{"id":1513,"date":"2026-07-14T05:54:01","date_gmt":"2026-07-14T05:54:01","guid":{"rendered":"https:\/\/gearrack.top\/product\/industrial-double-helical-gears-alloy-steel-od-to-1370mm\/"},"modified":"2026-07-14T05:54:28","modified_gmt":"2026-07-14T05:54:28","slug":"industrial-double-helical-gears-alloy-steel-od-to-1370mm","status":"publish","type":"product","link":"https:\/\/gearrack.top\/ja\/product\/industrial-double-helical-gears-alloy-steel-od-to-1370mm\/","title":{"rendered":"Industrial Double Helical Gears – Alloy Steel, OD to 1370mm"},"content":{"rendered":"
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<\/p>\n

Product Overview<\/h2>\n
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\n \"Industrial\n <\/div>\n
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Industrial double helical gears<\/strong> \u2014 the herringbone gear form \u2014 are among the most demanding products in gear manufacturing. Two helical tooth sets of opposite hand cut side by side on a common blank produce a gear that transmits high power with smooth, low-vibration tooth engagement, zero net axial thrust on the shaft bearings, and greater load-sharing capacity per unit of centre distance than any other external parallel-shaft gear type. These properties come at a cost in manufacturing complexity: double helical gears require more production steps than single helical or spur gears of equivalent size, and hence cost more \u2014 but the performance difference justifies the premium in demanding industrial drives.<\/p>\n

Korea Ever-Power produces industrial double helical gears<\/a> up to 1,370 mm (54 inches) outer diameter, 250 mm (10 inches) full face width, and 30\u00b0 helix angle, with a wide selection of pitch cutters. Material, diameter, capacity, and all geometric parameters are customisable to the customer’s drawing. Drawing files in PRO\/E, AutoCAD, SolidWorks, and UG are accepted.<\/p>\n<\/p><\/div>\n<\/div>\n

Korea Ever-Power has been a recognised double helical gear manufacturer and supplier in China for over ten years, supplying export customers in Europe, Southeast Asia, North America, the Middle East, and East Asia at competitive pricing with the quality assurance documentation international OEM customers require. Sample inspection reports \u2014 material, mechanical property, and dimensional \u2014 are provided with prototype deliveries. Third-party inspection is available. A one-year quality guarantee covers the gear from customer receipt.<\/p>\n

<\/p>\n

Technical Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Industrial Double Helical Gear \u2014 Product Specification<\/th>\n<\/tr>\n<\/thead>\n
Gear Type<\/strong><\/td>\nHerringbone (double helical)<\/td>\n<\/tr>\n
Tooth Form<\/strong><\/td>\nHerringbone \u2014 two opposite-hand helical sets on a common blank<\/td>\n<\/tr>\n
Shape<\/strong><\/td>\nRound \u2014 standard gear blank form; other hub profiles per drawing<\/td>\n<\/tr>\n
Maximum O.D.<\/strong><\/td>\n1,370 mm (54 inches) external gear<\/td>\n<\/tr>\n
Maximum Face Width<\/strong><\/td>\n250 mm (10 inches) full face width<\/td>\n<\/tr>\n
Maximum Helix Angle<\/strong><\/td>\n30\u00b0<\/td>\n<\/tr>\n
Pitch Cutter Selection<\/strong><\/td>\nWide selection of different pitch cutters available \u2014 confirm module at enquiry<\/td>\n<\/tr>\n
Material<\/strong><\/td>\nCustomised per drawing \u2014 carbon steel, alloy steel, stainless steel, and other grades<\/td>\n<\/tr>\n
Diameter<\/strong><\/td>\nCustomised \u2014 up to 1,370 mm maximum<\/td>\n<\/tr>\n
Capacity<\/strong><\/td>\nCustomised per application load requirement<\/td>\n<\/tr>\n
Size<\/strong><\/td>\nCustomised per drawing<\/td>\n<\/tr>\n
Drawing Software<\/strong><\/td>\nPRO\/E, AutoCAD, SolidWorks, UG, and other standard CAD formats<\/td>\n<\/tr>\n
Application<\/strong><\/td>\nIndustrial power transmission \u2014 cranes, fluid pumps, naval propulsion, compressors, general machinery<\/td>\n<\/tr>\n
Quality Guarantee<\/strong><\/td>\nOne year from customer receipt<\/td>\n<\/tr>\n
Sample Reports<\/strong><\/td>\nMaterial report, mechanical property report, dimensional report \u2014 provided with sample delivery<\/td>\n<\/tr>\n
Third-Party Inspection<\/strong><\/td>\nAvailable on request<\/td>\n<\/tr>\n
Storage Service<\/strong><\/td>\nAvailable for customers requiring buffer stock<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Manufacturing Capability and Process<\/h2>\n

\"Ever-Power<\/p>\n

The 1,370 mm maximum outer diameter represents Korea Ever-Power’s dedicated capacity for large industrial double helical gears. At this size, the gear blank alone weighs several tonnes and requires large-format machining equipment for all production stages: turning, hobbing or milling, heat treatment, and finish machining. The production process for each gear is defined by the specific module, material, and accuracy requirement on the customer’s drawing \u2014 there is no standard process that applies to all double helical gear configurations.<\/p>\n

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Hobbing vs Milling \u2014 Process Selection<\/strong><\/p>\n

Double helical gears can be produced by gear hobbing (generative method, higher accuracy, limited to configurations where the central groove is wide enough for cutter exit) or gear milling with formed cutters (more flexible regarding groove width, slightly lower accuracy). Korea Ever-Power selects the process based on the specific geometry of the customer’s drawing. For double helical gears where the central groove is too narrow for hobbing \u2014 which is the common situation in designs where face width has been maximised to increase load capacity \u2014 gear milling with form cutters is the correct and more common method.<\/p>\n<\/div>\n

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Pitch Cutter Range<\/strong><\/p>\n

Korea Ever-Power maintains a wide selection of different pitch cutters, covering the module range from small-pitch instrument gears through large-module heavy industrial gears in the single-digit module range at the 1,370 mm OD capacity limit. The cutter library breadth allows production of non-standard modules in addition to the standard metric module series \u2014 important for replacement gears in legacy industrial drives that may use non-standard module specifications from earlier design standards.<\/p>\n<\/div>\n

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Why Double Helical Gears Are More Expensive Than Spur Gears<\/strong><\/p>\n

The higher cost of double helical gears reflects the additional production steps required: two separate tooth-cutting operations (one per hand of helix), the precise angular phasing requirement between the two tooth sets, the central groove machining, and the more complex dimensional verification. The engineering value delivered \u2014 thrust-free operation, higher contact ratio, greater load capacity, quieter mesh \u2014 justifies the cost premium in applications where these properties are required. In applications where a spur gear would suffice, the premium is not justified. Industrial crane drives, naval propulsion gears, and large fluid pump drives are examples where the premium is always justified.<\/p>\n<\/div>\n

<\/p>\n

Our Services<\/h2>\n

\"measuring<\/p>\n

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Custom Production to Drawing or Sample<\/h3>\n

All products made to customer artwork or sample \u2014 free samples available for simple and low-value configurations. Drawing formats accepted: PRO\/E, AutoCAD, SolidWorks, UG. Material, module, diameter, face width, helix angle, and bore all specified per drawing.<\/p>\n<\/p><\/div>\n

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Sample Inspection Reports<\/h3>\n

Official inspection reports submitted with every sample delivery: material report confirming alloy grade, mechanical property report confirming tensile and hardness, and dimensional report confirming all geometric parameters against the drawing. Third-party inspection report from an accredited body available on request.<\/p>\n<\/p><\/div>\n

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Quality Guarantee<\/h3>\n

One-year quality guarantee from the date the customer receives the products. In the event of a quality issue, the complaint procedure activates immediately and a resolution and compensation scheme is implemented within 48 hours.<\/p>\n<\/p><\/div>\n

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Storage Service<\/h3>\n

Buffer stock storage available for customers with continuing supply programmes. Gears stored are inspected and documented before storage and re-inspected before each shipment release.<\/p>\n<\/p><\/div>\n<\/div>\n

<\/p>\n

Applications<\/h2>\n

\"types<\/p>\n

\n
\n
\ufe0f<\/div>\n

Cranes<\/h3>\n

Industrial crane hoisting and slewing gearboxes up to the maximum 1,370 mm diameter. Double helical gears eliminate axial thrust from the hoisting gear stage and reduce gear-generated vibration and noise transmitted to the crane structure and cab.<\/p>\n<\/p><\/div>\n

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<\/div>\n

Fluid Pumps<\/h3>\n

Large fluid pump gearboxes for water supply, wastewater, and industrial fluid handling. Thrust-free operation eliminates gear axial thrust from the pump shaft seal loading \u2014 a significant contributor to seal wear and leakage in conventional single helical pump drives.<\/p>\n<\/p><\/div>\n

\n
\u2693<\/div>\n

Naval Propulsion<\/h3>\n

Power transmission to propulsion screws in military ships for quieter and lower-vibration operation than conventional spur or single helical gearboxes. Double helical propulsion gears in large naval vessels reach the maximum diameter range \u2014 the 1,370 mm capacity accommodates the main reduction gear wheel in frigate and destroyer class propulsion systems.<\/p>\n<\/p><\/div>\n

\n
\u2699\ufe0f<\/div>\n

Industrial Compressors<\/h3>\n

Speed increaser and reduction gearboxes in large industrial gas compressors, where the herringbone tooth form reduces the vibration transmitted to compressor pipework and foundations compared with spur or single helical gearboxes at the same power level.<\/p>\n<\/p><\/div>\n

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<\/div>\n

General Industrial Power Transmission<\/h3>\n

Heavy conveyors, extruders, mixers, and general industrial reduction gearboxes in the large OD range where the power density advantage of the double helical form \u2014 higher torque per unit centre distance \u2014 justifies the higher manufacturing cost compared with equivalent spur gears.<\/p>\n<\/p><\/div>\n

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<\/div>\n

Wholesale and OEM Export<\/h3>\n

Industrial double helical gears manufactured for export OEM programmes in Europe, Southeast Asia, North America, the Middle East, and East Asia. Competitive wholesale pricing at volume, with full inspection documentation and quality guarantee for international OEM supply chains.<\/p>\n<\/p><\/div>\n<\/div>\n

<\/p>\n

Frequently Asked Questions<\/h2>\n
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What is the maximum double helical gear size Korea Ever-Power can produce?<\/p>\n

The maximum external double helical gear is 1,370 mm (54 inches) outer diameter with a full face width of 250 mm (10 inches) at up to 30\u00b0 helix angle. This capacity covers the majority of industrial double helical gear applications including large crane drives, compressor gearboxes, and naval propulsion main reduction gears. For gear sizes above this limit, contact our team \u2014 we can assess whether the specific configuration can be produced or can identify appropriate sourcing alternatives.<\/p>\n<\/div>\n

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Can Korea Ever-Power produce double helical gears from a sample rather than a drawing?<\/p>\n

Yes \u2014 production from a sample (reverse engineering) is available. Send the sample gear and Korea Ever-Power will measure the outer diameter, tooth count, module, helix angle, hand of helix, pressure angle, bore, hub dimensions, and groove width, and prepare a production drawing for your approval before cutting begins. For large industrial double helical gears where shipping the full sample is impractical, we can work from a detailed dimensional measurement report prepared by the customer’s engineering team, with key measurements confirmed by photographs.<\/p>\n<\/div>\n

\n
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What inspection reports are available with sample and production deliveries?<\/p>\n

Sample deliveries include official inspection reports covering: material report (chemical composition confirming the alloy grade), mechanical property report (tensile strength, yield strength, elongation, hardness), and dimensional report (all gear parameters against the drawing dimensions). Third-party inspection from a recognised accredited body is available on request for customers whose quality systems require independent verification. For production deliveries, the same report format is available on request at the order stage.<\/p>\n<\/div>\n

\n
\n

What is the quality guarantee on industrial double helical gears?<\/p>\n

Korea Ever-Power provides a one-year quality guarantee from the date the customer receives the products. If a quality issue arises during the guarantee period, the customer complaint procedure activates immediately upon notification and a resolution and compensation scheme is implemented within 48 hours. This guarantee covers manufacturing defects in material, geometry, and surface condition identifiable against the agreed drawing specification and inspection reports.<\/p>\n<\/div>\n

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\n

Is wholesale service available for distributors and trading companies?<\/p>\n

Yes \u2014 Korea Ever-Power offers wholesale service for distributors and trading companies purchasing for resale or for consolidation into industrial equipment programmes. Competitive pricing at volume is available; contact our team with annual volume estimates and the specific gear configurations required. The same quality documentation and guarantee terms apply to wholesale orders as to direct OEM orders. Contact us<\/a> to discuss wholesale pricing and terms.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Customer Reviews<\/h2>\n
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“We required 1,100 mm OD double helical gears for a large industrial crane hoisting gearbox. Korea Ever-Power confirmed the size was within their 1,370 mm capacity, produced from our AutoCAD drawing with the material and mechanical property reports required by our quality system. The dimensional report confirmed all tooth parameters within our drawing tolerance.”<\/p>\n

Kim Hyeon-joo<\/strong>  |  Gearbox Procurement Manager, Incheon Heavy Lifting Equipment  ·  Q1 2026<\/em><\/p>\n<\/div>\n

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“We supply water treatment pumping station gearboxes and used Korea Ever-Power’s industrial double helical gears<\/a> to replace a failed single helical stage. Seal life at the pump shaft improved after eliminating gear-driven axial load. Sample inspection reports met our incoming QA requirement without supplemental documentation.”<\/p>\n

Park Jae-won<\/strong>  |  Pump Systems Engineer, Seoul Water Treatment Engineering  ·  Q4 2025<\/em><\/p>\n<\/div>\n

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“We manufacture compressor speed increaser gearboxes and needed 30\u00b0 helix angle double helical gears at 850 mm OD. Korea Ever-Power confirmed the configuration was within their capacity (1,370 mm OD limit, 30\u00b0 max helix angle), produced from our SolidWorks drawing with third-party dimensional inspection. Storage service allows us to hold 4 gear sets in China as a maintenance spare buffer.”<\/p>\n

Lee Byeong-jun<\/strong>  |  Compressor Gearbox Design Lead, Daejeon Industrial Gas Systems  ·  Q2 2026<\/em><\/p>\n<\/div>\n

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“We import industrial double helical gears from Korea Ever-Power for wholesale distribution to European machinery rebuilders. The one-year guarantee and the third-party inspection reports are the two documentation items our European customers always require at incoming inspection. Both are available from Ever-Power as standard \u2014 no special requests needed.”<\/p>\n

Choi Bo-ram<\/strong>  |  Import Trading Manager, Busan Industrial Components Export  ·  Q3 2025<\/em><\/p>\n<\/div>\n

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“We needed free samples of two double helical gear configurations for a prototype naval auxiliary drive before committing to production tooling. Korea Ever-Power provided the samples with the full inspection report set. Sample dimensions matched the drawing at our incoming CMM check. Production order placed for 12 sets immediately after prototype approval.”<\/p>\n

Ryu Min-jun<\/strong>  |  Naval Systems Component Engineer, Gyeongnam Defence Equipment Co.  ·  Q1 2025<\/em><\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Related Products<\/h2>\n
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\n
\n \"Industrial
\n <\/a><\/p>\n
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Helical Gears<\/h3>\n

Korea Ever-Power’s full helical gear range covers industrial alloy steel double helical gears, heavy machinery gears, rolling mill gears, agricultural machinery gears, precision ground gears, and plastic gears \u2014 all custom-produced to drawing up to 1,370 mm OD.<\/p>\n

Browse Helical Gears \u2192<\/a>\n <\/div>\n<\/p><\/div>\n

\n
\n \"Forging
\n <\/a><\/p>\n
\n

\u30d9\u30d9\u30eb\u30ae\u30a2<\/h3>\n

Forged straight and spiral bevel gears for right-angle power transmission in crane slewing drives, naval steering gear, and compressor auxiliary drives \u2014 the intersecting-shaft complement to large parallel-axis double helical gears.<\/p>\n

Browse Bevel Gears \u2192<\/a>\n <\/div>\n<\/p><\/div>\n<\/div>\n

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Request a Quotation for Industrial Double Helical Gears<\/h3>\n

Send drawing (PRO\/E, AutoCAD, SolidWorks, UG) or sample gear. Max OD 1,370 mm, face width 250 mm, helix angle 30\u00b0. Material, module, diameter customised. One-year guarantee; third-party inspection available.<\/p>\n

Get a Quote Now<\/a>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Korea Ever-Power industrial double helical gears (herringbone gears) are manufactured to customer specification in any steel, alloy, or engineering material. Maximum external double helical gear diameter: 1,370 mm (54 inches), full face width 250 mm (10 inches), 30\u00b0 helix angle. Custom diameter, capacity, and material per drawing. Multiple pitch cutter selection. Drawing software supported: PRO\/E, AutoCAD, SolidWorks, UG. Sample inspection reports available: material, mechanical property, and dimensional. Third-party inspection available. One-year quality guarantee from customer receipt. Applications include cranes, fluid pumps, compressors, naval propulsion drives, and general industrial power transmission.<\/p>","protected":false},"featured_media":1514,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[4558],"product_tag":[],"class_list":["post-1513","product","type-product","status-publish","has-post-thumbnail","product_cat-helical-gear","pa_editor-cxm","first","instock","product-type-simple"],"_links":{"self":[{"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/product\/1513","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/comments?post=1513"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/media\/1514"}],"wp:attachment":[{"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/media?parent=1513"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/product_brand?post=1513"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/product_cat?post=1513"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/product_tag?post=1513"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}