Metal Internal Gear – M0.15-M3.0, 11 Materials, AGMA 13

Metal internal gears are the broadest-range ring gear product Korea Ever-Power manufactures — covering module M0.15 through M3.0, diameter Φ3 to Φ120 mm, in 11 material options from POM through tool steel. The defining feature of this product family is the popular large-size metal internal gear: low cost, suitable for many applications, large in size and number of teeth, and capable of being used as segment gears by cutting. The ability to cut a full-circle metal internal ring gear into segments — arc sections of 60°, 90°, 120°, or custom angles — is particularly valuable for installations where a full-ring mounting is not possible due to shaft or housing interference, or where the ring gear is too large to ship as a single piece.

Korea Ever-Power is one of China's leading manufacturers of metal internal gears with over ten years of experience and hundreds of qualified personnel. 100% QC before shipping. Free samples available (1–2 days after specification confirmation; freight paid by customer). Factory visits welcome. Agent and distributor cooperation available. Quotation within 24 hours. ISO 9001:2008 / TS16949.

Installations Where Full-Ring Mounting Is Impossible

In some machinery retrofits or replacements, the ring gear's mounting location is not accessible for a full-ring installation — a bearing, shaft collar, or structural member blocks the insertion path. By cutting the ring gear into two or three segments, it can be installed around the obstruction and bolted together with precision alignment features. Korea Ever-Power's large metal internal ring gears are precision-cut at the segment boundaries with matched reference surfaces and dowel pin holes to ensure the assembled segments produce the same tooth accuracy as the original full-circle ring.

Ring Gears Too Large to Ship as Single Piece

Very large ring gears (above approximately 800 mm OD for sea freight; above 400 mm for air/express) may exceed the practical dimensional limits of international shipping containers or air freight pallets in their full-circle form. Cutting the ring gear into 3 or 4 segments reduces the maximum dimension from the full OD to approximately 60–70% of the OD, making the segments shippable in standard packaging. The segments are precision-marked and match-bored at the joint faces for assembly alignment at the installation site.

Partial Arc Engagement Applications

Some mechanism designs require only a partial arc of internal gear teeth — a sector ring gear that engages the pinion over a limited angular range corresponding to the mechanism's working stroke. For example, a windscreen wiper drive mechanism may use a 120° sector internal gear; an automotive seat recline mechanism may use a 90° sector ring gear. Korea Ever-Power cuts full-circle ring gears to the required sector arc angle, with precision end faces and any required mounting holes or brackets.

General Industrial Machinery

Carbon or alloy steel metal internal ring gears M1.5–M3.0 in industrial planetary gearboxes, conveyor system reducers, agitator drives, mixing machine planetary stages, and general factory automation planetary drives. The broad module range up to M3.0 covers the full industrial gear size spectrum from small servo planetary to large industrial reducers.

Military Equipment

Alloy or stainless steel metal internal ring gears M0.5–M2.0 in military vehicle turret traverse planetary drives, weapon system elevation actuators, and military robot joint planetary gearboxes. ISO 9001:2008 certification and TS16949 process rigour provide the quality documentation trail for military procurement compliance.

Medical Equipment

Stainless steel or aluminium metal internal ring gears M0.15–M1.0 in surgical robot joint planetary drives, rehabilitation device actuators, and medical imaging positioning systems. The M0.15 minimum module provides the fine-pitch precision required for medical instrument drives at the smallest ring gear diameters.

Large Segment Ring Gears

Carbon or ductile iron metal internal ring gears M2.0–M3.0 supplied as arc segments for large industrial equipment, slewing ring replacements, and machinery where the full ring cannot be installed in one piece. Matched reference surfaces and dowel pin holes ensure correct assembly alignment at the installation site.

Automotive Mechanisms

Multi-material metal internal ring gears M0.15–M2.2 for automotive seat, steering, braking, and comfort system drives. The 11-material option list covers POM plastic ring gears for low-noise comfort actuators through alloy steel for high-torque transmission stage ring gears — all from a single TS16949 certified supplier.

Wholesale and Distribution

Metal internal gears for industrial parts distributors and equipment OEM builders. Agent and distributor cooperation available — Korea Ever-Power is open to establishing distribution partnerships in key markets. Large promotion in the market. Contact Korea Ever-Power's overseas manager for distributor programme details.

Are free samples available for metal internal gears?

Yes — Korea Ever-Power provides free samples for metal internal gears. After the specification is confirmed (module, tooth count, OD, bore, material, surface treatment), the sample is produced in 1–2 days. The freight cost from China to the customer's address is paid by the customer. The free sample allows quality verification before production commitment. All samples are 100% QC inspected before shipping — the same standard as production parts.

What does 100% QC before shipping mean?

100% QC means every single gear in every batch is inspected — not a sample or AQL inspection. Korea Ever-Power tests every batch every day. The QC inspection covers dimensional accuracy (OD, bore, face width, tooth profile), hardness (confirmed by portable Rockwell tester), and visual inspection for cracks, nicks, or surface defects. Korea Ever-Power provides a 100% quality guarantee for customers — if any quality problem is identified after delivery, Korea Ever-Power takes full responsibility.

Can I visit the factory before placing an order?

Yes — factory visits are very welcome. Korea Ever-Power is happy to receive prospective customers for a factory tour covering the CNC gear shaping, turning, heat treatment, and quality inspection departments. Visiting the factory establishes a good relationship for business and allows direct verification of the production capability and quality management process. Contact Korea Ever-Power with your planned visit dates to arrange the factory tour schedule.

Can I become an agent or distributor for Korea Ever-Power metal internal gears?

Yes — Korea Ever-Power welcomes distributor and agent cooperation for metal internal gears in international markets. Korea Ever-Power currently has large promotion activity in the market. Distributors benefit from: competitive ex-factory pricing, ISO 9001:2008 and TS16949 certifications for customer qualification, 24-hour quotation response, and the full 11-material product range that suits multiple end-market sectors. Contact Korea Ever-Power's overseas manager with the target market, customer profile, and estimated annual volume to discuss the distributor programme and terms. Contact our team to start the discussion.

"We needed large metal internal ring gears M2.5 as segments — the installation site had a bearing flange blocking full-ring insertion. Korea Ever-Power cut the full-circle ring into three 120° segments with matched dowel pin bores at the joint faces. All three segments assembled to correct tooth position on our installation alignment check. 100% QC inspection report included. Free sample confirmed segment cut accuracy before we ordered the production batch."

Kim Hyeong-jun  |  Industrial Equipment Overhaul Engineer, Incheon Heavy Industry Co.  ·  Q1 2026

"We supply military vehicle turret traverse ring gears and selected Korea Ever-Power for the 17CrNiMo5 alloy steel metal internal ring gear M2.0. Factory visit completed — the CNC gear shaping capability for large-module internal gears was confirmed. 100% QC before shipping with hardness report. 24-hour quotation response on our first enquiry."

Lee Byeong-cheol  |  Military Drive Systems Procurement Engineer, Gyeonggi Defence Systems Co.  ·  Q4 2025

"We distribute metal internal gears across 6 material families to Korean industrial and automotive customers. Korea Ever-Power's 11-material capability and single ISO 9001:2008 / TS16949 qualification mean we can serve both the POM plastic ring gear (automotive comfort actuator) and the SAE1045 steel ring gear (industrial planetary) customer with one supplier approval. The agent cooperation programme discussed with their overseas manager is progressing."

Park Jae-hun  |  Industrial Parts Distribution Director, Busan Components Distribution Co.  ·  Q2 2026

"We manufacture medical rehabilitation robots and use aluminium metal internal ring gears M0.8 DIN 6 from Korea Ever-Power. Sample delivered in 2 days — our fastest-ever sample turnaround for a precision ring gear. 100% QC inspection report confirmed OD ±0.005 mm tolerance on all 3 samples. DHL delivery to Seoul: 3 days from shipping notice. Production order placed; no quality issues in 18 months."

Choi Min-jae  |  Rehabilitation Robot Mechanism Engineer, Daejeon Medical Robotics Co.  ·  Q3 2025

"We import brass metal internal ring gears M0.3 AGMA 13 for aircraft instrument mechanism drives. Sample from European agent storage arrived in 4 days without waiting for China production — the fastest validation path we could ask for. AGMA 13 confirmed at our optical gear measurement instrument. TS16949 accepted at our aircraft supplier qualification process. Repeat orders over two years, no non-conformances."

Yoon Sang-hoon  |  Aircraft Instrument Parts Import Manager, Ulsan Aerospace Components Co.  ·  Q1 2025