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Quick Specifications
| Grade | DIN6 International Grade 5 |
| Material | 40Cr / 20CrMnTi |
| Tooth Type | Helical (Oblique) |
| Helix Angle | 19°31’42” |
| Hardness (40Cr) | HRC 48–52 (Induction) |
| Hardness (20CrMnTi) | HRC 50–55 (Carburised) |
| Process | Gear Tooth Surface Grinding |
| Module | 2 |
Overview
What Makes a Ground Helical Gear Different?
When a linear motion system demands reliable, low-noise power transfer, few components do the job as quietly or as precisely as a ground helical gear. Unlike spur gears that engage teeth along a single straight line simultaneously, helical gears engage progressively — tooth by tooth — across a diagonal contact path. The result is dramatically smoother load transfer, reduced vibration signature, and consistent torque delivery even at elevated speeds. Our Module 2 ground helical gear carries DIN6 Grade 5 certification, placing it firmly within the tier of precision components used in CNC machining centres, robotics articulation joints, and high-duty industrial conveyors throughout the United Kingdom.
The 19°31’42” helix angle is not arbitrary — it is the product of careful engineering to balance axial thrust load, bending strength, and the contact ratio that determines noise level. Each gear in this series completes its life with a dedicated tooth surface grinding process, a final operation that eliminates heat-treat distortions and brings every flank into tight dimensional compliance with DIN tolerances. This level of process discipline is what separates catalogue-quality gears from instruments-grade components. Whether your application calls for a Rectangular Guide Rail pairing or a complete rack-and-pinion drive system, these gears deliver the accuracy that keeps your machine running to spec.
Material & Manufacturing
Alloy Steel Built to Outlast the Machine
40Cr — Induction Hardened
Chromium alloy steel selected for its outstanding hardenability and toughness. After rough-cutting, teeth are induction hardened to HRC 48–52, creating a hard working surface over a tough, impact-absorbing core. Ideal for moderate-cycle applications where shock loads occur periodically — a design principle widely used in UK packaging machinery and conveyor drives.
20CrMnTi — Case Carburised
A case-hardening grade that combines a high-carbon surface (HRC 50–55) with a softer, ductile interior. The carburising treatment diffuses carbon deep into the tooth surface, producing exceptional wear resistance while preserving bending fatigue strength. This alloy is the standard choice for continuous-duty drives in servo-controlled systems and precision positioning tables throughout British automation plants.
Following heat treatment, every gear proceeds to the tooth surface grinding stage — the operation that gives these helical gears their DIN6 Grade 5 status. Dedicated CNC gear-grinding machines remove the distortion introduced during hardening, bring tooth profile and lead deviations within DIN tolerance, and reduce surface roughness to a level that measurably cuts running noise. No other finishing method achieves the same combination of geometric accuracy and surface quality without grinding.
Technical Specification
Complete Dimension Table — Module 2 Series
Unit / Dimension: mm | All specifications subject to change without prior notice. Please confirm with our technical team before ordering.
| Code | Module | Tooth No. | d1H6 | d2 | d3 | D | W1 | W2 | W3 | WJS9 | M |
|---|---|---|---|---|---|---|---|---|---|---|---|
| YMCL201438 | 2 | 21 | 14 | Φ30 | Φ44.56 | Φ48.56 | 20 | 38 | 16.3 | 5 | 6 |
| YMCL201936 | 2 | 25 | 19 | Φ35 | Φ53.05 | Φ57.05 | 21 | 36 | 21.8 | 6 | 6 |
| YMCL202034 | 2 | 21 | 20 | Φ36 | Φ44.56 | Φ48.56 | 20 | 34 | 22.8 | 6 | 5 |
| YMCL202058 | 2 | 25 | 20 | Φ45 | Φ53.29 | Φ57.29 | 25 | 58 | 22.8 | 6 | 6 |
| YMCL202054 | 2 | 27 | 20 | Φ40 | Φ57.29 | Φ61.29 | 25 | 54 | 22.8 | 6 | 6 |
| YMCL202242 | 2 | 20 | 22 | Φ35 | Φ42.44 | Φ46.44 | 24 | 42 | 24.8 | 6 | 6 |
| YMCL202250 | 2 | 25 | 22 | Φ40 | Φ53.29 | Φ57.29 | 25 | 50 | 24.8 | 6 | 6 |
| YMCL202243 | 2 | 30 | 22 | Φ50 | Φ63.66 | Φ67.66 | 28 | 43 | 24.8 | 6 | 6 |
| YMCL202250 | 2 | 30 | 22 | Φ50 | Φ63.66 | Φ67.66 | 28 | 50 | 24.8 | 6 | 6 |
| YMCL202555 | 2 | 30 | 25 | Φ45 | Φ63.66 | Φ67.66 | 25 | 55 | 27.8 | 8 | 6 |
| YMCL203255 | 2 | 32 | 32 | Φ50 | Φ67.9 | Φ71.9 | 24 | 55 | 35.3 | 10 | 8 |
| YMCL203258 | 2 | 36 | 32 | Φ50 | Φ76.39 | Φ80.39 | 24 | 58 | 35.3 | 10 | 8 |
Why Choose This Product
Six Performance Advantages Engineered In
DIN6 Grade 5 Accuracy
Ground tooth flanks meet tight DIN profile and lead tolerances — suited to servo-driven and CNC-controlled axes where positional repeatability is non-negotiable.
Low Noise Operation
Progressive tooth engagement, combined with gear-ground surface finish, dramatically lowers running noise compared to shaved or hobbed alternatives — a key requirement in UK food processing facilities.
High Surface Hardness
Induction or case-hardening brings the tooth surface to HRC 48–55, fighting abrasive wear and extending service intervals significantly in continuous-production environments.
Dual Material Options
The 40Cr/20CrMnTi choice lets engineers match material behaviour to duty cycle. One alloy optimises impact resistance; the other maximises through-case wear life for high-cycle applications.
Wide Size Range
Twelve standard bore and face-width combinations covering bore sizes from 14 mm to 32 mm accommodate a broad spectrum of British OEM and MRO applications without custom tooling costs.
Reliable UK Delivery
Stocked items dispatched promptly with full documentation. Our logistics team co-ordinates with UK customs to keep lead times predictable for maintenance shutdowns and new machine builds alike.
Application Scenarios
Where Ground Helical Gears Perform Best
These gears are specified across industries wherever smooth speed reduction, precise positioning, and long service life must coexist. In UK-based CNC machining centres, the ground helical gear is the standard pinion choice for rack-and-pinion gantry drives — its progressive tooth contact keeps axis positioning noise below the threshold that disrupts linear encoder feedback. Robotics integrators in the West Midlands regularly select this series for articulated arm joints because the higher contact ratio distributes bending stress across multiple teeth simultaneously, reducing peak root stress and allowing higher torque throughput in a compact envelope.
In the automated warehousing and logistics sector — a fast-growing market across the English Midlands and around major UK distribution hubs — helical pinions drive the belt-conveyor gearheads that move thousands of parcels per hour. The low vibration signature matters here: shock loads transmitted to the frame damage sensors and scanners. Scottish paper mills and Welsh printing facilities have standardised on helical drives in their web-tension control systems for similar reasons — smooth torque delivery means consistent tension across the roll width, which directly reduces scrap rates.
Servo Drive Systems
Robotic Joints
Industrial Conveyors
Printing & Packaging
Rack & Pinion Drives
Factory & Custom Capability
Built-to-Specification Helical Gears for UK Engineers
Our manufacturing facility operates dedicated CNC gear-hobbing lines, CNC gear-shaping stations, and multi-axis gear-grinding machines that together enable a genuine build-to-print service for UK buyers. Standard catalogue items leave stock within agreed lead times, but the real differentiator is the factory’s bespoke manufacturing capability: custom bore diameters, non-standard face widths, alternative helix hand (left-hand helix on request), modified tooth profiles for specific mesh conditions, and surface coating options including phosphate and black oxide treatments. Engineering drawings in DXF, STEP, or PDF are all accepted, and our in-house metrology lab provides full inspection reports against DIN tolerances — critical documentation when qualifying components for UK regulated industries such as medical device manufacture, defence sub-contracting, or food-grade processing machinery. Contact our UK-facing sales team to discuss your exact requirement, including volume pricing structures for batch production and consignment stocking arrangements.
Customer Success
What UK Buyers Are Saying
Real projects. Verified procurement outcomes.
Case Study — UK Aerospace Sub-Contractor, West Midlands
A precision machining company supplying aerospace jig components needed to replace noisy spur pinions in a 5-axis positioning gantry. Running noise was triggering false alarms on the onboard vibration monitoring system. After switching to YMCL202250 ground helical gears — selected for their 22 mm bore to match the existing servo motor shaft — measured gantry noise dropped by 8 dB(A) at full traverse speed. The procurement team ordered an initial batch of 60 pairs and placed a standing order for quarterly replenishment within four months, citing consistent dimensional quality and reliable shipping documentation.
“The DIN grade 5 certificate matched what our quality manual required without any waiver process. Lead time was three weeks to Birmingham — genuinely competitive.” — Procurement Manager, West Midlands Aerospace Supplier
★★★★★
“We quoted three suppliers for Module 2 ground helical gears. These came in at a competitive price and the inspection report was thorough. Running them in a conveyor head in our Scottish facility for eight months without issue.”
— Engineering Director, Food Processing Equipment, Scotland
★★★★★
“We had a tight build schedule for a robotic palletiser going into a Welsh distribution centre. Ordered YMCL202034 on a Tuesday, cleared UK customs by Friday. The gears dropped straight into our housing without re-boring. Saved us two days.”
— Design Engineer, Automation Integrator, South Wales
★★★★★
“Transitioning from a European supplier — price per piece was better, the DIN paperwork was equivalent, and the sales team actually answered technical questions about helix direction rather than pushing stock items. We’ll be buying the rack series next.”
— MRO Buyer, Printing Machinery OEM, East Midlands
FAQ
Frequently Asked Questions
What is the price for a DIN6 Grade 5 ground helical gear Module 2 supplier shipping to the United Kingdom?
Unit pricing depends on the model code, bore size, material (40Cr or 20CrMnTi), and order volume. UK buyers typically see the best per-piece cost at minimum order quantities of 20 pairs. Contact our sales team at sales@farm-equipment-parts.com with your model reference and annual volume estimate to receive a firm landed cost including UK import duty and shipping.
How do I get a quote for custom bore helical gears delivered to a UK address?
Send your drawing (PDF, DXF, or STEP) and required quantity to sales@farm-equipment-parts.com. Our applications team will confirm feasibility, select the appropriate material grade, and return a quotation typically within two working days. Custom items include a full DIN inspection certificate at no additional charge.
Which material should I choose — 40Cr or 20CrMnTi — for a high-cycle conveyor drive in a UK food factory?
For continuous-duty conveyor drives running more than 16 hours per day, 20CrMnTi with carburising and case hardening to HRC 50–55 is the more durable choice. The deeper hardened case resists abrasive wear better over a long service life. If the drive experiences occasional shock overloads — jam events, for example — the 40Cr induction-hardened variant’s tougher core may be preferable. Discuss your duty cycle with our technical team for a definitive recommendation.
Where can I find a reliable helical gear supplier for CNC automation equipment in the West Midlands or broader UK market?
Our ground helical gear series is available to UK buyers nationwide — including engineering clusters in the West Midlands, East Midlands, and South East — with online ordering and direct-to-site delivery. Full documentation for ISO 9001 audits is supplied as standard. Email our sales team for delivery timelines to your postcode.
What is the difference between DIN Grade 5 ground helical gears and standard hobbed gears for rack and pinion systems?
DIN Grade 5 ground gears achieve tighter profile and lead tolerances (typically within a few micrometres) compared to Grade 8–10 hobbed or shaved gears. In rack-and-pinion systems, this translates to lower backlash, higher positional accuracy, and quieter operation — critical factors in CNC gantry axes and servo-driven linear modules. Ground gears cost more but pay back through reduced positioning error and longer service life.
When should I consider a V-Type Ground Helical Guide Rack instead of a standard spur rack for a UK machine build?
A V-Type Ground Helical Guide Rack is the right choice when your axis demands smooth, continuous motion over long travel lengths with minimal noise and vibration — for instance, in linear modules, large-format CNC routers, or automated welding gantries. The helical tooth form distributes load progressively, reducing dynamic excitation at higher traverse speeds compared to spur rack equivalents. Pairing the helical rack with this Module 2 helical pinion series ensures full geometric compatibility.
Ready to Order?
Ground Helical Gears — UK Supply Available Now
Get a competitive price, DIN-certified inspection documentation, and direct delivery to any UK address. Standard and custom configurations both available.
sales@farm-equipment-parts.com
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