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 |
| Tooth System | Gleason, Matched Pair Available |
| Module | Customizable |
| Shaft Angle | 90° Standard, Customizable |
| Pressure Angle | 20° Standard, Customizable |
A spiral bevel gear is a precision transmission component for intersecting shafts. It is a key type of bevel gear drive. A matched gear pair transmits motion and torque between the shafts. This changes speed, torque, and the direction of power transmission.
Spiral bevel gears feature curved teeth with a defined spiral angle. Their high contact ratio allows more teeth to engage at the same time. This provides high load capacity, smooth operation, low meshing noise, and good impact resistance. Progressive tooth contact also helps reduce transmission shock and vibration. This makes spiral bevel gears suitable for high-speed and heavy-duty applications.
These gears are widely used in automotive differentials, industrial gear reducers, construction machinery, machine tool spindles, marine drive systems, mining equipment, and agricultural machinery. Common materials include 20CrMnTi, 40Cr, and 20CrMo. Module, tooth count, transmission ratio, accuracy grade, mounting requirements, and operating conditions can be customized.
Spiral bevel gears use curved tooth lines. They are commonly designed according to Gleason-type or constant-depth tooth systems. Specialized cutting tools form the curved tooth surfaces. These tools help achieve the required meshing characteristics.
The teeth follow a curved path along the cone. The nominal spiral angle is usually measured at the midpoint of the face width. This angle is an important design reference for spiral bevel gear geometry.
Standard tooth systems help maintain consistent meshing accuracy and contact patterns. Precision gears can also be manufactured and lapped as matched pairs. This approach helps optimize tooth contact and transmission performance.
Compared with straight bevel gears, the spiral tooth design generates greater axial forces. The force direction changes with gear rotation and hand. Therefore, bearings and housings must handle axial loads in both directions. This adds structural requirements but also supports smoother transmission and higher load capacity.
A spiral bevel gear pair is normally used to transmit power between intersecting shafts. A 90° shaft angle is most common. The pinion drives the mating gear to convert speed and torque while changing the direction of power transmission.
The teeth enter and leave contact gradually along the face width. More teeth can share the load at the same time. This gives the spiral bevel gear drive a higher contact ratio than a straight bevel gear drive. It also reduces transmission impact and improves load distribution.
This meshing characteristic allows the gear pair to operate smoothly under high torque and high reduction requirements. Multiple spiral bevel gear pairs can also be combined for power splitting, direction changes, and other transmission layouts.
A properly designed spiral bevel gear drive can achieve high mechanical efficiency. Correct installation and suitable lubrication are also important for stable operation.
The progressive tooth engagement helps reduce vibration and meshing noise. As a result, spiral bevel gears generally provide smoother operation at higher speeds than straight bevel gears.
Common manufacturing processes include gear milling, gear grinding, and matched lapping. These processes help control transmission accuracy and tooth contact. Heat treatments such as carburizing and hardening or quenching and tempering can improve tooth surface hardness, wear resistance, and contact fatigue strength.
The main advantages of spiral bevel gears include a high contact ratio, strong load capacity, smooth operation, and relatively low noise. They are suitable for high-speed and heavy-duty transmission systems where stable power transfer is important.
Compared with straight bevel gears, however, spiral bevel gears require more complex machining and higher manufacturing costs. Their greater axial forces also place higher demands on bearings, housings, and other supporting structures.
Materials for spiral bevel gear transmission systems, such as 20CrMnTi, 40Cr, and 20CrMo, can be selected according to operating conditions. Module, tooth count, transmission ratio, spiral angle, accuracy grade, and heat treatment can be customized for different loads, speeds, and installation spaces.
This makes the spiral bevel gear suitable for applications ranging from light-duty precision drives to heavy-duty industrial transmission systems.
| Parameter | Standard Mass-Production Model (General Service) | High-Precision Custom Model (Precision Transmission) |
| Core Transmission Specifications | ||
| Tooth System | Gleason | High-precision tooth system; non-standard designs available |
| Module Range | M1.5–M20 | M1–M12 |
| Number of Teeth | Designed according to transmission ratio and structural requirements | Optimized for transmission ratio, noise, and service life |
| Face Width | Designed according to load and installation space | Optimized for load capacity and contact accuracy |
| Shaft Angle | 90° standard; other angles available | Non-standard shaft angles available |
| Transmission Ratio | Customized according to requirements | Precisely matched to transmission and operating requirements |
| Spiral Angle | Customized according to design requirements | Optimized for smoother meshing |
| Hand | Left-hand / right-hand | Matched-pair design available |
| Tooth Profile & Accuracy Specifications | ||
| Tooth Profile | Curved tooth line with standard tooth system | Tooth modification, lead correction, and pair optimization available |
| Pressure Angle | 20° standard | Special pressure angles available |
| Accuracy Class | Selected according to application requirements | ISO, AGMA, and other precision grades available |
| Tooth Contact | Standard contact pattern control | Optimized tooth contact for improved running stability |
| Tooth Surface Roughness | Ra 1.6–3.2 μm | Ra 0.4–1.6 μm |
| Materials & Manufacturing Capabilities | ||
| Material Selection | 45 Steel, 40Cr, 20CrMo, 20CrMnTi, and other materials | 42CrMo, 20CrMnTi, and other high-performance alloy steels |
| Heat Treatment | Quenching and tempering, induction hardening, carburizing and hardening | Precision heat-treatment control to improve wear resistance and fatigue life |
| Machining Processes | Rough machining, gear milling, heat treatment, and matched lapping | Gear grinding, lapping, and precision matched machining |
| Matched Pair Processing | Gear pair machining available | Pinion and gear matched lapping for optimized meshing |
| Remarks | The above are standard machining parameter ranges for our spiral bevel gears. Special sizes and non-standard structures can be custom-made according to your drawings. For a quotation, please provide tooth system, module, number of teeth, shaft angle, material, accuracy class, and quantity. | |
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: 45 Steel / C45
45 steel offers a good balance of strength, toughness, and machinability at a relatively low cost. Quenching and tempering or surface hardening can improve tooth surface hardness and wear resistance. It is suitable for general spiral bevel gears used at small to medium modules, medium-low speeds, and moderate loads.
Representative Grades: 40Cr, 42CrMo
40Cr and 42CrMo provide high strength, toughness, and fatigue resistance. Quenching and tempering or induction hardening can improve tooth surface hardness and wear resistance. They are suitable for medium- to high-load, continuous-duty applications in construction machinery, gear reducers, and industrial transmission systems.
Representative Grades: 20CrMnTi, 20CrMo
20CrMnTi and 20CrMo develop a hard, wear-resistant surface layer and a tough core after carburizing and hardening. They provide good wear resistance, fatigue strength, and impact resistance, making them suitable for automotive differentials, heavy-duty gear reducers, mining equipment, and marine transmission systems.
Representative Grades: 304, 316, 420
Stainless steel offers good corrosion resistance and environmental durability. 304 and 316 are suitable for humid and corrosive environments, while 420 can achieve higher hardness and wear resistance through heat treatment. They are commonly used in food processing, pharmaceutical, chemical, and other specialized transmission equipment.
Representative Grade: ZG45
Cast steel provides good castability along with relatively high strength and load capacity, making it suitable for large and complex spiral bevel gears. It is commonly used in low-speed, heavy-duty transmission systems for mining, metallurgy, and heavy industrial equipment.
Representative Grades: QT450, QT500
Ductile iron combines good castability with adequate strength, wear resistance, and vibration damping. It is suitable for large spiral bevel gears used in low-speed, medium- to heavy-load applications, including mining equipment, metallurgical machinery, and general industrial transmission systems.
Spiral bevel gears are commonly used in automotive drive systems, four-wheel-drive systems, differentials, transfer cases, and construction machinery to change power direction and transmit torque between intersecting shafts. Their progressive meshing helps reduce transmission impact and supports reliable operation under high loads and demanding conditions.
In CNC machine tools, machining centers, and precision mechanical systems, spiral bevel gears are used for spindle drives, reversing mechanisms, and power distribution. Their smooth meshing helps reduce vibration and noise while supporting the transmission stability and accuracy required for precision equipment.
In marine propulsion systems, steering mechanisms, and auxiliary power equipment, spiral bevel gears are used for power direction changes and torque transmission. Their high load capacity and fatigue resistance make them suitable for continuous operation and varying loads in marine and other demanding power transmission systems.
In tractors, harvesters, and other agricultural machinery, spiral bevel gears are used for power redirection and torque transmission. Their load capacity and stable operation make them suitable for long-term service and transmission systems exposed to fluctuating or impact loads.
In industrial gear reducers, transmission boxes, and power distribution units, spiral bevel gears transmit power and change direction between intersecting shafts. Proper tooth design, material selection, and accuracy control allow them to meet the requirements of medium- to high-speed and higher-load transmission systems.
In mining equipment, metallurgical machinery, and heavy industrial systems, spiral bevel gears are used for power redirection and high-torque transmission. Combined with high-strength materials and suitable heat treatment, they can support high loads, continuous operation, and demanding working conditions.
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 
