Focusing on the design, manufacturing processes, heat treatment techniques, and key quality control points for all types of standard and non-standard gears.
| Parameter Item | Total Machining Range |
| Module / Diametral Pitch | M1 ~ M20 / DP 1 ~ DP 25, supports both metric and imperial standards |
| Number of Teeth (Z) | Z10 ~ Z200 |
| Maximum Tip Diameter | ≤ 800mm |
| Face Width Range | ≤ 250mm |
| Overall Shaft Length | ≤ 1500mm |
| Accuracy Grade | GB/T 10095 Grade 4~8 |
A spur gear shaft, fully designated as a straight-tooth cylindrical gear shaft, is a power transmission component that integrates a spur cylindrical gear and a drive shaft into a single, unified structure. As a widely adopted solution in parallel-shaft power transmission, it stands out for its compact form factor and exceptional transmission rigidity, making it well suited for medium-to-high speed, light-to-medium load applications that demand precise shaft alignment and consistent transmission accuracy.
Its gear teeth are machined directly onto the outer circumference of the shaft body, with the tooth trace running perfectly parallel to the shaft axis in a one-piece, integrally formed construction. Both ends of the shaft are typically machined with support journals, drive keyways, threaded sections and other mounting and locating features. When paired with a mating external gear in external tangential meshing, it transmits power and motion between two parallel shafts, with the input and output shafts rotating in opposite directions.
Compared with an assembly of a separate spur gear and drive shaft, the spur gear shaft eliminates assembly steps such as keyed connections and interference press fits. This completely removes common failure points like gear-to-shaft fit clearance and keyway shear, delivering higher overall transmission rigidity, superior shaft alignment, more stable running accuracy and a reduced installation footprint. The tradeoff is that worn or damaged teeth require full shaft replacement, resulting in higher maintenance costs than split configurations.
Spur gear shafts are widely used in reducer input and output shafts, machine tool feed drives, small gearboxes, motor output ends and other equipment where transmission rigidity and space-efficient layout are priorities.
Spur Internal Gear adopts the industry-standard involute spur tooth profile with a standard 20° pressure angle, with the tooth trace running perfectly parallel to the shaft axis. The gear and shaft stem are integrally formed, eliminating separate assembly steps, delivering superior shaft alignment and transmission rigidity, and featuring a compact overall build that effectively reduces the transmission footprint.
The full tooth face engages and disengages simultaneously, delivering a constant, accurate transmission ratio with no relative axial sliding between tooth flanks. The one-piece shaft design eliminates keyed connection clearance, resulting in more direct power transfer response. However, it tends to generate meshing impact and noise at high operating speeds, making it better suited for medium- and low-speed conditions.
This is a defining feature of spur gear shafts: only radial force components are generated during meshing, with no additional axial loads. Mating bearings do not need to account for axial load capacity, simplifying bearing selection and housing support design. The one-piece shaft body provides excellent torsional and bending resistance, and can withstand higher torque and radial loads.
Mechanical transmission efficiency can reach 98% to 99%. With no axial sliding friction on the tooth flanks, power loss is lower than that of equivalently precise helical gear shafts. Its core advantages lie in simple construction, low manufacturing and assembly costs, and stable transmission accuracy. The main limitations are noticeable impact noise at high speeds and limited load contact ratio, making it most suitable for medium- and low-speed transmission scenarios with steady loads.
| Parameter Item | Standard Production (General Service) | High-Precision Custom (Precision Drive) |
| Core Dimensions | ||
| Module / Diametral Pitch Range | M1 ~ M20 / DP 1 ~ DP 25 | M1.5 ~ M12 / DP 2 ~ DP 16 |
| Number of Teeth (Z) | Z10 ~ Z200 | Z12 ~ Z150 |
| Maximum Tip Diameter | ≤ 800mm | ≤ 600mm |
| Face Width Range | ≤ 250mm | ≤ 200mm |
| Shaft Diameter Range | φ10mm ~ φ300mm | φ12mm ~ φ250mm |
| Overall Shaft Length Range | ≤ 1500mm | ≤ 1200mm |
| Integrated Shaft Machining | Keyways, splines, threaded sections, stepped shafts and retaining grooves available | Single-setup full-process machining, with strict control of concentricity, radial runout and geometric tolerances |
| Tooth Profile & Accuracy | ||
| Tooth Profile Standard | Involute profile, supports both metric and imperial standards | Involute profile, supports custom non-standard profiles and profile shift coefficients |
| Standard Pressure Angle | 20° (default), 14.5°/15° available on request | 20°, with 14.5°/15°/22.5° and other custom angles available |
| Accuracy Grade | GB/T 10095 Grade 7~8Equivalent to AGMA Grade 10~11 / ISO Grade 7~8 | GB/T 10095 Grade 4~6Equivalent to AGMA Grade 12~14 / ISO Grade 4~6 |
| Tooth Profile Modification | Standard profile with basic tip relief available | Tip relief, lead crowning and end relief available |
| Tooth Surface Roughness | Ra 3.2 ~ 6.3μm | Ra 0.8 ~ 1.6μm |
| Remarks | The above are standard machining ranges for our spur gear shafts. Special oversized specifications, non-standard shaft configurations and integrated spline gear shafts can be custom manufactured per drawings.For quotation, please provide module, number of teeth, tip diameter, shaft diameter, shaft length, material, accuracy grade, quantity and other details. We will provide an accurate 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: 45# steel
As the baseline material choice for standard spur gear shafts, it delivers a balanced combination of strength and toughness after quenching and tempering, with good machinability and excellent cost-effectiveness. Tooth surface hardness can be enhanced via high-frequency induction hardening for consistent mechanical performance across the shaft body. Suitable for general transmission in small-to-medium modules at medium-to-low speeds with medium loads, it has limited hardenability and insufficient core strength in large-diameter shafts, and is not recommended for heavy-load or impact-prone conditions.
Representative grades: 40Cr, 20CrMnTi, 42CrMo
These are the core material for heavy-duty, high-precision spur gear shafts, with significantly superior hardenability compared to carbon steels. After carburizing, or quenching and tempering combined with surface hardening, they achieve a high-hardness, wear-resistant tooth surface paired with a strong, torsion-resistant shaft core, delivering excellent bending and fatigue resistance. Ideal for high-load, long-service-life transmission applications, they carry higher material and heat treatment costs.
Representative grades: 304, 316 stainless steel
Stainless steels provide excellent corrosion and rust resistance. Food-grade grades meet clean production requirements, making them suitable for light-duty, low-speed spur gear shafts in humid or corrosive environments; grade 316 is specified for strong acid and alkali conditions. They come at a higher cost with limited load capacity, and are not suitable for high-speed, heavy-duty applications.
Representative grades: tin bronze, brass H62
Copper alloys feature outstanding anti-friction and noise-damping performance, along with corrosion resistance and non-magnetic properties. Dimensional accuracy is readily achieved for small-module gear shafts, with tin bronze offering superior wear and friction reduction for high-cycle operation. Their overall strength is far lower than steel, so they are primarily used for light-duty, low-speed, small-module precision spur gear shafts.
Representative grades: POM, PA66
Engineering plastics are lightweight with inherent self-lubricating properties, and can be manufactured via one-piece injection molding. Paired with spur gear transmission, they deliver exceptional noise and vibration damping plus strong corrosion resistance. Suitable for small, light-duty, low-speed spur gear shafts to meet quiet operation, weight reduction and maintenance-free requirements, they have low load and speed limits, are prone to creep under sustained loads, and offer lower dimensional stability than metallic materials.
Representative grades: HT200, QT450
Cast iron offers easy castability, low cost and excellent vibration and noise damping, and can be produced as an integral shaft-gear structure. Ductile iron provides better strength and toughness than gray iron, with higher load capacity. Suitable for large-size, open-type spur gear shafts operating at low speeds with steady loads, it has poor impact resistance and is prone to failure under impact conditions.
As the primary application field, spur gear shafts are widely utilized in the low-speed stages of parallel-shaft gear reducers and gearmotors. The one-piece shaft-and-gear design eliminates assembly backlash, ensuring precise and consistent transmission ratios. Since they generate no axial thrust loads, bearing selection and housing design are simplified, making them a highly cost-effective solution for continuous medium- to low-speed transmission in fans, pumps, conveyor lines and similar industrial equipment.
Spur gear shafts are extensively used in the feed gearboxes and headstock transmissions of conventional lathes, milling machines and drill presses. They deliver excellent transmission rigidity, zero axial play, and accurate, dependable positioning, with straightforward setup and adjustment — well matched to the medium- and low-speed transmission needs of standard metal cutting processes.
These gear shafts see heavy use in the drive rollers and speed reduction modules of conveyor systems, sorting equipment and standard packaging machinery. Their simple construction enables easy maintenance and smooth, reliable power transfer, meeting the conveying demands of standard production cycles and delivering clear cost benefits in high-volume installations.
Alloy steel spur gear shafts are commonly specified for the travel gearboxes and work implement drives of loaders, bulldozers and light construction equipment. The integral shaft-gear structure provides strong torsional and bending resistance, while the straight-tooth meshing delivers simple, direct load transfer. They are well suited for medium- to low-speed heavy-duty construction duty, with easy maintenance and replacement.
They are the preferred choice for the reduction drive assemblies of standard winches, lifting platforms and chain hoists. Torque is transferred directly with no additional axial loads, which simplifies support structure design and ensures stable, reliable operation — aligned with the typical operating requirements of general hoisting and lifting applications.
Spur gear shafts are widely adopted in the power gearboxes and drive trains of tractors, harvesters and other farm equipment. Engineered for rugged, long-lasting performance with low manufacturing and upkeep costs, they accommodate the medium- to low-speed, high-torque power output demands of agricultural machinery, with strong adaptability to field operating 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 
