0.5M 26T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel

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0.5M 26T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel

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Teeth - Bore(mm): 26T-4mm

Qty(pcs): 1

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$3.96 USD

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In stock (500 units), ready to be shipped

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0.5M 26T Steel Spur Gear — Precision Pinion for Compact Drive Systems

When a stripped or undersized gear brings your build to a halt, you need a replacement that fits exactly and holds up under load. These 0.5 module 26-tooth steel spur gears are designed for engineers, robotics builders, and RC hobbyists who require consistent tooth geometry and reliable torque transmission in tight spaces.

Each gear is machined from 45 steel — a medium-carbon steel known for its balanced hardness and toughness — and features a module of 0.5M with 26 teeth. Bore options are 4 mm (approximately 0.157 in) and 5 mm (approximately 0.197 in), with an outer diameter typically around 13.5 mm (approximately 0.53 in). The compact form factor suits applications where space is at a premium.

Typical use cases include small-scale robotics joint drives, RC car transmission stages, and precision instrument gear trains. Whether you are prototyping a 0.5M gear reduction stage or restocking a production line with 26T pinion gears, these gears are available in quantities from 1 to 50 pieces per order.

⚙️ Compatible with all standard 0.5 module (0.5M) gear systems. Mates with any 0.5M rack, spur, or helical gear of matching module.

✅ Key Features of These 0.5M 26T Steel Spur Gears

🔩45 Steel Construction

Medium-carbon 45 steel delivers a strong balance of hardness and impact resistance, suitable for continuous-duty gear mesh applications.

📐0.5 Module, 26 Teeth

Standard 0.5M tooth profile ensures accurate mesh with any compatible 0.5M gear, rack, or pinion in your drivetrain.

🎯Dual Bore Options

Available with a 4 mm or 5 mm bore to match common motor shaft diameters used in robotics and RC applications.

📦Flexible Quantity Packs

Order from 1 to 50 pieces per SKU — ideal for prototyping single units or stocking spare parts for production runs.

🔄Consistent Tooth Geometry

Machined to standard involute tooth form for smooth, low-noise gear engagement and predictable transmission ratios.

🛠️Broad Application Fit

Suited for robotics joints, RC car gearboxes, small automation drives, and precision instrument mechanisms requiring compact 0.5M gearing.

📐 Technical Specifications — 0.5M Spur Gear

Module	0.5M
Number of Teeth	26T
Material	45 Steel (medium-carbon)
Bore Diameter	4 mm / 5 mm (see variant options)
Outer Diameter (OD)	Typically ~13.5 mm (~0.53 in)
Pressure Angle	20°
Tooth Profile	Standard involute
Finish	See variant options
Available Quantities	1 / 3 / 5 / 10 / 15 / 20 / 30 / 50 pcs

❓ Frequently Asked Questions

How do I choose between the 4 mm and 5 mm bore?

Measure your motor or shaft output diameter with a caliper before ordering. The 4 mm bore fits common micro-motor shafts used in small robotics, while the 5 mm bore suits slightly larger DC motors and RC car pinion applications. If your shaft is between sizes, a 5 mm bore with a set screw or loctite sleeve is typically easier to adapt than boring out a 4 mm gear.

What is the outer diameter of this 26-tooth 0.5M gear?

For a 0.5 module gear, the theoretical outer diameter (OD) is calculated as (Teeth + 2) × Module = (26 + 2) × 0.5 = 14 mm. Actual machined OD may be approximately 13.5–14 mm depending on manufacturing tolerances. Confirm with your caliper after receipt if tight clearances are required.

Is 45 steel strong enough for my application?

45 steel is a medium-carbon steel with tensile strength typically in the range of 600–800 MPa, making it well-suited for moderate-load gear applications such as robotics joints, RC drivetrains, and small automation stages. For very high-torque or high-speed applications, consider whether a hardened or alloy steel gear would be more appropriate for your load case.

Will this gear corrode if used outdoors or in humid environments?

45 steel is not inherently corrosion-resistant. For outdoor or humid environments, apply a light machine oil or grease to the gear teeth and bore after installation. If long-term corrosion resistance is critical, consider a stainless steel or zinc-plated alternative, or apply a protective coating after installation.

Can I use this gear with a 0.5M rack or helical gear?

Yes. This gear follows the standard 0.5 module involute tooth profile with a 20° pressure angle, which is compatible with any 0.5M rack, spur gear, or helical gear of the same module and pressure angle. Always verify the mating gear's module and pressure angle before assembly to ensure proper mesh.

How many pieces should I order for a prototype vs. a production run?

For initial prototyping, a quantity of 1 or 3 pieces is sufficient to validate fit and function. For small production runs or to maintain a spare parts inventory, quantities of 10–30 pieces offer a better per-unit cost. The 50-piece pack is best suited for higher-volume assembly or bulk stocking needs.

What is the pressure angle of this spur gear?

This gear uses the standard 20° pressure angle, which is the most common standard for metric module spur gears. This ensures compatibility with the widest range of 0.5M mating gears available on the market.

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