Spur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor Gear
Spur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor Gear
Spur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor Gear
Spur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor Gear
Spur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor Gear
Spur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor Gear
Spur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor Gear
Spur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor Gear
Spur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor Gear
Spur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor Gear
Spur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor Gear
Spur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor Gear
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Spur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor GearSpur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor GearSpur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor GearSpur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor GearSpur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor GearSpur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor GearSpur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor GearSpur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor GearSpur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor GearSpur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor GearSpur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor GearSpur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor Gear

Spur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor Gear

HomeDIYer
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By HomeDIYer®

Price:
$7.93 USD
Stock:
In stock (500 units), ready to be shipped

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Description

Spur Gear 45# Steel — Reliable 2 Module Pinion Gear for Motor Drive Applications

When a slipping or undersized gear brings your build to a halt, you need a replacement that fits precisely and holds up under load. These 45# carbon steel spur gears are designed for makers, robotics builders, CNC hobbyists, and small-machine engineers who demand consistent mesh accuracy and long service life from their motion-control components.

Each gear is machined from 45# medium-carbon steel and follows a standard 2-module tooth profile. The range covers 10 to 40 teeth, with corresponding outside diameters from 24 mm (0.94 in) to 84 mm (3.31 in). Bore diameter and keyway dimensions vary by tooth count — see variant options for exact bore specs. Available in packs of 1, 2, or 3 pieces to suit prototyping or small-batch production needs.

Typical use cases include DC motor pinion drives in tabletop CNC routers, gear-reduction stages in DIY robotic arms, and speed-ratio adjustments in custom conveyor or actuator assemblies. Long-tail search terms such as "2 mod steel spur gear 20 teeth", "45 steel pinion gear CNC", and "metric module 2 transmission gear" all describe this product family.

⚙️ Compatibility: Fits any mating gear or rack with Module 2 (Mod 2) tooth profile. Verify bore diameter and keyway against your shaft before ordering — see variant options for bore details.

✅ Key Features of These 45# Steel Spur Gears

🔩 45# Carbon Steel Construction

Medium-carbon steel provides a solid balance of machinability and wear resistance, suitable for moderate-load gear drives without the cost of alloy steel.

📐 Standard Module 2 Tooth Profile

Conforms to the metric Module 2 standard, ensuring accurate mesh with any compatible Mod 2 gear, rack, or pinion in your drivetrain.

🎯 Wide Tooth-Count Selection (10T–40T)

Thirty-one tooth-count options from 10T to 40T let you dial in the exact gear ratio your application requires without custom machining.

📦 Flexible Pack Quantities

Order 1, 2, or 3 pieces per SKU — ideal for single-prototype builds, redundancy spares, or small-batch production runs.

🔄 Consistent OD-to-Tooth Relationship

Outside diameter scales predictably with tooth count (OD = (Z + 2) × module), making gear-ratio calculations and housing design straightforward.

🛠️ Drop-In Replacement for Mod 2 Drives

Dimensionally interchangeable with other Mod 2 spur gears, so you can swap worn gears in existing assemblies without redesigning the gear housing.

📐 Technical Specifications — Spur Gear

Material 45# Medium-Carbon Steel
Module 2 (Metric)
Tooth Count Range 10T – 40T
Outside Diameter Range 24 mm – 84 mm (0.94 in – 3.31 in)
Pressure Angle 20°
Bore Diameter See variant options
Hub / Face Width See variant options
Surface Finish See variant options
Weight (per piece) See variant options
Pack Quantity 1 Pcs / 2 Pcs / 3 Pcs

❓ Frequently Asked Questions

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

Gear ratio equals the driven gear's tooth count divided by the driving gear's tooth count. For example, pairing a 10T pinion with a 30T gear gives a 3:1 reduction. Select the tooth count that achieves your target speed or torque ratio. Outside diameter scales as OD = (Z + 2) × 2 mm, so a 20T gear has an OD of 44 mm.

What load capacity can these gears handle?

45# carbon steel offers moderate tensile strength (typically 600–800 MPa after heat treatment). These gears are suited for light-to-medium duty drives such as robotics, small CNC machines, and hobby automation. For heavy industrial loads or continuous high-torque applications, consider alloy steel or hardened gears.

Are these gears corrosion-resistant?

45# steel has limited inherent corrosion resistance. For outdoor or humid environments, apply a light machine oil or grease after installation. If corrosion resistance is critical, consider stainless steel or nylon gears instead.

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

Yes — any gear or rack with a Module 2 (Mod 2) tooth profile and a 20° pressure angle will mesh correctly with these gears. Confirm the module and pressure angle of your existing components before ordering. Imperial DP gears are not compatible.

How do I verify the bore fits my motor shaft?

Bore diameter varies by tooth count and is listed in the variant details. Measure your motor shaft diameter with calipers before selecting a variant. If the standard bore is too small, the gear can typically be bored out by a machine shop to your required diameter.

Can I use these gears without lubrication?

Short-term dry operation is possible at low speeds and light loads, but lubrication significantly extends gear life. Apply a thin film of grease (e.g., lithium-based or molybdenum disulfide grease) to the tooth flanks during assembly and re-lubricate periodically based on duty cycle.

What is the difference between the 1 Pcs, 2 Pcs, and 3 Pcs pack options?

All three pack options contain identical gears of the same tooth count and outside diameter. The pack quantity simply determines how many pieces you receive per order. The 2 Pcs and 3 Pcs options offer a lower per-piece cost and are convenient when you need spares or are building multiple identical assemblies.

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

 

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