Carbon Steel Double Helical Gear – 45#, Custom OD & Module

Carbon steel double helical gears — also called herringbone gears — combine two helical tooth sets in opposite hands on a common gear blank, cancelling the axial thrust forces that single helical gears impose on bearings and housings. The double helical form delivers high contact ratio, small axial load, increased load-carrying capacity, and stable operation, making it the preferred choice for power-dense drives where bearing arrangement space is constrained and vibration must be minimised.

Korea Ever-Power produces these gears primarily in SS304 stainless steel as the standard material, with carbon steel, alloy steel, and other material grades available to customer specification. SS304 suits applications in food processing, chemical handling, and humid or washdown environments where carbon steel corrosion would require surface treatment. The stainless double helical gear delivers the load-carrying benefits of the herringbone form without the corrosion maintenance burden of a carbon steel part in a demanding environment.

Custom Production Service

1. Produce to customer samples or drawings in any specified material.
2. Compatible drawing formats: PRO/E, AutoCAD, SolidWorks, UG, and others.
3. Free samples available for simple, low-value configurations.
4. Third-party inspection available on request.

Inspection and Documentation

1. Official inspection reports submitted with samples: material, mechanical property, and dimensional reports.
2. Third-party inspection report from recognised inspection body available.
3. QC process inspection performed before shipment on every order.

Warranty and After-Sales

1. 24-month warranty before shipment — products strictly inspected under factory QC system.
2. For any non-conformance: customer complaint procedure activated immediately upon notification.
3. Resolution and compensation scheme implemented within 48 hours.

Logistics and Storage

1. Storage service available for customers requiring buffer stock management.
2. Some standard items available from stock for short delivery times.
3. Custom items: 2–5 weeks from advance payment receipt.

Cranes and Fluid Pumps

Double helical gears in crane hoisting drives and fluid pump gearboxes for quieter and less vibration-intensive operation. The herringbone form eliminates axial thrust in pump drives where axial shaft loading would cause seal problems.

Naval and Marine Propulsion

Power transmission to propulsion screws in naval vessels and military ships — an application where quieter operation and low vibration directly affect stealth and crew comfort. SS304 or higher-grade stainless eliminates corrosion in the marine environment.

Food Processing Equipment

SS304 double helical gears in food processing drives — mixers, conveyors, and packaging machinery — where corrosion resistance in washdown environments is required and where the absence of surface coating eliminates coating-contamination risk.

Mechanical and Electrical Equipment

General mechanical equipment, electrical equipment, and automobile production drives where the double helical form provides the high contact ratio and stable operation required and where custom material grade selection optimises cost and performance for the specific duty.

Sports and Specialised Equipment

Sports equipment drives and specialist machinery requiring light weight (aluminium option), corrosion resistance (stainless option), or non-magnetic properties (SS304) alongside the vibration and noise advantages of the herringbone tooth form.

Export OEM Programmes

OEM production for export to Europe, Southeast Asia, North America, the Middle East, and East Asia. ISO 9001 and RoHS compliance documentation, third-party inspection, and the 24-month warranty programme meet the incoming quality requirements of international OEM customers in these markets.

What product requirements beyond those listed on the website can Korea Ever-Power supply?

Send us your requirements and we will assess whether we can produce them. If we cannot produce the item directly, we can act as your China sourcing agent and identify the appropriate manufacturer. This sourcing agent service covers non-gear precision parts in the same materials and general size range as our production capability — aluminium, iron, stainless steel, copper, and plastic components in the mechanical and hardware category.

Are items available from stock?

Yes — some standard configurations are available from stock with shorter delivery times than the 2–5 week custom production lead time. Contact us with the specific configuration (material, module, tooth count, OD, bore) and we will confirm stock availability immediately. For custom configurations not in stock, production begins upon receipt of advance payment and the confirmed drawing.

How does the warranty work if a product is found to be abnormal after receipt?

The warranty period is 24 months from before shipment — products are strictly inspected under our factory QC system before dispatch. If an abnormality is found after receipt, contact us immediately. The customer complaint handling procedure activates at once: we will negotiate with the customer to find a reasonable resolution and compensation, with the implementation scheme delivered within 48 hours. Third-party inspection at the production stage is available to provide an independent verification of the QC process for customers who need this assurance before shipment.

How quickly can a quotation be provided for a custom gear?

Standard products listed on the website can be quoted within 24 hours. For customised configurations, the quotation is provided within 48 hours of receiving the complete drawing and specification — this time is needed to calculate cost based on the actual material, machining time, and tooling requirements. To receive the fastest quotation, provide the complete drawing with all dimensions, material grade, surface finish, and accuracy grade clearly specified at the enquiry stage.

Can Korea Ever-Power provide a storage service for a continuing supply programme?

Yes — Korea Ever-Power offers storage service for customers who require buffer stock held in China against a call-off schedule. This service is particularly useful for OEM programmes with variable call-off volumes where holding safety stock in the customer's own facility is impractical. The stored gears are inspected and documented before storage and re-inspected before each shipment release. Contact our team with your annual volume and call-off pattern to discuss storage service arrangements.

"We manufacture food processing equipment and need SS304 double helical gears that can be cleaned in place with caustic wash cycles. Korea Ever-Power's SS304 herringbone gears have operated in our filling line for two years without any corrosion or dimensional change. The quotation was received within 24 hours; the dimensional report came with the delivery and confirmed all tolerances."

Kim Mi-rae  |  Equipment Engineer, Incheon Food Processing Systems  ·  Q1 2026

"We supply fluid pump gearboxes to the chemical processing industry and switched from single helical to SS304 double helical gears from Korea Ever-Power. Seal leak rate at the pump shaft dropped after eliminating gear axial thrust from the shaft bearing load. The 48-hour resolution commitment was tested when we received a gear with a dimensional non-conformance — the replacement was shipped within the warranty response window."

Lee Byeong-kook  |  Pump Gearbox Design Engineer, Ulsan Chemical Equipment Co.  ·  Q4 2025

"We needed SS304 herringbone gears for a naval vessel auxiliary drive — non-magnetic and corrosion resistant specification. Korea Ever-Power confirmed SS304 meets the non-magnetic requirement (austenitic, not work-hardened) and produced with a third-party inspection report from an accredited laboratory. The storage service allowed us to hold 6 months' safety stock in China for our ongoing maintenance programme."

Park Cheol-hwan  |  Marine Systems Procurement, Busan Naval Systems  ·  Q2 2026

"We import SS304 double helical gears for resale to European automation customers. The ISO 9001 and RoHS certificates provided with the first order were accepted without supplemental documentation at the European border. Korea Ever-Power quoted within 48 hours for our custom configuration and delivered 3.5 weeks after advance payment — within their stated lead time."

Choi Seon-young  |  International Procurement Manager, Seoul Industrial Components Trading  ·  Q3 2025

"We manufacture sports exercise equipment with precision herringbone gears in the resistance drive. Korea Ever-Power provided free prototype samples for our initial design evaluation — the prototypes matched the drawing dimensions and the gear mesh ran quietly in our test rig. We have since placed production orders for three annual batches with storage service between batches."

Ryu Hyeon-su  |  Product Development Engineer, Daejeon Sports Equipment Manufacturing  ·  Q1 2025