Customized Worm Gear Set – OEM, All Materials, No MOQ

A customised worm gear set is a worm and worm wheel pair produced to a customer's specific drawing, 3D CAD file, or sample — in any material, module, tooth count, ratio, bore configuration, and surface treatment required by the application. Korea Ever-Power's gear manufacturing facilities bring years of worm gear design expertise gained through hundreds of projects covering varied sizes of custom worm gears across automotive, agricultural, electronic, industrial, medical, defence, and off-highway applications. For customers without full drawings or CAD files, Korea Ever-Power's engineers can customise worm gear sets from samples, sketches, or dimensional descriptions.

The customised worm gear set combines the standard worm gear's advantages — large single-stage ratio (20:1 to 300:1+), compact right-angle layout, self-locking capability — with the ability to specify any material, geometry, and finish. No MOQ; prototype and sample production available. NDA signed before drawings are shared. Customer IP strictly protected.

Design Expertise

Korea Ever-Power's engineering team brings years of worm gear design experience across projects from miniature M0.5 instrument drives to large M12 industrial gearboxes. The team can design a worm gear set from performance requirements (ratio, input speed, output torque, centre distance) when full drawings are not available — producing the design, obtaining customer approval, and proceeding to prototype production without requiring the customer to provide a finished gear drawing. For customers who do have drawings, Korea Ever-Power can review for manufacturability and suggest improvements before production.

Diverse Material Supply

Being a manufacturer of OEM gears with a diverse material supply allows Korea Ever-Power to meet the most challenging customer material demands: GB steel grades C45, 40Cr, 20CrMo, 20CrMoTi, 17CrNiMo6, 20CrMnTi, 42CrMo; stainless steel SS304, SS316, SS316L; brass; tin bronze and aluminium bronze; cast iron; nylon; POM; PA66. The correct material selection for worm gear applications — particularly the worm wheel material relative to the worm material — is part of Korea Ever-Power's design review for every custom project.

Advanced Manufacturing Technologies

Gear blank turning → NC gear hobbing → gear milling and shaping → gear shaving → tooth grinding (thread and wheel) → heat treatment (carburising, nitriding, induction, salt bath) → surface treatment. Korea Ever-Power's manufacturing process covers the complete worm gear production chain in-house — from raw material to finished, inspected gear set. No subcontracting of critical processes means Korea Ever-Power maintains direct quality control at every stage of custom worm gear production.

Reliability and Customer Satisfaction

All custom worm gear sets are QC inspected with full inspection reports issued before delivery. Non-conformances are reworked or replaced at Korea Ever-Power's cost, with return transport also borne by Korea Ever-Power. Customer drawings are not released to any third party without written permission — NDA available before first drawing exchange. Sample cost is charged but refunded when proceeding to mass production. No MOQ — prototype quantities of 1–10 pieces accepted.

Module (m)

The module determines the scale of the gear teeth — larger module means larger, stronger teeth and higher torque capacity, but also a larger and heavier gear set. The module must be the same for the worm and worm wheel. For custom worm gear sets, the module is selected based on the required output torque and the available centre distance envelope.

Worm Thread Starts (Z1)

The number of worm thread starts determines the efficiency and self-locking characteristics. Single-start (Z1=1): lowest efficiency (40–60%), highest lead angle allows self-locking, highest achievable ratio. Multi-start (Z1=2, 3, 4): higher efficiency (70–90%), larger lead angle reduces or eliminates self-locking, lower ratio per wheel tooth count. The lead angle λ = arctan(Z1 × m / d1) is the key parameter connecting starts, module, and pitch diameter.

Worm Wheel Teeth (Z2) and Ratio

Transmission ratio i = Z2 / Z1. For 20:1 with Z1=1: Z2=20. For 20:1 with Z1=2: Z2=40. For 60:1 with Z1=1: Z2=60. The worm wheel tooth count is the ratio multiplier — larger tooth count gives higher ratio and a larger worm wheel pitch diameter. For custom sets, Z2 is selected to achieve the required ratio from the available module and centre distance.

Centre Distance (a)

Centre distance a = (d1 + d2) / 2, where d1 is the worm pitch diameter and d2 is the worm wheel pitch diameter. The centre distance is the critical spatial constraint in custom worm gear design — it must fit within the gearbox housing or drive unit envelope. Korea Ever-Power designs custom worm gear sets to fit within customer-specified centre distance constraints by adjusting module, thread starts, and tooth count.

Material Pair Selection

For custom worm gear sets, the worm is almost always harder than the worm wheel — typically hardened steel worm with bronze or brass worm wheel. This deliberate hardness differential ensures wear occurs on the worm wheel (replaceable) rather than the worm (the more expensive, integral-shaft component). Korea Ever-Power selects the material pair based on the sliding velocity, duty cycle, and lubrication method specified for the custom application.

Self-Locking Requirement

If the custom application requires self-locking, the lead angle must be designed below the friction angle (~6° for steel-on-bronze with good lubrication). Korea Ever-Power calculates the lead angle for every custom worm gear set and confirms whether it is self-locking or not — an important safety consideration for lifting, valve, and positioning applications where back-driving would cause a hazard.

Automotive

Custom worm gear sets for automotive power window drives, electric seat adjusters, electric mirror fold actuators, convertible roof drive units, and electronic power steering column adjusters. Automotive custom worm gears require high volume production consistency, tight dimensional tolerances, and material traceability for PPAP/IATF 16949 supplier qualification documentation.

Agricultural Machinery

Custom worm gear sets for precision seeding drive metering units, fertiliser spreader rate control drives, irrigation valve actuators, and harvester crop diversion drive units. Agricultural custom worm gears must withstand outdoor environments, temperature extremes, and dirt-contaminated lubricant conditions — requiring robust heat treatment and sealed bearing arrangements in the mating gearbox design.

Medical

Custom worm gear sets for medical bed adjustment drives, surgical robot joint drives, rehabilitation equipment actuators, and infusion pump rate-setting mechanisms. Medical custom worm gears require material biocompatibility certification, non-magnetic material confirmation, sterilisation method compatibility, and full production traceability for FDA/CE regulatory submissions.

Defence and Off-Highway

Custom worm gear sets for defence vehicle turret elevation drives, weapon station positioning drives, off-highway construction machine attachment drives, and heavy-duty work platform positioning actuators. These applications demand maximum material strength (17CrNiMo6 case-hardened alloy steel), military-standard surface treatment, and independent inspection with certification of conformance for defence procurement documentation.

Electronic and Industrial

Custom worm gear sets for industrial robot joint drives, automated assembly machine indexing drives, PCB handling conveyor drives, and semiconductor wafer handling equipment positioning mechanisms. Non-magnetic stainless steel, cleanroom-compatible surface treatments, and ultra-low-backlash designs are available for electronic and semiconductor industry custom worm gear applications.

Aircraft

Custom worm gear sets for aircraft seat adjustment drives, galley equipment drives, ground support equipment positioning actuators, and UAV gimbal drives. Aircraft custom worm gears require lightweight materials (aluminium alloy or titanium where strength-to-weight is critical), full material certification with chemical analysis and mechanical test reports, and first article inspection (FAI) reports for aerospace procurement documentation.

Can Korea Ever-Power produce custom worm gears if I don't have a drawing?

Yes — Korea Ever-Power's engineers can customise worm gear sets from samples (copy or reverse-engineer), dimensional sketches with key dimensions, or performance specifications (ratio, torque, speed, centre distance). If you provide a sample, Korea Ever-Power will measure the sample, produce a drawing for approval, and then manufacture to the approved drawing. If you provide a performance specification without a sample, the engineering team will produce a design proposal for approval before prototyping.

Is there a minimum order quantity for custom worm gear sets?

No — Korea Ever-Power does not set a minimum order quantity. Prototype quantities of 1–10 pieces are accepted. A sample cost is charged for the first prototype run; this sample cost is refunded when the order proceeds to mass production. The unit price improves with quantity, and Korea Ever-Power provides tiered pricing at your inquiry stage so you can plan your production quantities for optimal cost.

What happens if the custom worm gears received are not to specification?

All custom worm gear sets are QC inspected with a full inspection report issued before delivery. In the event of non-conformance, contact Korea Ever-Power immediately with photos of the issue. Non-conforming parts are reworked or replaced at Korea Ever-Power's cost — the return transport cost is also borne by Korea Ever-Power. The inspection report from before shipment is the basis for root cause analysis.

How do I start a custom worm gear set order?

Send an enquiry with your drawing (DWG/DXF/PDF/STEP/IGES) or sample description, together with required quantity and delivery target. If an NDA is required, Korea Ever-Power will countersign and return within 24 hours of receipt. For custom worm gear sets where a drawing is not available, describe the application (ratio, torque, speed, centre distance) and Korea Ever-Power's engineers will prepare a design proposal. Contact Korea Ever-Power to begin.

"We needed a custom worm gear set for a new electric seat adjuster — the packaging envelope required a non-standard centre distance of 18.5 mm with a 30:1 ratio. We had no drawing, only the envelope constraint and torque spec. Korea Ever-Power's engineering team proposed a 2-start M1.5 worm with a 60T worm wheel at 18.5 mm centre distance, produced a 3D model for approval in 4 days, and delivered prototypes in 18 days. Fit and function confirmed first time."

Kim Jae-seong  |  Automotive Seat Mechanism Engineer, Incheon Automotive Components Co.  ·  Q2 2026

"We manufacture medical rehabilitation equipment and sourced custom 20CrMnTi worm gear sets from Korea Ever-Power for our joint drive units. NDA signed before drawings were shared — Korea Ever-Power's standard NDA was clear and returned countersigned in 8 hours. Full material certification, chemical analysis, and mechanical test reports supplied with first production batch for our IEC 60601 regulatory file. Non-conformance on two wheels in 200-piece batch: Korea Ever-Power replaced all 200 at no charge and covered return freight."

Lee Hyeon-su  |  Medical Device Mechanical Engineer, Gyeonggi Medical Systems Co.  ·  Q1 2026

"We develop off-highway construction equipment attachments and needed a custom worm gear set for a hydraulic attachment tilt drive — 42CrMo worm, tin bronze worm wheel, 45:1 ratio, self-locking confirmed. No drawing available — sent a worn-out sample. Korea Ever-Power reverse-engineered the sample, confirmed the lead angle was self-locking at 4.8° lead angle, produced a drawing for our approval, and delivered production parts in 22 days. Zero back-drive at full hydraulic pressure confirmed on test rig."

Park Dong-hyeon  |  Off-Highway Equipment Engineer, Daejeon Heavy Equipment Co.  ·  Q3 2025