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When your motion-control project demands consistent torque transfer and dimensional accuracy, undersized or mismatched gears become an immediate bottleneck. Engineers, makers, and workshop professionals who build CNC routers, robotic arms, conveyor systems, and custom gearboxes rely on standardized module gears that slot into their designs without rework.
These 1.5 module spur gears are machined from 45# medium-carbon steel, offering a balance of hardness and machinability suited to moderate-load transmission applications. Each gear features a 15 mm (approximately 0.59 in) face width and is available in tooth counts ranging from 12T to 120T, covering pitch circle diameters from approximately 18 mm (0.71 in) for 12T up to 180 mm (7.09 in) for 120T. Bore diameter varies by tooth count — see variant options for exact bore specifications.
Typical use cases include DIY CNC axis drives requiring a 1.5 mod gear ratio stage, robotic joint reduction assemblies where a compact spur gear pair replaces a belt stage, and custom industrial conveyor speed-reduction gearboxes where off-the-shelf module gears reduce lead time. The standardized 1.5 module pitch ensures direct meshing compatibility with any other 1.5 mod gear in your drivetrain.
45# Medium-Carbon Steel Construction
Machined from 45# steel for reliable strength under moderate radial and tangential loads in transmission and automation applications.
Wide Tooth-Count Selection (12T–120T)
91 tooth-count variants from 12T to 120T let you dial in the exact gear ratio your drivetrain requires without custom machining.
Consistent 15 mm Face Width
A uniform 15 mm (0.59 in) face width across all variants ensures predictable load distribution and straightforward stack-up calculations.
Standardized 1.5 Module Pitch
Module 1.5 is a widely adopted metric gear standard, guaranteeing direct mesh compatibility with any other Mod 1.5 gear in your system.
20° Pressure Angle
The 20° pressure angle delivers a favorable balance between tooth strength and smooth engagement, reducing noise and wear in continuous-duty cycles.
Suitable for Multi-Stage Gearbox Designs
Compact spur profile allows tight center-distance layouts in multi-stage reduction gearboxes for robotics, CNC, and conveyor drive systems.
| Module | 1.5 |
|---|---|
| Pressure Angle | 20° |
| Tooth Count Range | 12T – 120T (see variant options) |
| Face Width (Thickness) | 15 mm (0.59 in) |
| Material | 45# Medium-Carbon Steel |
| Pitch Circle Diameter | Module × Teeth (e.g., 1.5 × 20 = 30 mm) |
| Bore Diameter | See variant options |
| Keyway | See variant options |
| Surface Finish | See variant options |
| Gear Type | Spur (straight tooth) |
| Quantity per Order | 1 Pcs |
Determine your required gear ratio first: divide the driver tooth count by the driven tooth count to get the ratio. For example, a 20T driver meshing with a 60T driven gear gives a 3:1 reduction. Select tooth counts that achieve your target ratio while keeping the center distance within your design envelope. Center distance = (T1 + T2) × Module / 2.
45# steel spur gears at 1.5 module are suited to moderate-load, low-to-medium speed applications such as CNC axis drives, robotic joints, and light conveyor systems. For heavy-duty or high-speed applications, consider a larger module or alloy steel gear. Exact load ratings depend on tooth count, RPM, and lubrication — consult a gear design reference (e.g., AGMA standards) for precise calculations.
45# carbon steel has moderate corrosion resistance. For environments with moisture, chemicals, or outdoor exposure, we recommend applying a light machine oil or grease coating during operation, or considering stainless steel or nylon gears for corrosive conditions. Contact us to confirm if a surface treatment option is available for your tooth count.
Yes — any two gears of the same module and pressure angle will mesh correctly regardless of tooth count. These gears are Mod 1.5 with a 20° pressure angle, so they are directly compatible with any other Mod 1.5 / 20° spur gear. Verify that the calculated center distance matches your housing before assembly.
Pitch Circle Diameter (PCD) = Module × Number of Teeth. For a 1.5 module gear: a 20T gear has PCD = 1.5 × 20 = 30 mm; a 60T gear has PCD = 1.5 × 60 = 90 mm. The outside diameter (OD) = (Teeth + 2) × Module, so a 20T gear OD = 33 mm.
Bore diameter varies by tooth count and is listed in the variant options. Smaller tooth counts (12T–20T) typically have smaller bores, while larger tooth counts have proportionally larger bores. If you need a specific bore size or keyway, please contact us before ordering to confirm compatibility with your shaft diameter.
For intermittent or very low-speed applications, brief dry operation is possible, but continuous dry running will accelerate tooth wear on 45# steel gears. We recommend applying a suitable gear grease or oil (ISO VG 220 or equivalent) to the tooth flanks for any sustained operation to extend service life and reduce noise.
