Aircraft Internal Gear – M0.15-M2.0, AGMA 13, Multi-Metal

Aircraft internal gears are precision ring gears whose teeth are generated on the inner bore of the gear blank — engineered for the demanding performance, reliability, and weight requirements of aircraft applications. Internal gears have their teeth generated on the I.D. of the blank and are generally more robust and more efficient than the mating pinion gear. In aircraft applications, the internal ring gear's superior load capacity per unit tooth face width (from the concave internal tooth surface's conforming contact), higher contact ratio (1.7–2.2 vs 1.4–1.6 for external pairs), and compact coaxial geometry make it the standard choice for aircraft actuator planetary stages, helicopter gearbox planetary reduction stages, and aircraft instrument precision drives.

Korea Ever-Power produces aircraft internal gears in module M0.15 to M2.0, diameter Φ3–Φ120 mm, in all major aircraft gear materials. AGMA 13 / DIN 5 accuracy standard. ISO 9001:2008 / TS16949 certified. ODM design service with a professional team of experienced engineers. Samples from Chinese factory or European agent storage. Quotation within 24 hours.

Flight Control Actuators (EMA)

Alloy steel or aluminium internal ring gears M0.8–M2.0 AGMA 13 in electromechanical actuators (EMA) driving ailerons, elevators, rudders, and spoilers. The planetary stage's compact coaxial form factor fits within the wing and fuselage skin envelope required for primary flight control actuation. AGMA 13 accuracy ensures the position servo loop's feedback accuracy at the actuator output shaft.

Helicopter Gearbox Planetary Stages

High-strength alloy steel (17CrNiMo5 or equivalent) internal ring gears M1.5–M2.0 in helicopter main gearbox planetary stages. Helicopter gearboxes are the most weight-critical gearboxes in any vehicle — the planetary stage's torque density advantage over external gear trains is decisive here. Ring gear weight is minimised by maximum tooth hardness (allowing minimum tooth face width for the required life) and optimised tooth proportions.

Aircraft Instrument Drives

Brass or aluminium aircraft internal ring gears M0.15–M0.5 AGMA 13 in altimeters, airspeed indicators, attitude indicators, and aircraft clock mechanisms. Fine pitch aircraft ring gears in brass achieve the AGMA 13 accuracy required for precision instrument drives at the minimum size that avoids the interference condition at low tooth counts. From European agent storage for rapid delivery.

Landing Gear Actuation

Alloy steel aircraft internal ring gears M1.0–M2.0 in electric landing gear retraction planetary drive stages. Landing gear actuators operate at low duty cycle (1–2 cycles per flight) but must deliver very high torque against the aerodynamic load during retraction at speed — the ring gear's torque density advantage over an external gear train of equivalent ratio is significant for landing gear actuator packaging within the wheel well.

UAV Propulsion and Tilt-Rotor Drives

Aluminium or PEEK aircraft internal ring gears M0.5–M1.5 in UAV electric motor planetary reduction drives and tilt-rotor conversion mechanism planetary stages. Weight is the primary constraint — aluminium ring gears at the same tooth face width as steel provide adequate life for UAV duty cycles at approximately 78% weight reduction. PEEK provides further weight reduction for the most weight-critical UAV applications.

Ground Support Equipment

Steel or alloy internal ring gears M1.5–M2.0 in aircraft tow tractor planetary drives, jet bridge positioning drives, and aircraft refuelling vehicle planetary gearboxes. Ground support equipment uses the same ring gear specification as industrial equipment at the equivalent power level, with the additional requirement of ISO 9001:2008 supplier certification for airport safety-critical equipment supply chains.

24-Hour Quotation

Korea Ever-Power quotes within 24 hours of receiving the enquiry. For urgent aircraft programme timelines, state the urgency at enquiry submission and the request will be prioritised. The 24-hour response covers material confirmation, lead time, quantity pricing, and any design questions raised by the drawing review. For complex multi-part aircraft gear assemblies, a preliminary response within 24 hours will indicate which details need clarification before the full quotation.

European Agent Storage for Fast Samples

For standard module and tooth count combinations in the aircraft internal gear range, Korea Ever-Power's European agent maintains a stock of samples available for immediate dispatch — eliminating the 3–5 day China production time for standard configurations. European aircraft programme engineers can receive a physical sample for incoming measurement within 2–3 days of enquiry. For non-standard configurations, production from China is 3–5 working days.

Professional Design Team

Korea Ever-Power's design team has rich experience in aircraft internal gear design and manufacturing. ODM service covers gear geometry design from aircraft system requirements (actuator torque, speed, ratio, OD envelope, material, accuracy grade, temperature range) through to production drawing and sample confirmation. The design team can also provide PDF, CorelDraw, or JPG drawings for components that need to be documented in the aircraft manufacturer's DDP (design definition package).

ISO 9001:2008 / TS16949 Quality System

Both certifications are maintained and available for customer quality audit verification. ISO 9001:2008 is the standard quality system certification accepted in most international aircraft supplier qualification processes. TS16949 (automotive quality management) provides an additional level of process rigour — the automotive standard's APQP, FMEA, and control plan requirements produce a production process that exceeds the minimum ISO 9001 requirement for aircraft internal gears in most applications.

When can I get a quotation for an aircraft internal gear?

Korea Ever-Power quotes within 24 hours of receiving the enquiry. If the quotation is urgent (programme deadline, customer RFQ response), state the urgency at submission and it will be treated as priority. For aircraft internal gears, the quotation covers: unit price at specified quantity, tooling cost if a new mould or fixture is required, sample lead time (3–5 days for production sample; faster from European agent for standard configurations), and production lead time for the quantity. Provide the module, tooth count, OD, bore, material, accuracy grade, and quantity for the fastest quotation.

How can I get a sample to check quality?

After price confirmation, samples can be requested to check quality before production commitment. For standard module and tooth count combinations, Korea Ever-Power's European agent storage holds samples available for direct dispatch — significantly faster than waiting for China production. For non-standard configurations, production samples are produced in 3–5 working days from China. Specify whether you need the sample from the Chinese factory or prefer European agent delivery at the sample request stage.

What drawing formats are accepted for aircraft internal gear orders?

Korea Ever-Power accepts PDF, CorelDraw, and high-resolution JPG drawing files. For 3D CAD files (common in aircraft design programmes), STEP and IGES formats are also accepted — confirm at the enquiry stage. For aircraft programmes where the design is in a format not listed (e.g. CATIA or NX native files), export to STEP or IGES format and submit. Korea Ever-Power's professional design team can interpret the exported file and produce a manufacturing drawing for approval before production.

Can Korea Ever-Power design the aircraft internal gear if we only have performance requirements?

Yes — Korea Ever-Power has a professional team with rich experience in aircraft internal gear design. If the aircraft programme has the actuator torque, speed, ratio, OD envelope, material preference, accuracy grade, and temperature range but not the finished gear design, Korea Ever-Power's design team will calculate the optimal module, tooth count combination, tooth proportions, and material specification, check all three interference conditions, and produce the manufacturing drawing for customer approval before production. The design service is included in the production order — no additional design fee for standard design work. Contact our team with the performance requirements to begin.

"We develop flight control EMA for regional aircraft and specified alloy steel aircraft internal ring gears M1.5 AGMA 13 from Korea Ever-Power. 24-hour quotation confirmed the material (17CrNiMo5) and AGMA 13 capability. Sample from Chinese factory in 4 working days. Gear measurement on our high-precision gear analyzer: all critical tolerances within AGMA 13 specification. TS16949 certification accepted at our aircraft supplier pre-qualification audit."

Kim Hyeon-jun  |  Aircraft Actuator Design Engineer, Incheon Aerospace Systems Co.  ·  Q1 2026

"We supply aircraft instrument mechanism drives and use brass aircraft internal ring gears M0.2 AGMA 13 from Korea Ever-Power — from their European agent storage. Dispatch 1 day, arrival 3 days after order. AGMA 13 confirmed on our optical comparator. The European agent stock eliminates the China production wait time for our instrument programme's development iteration cycles where we need multiple sample sets quickly."

Lee Sang-cheol  |  Aircraft Instrument Mechanism Engineer, Gyeonggi Avionics Systems Co.  ·  Q4 2025

"We design UAV propulsion planetary reduction units and specified aluminium aircraft internal ring gears M0.8 DIN 6 from Korea Ever-Power. ODM service used — we had the torque and OD constraint but no gear drawing. Design team proposed the tooth count combination, confirmed the interference condition check, and produced the drawing for approval. Sample gears: weight 18 g — versus 66 g for the equivalent alloy steel ring gear. Weight budget met."

Park Hyeon-uk  |  UAV Propulsion Engineer, Busan Unmanned Systems Co.  ·  Q2 2026

"We import aircraft internal gears for distribution to aerospace maintenance facilities. Korea Ever-Power's 24-hour quotation response covers the widest material and module range of any internal ring gear supplier we work with. The European agent stock for standard configurations means we can respond to urgent MRO (maintenance, repair, overhaul) orders within 3–4 days. ISO 9001:2008 and TS16949 documentation package provided per batch for our customers' maintenance records."

Choi Dong-hyeon  |  Aerospace Parts Import Manager, Daejeon Aviation Components Co.  ·  Q3 2025

"We specified stainless steel aircraft internal ring gears M1.0 DIN 5 for a helicopter door locking mechanism — non-magnetic and corrosion resistant required. Korea Ever-Power confirmed SS304 non-magnetic at Feritscope ≤ 1.3 FN per delivery batch. DIN 5 profile accuracy confirmed on our CNC gear measurement machine. 24-hour quotation; 5-day sample production from China — within our development programme's tight timeline."

Yoon Jae-sik  |  Helicopter Mechanism Engineer, Ulsan Rotorcraft Systems Co.  ·  Q1 2025