1 Mod Spur Gear Pinion C45 Steel Gear Motor Gear with Steps 30T-125T Bore 6-15mm

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1 Mod Spur Gear Pinion C45 Steel Gear Motor Gear with Steps 30T-125T Bore 6-15mm

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Number of Teeths: 31 Teeth

Number of Teeth X Bore Diameter: 31 Teeth X 6mm

Quantities: 1

Price:

$13.57 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

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Module 1 Spur Gear Pinion — C45 Steel with Stepped Hub for Precise Motor Drive

Engineers and makers working on motor drive assemblies often struggle to find a spur gear that combines a true metric module pitch with a robust stepped bore hub — one that locks onto a shaft without slipping under load. This Module 1 spur gear pinion is designed for that exact challenge, and suits robotics builders, CNC machine designers, and small-batch automation integrators who need dimensional consistency across a wide tooth range.

Each gear is machined from C45 medium-carbon steel and features a stepped hub profile that provides a positive axial shoulder for shaft collars or retaining rings. The module (Mod 1) pitch ensures full interchangeability with any standard Mod 1 mating gear or rack. Tooth counts span 31 to 120 teeth, with bore diameters ranging from 6 mm (0.24 in) to 15 mm (0.59 in) to accommodate common motor shaft sizes.

Typical use cases include DC gear-motor output stages in tabletop CNC routers, stepper-driven axis drives in 3D printer extruder gearboxes, and rotary indexing mechanisms in light industrial automation — all applications where a module 1 spur gear pinion with a keyed or press-fit bore delivers reliable torque transmission.

⚙️ Compatibility: Meshes with any standard Module 1 (Mod 1) spur gear, rack, or pinion. Bore sizes 6 / 8 / 10 / 12 / 14 / 15 mm — select to match your motor or drive shaft diameter.

✅ Key Features of These Module 1 Spur Gear Pinions

🔩C45 Steel Construction
Medium-carbon steel body delivers solid strength and wear resistance for continuous-duty motor drive applications.

📐True Module 1 Pitch
Machined to standard Mod 1 tooth profile — fully interchangeable with any Mod 1 mating gear, rack, or pinion in your drivetrain.

🎯Stepped Hub Design
Integrated hub step provides a positive axial shoulder for shaft collars, retaining rings, or snap rings, preventing axial migration under load.

📏Wide Tooth & Bore Range
31 to 120 teeth across bore sizes from 6 mm to 15 mm — one product family covers most small-to-medium motor shaft diameters.

⚖️Consistent Dimensional Accuracy
Tooth profile and bore concentricity held to standard gear tolerances, ensuring smooth mesh and minimal backlash in precision drive systems.

🔧Versatile Application Fit
Suited for robotics joints, CNC axis drives, conveyor indexers, and stepper-motor gearboxes where a compact, stepped-hub spur gear is required.

📐 Technical Specifications — Module 1 Spur Gear Pinion

Module (Pitch)	1 (Mod 1)
Material	C45 Medium-Carbon Steel
Tooth Count Range	31 T – 120 T
Bore Diameter Options	6 mm / 8 mm / 10 mm / 12 mm / 14 mm / 15 mm
Hub Style	Stepped hub with shoulder
Pressure Angle	20° (standard)
Pitch Diameter	See variant options (= Module × Tooth Count)
Face Width	See variant options
Surface Finish	See variant options
Keyway	Contact us to confirm
Quantities Available	1 pc / 5 pcs / 10 pcs

❓ Frequently Asked Questions

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

Select the tooth count based on your required gear ratio. Divide the tooth count of the driven gear by the tooth count of this pinion to get the ratio. For example, pairing a 31 T pinion with a 62 T gear gives a 2:1 reduction. Larger tooth counts on the pinion reduce the ratio and increase output speed; smaller tooth counts increase torque reduction.

Which bore size should I choose for my motor shaft?

Match the bore diameter to your motor or drive shaft diameter. Common motor shaft sizes are 6 mm, 8 mm, 10 mm, and 12 mm. If your shaft has a flat (D-shaft), you will typically need to add a set screw or keyway — contact us to confirm keyway availability for your selected bore size.

What does the stepped hub do, and why does it matter?

The stepped hub creates a raised shoulder on one or both sides of the gear body. This shoulder acts as a positive stop for shaft collars, retaining rings, or snap rings, preventing the gear from sliding axially along the shaft under thrust loads. It is especially useful in vertical drive shafts or applications with significant axial force.

Is C45 steel strong enough for my motor drive?

C45 medium-carbon steel (equivalent to AISI 1045) offers a good balance of machinability and mechanical strength, with tensile strength typically in the 570–700 MPa range in the normalized condition. It is well suited for light-to-medium duty motor drive pinions. For very high-torque or high-cycle applications, consider whether a hardened or alloy steel gear would be more appropriate.

Will this gear mesh correctly with my existing Mod 1 rack or gear?

Yes — any gear or rack manufactured to the Module 1 standard with a 20° pressure angle will mesh correctly with this pinion. Module 1 is a metric standard; do not attempt to mesh it with imperial Diametral Pitch (DP) gears, as the tooth profiles are incompatible even if the pitch appears similar.

Do you offer corrosion-resistant or stainless versions?

The standard version is C45 carbon steel, which will surface-rust if exposed to moisture without protection. For corrosion resistance, apply a light machine oil or anti-rust coating after installation. If you require a stainless steel or zinc-plated variant, contact us to confirm availability for your specific tooth count and bore combination.

Can I buy in bulk, and is there a price break for larger quantities?

Yes — each variant is available in packs of 1, 5, or 10 pieces. The per-unit price decreases as quantity increases. Select your preferred quantity from the Quantities option above before adding to cart.

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