Focusing on the design, manufacturing processes, heat treatment techniques, and key quality control points for all types of standard and non-standard gears.
| Parameter | Specification |
| Module | M1–M10, Customizable |
| Pressure Angle | 20° Standard |
| Helix Angle | 15° / 19° / 20° / 30° |
| Hand | Left-Hand / Right-Hand |
A helical rack is a precision mechanical transmission component used in linear motion systems. It forms part of a rack-and-pinion drive. Its teeth are arranged at a helix angle. This design allows the pinion and rack to engage progressively and maintain more continuous tooth contact. The system converts rotary motion into linear motion.
Compared with conventional spur racks, helical racks provide more continuous tooth contact during meshing. This helps improve load distribution and reduce transmission impact and vibration. It also allows smoother linear motion. The helical tooth design can support better positioning accuracy and operating stability. These characteristics make helical racks suitable for equipment requiring precise positioning, high travel speeds, and reliable long-term operation.
As precision linear transmission components, helical racks are widely used in CNC machine tools, automation equipment, industrial robots, laser processing equipment, and precision positioning systems. Dimensions, materials, and accuracy grades can be customized according to equipment requirements.
The key feature of a helical rack is its helix angle. The teeth are arranged at a specific angle. This allows the pinion and rack to engage and disengage progressively. It also helps maintain more continuous tooth contact.
Compared with spur racks, this structure provides a smoother meshing process. It helps reduce the impact caused by sudden tooth engagement. Continuous tooth contact also improves load distribution across the tooth surfaces. This contributes to more stable operation.
A helical rack is an important component of a rack-and-pinion transmission system. It is typically paired with a helical pinion. As the pinion rotates, its teeth drive the rack along a linear path. This converts rotary motion into linear motion.
During operation, the pinion and rack maintain stable engagement. The system can therefore provide precise position control. It is suitable for machinery requiring repeated positioning and continuous linear movement.
The helical tooth arrangement allows the rack and pinion to enter and leave mesh progressively. They do not engage instantaneously. Multiple tooth surfaces can therefore share the transmitted load during operation.
Compared with spur racks, helical racks can provide better load distribution. They can also reduce stress concentration on individual teeth. This helps lower vibration and operating noise. It also improves the smoothness and stability of the transmission system.
Helical racks can meet the requirements of automation equipment, CNC machine tools, and robotic systems. Key factors include tooth profile accuracy, tooth pitch accuracy, and mounting dimensions. These factors affect positioning accuracy and repeatable motion control.
Materials can be selected according to operating conditions and load requirements. Suitable heat treatment can also be applied to improve strength and wear resistance. This can support longer service life under appropriate operating conditions.
Proper tooth profile design is also important. Material selection and machining accuracy should match the application. Together, these factors help helical racks provide reliable performance in long-term industrial transmission systems.
| Parameter | Standard Mass-Production Model (General Service) | High-Precision Custom Model (Precision Transmission) |
| Core Dimensional Specifications | ||
| Module Range | M1–M20 | M0.5–M12 |
| Tooth Profile | Standard involute helical tooth profile | High-precision involute helical tooth profile; non-standard designs available |
| Maximum Machining Length | ≤ 3000 mm, segmented machining available | ≤ 2000 mm, high-precision single-piece machining |
| Face Width | Customized according to load and installation requirements | Optimized according to transmission accuracy and rigidity requirements |
| Helix Angle | 15° / 19° / 20° / 30° | Customizable according to speed, noise, and meshing requirements |
| Hand | Left-hand / right-hand | Special handedness and matched-pair machining available |
| Tooth Profile & Accuracy Specifications | ||
| Pressure Angle | 20° standard | 20° standard; 14.5° / 15° / 25° available on request |
| Accuracy Class | GB/T 10096 Class 7–8 | Up to GB/T 10096 Class 4 |
| Tooth Pitch Accuracy | Standard tooth pitch control | High-precision tooth pitch control to reduce linear motion error |
| Lead Modification | Standard lead profile | Tip relief and lead crowning available to improve meshing stability |
| Tooth Surface Roughness | Ra 3.2–6.3 μm | Ra 0.8–1.6 μm |
| Manufacturing & Performance Capabilities | ||
| Machining Processes | Gear hobbing, gear milling, and other conventional processes | Gear hobbing, gear milling, gear grinding, and other precision processes |
| Matched Pair Processing | Compatible with standard helical gears | Precision gear-rack matching available to optimize contact performance |
| Remarks | The above are standard machining parameter ranges for our helical racks. Special sizes and non-standard structures can be custom-made according to your drawings. For a quotation, please provide module, pressure angle, helix angle, length, material, accuracy class, and quantity; we will reply with an exact quote within 12 hours. | |
High-quality blanks are forged and normalized to eliminate internal stress and stabilize material structure.
Turning, milling and hobbing/shaping are applied to form the target tooth profile with strict accuracy control.
Carburizing quenching or tempering processes to improve tooth surface hardness and core toughness.
Grinding of tooth flanks, bores and datum faces to correct deformation and enhance meshing precision.
Full-dimensional verification by gear measuring center and CMM to qualify products before release.
Professional anti-rust and protective packaging to keep products intact during storage and transit.
High-precision gear grinding delivers tooth surface roughness as low as Ra 0.4, with tight meshing, low vibration and noise for smoother equipment operation.
Premium materials matched with precise heat treatment ensure wear-resistant tooth surfaces and impact-resistant core, cutting maintenance and replacement costs.
Custom solutions for high-speed heavy load, corrosion resistance and food-grade scenarios, eliminating trial-and-error costs in product selection.
Scaled production supports tiered pricing for bulk orders with consistent quality; full-process control guarantees stable lead time and complete after-sales support.
Representative Grade: C45
C45 steel offers a good balance of mechanical properties, machinability, and cost. Quenching and tempering or surface hardening can improve tooth surface hardness and wear resistance. It is suitable for general automation equipment, industrial transmission systems, and medium-load linear motion applications.
Representative Grades: 40Cr, 42CrMo
40Cr and 42CrMo provide high strength, toughness, and fatigue resistance. Heat treatments such as quenching and tempering can improve tooth surface hardness and wear resistance. 40Cr suits medium- to high-load transmission, while 42CrMo is better suited to heavy-duty and continuous-operation applications.
Representative Grades: 304, 316, 420
Stainless steel provides good corrosion resistance and environmental durability, making it suitable for humid, corrosive, and hygienic environments. 304 and 316 are suitable for general corrosion-resistant applications, while 420 can achieve higher hardness and wear resistance through heat treatment. Typical applications include food, medical, and chemical equipment.
Representative Grade: 38CrMoAl
38CrMoAl has good nitriding properties and can achieve high surface hardness, wear resistance, and dimensional stability after nitriding while maintaining good core toughness. It is suitable for CNC machine tools, automation equipment, and precision positioning systems requiring high accuracy and long-term operating stability.
Representative Grades: QT450, QT500
Ductile iron combines good strength, wear resistance, vibration damping, and castability. It is suitable for larger helical racks used at low speeds and under medium loads, particularly in industrial transmission and conveying equipment where vibration control and structural stability are important.
Representative Grades: 6061, 7075
Aluminum alloys are lightweight, corrosion-resistant, and easy to machine, helping reduce the overall weight of moving components. 6061 offers balanced mechanical properties, while 7075 provides higher strength. They are suitable for light-load linear transmission in automation equipment, robotics, and precision motion systems.
In CNC machining equipment, gantry machines, and worktable drive systems, helical racks work with pinions to provide high-speed, high-precision linear movement. Their continuous meshing helps reduce vibration and improve machining stability and positioning accuracy.
In automated production lines, helical racks are used in handling mechanisms, positioning systems, and conveying equipment to provide smooth linear motion. They are well suited to frequent reciprocating movement and long-term continuous operation, helping improve efficiency and positioning consistency.
In robot auxiliary axes, linear actuators, and automated mobile platforms, helical racks can drive moving components for precise position control. Their smooth meshing characteristics make them suitable for applications requiring good repeatability, motion stability, and positioning accuracy.
In laser cutting machines, inspection equipment, and other precision machinery, helical racks provide fast and stable linear movement. Proper control of tooth geometry, tooth pitch, and installation accuracy helps meet requirements for motion accuracy, repeatability, and operating stability.
In industrial conveyors, material handling systems, and automated storage equipment, helical racks can drive slides, moving platforms, and actuators. Their smooth operation and good load-carrying capacity make them suitable for medium- to high-speed, continuous-duty systems requiring reliable positioning.
In industrial doors, automatic doors, large moving platforms, and lifting mechanisms, helical racks work with pinions to provide stable linear drive. Their continuous meshing and reduced vibration make them suitable for frequent starting and stopping, long-stroke movement, and long-term operation.
Inner VCI vacuum anti-rust process fully seals tooth flanks and critical machined surfaces, effectively resisting salt spray and moisture during ocean and air freight to keep precision gears corrosion-free throughout long-distance transit.
We select cost-effective logistics channels with stable transit time and controlled costs. Full logistics tracking is available with real-time status updates to ensure reliable and punctual delivery.
All products are covered by a 1-year warranty. Quality defects caused by non-human factors are fully guaranteed, removing your procurement concerns.
Our professional technical and after-sales team is always available to respond quickly to inquiries and after-sales needs, and efficiently resolve issues during installation and operation.
We support full-parameter OEM/ODM customization based on 2D/3D drawings or physical samples, including module, tooth profile, material and heat treatment specifications. You only need to provide core gear parameters, detailed drawings or physical samples to start the customization process.
You can send physical samples to us via international courier. Upon receipt, we will complete full-dimensional measurement and parameter verification, then arrange sample production after confirming the solution, ensuring the finished product fully matches the original in installation dimensions and transmission performance.
Prototype orders usually ship within 15–25 days, subject to heat treatment and grinding scheduling. Lead time for bulk orders will be confirmed after process finalization, with stable and well-managed production schedules.
We adopt a tiered pricing policy — the larger the order quantity, the more favorable the unit price. All orders follow the same production and quality inspection standards with strict accuracy control. Quality will never be compromised for larger order volumes.
We can include dimensional inspection reports, hardness test records and material certificates with each shipment. For high-precision key projects, professional inspection data from CMM and gear measuring centers is also available.
All products come with a 1-year warranty covering material defects and manufacturing quality issues under normal use. We also have a professional technical team to provide full-process consultation and selection support.
Spur gears feature a simple structure and no axial load, ideal for medium-low speed general transmission with higher cost-effectiveness. Helical gears run smoother with lower noise and higher load capacity, suitable for high-speed heavy-duty applications. We can recommend the optimal solution based on your actual requirements.
+86 184 3796 0706 
info@destinytrans.com 
