Spur Gear Module 2 Stainless Steel with Hub 12 - 30 Tooth Motor Pinion Precision

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Spur Gear Module 2 Stainless Steel with Hub 12 - 30 Tooth Motor Pinion Precision

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By HomeDIYer®

Models: Module 2【12 Tooth】

Bore Size: 8mm

Amount: 1 pcs

Price:

$23.92 USD

Stock:

In stock (500 units), ready to be shipped

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Module 2 Stainless Steel Spur Gear with Hub — Precision Motor Pinion for Demanding Drive Systems

When a loose or undersized pinion causes backlash, slippage, or premature wear in your drive train, the root cause is almost always a gear that wasn't machined to the tolerances your application demands. Engineers, robotics builders, and small-batch manufacturers who need a reliable, drop-in module 2 spur gear with an integrated hub will find this stainless steel motor pinion gear engineered to hold position under load.

Each gear is machined from stainless steel and features an integrated hub for secure shaft mounting. The module 2 tooth profile covers 12 through 30 teeth, with bore sizes ranging from 8 mm (0.31 in) up to 25 mm (0.98 in). Keyway options — 4 mm, 5 mm, 6 mm, and 8 mm — are available on larger bore variants to prevent rotational slip under torque. Overall gear width and hub length vary by tooth count; see variant options for exact dimensions.

Typical use cases include DC motor pinion drives in robotics and automation platforms, CNC axis drive trains requiring repeatable positioning, and small-batch industrial machinery where a stainless steel spur gear with keyway bore resists corrosion in wash-down or humid environments.

⚙️ Compatibility: Module 2 tooth profile. Meshes with any standard Module 2 spur or rack gear. Verify bore diameter and keyway dimensions against your shaft before ordering.

✅ Key Features of These Module 2 Stainless Steel Spur Gears

🔩 Integrated Hub Design

The extended hub provides a longer contact surface for set screws or keyway engagement, reducing shaft wobble and improving torque transfer compared to hubless gears.

🦾 Stainless Steel Construction

Machined from stainless steel for corrosion resistance in humid, wash-down, or outdoor environments — a practical choice over carbon steel where surface rust is a concern.

📐 Module 2 Tooth Profile

Standard Module 2 involute tooth form ensures smooth meshing with any compatible M2 gear or rack, with predictable load distribution across the full tooth face.

🎯 Wide Tooth Count Range (12–30T)

Fifteen tooth-count options from 12 to 30 teeth let you dial in the exact gear ratio needed for your motor pinion or intermediate drive stage without custom machining.

🔑 Keyway Bore Options

Larger bore variants include precision-cut keyways (4 mm, 5 mm, 6 mm, 8 mm) that lock the gear to the shaft under reversing or high-torque loads where a set screw alone is insufficient.

🔄 Multiple Bore Sizes (8–25 mm)

Bore options from 8 mm to 25 mm cover the most common motor and gearbox output shaft diameters, minimizing the need for adapter bushings or custom boring.

📐 Technical Specifications — Module 2 Stainless Steel Spur Gear

Module	2
Tooth Count	12 / 13 / 14 / 15 / 16 / 17 / 18 / 20 / 21 / 22 / 23 / 24 / 25 / 28 / 30
Bore Diameter	8 mm / 10 mm / 12 mm / 14 mm / 15 mm / 16 mm / 17 mm / 18 mm / 19 mm / 20 mm / 22 mm / 24 mm / 25 mm
Keyway Width	4 mm / 5 mm / 6 mm / 8 mm (bore-dependent; see variant options)
Material	Stainless Steel
Tooth Profile	Involute, Module 2
Pressure Angle	20°
Hub	Integrated
Gear Face Width	See variant options
Hub Length	See variant options
Surface Finish	See variant options
Package Quantity	1 pc

❓ Frequently Asked Questions

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

The tooth count determines the pitch circle diameter (PCD = Module × Teeth, so a 20-tooth M2 gear has a 40 mm PCD) and your gear ratio when paired with a mating gear. Choose a smaller tooth count (12–15T) for a compact motor pinion driving a larger driven gear, or a larger tooth count (20–30T) when you need a higher-speed output or a more balanced ratio. Always verify center distance with your mating gear before finalizing.

Do I need a keyway bore, or will a plain bore with a set screw work?

For light-duty or unidirectional loads, a plain bore (8 mm or 10 mm) with a set screw is often sufficient. For reversing loads, high torque, or applications where shaft slip would cause damage, select a keyway bore variant. The keyway mechanically locks the gear to the shaft and distributes torque across a larger contact area than a set screw alone.

Is stainless steel strong enough for my drive application?

Stainless steel offers good tensile strength (typically 515–620 MPa for 304-grade) and excellent corrosion resistance. It is well-suited for moderate-load robotics, automation, and light industrial drives. For very high-torque or impact-load applications, consider whether a hardened alloy steel gear would be more appropriate. Contact us to confirm if you have specific load requirements.

Will this gear mesh with my existing Module 2 rack or spur gear?

Yes — any standard Module 2 involute gear or rack with a 20° pressure angle will mesh correctly with these gears. Module (not pitch) is the governing parameter for metric gears. Do not attempt to mesh with Module 1.5, Module 2.5, or diametral-pitch gears, as the tooth profiles are incompatible.

How do I measure my shaft to select the correct bore size?

Use a digital caliper to measure the shaft outer diameter at the mounting point. Select the bore size that matches your shaft diameter exactly — these gears are machined to close tolerances and are not intended to be bored out further. If your shaft has a keyway, measure the key width and select the matching keyway bore option (e.g., a 5 mm key requires a 5 mm keyway bore variant).

What corrosion resistance can I expect from the stainless steel material?

Stainless steel provides good resistance to atmospheric corrosion, light moisture, and many mild chemicals. It is suitable for humid environments, light wash-down conditions, and outdoor enclosures. For aggressive chemical environments or salt-spray exposure, consider whether additional surface treatment or a higher-grade stainless alloy is required for your specific conditions.

Can I use these gears in a robotics or 3D printer drive system?

Yes. The Module 2 stainless steel spur gear with hub is commonly used as a motor pinion in robotics drive trains, CNC axis drives, and extruder or filament-feed mechanisms where a compact, corrosion-resistant gear is needed. Verify that your motor shaft diameter matches the available bore options and that the gear ratio suits your speed and torque requirements.

🛒 Select your Models and Bore Size above, then add to cart.