0.5 Mod 44T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel
0.5 Mod 44T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel
0.5 Mod 44T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel
0.5 Mod 44T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel
0.5 Mod 44T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel
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0.5 Mod 44T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel0.5 Mod 44T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel0.5 Mod 44T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel0.5 Mod 44T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel0.5 Mod 44T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel

0.5 Mod 44T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel

HomeDIYer
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By HomeDIYer®

Price:
$4.87 USD
Stock:
In stock (500 units), ready to be shipped

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Description

0.5 Mod Steel Spur Gears — Precision Pinion Gears for Compact Drive Systems

When your RC car, robotic arm, or DIY gearbox demands tight tolerances and reliable torque transfer, undersized or plastic gears become the weakest link in the chain. Makers, hobbyists, and small-shop engineers who need repeatable, metal-on-metal mesh in confined spaces rely on module 0.5 spur gears that hold their geometry under load.

These 0.5 Mod spur gears are machined from 45 steel — a medium-carbon steel known for its balance of hardness and machinability. Available in 44-tooth (44T) and 42-tooth (42T) configurations with bore diameters of 6 mm (~0.236 in), 8 mm (~0.315 in), and 10 mm (~0.394 in), the gears suit shafts in the most common small-motor and servo ranges. Outer diameter for 44T is approximately 23 mm (~0.906 in); for 42T approximately 22 mm (~0.866 in), based on standard 0.5 module geometry.

Typical use cases include RC vehicle transmission rebuilds requiring a 0.5 mod pinion gear replacement, desktop robotic arm joint drives needing a compact metal spur gear set, and DIY encoder or stepper-motor gearbox projects where a 45-steel transmission gear ensures long service life.

⚙️ Compatibility: Designed for Module 0.5 (Mod 0.5) gear systems. Mates with any standard 0.5 module rack, pinion, or mating spur gear. Verify bore diameter matches your shaft before ordering.

✅ Key Features of These 0.5 Mod Steel Spur Gears

🔩 45 Steel Construction

Medium-carbon 45 steel delivers a tensile strength of approximately 600–800 MPa, resisting deformation under repeated meshing loads far better than plastic or zinc-alloy alternatives.

📐 Standard 0.5 Module Geometry

Machined to Module 0.5 (m = 0.5 mm) with a 20° pressure angle, ensuring drop-in compatibility with any standard Mod 0.5 mating gear, rack, or pinion in your drivetrain.

🎯 Multiple Bore Options

Choose from 6 mm, 8 mm, or 10 mm bore diameters to match your motor shaft or output shaft without secondary machining in most common small-drive applications.

⚡ Low Backlash Tooth Profile

Involute tooth form with consistent pitch circle diameter minimizes backlash and noise, critical for position-sensitive robotics and servo-driven mechanisms.

📦 Flexible Quantity Packs

Order 1 to 50 pieces per SKU — ideal for prototyping single units or stocking spares for production runs, with per-unit cost decreasing at higher quantities.

🔧 Ready-to-Install Design

Finished bore and face require no additional turning for standard shaft fits. Simply press or key onto your shaft and mesh with a compatible 0.5 mod counterpart.

📐 Technical Specifications — 0.5 Mod Spur Gears

Module 0.5 mm
Pressure Angle 20°
Tooth Count 44T or 42T (see variant options)
Bore Diameter 6 mm / 8 mm / 10 mm (see variant options)
Outer Diameter (44T) ~23 mm (~0.906 in)
Outer Diameter (42T) ~22 mm (~0.866 in)
Face Width See variant options
Material 45 Steel (medium-carbon steel)
Finish See variant options
Gear Type External spur gear
Tooth Form Involute
Pack Quantity 1 / 5 / 10 / 15 / 20 / 30 / 40 / 50 pcs

❓ Frequently Asked Questions

How do I choose between 44T and 42T?

The tooth count determines your gear ratio. A 44T gear paired with a smaller pinion gives a higher reduction ratio than a 42T in the same pairing. If you need a slightly faster output speed, choose 42T; for more torque reduction, choose 44T. Both are Module 0.5, so they mesh with the same mating gears.

Which bore size should I select for my motor shaft?

Measure your motor or servo output shaft diameter precisely. Choose 6 mm bore for shafts up to 6 mm, 8 mm for shafts up to 8 mm, and 10 mm for shafts up to 10 mm. If your shaft is slightly undersized, a set screw or key can secure the gear. Contact us to confirm if you are unsure.

Are these gears compatible with plastic 0.5 mod gears?

Yes — Module 0.5 is a standardized metric gear specification. These steel spur gears will mesh correctly with any mating gear (plastic, brass, or steel) that is also Module 0.5 with a 20° pressure angle. However, pairing steel with soft plastic may accelerate wear on the plastic gear over time.

How strong are 45 steel spur gears compared to brass or aluminum?

45 steel has a tensile strength of approximately 600–800 MPa, significantly higher than brass (~350–500 MPa) and aluminum alloys (~200–400 MPa). For high-cycle or high-torque applications — such as RC drivetrains or robotic joints — 45 steel provides superior fatigue resistance and longer service life.

Do these gears resist corrosion?

45 steel has moderate corrosion resistance. For indoor or dry environments, the gears perform well without additional treatment. For humid or outdoor applications, applying a light machine oil or grease to the tooth faces will protect against surface oxidation and extend service life.

Can I order a mix of tooth counts and bore sizes in one order?

Each variant (Teeth–Bore combination) is listed separately. Add each variant you need to your cart individually and select the desired quantity pack for each. This lets you build a custom assortment of 44T-6mm, 44T-8mm, and 42T-10mm gears in a single order.

What quantity pack is most cost-effective for prototyping?

For initial prototyping, the 1-piece or 5-piece pack lets you validate fit and mesh before committing to larger quantities. Once your design is confirmed, the 20–50 piece packs offer a lower per-unit cost and ensure you have spares on hand for production or repair runs.

🛒 Select your Teeth–Bore combination and quantity above, then add to cart.

 

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