Aircraft Double Helical Gear – M0.15-M2.0, Multi-Material

The double helical gear form in aircraft applications is the engineering choice when a single helical gear's axial thrust force would create an unacceptable load on the bearing arrangement of a compact aircraft mechanism. The helical gear has a transverse force on the shaft. To eliminate this force, the gear is made into a double helical gear — two helical tooth sets of symmetrically opposite direction on a common blank — stopping the net axial force. Viewed from above, the tooth grooves form the letter V; in quantity they produce the herringbone pattern. Korea Ever-Power's aircraft double helical gears deliver high coincidence degree, small axial load, high bearing capacity, and stable operation — and adopt the double-helical form to transmit torque from the drive motor to the load shaft in the same way as industrial herringbone gears, but optimised for the lightweight, compact, and precision requirements of aircraft mechanisms.

Standard example: Φ8 mm, module M0.15–M2.0, in any of the available materials including bronze, titanium alloy, aluminium, or stainless steel. Highly precise aircraft double helical gears are produced to AGMA 13 / DIN 5 accuracy — the highest practical accuracy in the small-module, small-diameter range. ODM and OEM service. ISO 9001:2008 / RoHS certified. 24-month warranty.

High Coincidence, High Bearing Capacity

The double helical form provides the highest contact ratio among external gear types. In aircraft mechanism drives where the weight and size of the gearbox must be minimised, the high bearing capacity of herringbone gears allows the same torque to be transmitted in a smaller and lighter gear package than spur gears of equal centre distance.

Zero Axial Load

Elimination of axial load means the shaft bearings of aircraft mechanism gear trains need only accommodate radial loads. In a UAV payload actuator or flight control surface drive where the shaft support is a miniature bearing, this thrust elimination directly reduces bearing size and thus mechanism weight — an explicit advantage in the weight-sensitive aircraft application.

Stable, Quiet Operation

Aircraft interior environments are noise-sensitive for passenger comfort; electronic rack environments require low vibration to avoid interference with precision instrument readings. The herringbone gear's smooth, continuous tooth engagement and high contact ratio produce the lowest gear-generated noise and vibration among external gear configurations — without the weight penalty of vibration-damping coatings or housings.

AGMA 13 Precision

AGMA 13 (≈ DIN 5) is the highest accuracy achievable in the M0.15–M2.0 size range for machined metal gears. At this accuracy level, transmission error at the tooth mesh frequency is minimised — the gear pair delivers the closest approach to constant velocity ratio that is practically achievable in a manufactured gear set, which is the required property for precision aircraft actuator drives.

Aircraft Auxiliary Mechanism Drives

Seat adjustment drives, window shade actuators, overhead bin mechanisms, and galley equipment drives in commercial aircraft. Aluminium or POM herringbone gears at AGMA 12–13 for weight reduction and quiet cabin operation.

Helicopter Accessory Drives

Hydraulic pump drives, generator drives, and avionics cooling fan drives in helicopter engine bays. Alloy steel or stainless herringbone gears at AGMA 13 for vibration resistance and long service life between maintenance intervals.

UAV Payload Actuators

Camera gimbal drives, sensor pointing mechanisms, and payload release actuators in unmanned aerial vehicles. Aluminium double helical gears at AGMA 13 minimise actuator mass while meeting the precision requirement of UAV payload positioning systems.

Military Avionics

Precision instrument drives in military aircraft avionics bays — radar antenna positioning, targeting system drives, and EW antenna actuators where AGMA 13 accuracy, non-magnetic material, and vibration-stable operation are simultaneously required.

Satellite and Space Mechanisms

Solar array deployment drives, antenna pointing mechanisms, and docking mechanism gear trains in satellites and spacecraft. Custom alloy herringbone gears meeting space qualification material requirements for outgassing, thermal cycling, and radiation resistance.

Aircraft Fuel System Drives

Fuel boost pump gear trains and fuel control valve actuators in commercial and military aircraft fuel systems. Bronze herringbone gears for non-sparking operation in fuel-wetted environments; stainless for systems where corrosion resistance in fuel condensate is the primary requirement.

Can Korea Ever-Power supply products not currently listed on the website?

Yes — send the requirements and Korea Ever-Power will assess whether production is feasible. If production is not possible directly, Korea Ever-Power can act as a China sourcing agent to identify the appropriate manufacturer. This applies to aircraft mechanism gears in materials, sizes, or configurations outside the standard range, as well as to other precision mechanical components required alongside the gear set.

What certifications does Korea Ever-Power hold for aircraft gear supply?

Korea Ever-Power holds ISO 9001:2008 and RoHS compliance certification. For aircraft component supply programmes requiring AS9100 or NADCAP certification, these are not currently held — customers whose programme requires AS9100 should confirm requirements at the enquiry stage so that the available documentation and quality assurance provision can be assessed against the programme requirement. ISO 9001:2008 certified production with 100% pre-shipment inspection and 24-month warranty is the standard quality assurance provision.

What is the warranty and warranty response process?

The warranty period is 24 months before shipment — products are strictly inspected under the factory QC process system before dispatch. If any abnormality is found after receipt, the customer should contact Korea Ever-Power immediately. The customer complaint handling procedure activates at once: a reasonable resolution and compensation scheme is negotiated and the implementation is confirmed within 48 hours. This warranty applies equally to prototype and production quantities.

How is the product packed for air and express shipment?

Standard packing is one piece per carry bag, suitable quantity per export carton, without additional packing accessories. Vacuum-packed in plastic tray packaging is also available — recommended for aluminium gears (to prevent surface oxidation during extended transit) and for any gear where moisture absorption or surface contamination during shipping must be prevented. Customer-specified packing is available and should be stated at the order stage. Shipment is by air, sea, or DHL/UPS express per the customer's requirement.

Why should I choose Korea Ever-Power for aircraft double helical gears?

Korea Ever-Power takes customers' requirements as the mission and carefully addresses each specification. The 11-material option range (metal, bronze, steel, alloy, POM, zinc, aluminium, iron, stainless, brass, copper) in the M0.15–M2.0 size range at AGMA 13 accuracy gives aircraft component buyers access to a wider material and accuracy combination than is available from most specialist small-gear suppliers. The 5–7 day sample lead time supports fast development programmes; the 24-month warranty and 48-hour non-conformance response support series supply. Contact our team with your drawing or specification.

"We design UAV camera gimbal drives and needed Φ8 mm aluminium double helical gears at AGMA 13 in M0.5 module. Korea Ever-Power produced samples within 6 days. AGMA 13 accuracy confirmed on our CMM. Gear mass was within 5% of our SolidWorks estimate. The 24-month warranty and ISO 9001:2008 certificate met our drone component supplier qualification minimum requirements."

Kim Chan-woo  |  UAV Payload Mechanism Designer, Incheon Unmanned Systems  ·  Q1 2026

"We supply aircraft galley equipment and specified bronze aircraft double helical gears for a fuel-adjacent hot beverage system drive. Non-sparking property of bronze was the primary specification driver. Korea Ever-Power confirmed the bronze grade, produced in 28 days, and delivered by DHL within the production schedule. Vacuum tray packing prevented surface tarnishing during the 5-day express transit."

Lee Jae-wook  |  Galley Equipment Engineer, Seoul Aircraft Interior Systems  ·  Q4 2025

"We produce military avionics radar antenna positioning drives and required SS304 herringbone gears at AGMA 13 — non-magnetic, precision, and corrosion resistant. Korea Ever-Power produced samples in 7 days; production delivery in 27 days. Feritscope measurement at our incoming inspection confirmed non-magnetic (Ferite ≤ 2 Ferite number). Warranty response to a documentation query was received within 12 hours."

Park Jae-hyun  |  Avionics Mechanism Engineer, Gyeonggi Defence Electronics  ·  Q2 2026

"We import aircraft double helical gears in multiple materials for aerospace distributor customers. Korea Ever-Power's 11-material option range means a single supplier covers all our standard aircraft mechanism material requirements — aluminium, SS, alloy, and bronze — at AGMA 13 across the M0.15–M2.0 range. Lead time consistency across materials has been within the quoted 25–30 days on all orders over 18 months."

Choi Sang-jun  |  Aerospace Component Import Manager, Busan Aerospace Components Trading  ·  Q3 2025

"We develop helicopter hydraulic pump drives and had a POM double helical gear in our bill of materials that a previous supplier could not produce in the M0.8 module. Korea Ever-Power confirmed POM at M0.8 AGMA 12 was feasible, produced samples within the 5–7 day target, and the sample dimensions matched our CMM check. The non-magnetic and self-lubricating properties of POM suited the sealed pump drive design."

Yoon Tae-woo  |  Rotorcraft Hydraulics Engineer, Daejeon Helicopter Systems  ·  Q1 2025