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When a stripped or mismatched gear stalls your motor project, every hour of downtime costs you. Engineers, robotics builders, and DIY machine makers who need a dependable module 1.5 spur gear with a wide tooth-count selection can stop searching — this series covers 12T through 120T in a single product line, letting you match the exact gear ratio your drivetrain demands.
Each gear is machined from 45# medium-carbon steel, delivering a balance of hardness and toughness suited to moderate-to-heavy load applications. The flat (no hub) profile keeps the axial footprint compact. Tooth counts span 12T to 120T (approximately 0.47 in to 4.72 in pitch diameter range), with a module of 1.5 mm and a standard 20° pressure angle. Bore diameter varies by tooth count — see variant options for exact bore dimensions.
Typical use cases include DC motor gearboxes requiring a module 1.5 flat spur gear replacement, custom CNC router axis drives where a 45 steel transmission gear ensures longevity, and educational robotics platforms that need interchangeable module 1.5 gear sets for ratio experimentation.
| Module | 1.5 mm |
|---|---|
| Pressure Angle | 20° |
| Tooth Count Range | 12T – 120T (see variant options) |
| Material | 45# Medium-Carbon Steel |
| Gear Type | Spur Gear (Flat, No Hub) |
| Pitch Diameter | Module × Teeth (e.g., 1.5 × 20 = 30 mm / ~1.18 in) |
| Bore Diameter | See variant options |
| Face Width | See variant options |
| Surface Finish | See variant options |
| Packing Quantity | 1 PCS per order |
Determine your required gear ratio first: divide the driver tooth count by the driven tooth count. For example, a 20T driver meshing with a 40T driven gear gives a 2:1 reduction. Select tooth counts that achieve your target ratio while keeping the center distance practical for your housing. Larger tooth counts produce larger pitch diameters, so verify clearance in your enclosure.
45# medium-carbon steel offers a tensile strength typically in the range of 600–800 MPa depending on heat treatment. These gears are suited to moderate-to-heavy intermittent loads common in motor gearboxes, conveyor drives, and robotics joints. For continuous high-torque or shock-load applications, consider whether additional surface hardening is required for your specific duty cycle.
45# carbon steel has limited inherent corrosion resistance. For indoor, dry environments this is generally acceptable. If your application involves moisture, humidity, or mild chemical exposure, apply a light machine oil coating for protection, or consider stainless steel alternatives for harsh environments.
Yes — any gear or rack manufactured to the Module 1.5 standard with a 20° pressure angle will mesh correctly with these gears. Confirm the module and pressure angle of your existing components before ordering. Module 1.5 is not interchangeable with Module 1, Module 2, or other module sizes.
Measure your shaft diameter precisely with calipers. The bore diameter for each tooth-count variant is listed in the variant options. If your shaft diameter falls between standard bore sizes, a gear with a larger bore can be adapted using a shaft sleeve or bushing. Always confirm the bore-to-shaft fit (clearance vs. interference) matches your torque transmission requirements.
Yes. Module 1.5 spur gears are commonly used in CNC router Z-axis lifts, rotary axis drives, and extruder gear trains where a rack-and-pinion or gear-pair arrangement is needed. Pair with a matching M1.5 rack for linear motion, or use two gears of complementary tooth counts for a speed/torque reduction stage. Verify that the face width and bore suit your motor shaft and frame design.
A flat (no-hub) spur gear has a uniform thickness across its face with no extended boss or collar. This minimizes axial space and allows the gear to sit flush against a shoulder or collar on the shaft. A hub gear has an extended cylindrical boss that provides more shaft engagement length and often includes set-screw holes. Flat gears are preferred when axial space is limited or when a custom hub arrangement is used.
