2 Modulus Spur Gear — Precision 45 Steel Transmission Gears for Robotics & Automation
Stripped gears and mismatched drive components are a constant headache for engineers and DIY builders working on precision motion systems. These 2 Modulus spur gears are engineered for builders who demand dimensional accuracy and material reliability in robotics, CNC machines, and small-batch automation rigs.
Machined from 45 carbon steel, each gear features a 2-module tooth profile with outer diameters ranging from 24mm (10T) to 114mm (55T), available in single-piece or multi-pack quantities. Tooth count spans 10T through 55T, covering a wide gear ratio range in a single product family.
Typical use cases include robotic arm joint drives, conveyor gear trains, 3D printer extruder assemblies, and custom CNC axis transmission systems requiring reliable spur gear meshing with standard 2-module pitch compatibility.
⚙️ Compatible with all standard Module 2 (M2) gear systems — pairs with M2 racks, pinions, and mating spur gears.
✅ Key Features of These 2 Modulus Spur Gears
🔩45 Carbon Steel Construction
High-strength carbon steel provides excellent wear resistance and load-bearing capacity for demanding drive applications.
📐Standard M2 Tooth Profile
Module 2 pitch ensures direct interchangeability with all M2-compatible racks, pinions, and mating gears.
📏Wide Size Range: 10T–55T
OD spans 24mm to 114mm, covering a broad gear ratio spectrum within a single consistent product family.
🎯Precision Machined Teeth
CNC-machined tooth geometry ensures smooth meshing, reduced backlash, and consistent torque transmission.
📦Multi-Pack Quantity Options
Available in 1, 2, 3, 4, 5, or 10-piece packs — ideal for prototyping, small-batch builds, or spare inventory.
🔧Flat Gear Profile
Flat spur gear design simplifies installation in parallel-shaft drive systems without requiring helical alignment.
📐 Technical Specifications — 2 Modulus Spur Gear
| Module |
2 (M2) |
| Tooth Count |
10T – 55T (see variant options) |
| Outer Diameter (OD) |
24mm – 114mm (see variant options) |
| Material |
45 Carbon Steel |
| Gear Type |
Spur Gear (Flat) |
| Tooth Profile |
Standard Module 2 |
| Hub / Bore |
See variant options |
| Face Width |
See variant options |
| Surface Finish |
Natural steel / machined |
| Quantity per Pack |
1 / 2 / 3 / 4 / 5 / 10 pcs |
❓ Frequently Asked Questions
What does "Module 2" mean and will it mesh with my existing gears?
Module (M) is the standard metric measurement of gear tooth size. Module 2 means the pitch diameter equals 2 × tooth count in mm. These gears will mesh correctly with any other M2 spur gear, rack, or pinion — regardless of brand — as long as the module matches.
What tooth count should I choose for my gear ratio?
Gear ratio = driven gear teeth ÷ driving gear teeth. For example, pairing a 10T pinion with a 30T gear gives a 3:1 reduction. Select your tooth counts based on the speed and torque ratio your application requires. This product family covers 10T–55T, giving you a wide ratio range.
Is 45 carbon steel strong enough for my application?
45 steel (equivalent to C45 / SAE 1045) is a medium-carbon steel widely used in mechanical transmission components. It offers good tensile strength (typically 600–800 MPa) and wear resistance, making it suitable for robotics, CNC drives, and light-to-medium industrial applications. For heavy shock loads, consider heat-treated variants.
What is the bore diameter and keyway configuration?
Bore diameter and keyway dimensions vary by tooth count and OD. Please contact us to confirm bore specs for your specific variant before ordering, especially if you need a press-fit or keyed shaft connection.
Can I use these gears outdoors or in wet environments?
45 carbon steel is not inherently corrosion-resistant. For outdoor or humid environments, we recommend applying a light machine oil coating or using a sealed enclosure. For corrosive environments, consider stainless steel or plastic gear alternatives.
How do I select the right quantity pack?
Single packs (1 pc) are ideal for prototyping or replacement. Multi-packs (2–10 pcs) offer better per-unit value for small-batch builds, spare parts inventory, or classroom/lab use. The per-piece price decreases with larger pack sizes.
Are these compatible with 3D printer or CNC machine drive systems?
Yes. M2 spur gears are commonly used in CNC axis drives, extruder gearboxes, and custom motion systems. Verify your existing gear module before ordering — many hobby CNC and printer systems use M1, M1.5, or M2 depending on the design.
🛒 Select your tooth count (Teeth-OD) and quantity above, then add to cart.
