Spur Gear Module 2 Steel C45 Hardened 12 - 120 Tooth Motor Pinion Cogwheel Flat

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Spur Gear Module 2 Steel C45 Hardened 12 - 120 Tooth Motor Pinion Cogwheel Flat

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By HomeDIYer®

Models: Module 2【12 Tooth】

Amount: 1 pcs

Price:

$8.69 USD

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In stock (500 units), ready to be shipped

Quantity:

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Module 2 Spur Gear — Steel C45 Hardened Cogwheel for Reliable Power Transmission

When a slipping or undersized gear brings your build to a halt, you need a cogwheel that holds its geometry under load. Engineers, robotics builders, and small-batch machine makers who demand consistent tooth engagement will find these Module 2 spur gears a dependable foundation for any drive train.

Each gear is machined from C45 medium-carbon steel and surface-hardened for wear resistance. The flat-face (no hub) profile keeps the axial footprint compact. Available in tooth counts from 12 to 120 (Module 2), with an outer diameter range of approximately 28 mm (1.10 in) for the 12T up to approximately 244 mm (9.61 in) for the 120T, and a face width typically 20 mm (0.79 in).

Typical use cases include DC motor pinion drives in CNC router Z-axes, rack-and-pinion linear actuators for 3D printer gantries, and reduction stage gears in custom robotic arm joints — all scenarios where a Module 2 steel spur gear with a hardened tooth surface reduces maintenance intervals.

⚙️ Compatible with all standard Module 2 mating gears, racks, and pinions. Verify bore diameter and keyway requirements against your shaft spec before ordering.

✅ Key Features of These Module 2 Steel Spur Gears

🔩

C45 Steel Construction

Medium-carbon C45 steel provides a solid balance of machinability and tensile strength, suitable for moderate-to-high torque drive applications.

🔥

Surface-Hardened Teeth

Tooth flanks are hardened to extend service life under repeated mesh loading, reducing wear compared to through-soft steel gears.

📐

Module 2 Standard Profile

20° pressure angle, Module 2 tooth form — directly interchangeable with any standard Mod 2 rack, pinion, or mating gear in your drivetrain.

🎯

Wide Tooth-Count Range (12–120T)

73 tooth-count options from 12 to 120 teeth let you dial in the exact gear ratio your application requires without custom machining.

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Flexible Quantity Options

Order as 1, 2, 5, or 10 pieces per SKU — ideal for prototyping single units or stocking spares for production runs.

🏭

Flat-Face Cogwheel Design

No integral hub keeps the gear thin and lightweight, simplifying shaft-collar or set-screw retention in space-constrained assemblies.

📐 Technical Specifications — Module 2 Spur Gear

Module	2
Pressure Angle	20°
Tooth Count Range	12 – 120 teeth (see variant options)
Outer Diameter	See variant options
Face Width	Typically 20 mm (0.79 in)
Bore Diameter	See variant options
Material	C45 medium-carbon steel
Surface Treatment	Hardened tooth flanks
Gear Type	Spur gear (flat face, no hub)
Standard	DIN / ISO Module 2
Available Quantities	1 pcs / 2 pcs / 5 pcs / 10 pcs

❓ Frequently Asked Questions

How do I choose the right tooth count for my application?

Calculate your required gear ratio by dividing the driver tooth count by the driven tooth count. For a 3:1 reduction with a 12-tooth pinion on the motor shaft, you need a 36-tooth gear on the output shaft. Both must be Module 2 for correct mesh.

What is the outer diameter for a specific tooth count?

For Module 2 spur gears, the outer (tip) diameter = (tooth count + 2) × module. For example, a 20-tooth gear has a tip diameter of (20 + 2) × 2 = 44 mm. Apply this formula to any tooth count in the range.

How strong are these gears — what torque can they handle?

C45 hardened steel spur gears at Module 2 are suitable for moderate-to-high torque drives. Exact torque capacity depends on tooth count, face width, RPM, and application duty cycle. For critical load calculations, apply AGMA or ISO 6336 gear strength standards using the confirmed face width and material hardness of your specific variant.

Are these gears corrosion-resistant?

C45 steel is not inherently corrosion-resistant. For outdoor or humid environments, apply a light machine oil or grease coating during operation. If corrosion resistance is a primary requirement, consider stainless steel or plastic gear alternatives for your application.

Will these mesh with my existing Module 2 rack or pinion?

Yes — any gear or rack manufactured to the Module 2 standard with a 20° pressure angle will mesh correctly with these gears. Confirm the module and pressure angle of your existing components before ordering.

What bore diameter do these gears have, and can I re-bore them?

Bore diameter varies by tooth count and is listed in the variant details. C45 steel is machinable, so re-boring or adding a keyway is feasible with standard tooling. Confirm wall thickness after re-boring to ensure structural integrity.

Should I order 1 pc or a multi-pack?

Order 1 pc for prototyping or single-axis builds. The 2-pc option suits paired gear stages. The 5-pc and 10-pc packs offer a per-unit cost saving and are practical for production runs, spare-parts kits, or multi-axis machines requiring the same gear size.

🛒 Select your tooth count and quantity above, then add to cart.