Industrial Alloy Steel Double Helical Gears – Custom OEM

Industrial alloy steel double helical gears bring the performance benefits of the herringbone tooth form — high contact ratio, minimal axial load on shaft bearings, increased load-carrying capacity, and stable operation — to custom-configured alloy steel drives across the full range of industrial power transmission applications. The round double helical blank form is standard; material grade is fully customisable per the customer's drawing or specification.

Korea Ever-Power accepts minimum order quantity of 1 piece — a single custom double helical gear can be ordered for prototype validation, maintenance replacement, or low-volume OEM programmes where stocking multiples is not practical. The factory has been a recognised manufacturer and supplier of double helical gears for over ten years, offering customised production at competitive pricing with wholesale service available for distributors and OEM buyers.

High Coincidence Degree

The total contact ratio of a double helical gear pair is the sum of the transverse contact ratio and the overlap contact ratio from both helical halves. This is typically 2–4× the contact ratio of an equivalent spur gear, meaning load is distributed across more tooth pairs simultaneously — reducing noise, vibration, and peak tooth stress.

Small Axial Load

When correctly assembled with center planes aligned, the axial thrust from the left and right helical halves cancel — the net axial load on the shaft bearings is zero (or very small, residual misalignment component only). This eliminates the need for thrust bearings and reduces housing stress at axial load contact points.

Increased Carrying Capacity

Load is shared across two tooth sets (effectively doubling the available face width for load sharing). At the same pitch diameter and centre distance as a single helical gear, a double helical gear can carry significantly more torque before reaching the tooth surface fatigue limit.

Stable Operation

The progressive tooth engagement of helical teeth, combined with the high contact ratio and zero-thrust operation, produces steady, low-vibration torque transmission even at high speed. Industrial alloy steel double helical gears running in well-lubricated enclosed gearboxes typically have lower operating noise than any other external gear configuration at the same power level.

MOQ of 1 — Maximum Flexibility

The minimum order quantity of 1 piece makes Korea Ever-Power's industrial alloy steel double helical gear service accessible to prototype programmes, single-unit maintenance replacements, and low-volume OEM products where ordering in quantity is not practical. Each single-piece order receives the same material and dimensional verification as a production batch.

Full Custom Material Selection

Any alloy steel grade can be specified — from standard 45# carbon steel through high-alloy grades like 40CrNiMoA and 18CrNiMo6. The material is specified by the customer's drawing, and Korea Ever-Power sources the material to the specified grade and provides a material certificate with each delivery.

Industrial Reduction Gearboxes

Custom-configured alloy steel double helical gears for industrial speed reducers in conveyors, mixers, extruders, and compressors. The combination of high contact ratio and zero axial thrust makes these gears the highest-performance option for enclosed industrial gearboxes.

Prototype and R&D Programmes

Single-piece (MOQ 1) custom alloy steel double helical gears for prototype gearboxes and engineering research programmes. No minimum quantity commitment means prototype gear sets can be ordered and evaluated before production tooling is committed.

Heavy Machinery Maintenance

Single-unit replacement gears for failed industrial alloy steel double helical gears in cranes, mining equipment, and heavy conveyors — where OEM spares are unavailable, discontinued, or priced prohibitively. MOQ 1 makes economical single-unit replacement possible without stocking multiples.

Marine and Offshore

Alloy steel herringbone gears for marine reduction gearboxes, deck machinery, and offshore lifting equipment where custom material specification, MOQ 1, and competitive pricing for single-vessel build quantities are all simultaneously required.

Custom OEM Products

Low-to-medium volume OEM production of industrial alloy steel double helical gears for specialised machine builders where quantities per programme are too low for in-house tooling justification but too high to source individually from standard stock.

Wholesale Distribution

Wholesale supply of customised industrial alloy steel double helical gears to distributors and gear traders who supply the maintenance and MRO market in Europe, Southeast Asia, North America, and the Middle East.

Can you send the relevant technical parameters for industrial alloy steel double helical gears?

Yes — contact Korea Ever-Power online or by email with the specific configuration you need. For standard industrial alloy steel double helical gear enquiries, provide the module, tooth count, helix angle, bore diameter, face width, material grade, and required accuracy grade. We will return the relevant technical parameters, manufacturing lead time, and price. For customers who have a drawing, send it directly — this is the fastest path to a complete technical and commercial response.

Can product parameters be modified based on our specific data?

Yes — most products can be modified based on customer data. Contact us and provide the parameters you need. The only constraints are the manufacturing machine capacities (maximum OD, maximum face width, maximum module per the machine limits) and the physical feasibility of the specific geometry. For modifications to standard configurations, provide the changed parameters and we will confirm feasibility and any impact on price and lead time before committing to production.

How are sample and express charges handled?

For express charges, payment can be made directly to our company account, or customers with express account history can arrange freight-collect. If customers need samples, the sample cost is charged first. Once the customer places a production order following sample confirmation, a part of the sample cost is returned to the customer's account. This policy ensures both sides are committed to the evaluation process.

What ideas or custom requirements can Korea Ever-Power help with?

Send us your ideas or requirements — even in conceptual form without a finished drawing. Our engineering team can help define the gear geometry from the application requirement, produce a drawing for your confirmation, and then manufacture to the confirmed drawing. This covers new gear designs, replacement gears for obsolete equipment, and modified versions of existing designs. If a customer has an idea but is unsure whether it is feasible, the fastest approach is to describe the requirement by email and we will assess feasibility and respond with a preliminary recommendation.

What are the payment terms for industrial alloy steel double helical gears?

Payment is by T/T (telegraphic transfer). For regular orders, the standard terms are 50% in advance and 50% against photos of the finished goods before delivery. The pre-shipment photos allow the customer to visually verify the completed gear before the balance is transferred — a practical quality assurance step that is particularly useful for new customers or unusual configurations. Contact our team with your drawing and required quantity for a quotation and confirmed payment schedule.

"We needed a single replacement 42CrMo double helical gear for a failed unit in a legacy industrial reducer — OEM discontinued. Korea Ever-Power accepted MOQ 1, produced from our measurement report of the failed gear, and sent pre-shipment photos before we paid the balance. Gear fitted correctly at first installation. The center plane alignment was confirmed within our assembly specification during installation."

Kim Dong-jun  |  Plant Maintenance Engineer, Incheon Industrial Machinery  ·  Q2 2026

"We are a gear distributor supplying the MRO market. Korea Ever-Power's industrial alloy steel double helical gears at MOQ 1 allow us to fulfil single-unit emergency replacement orders that we previously could not service. The 50/50 T/T payment with pre-shipment photos provides the verification our customers require before we release payment. We have placed over 20 single-unit orders across various alloy grades in the past 12 months."

Lee Min-cheol  |  Technical Sales Manager, Busan Gear Distribution Co.  ·  Q4 2025

"We ordered a prototype 40CrNiMoA double helical gear set for an R&D gearbox — 2 pieces total. Korea Ever-Power accepted the order at MOQ 1 per piece and helped us finalise the helix angle selection for our target contact ratio. The center plane alignment tolerance was specified on the drawing and confirmed in the dimensional inspection report."

Park Seong-ho  |  Drivetrain R&D Engineer, Gyeonggi Mechanical Research Institute  ·  Q1 2026

"We build specialist marine lifting equipment with low annual unit volumes — typically 3–5 gearboxes per year. The MOQ 1 policy from Korea Ever-Power means we can order gear sets per project without stocking excess. The sample cost refund on production order placement has been applied correctly on our first two production follow-on orders."

Choi Jun-seo  |  Marine Equipment Design Lead, Ulsan Marine Lifting Systems  ·  Q3 2025

"We needed an alloy steel double helical gear for a wholesale customer's obsolete conveyor gearbox — unusual module 7, custom helix angle. Korea Ever-Power confirmed they had the required pitch cutter and produced from our measurement drawing. Pre-shipment photo confirmed the gear matched the drawing dimensions. Delivered within the quoted lead time."

Yoon Byeong-su  |  Wholesale Procurement Lead, Daejeon Industrial Components Distribution  ·  Q2 2025