Alloy Steel Worm and Worm Gear for Auto Parts | Ø5-Ø120 Module 0.2-2.2

Automotive Alloy Steel Worm Gear — Product Snapshot

The automotive alloy steel worm and worm wheel family from Ever-Power is built around the tight dimensional discipline modern vehicle OEMs demand from every moving component. Outer diameter spans Ø5 mm through Ø120 mm, covering the full size envelope from millimetre-scale wiper-motor worm shafts all the way up to 120 mm worm wheels used in electric parking-brake actuators and seat-recline modules. Module range runs from M0.2 to M2.2, with tolerance bands as tight as 0.001 mm on critical dimensions, and a catalogue of seven standard materials that can be mixed to match any tier-1 platform specification.

Korean automotive tier-1 suppliers in Ulsan, Asan, Gwangju and Hwaseong specify this worm gear family because it lines up with the Hyundai, Kia, Renault Korea and GM Korea manufacturing calendars. The same catalogue also feeds Japanese OEM programmes through our Osaka sales office — the geometry tolerances meet JIS B 1702 without reinterpretation. Each piece is produced under an IATF 16949-aligned quality system (formal certification available on request) and ships with PPAP-style documentation on any tier-1 programme.

Technical Specifications

The specification table below lists the dimensional envelope and processing options our QC desk verifies on every automotive batch. Any parameter outside this envelope triggers an engineering review before the purchase order is accepted — this step has kept our warranty return rate on automotive worm gears below 0.08 % over the past three years.

Product Strengths for Automotive Use

Five engineering properties make this alloy steel worm and worm gear family fit directly into the tight operating envelope of modern vehicle actuator systems. Each point is backed by measured field data from Korean and Japanese customer programmes.

• ⬟High-precision finish machining. CNC turning and hobbing lines cut tooth profiles to within 3 µm of nominal, verified on every sample batch by CMM and Gleason tester.
• ⬟Cross-industry fit. The same dimensional envelope suits automotive, military, medical, industrial, mechanical and aircraft devices — which lets a single OEM standardise its gearing across several products.
• ⬟Cost-effective engineering design. Alloy steel blanks are sourced through long-term framework contracts, keeping raw-material cost roughly 20 % below spot-market pricing.
• ⬟ODM and OEM service lines. Separate engineering teams handle own-brand and customer-brand programmes, so sensitive tier-1 drawings stay segregated from internal designs.
• ⬟Diversified short lead times. Production is split across four parallel lines so that a single machine breakdown does not stop deliveries to tier-1 customers — critical for Korean OEMs running just-in-time inventory.
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Alloy Steel Grades and Heat Treatment for Automotive Duty

Four alloy-steel grades cover almost every automotive worm gear application we ship. The choice depends on the combination of peak torque, reversing frequency, and target service life in the downstream vehicle actuator.

The 0.001 mm dimensional tolerance on finished parts is preserved through the heat-treatment stage by a two-step hob-grind process: gears are rough-hobbed oversize, heat-treated to hit the hardness target, then ground on a Reishauer NZA profile grinder to bring the tooth flank back into drawing tolerance. This approach gives an automotive-grade tooth finish below Ra 0.4 µm on every piece.

Automotive Application Map

The alloy steel worm gear family covers multiple actuator positions across a modern vehicle. The map below shows typical parameter sets for the most common applications in Korean and Japanese OEM platforms.

Benchmarking Against NSK and JTEKT

NSK and JTEKT are registered brand names belonging to their respective owners — both are leading tier-1 automotive component suppliers with deep legacy positions at Korean and Japanese OEM plants. Ever-Power does not represent or counterfeit their products. This benchmarking section is provided to help tier-1 buyers weigh their sourcing options on alloy-steel worm and worm gear components specifically. We manufacture our own equivalent-class components.

The benchmarking compares alloy-steel worm gear supply only — NSK and JTEKT each have far broader catalogues covering bearings, steering systems and complete drives. Numbers come from publicly available datasheets and from sales experience supplying Korean tier-1 customers who previously sourced from one of these brands.

Honest assessment: when the tier-1 customer is delivering a first-time supply into a new Hyundai-Kia or Toyota platform and PPAP documentation is contractually required from day one, NSK and JTEKT have the institutional track record. For retrofits, aftermarket programmes, and early-stage prototypes where the specification is still evolving, Ever-Power's two-piece MOQ and 7-day sample lead time change the development economics by roughly a factor of three.

Our Service Commitment to Automotive Tier-1 Customers

Korea Ever-Power Worm Gear Co., Ltd. offers a contractual service commitment that is specifically tailored to tier-1 automotive supply requirements. The commitments below form the baseline of every framework agreement we sign with Korean vehicle-component makers.

• ★Ten years of automotive experience. Hundreds of qualified personnel, production lines dedicated to alloy-steel worm gear components for auto-parts customers.
• ★24-month field warranty. Defects confirmed in the field are replaced free of charge, with Ever-Power paying return freight for verified claims.
• ★Drawing safety guaranteed. Customer drawings and 3D CAD files are protected by signed NDA and never shared with third parties.
• ★Technical proposal and quotation in one response. Customer sends drawing or sample, Ever-Power returns technical proposal plus quote — Korean-language response within 24 hours.
• ★Reverse engineering when no drawing exists. Send the sample to our Seoul office, we measure on CMM and produce a complete CAD drawing in 2 working days.
• ★Quality documentation on demand. PPAP, FAIR, 8D reports, CMM dimensional reports and material certificates — all supplied on request without premium charge.
• ★Express freight for urgent production. DHL, TNT, FedEx or UPS air freight to Incheon / Busan within 2 – 3 days for line-down emergencies.
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Related Worm Gear Components and Complete Drives

Automotive tier-1 customers rarely buy the worm gear as a standalone component — most orders ship as part of a larger sub-assembly. When the programme needs a complete sealed drive rather than loose gears, a packaged worm gear reducer built around the same alloy-steel components arrives pre-assembled and pre-tested, ready to mount on the vehicle platform.

For actuators that integrate a motor directly on the worm shaft, the flanged worm gearbox family includes NEMA 17 through NEMA 42 motor flanges as standard. The full catalogue of worm gear sets covers the complete dimensional envelope we currently tool, with matched worm shaft and worm wheel pairs for every standard module.

Frequently Asked Questions

Q: Are you a factory or a trading company?

Ever-Power is a factory-plus-trading hybrid. Manufacturing happens in our own facility with our own equipment and personnel; export sales go through our Korean and Japanese trade offices. This structure gives customers direct production control at factory pricing while still benefiting from local-language after-sales support.

Q: How do I get a quotation for an automotive worm gear?

Send a technical drawing or a detailed PDF with dimensions, tolerances, material, and required quantity. If any design requirement is unclear, our engineering team will return professional suggestions for your review before quoting. Korean-language quotations are prepared by the Seoul office within one working day.

Q: How long will it take to receive a sample?

Sample lead time depends on geometry and material, but typically runs 7 – 10 days from signed sample agreement. Complex custom geometries with special heat treatment can extend to 14 days. Express air freight to Incheon or Busan adds 2 – 3 days.

Q: How do I access the OEM service line?

Standard workflow: customer provides design drawings or original samples; Ever-Power returns technical proposals and a quotation; on customer agreement, production begins. The OEM service line is physically segregated from the catalogue production floor, which keeps tier-1 customer IP protected from exposure to third-party buyers.

Q: Will my drawings be safe after sending them to you?

Yes. Customer drawings are held under confidentiality procedures and never shared with third parties without written permission. A formal NDA is signed before any drawing transfer. The drawing archive is held on a segregated server with restricted access for the OEM engineering team only.

Q: What if we do not have drawings for the automotive worm gear we need?

Send the sample to our factory. Our engineering team can copy the geometry exactly or suggest improved variants. Sketches or photographs with dimensions (length, height, width) are enough to begin — a full CAD file and 3D model are produced once the production order is placed.

Q: How do I start an order?

Send an enquiry through the website form, email our Seoul office directly, or phone during Korean business hours. Korean, Japanese and English are all supported. Enquiries received outside business hours are answered on the next working day.

Q: Is PPAP documentation available for tier-1 programme release?

Yes. Full PPAP Level 3 package is supported at no premium charge for tier-1 automotive customers. Lead time for the first shipment extends by 5 – 7 working days to compile the documentation. For Level 4 or Level 5 packages, contact our Seoul office to discuss the specific format requirements.

Customer Voices from the Automotive Belt

Kim Tae-yong, Tier-1 Steering Module Supplier, Hwaseong (late 2025)
"We qualified Ever-Power's 20CrMnTi worm gear for a Hyundai EPS programme eighteen months ago. Field failures over 12 months sit at under 0.03 %, which beats our previous Japanese source. The Seoul engineering desk answered a tooth-profile question in Korean inside four hours — small detail but it keeps our engineering cycle moving."

Jo Min-ji, Seat Actuator Program Manager, Ulsan (mid 2025)
"Sourced a custom M0.8 worm gear set for a seat-recline motor on a Kia platform. NDA was signed same day the drawing arrived, sample appeared in 9 days, and the first 500-piece production batch passed incoming QC with no deviations. Cost came in roughly 45 % below our incumbent supplier. No surprises on any shipment since."

Yang Eun-bi, Wiper Motor Design Engineer, Asan (early 2025)
"Ordered a 40Cr worm shaft for a rear-window wiper drive that lives in the wet. Corrosion was the main concern, so we specified a zinc plating on the journal. First 100-piece batch delivered exactly on schedule with the correct plating. Warranty returns from field after nine months are zero, which is unusually clean for this kind of application."

Aoi Takahashi, Electric Parking Brake Engineer, Toyota City (late 2025)
"Prototyped an EPB actuator using Ever-Power's M2.0 bronze-on-steel worm gear. Needed 8 pieces for the bench-test rig. Most tier-1 suppliers refused small quantities; Ever-Power machined them in 14 days, charged a reasonable NRE, and delivered a clean CMM report. The pair has since been selected for mass-production tooling."

Lee Soo-hyun, Aftermarket Parts Distributor, Busan (early 2026)
"Stocking replacement worm gears for side-mirror folding modules across 14 Korean vehicle models. Ever-Power's POM-on-POM M0.3 set works as a drop-in for most of them. 8-week stock rotation, zero warranty claims over the last 22 months. Their ability to hold the exact dimensions batch after batch is the reason aftermarket customers keep coming back."

Pham Van Duc, Motorcycle Component Manufacturer, Ho Chi Minh City (mid 2025)
"Custom M1.2 alloy-steel worm gear for a scooter rear-brake drive. Monthly shipments of 2 000 pieces for past eight months, quality consistently matches drawing tolerance within ±3 µm. Lead time discipline is excellent — never missed a containerisation date. Korean-speaking engineer has helped with two small design iterations without charging extra for the engineering time."