Steel Spur Gear 1,1.5,2 Mod 12T-150T Teeth Metal Pinion Gear 14-258mm Outer Dia

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Steel Spur Gear 1,1.5,2 Mod 12T-150T Teeth Metal Pinion Gear 14-258mm Outer Dia

HomeDIYer

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By HomeDIYer®

Mod: 1 Modul

Teeth: 12 Teeth

QTY(pcs): 1 pcs

Price:

$4.34 USD

Stock:

In stock (500 units), ready to be shipped

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Steel Spur Gear — Precision Metal Pinion Gears for Reliable DIY Power Transmission

When your automation project demands consistent torque transfer and zero slippage, finding a spur gear that matches your exact module and tooth count can be a real bottleneck. These steel spur gears are engineered for makers, hobbyists, small workshop builders, and CNC enthusiasts who need a dependable metal pinion gear without sourcing custom parts. Available in Module 1, 1.5, and 2, with tooth counts spanning 12T to 150T, this range covers the vast majority of standard gear-drive applications.

Each gear is machined from carbon steel, delivering the hardness and wear resistance needed for continuous-duty motion systems. The outer diameter ranges from approximately 14 mm (0.55 in) for the smallest 12T/Mod 1 gear up to approximately 258 mm (10.16 in) for the largest 150T/Mod 2 gear, with bore and face width varying by module — see variant options for exact per-SKU dimensions. The tooth profile follows standard involute geometry, ensuring smooth meshing with any mating gear of the same module.

Typical use cases include DIY conveyor belt drives and timing systems, 3D printer extruder and axis gear trains, robotic arm joint reduction stages, and small CNC router spindle or feed-axis drives. Whether you are building a compact Mod 1 gear train for a desktop robot or a heavy-duty Mod 2 reduction stage for a workshop automation rig, this selection gives you the tooth count and module you need in a single order.

⚙️ Compatibility: Meshes with any standard involute spur gear of the same module (Mod 1, 1.5, or 2). Verify bore diameter and face width against your shaft and housing before ordering — see variant options for per-SKU details.

✅ Key Features of These Steel Spur Gears

🔩

Three Module Options

Available in Mod 1, Mod 1.5, and Mod 2 to match standard gear-drive designs across a wide range of torque and speed requirements.

🦷

Wide Tooth Count Range

12T through 150T in a single product family, letting you dial in your exact gear ratio without sourcing from multiple suppliers.

⚡

Carbon Steel Construction

Machined from carbon steel for the hardness, tensile strength, and wear resistance required in continuous-duty power transmission applications.

📐

Standard Involute Tooth Profile

Follows DIN/ISO involute geometry, ensuring smooth, low-noise meshing with any mating gear of the same module and pressure angle.

🔄

Broad Outer Diameter Coverage

OD spans approximately 14 mm to 258 mm (0.55 in to 10.16 in), covering compact desktop robots up to full-scale workshop automation rigs.

🛠️

Drop-In Replacement Ready

Standard module sizing means these gears can replace worn or broken pinion gears in existing machines without custom machining.

📐 Technical Specifications — Steel Spur Gears

Material	Carbon Steel
Tooth Profile	Standard Involute (20° Pressure Angle)
Available Modules	Mod 1 / Mod 1.5 / Mod 2
Tooth Count Range	12T – 150T
Outer Diameter Range	Approx. 14 mm – 258 mm (0.55 in – 10.16 in)
Bore Diameter	See variant options
Face Width	See variant options
Hub Diameter	See variant options
Surface Finish	See variant options
Quantity per Order	1 pc (default); multi-pack options available

❓ Frequently Asked Questions

How do I choose the right module for my project?

The module (Mod) defines the tooth size and must match between meshing gears. Mod 1 is the smallest tooth size in this range — suited for light-load, high-speed applications such as desktop robots and 3D printers. Mod 1.5 is a mid-range option for moderate torque. Mod 2 has larger teeth and is better for higher-torque, lower-speed drives such as CNC feed axes or workshop conveyors. Both mating gears must share the same module.

How do I calculate the gear ratio I need?

Gear ratio = driven gear tooth count ÷ driving gear tooth count. For example, pairing a 20T pinion with a 60T gear gives a 3:1 reduction. Use the tooth count range (12T–150T) in this listing to build ratios from roughly 1:1 up to 12.5:1 in a single stage, or stack stages for higher reductions.

Are these gears strong enough for continuous-duty use?

Yes. The gears are machined from carbon steel, which provides the hardness and tensile strength needed for sustained operation in automation, robotics, and light industrial drives. For very high shock loads or corrosive environments, contact us to confirm suitability for your specific application.

Will these gears rust or corrode?

Carbon steel can oxidize if exposed to moisture without protection. For indoor, dry environments this is generally not a concern with normal use. If your application involves humidity, coolant splash, or outdoor exposure, consider applying a light machine oil or grease to the gear teeth and bore, or contact us to discuss surface-treated options.

How do I confirm the bore diameter fits my shaft?

Bore diameter varies by module and tooth count. Please check the variant options or contact us with your shaft diameter before ordering. Most standard bores in this range are sized for common metric shaft diameters, but we recommend confirming the exact bore spec for your selected variant to avoid a mismatch.

Can I use a Mod 1 gear with a Mod 1.5 or Mod 2 gear?

No. Gears of different modules cannot mesh correctly — the tooth pitch and size are incompatible. Always pair gears of the same module. If you need to connect shafts with different speed ratios, use a gear train where all meshing pairs share the same module.

What is the outer diameter for a specific tooth count and module?

Outer diameter (OD) for a spur gear = (Tooth Count + 2) × Module. For example, a 20T Mod 1 gear has OD = (20+2) × 1 = 22 mm. A 50T Mod 2 gear has OD = (50+2) × 2 = 104 mm. The listing covers ODs from approximately 14 mm (12T/Mod 1) to 258 mm (128T/Mod 2 equivalent). Use this formula to verify fit in your housing before ordering.

🛒 Select your Mod and Teeth count above, then add to cart.