.8–1.2 mm in the case of the M5.25 Z38 gear. When the part is then oil-quenched, this carbon-enriched case transforms into hard martensite (HRC 58–62), which resists abrasive wear, surface pitting, and contact fatigue. The unchanged core retains ductility at HRC 35–42, absorbing impact loads without fracture. This combination extends gear service life in agricultural applications by a factor of two to four compared with through-hardened or untreated alternatives.

UK agricultural equipment companies can request a detailed price quotation directly from Ever Power by emailing [email protected]. Quotes are typically issued within one business day and include unit pricing at your stated quantity, tooling implications for non-standard specifications, lead time, and documentation scope. Ever Power accommodates both small prototype batches and high-volume OEM programmes, with blanket-order pricing available for companies with predictable annual consumption.

Both 16MnCr5 and 20CrMnTi are proven case-hardening steels for transmission gears. 16MnCr5 is the European standard (EN 10084) and is widely available within UK and EU supply chains, making it the preferred choice for European OEM programmes where traceability to EN standards is required. 20CrMnTi is a Chinese national standard steel with very similar mechanical properties after carburising; it is commonly used in cost-optimised production programmes. For UK agricultural applications with demanding OEM documentation requirements, 16MnCr5 is generally the preferred specification. Cost differences are typically marginal at equivalent quality grades.

Replacement should be considered when any of the following are observed: progressive gear whine or rattle in 3rd range under load; visible pitting, chipping, or ridging on tooth flanks during inspection; increased backlash beyond manufacturer tolerance on the transmission shaft; or a history of oil contamination with metallic fines consistent with gear wear. Preventive replacement is also worth scheduling during major gearbox rebuilds on tractors with high hour counts. Sourcing a quality M5.25 Z38 gear before the harvest season begins avoids costly downtime at peak operational periods.

DIN 3963 Grade 8 is the standard specified for medium-duty agricultural tractor transmission gears and is what Ever Power produces the M5.25 Z38 to. For lighter-duty or cost-focused applications, Grade 9 or 10 may be acceptable, but these involve wider tolerances on tooth profile and pitch that can result in increased noise and shorter fatigue life under sustained load. For high-performance or specialised transmissions, Grade 6 or 7 may be warranted. If you are unsure which grade matches your existing gearbox specification, Ever Power’s technical team can advise based on your application brief.

Unit pricing for M5.25 Z38 gears depends on quantity, tolerance grade, material certification requirements, and any custom modifications to the standard specification. As a general guide, small trial batches of 20–50 pieces carry a higher per-unit cost than OEM-volume orders of 500+ per run. Ever Power does not publish fixed price lists online because each enquiry is assessed on its individual technical scope and volume profile. The most efficient route to a firm quotation is to email [email protected] with your quantity, any drawing or dimensional reference, and your target delivery timeline.