Spur Gear 45# Carbon Steel Transmission Gear 1.25 Mod 10-60T Pinion Motor Gear
Spur Gear 45# Carbon Steel Transmission Gear 1.25 Mod 10-60T Pinion Motor Gear
Spur Gear 45# Carbon Steel Transmission Gear 1.25 Mod 10-60T Pinion Motor Gear
Spur Gear 45# Carbon Steel Transmission Gear 1.25 Mod 10-60T Pinion Motor Gear
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Spur Gear 45# Carbon Steel Transmission Gear 1.25 Mod 10-60T Pinion Motor GearSpur Gear 45# Carbon Steel Transmission Gear 1.25 Mod 10-60T Pinion Motor GearSpur Gear 45# Carbon Steel Transmission Gear 1.25 Mod 10-60T Pinion Motor GearSpur Gear 45# Carbon Steel Transmission Gear 1.25 Mod 10-60T Pinion Motor Gear

Spur Gear 45# Carbon Steel Transmission Gear 1.25 Mod 10-60T Pinion Motor Gear

HomeDIYer
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By HomeDIYer®

Price:
$4.20 USD
Stock:
In stock (500 units), ready to be shipped

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Description

1.25 Mod Spur Gear — 45# Carbon Steel Pinion Motor Gear for Reliable DIY Power Transmission

When a slipping or undersized gear brings your build to a halt, you need a replacement that holds up under real load. Whether you're a robotics hobbyist, a CNC builder, or a maker running a custom automation rig, finding a spur gear with consistent tooth geometry and durable material is the difference between a project that runs and one that grinds. These 1.25 Mod spur gears are machined for makers who can't afford sloppy tolerances.

Each gear is machined from 45# carbon steel — a medium-carbon structural steel known for its balance of hardness and machinability. The module is 1.25 (metric pitch), with tooth counts ranging from 10T to 60T. Corresponding pitch circle diameters range from approximately 12.5 mm (0.49 in) for the 10T up to 75 mm (2.95 in) for the 60T. Bore diameter and keyway dimensions vary by tooth count — see variant options for exact bore specs.

These pinion motor gears are well-suited for small DC motor drives in robotics platforms, stepper motor output stages in CNC router builds, and gear reduction assemblies in DIY conveyor or actuator projects. The 1.25 mod standard makes them interchangeable with other metric 1.25 mod gears across your drivetrain.

⚙️ Compatibility: Meshes with any standard metric Module 1.25 spur gear or rack. Suitable for motor shafts — confirm bore diameter against your motor shaft before ordering.

✅ Key Features of These 1.25 Mod Carbon Steel Spur Gears

  • 🔩 45# Carbon Steel Construction — Medium-carbon steel delivers solid hardness and wear resistance for sustained gear mesh under moderate-to-high torque loads.
  • 📐 Metric Module 1.25 Standard — Fully interchangeable with any other M1.25 spur gear or rack, making integration into existing drivetrains straightforward.
  • 🎯 Wide Tooth Count Range (10T–60T) — 51 variants covering 10 to 60 teeth let you dial in the exact gear ratio your motor drive or reduction stage requires.
  • 🏭 CNC-Machined Tooth Profile — Involute tooth geometry is cut to consistent tolerances, ensuring smooth mesh engagement and reduced backlash in precision motion applications.
  • 🔄 Pinion Motor Gear Ready — Compact tooth counts (10T–20T) are sized for direct mounting on small motor shafts in robotics, RC, and automation builds.
  • 🛠️ Broad Application Fit — Used in CNC router Z-axis drives, robotic arm joints, conveyor reduction stages, and custom DIY gearbox assemblies requiring metric 1.25 mod gearing.

📐 Technical Specifications — 1.25 Mod Spur Gear

Module 1.25 (Metric)
Tooth Count 10T – 60T (see variant options)
Material 45# Carbon Steel
Tooth Profile Involute
Pressure Angle 20°
Pitch Circle Diameter 12.5 mm – 75 mm (0.49 in – 2.95 in), varies by tooth count
Bore Diameter See variant options
Hub / Face Width See variant options
Surface Finish See variant options
Quantity per Order 1 piece

❓ Frequently Asked Questions

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

Your gear ratio is determined by dividing the driven gear tooth count by the driving (pinion) gear tooth count. For example, pairing a 10T pinion with a 40T driven gear gives a 4:1 reduction. Start with your required output speed and torque, then work backward from your motor's RPM and torque rating to select the appropriate tooth count combination.

What is Module 1.25 and will it mesh with my existing gears?

Module (Mod) is the metric standard for gear tooth size — it equals the pitch circle diameter divided by the number of teeth. Two gears mesh correctly only when they share the same module and pressure angle. These gears are Module 1.25 with a 20° pressure angle. They will mesh with any other M1.25 / 20° spur gear or rack, regardless of brand, as long as the module matches.

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

45# carbon steel has a tensile strength typically in the range of 600–750 MPa, making it suitable for moderate-to-high torque applications in robotics, CNC, and light industrial automation. For very high shock loads or continuous heavy-duty industrial use, consider hardened or alloy steel gears. For most DIY and maker applications these gears are more than adequate.

Are these gears corrosion resistant?

45# carbon steel is not inherently corrosion resistant. For indoor or dry environments this is generally not a concern. If your application involves moisture, humidity, or outdoor exposure, we recommend applying a light machine oil or grease to the gear teeth and bore, or consider a stainless steel alternative for corrosive environments.

How do I confirm the bore diameter fits my motor shaft?

Measure your motor shaft diameter with a caliper before ordering. The bore diameter for each tooth count variant is listed in the variant options. If your shaft diameter falls between standard bore sizes, the bore can typically be enlarged by a machinist. Do not force a gear onto an oversized shaft as this can crack the hub.

Can I use these as pinion gears directly on a motor shaft?

Yes — the smaller tooth count variants (10T through approximately 20T) are commonly used as pinion gears mounted directly on motor output shafts. Ensure the bore diameter matches your motor shaft and use a set screw or keyway (where available) to secure the gear. For higher tooth counts used as driven gears, standard shaft and hub mounting applies.

What is the difference between the 10T and 60T variants in terms of physical size?

The pitch circle diameter scales linearly with tooth count at Module 1.25: the 10T gear has a pitch circle diameter of 12.5 mm (0.49 in), while the 60T gear has a pitch circle diameter of 75 mm (2.95 in). Outside diameter will be slightly larger than the pitch circle diameter in each case. Select the tooth count that fits within your gearbox envelope while achieving your target ratio.

🛒 Select your tooth count (Model) above, then add to cart.

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