Module 5.0 Spur Gear Pinion Gears 45# Steel 10T to 38T Metal Spur Transmission

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Module 5.0 Spur Gear Pinion Gears 45# Steel 10T to 38T Metal Spur Transmission

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By HomeDIYer®

Material: 45# Steel

Modulus: 5 Modulus

Teeth & Amount: 10 Teeth & 1 PCS

Price:

$141.43 USD

Stock:

In stock (500 units), ready to be shipped

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Module 5 Spur Gear Pinion — Precision 45# Steel Drive Component for Demanding Applications

When your mechanical drive system demands consistent torque transfer and dimensional accuracy, a poorly matched gear becomes the weakest link. Engineers, robotics builders, and CNC machine designers who need a reliable module 5 spur gear pinion in a wide tooth-count range will find this 45# steel spur gear series purpose-built for the task. Available from 10 teeth to 38 teeth, this lineup covers the most common reduction ratios used in industrial and maker applications.

Each gear is machined from 45# medium-carbon steel — a material known for its balanced combination of tensile strength and machinability. The module (pitch) is 5.0, meaning the tooth pitch diameter equals 5 × tooth count in millimeters (e.g., a 20-tooth gear has a 100 mm pitch diameter / ~3.94 in). Bore diameter and keyway dimensions vary by tooth count; see variant options for exact bore specs. Face width is typically 20–30 mm (~0.79–1.18 in) depending on the selected variant.

Typical use cases include open-frame CNC router axis drives, robotic arm joint reduction stages, conveyor drive pinion replacements, and custom gearbox prototyping where a module 5 metal spur gear with a broad tooth-count selection is required.

⚙️ Compatible with all standard Module 5.0 spur gears, racks, and mating pinions following DIN 867 / ISO 54 tooth profile standards.

✅ Key Features of These Module 5 Spur Gear Pinions

🔩45# Medium-Carbon Steel Construction — Offers solid mechanical strength and wear resistance suitable for continuous-duty drive applications without being brittle.

📐Module 5.0 Standard Tooth Profile — Conforms to DIN 867 / ISO 54 involute tooth geometry, ensuring smooth meshing with any compatible module 5 rack or gear.

🔢Wide Tooth-Count Range: 10T to 38T — Select the exact pinion size you need for your target gear ratio without custom machining or compromise.

🎯Machined Bore & Keyway — Each gear features a precision-bored center hole sized for standard shaft diameters; keyway slot included for positive torque transmission. See variant options for bore dimensions.

🛡️Corrosion-Resistant Surface Treatment — Blackened or lightly oiled finish helps protect against surface oxidation during storage and operation in low-humidity environments.

🔄Drop-In Replacement Geometry — Standard module 5 pitch makes these pinions interchangeable with existing module 5 gear trains, simplifying maintenance and upgrades.

📐 Technical Specifications — Module 5 Spur Gear Pinion

Module (Pitch)	5.0
Tooth Count Range	10T – 38T (select variant)
Material	45# Medium-Carbon Steel
Tooth Profile	Involute, DIN 867 / ISO 54
Pressure Angle	20°
Pitch Diameter	Module × Teeth (e.g., 5 × 20T = 100 mm / 3.94 in)
Face Width	Typically 20–30 mm (0.79–1.18 in) — See variant options
Bore Diameter	See variant options
Keyway	Included — dimensions per variant
Surface Finish	Blackened / lightly oiled
Quantity per Order	1 PCS

❓ Frequently Asked Questions

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

The tooth count determines your gear ratio when paired with a mating gear. Divide the driven gear's tooth count by the pinion's tooth count to get the reduction ratio. For example, a 10-tooth pinion driving a 30-tooth gear gives a 3:1 reduction. Choose a lower tooth count for higher speed reduction and more torque multiplication, or a higher tooth count for a closer 1:1 ratio.

What shaft diameter does this gear fit?

Bore diameter varies by tooth count variant. Please refer to the variant options on this page or contact us to confirm the bore size for your selected tooth count before ordering. The keyway slot is included on all variants for positive shaft engagement.

Is 45# steel strong enough for my drive system?

45# medium-carbon steel provides a tensile strength of approximately 600–800 MPa depending on heat treatment, making it well-suited for moderate-to-heavy duty open gear drives, robotics joints, and CNC axis applications. For extremely high-shock or high-speed applications, consider whether a hardened or alloy steel variant would better suit your load requirements.

Will this gear rust or corrode?

The blackened and lightly oiled surface finish provides basic protection against surface oxidation during storage and in dry operating environments. For outdoor, high-humidity, or washdown environments, we recommend applying a compatible gear lubricant or grease regularly to maintain the tooth surface and prevent corrosion.

Is this gear compatible with module 5 racks and other module 5 gears?

Yes. All gears in this series follow the standard module 5.0 involute tooth profile (DIN 867 / ISO 54) with a 20° pressure angle. They will mesh correctly with any other module 5 spur gear, pinion, or rack that conforms to the same standard, regardless of brand or manufacturer.

Can I use this gear in a gearbox or enclosed drive?

Yes, module 5 spur gears are commonly used in both open-frame and enclosed gearbox configurations. Ensure adequate lubrication (grease or oil bath as appropriate) and that the housing provides sufficient clearance for the gear's outer diameter (tip diameter = module × (teeth + 2)). For enclosed drives, verify shaft center distance matches your gear pair's pitch diameter sum divided by 2.

How do I calculate the center distance between two meshing module 5 gears?

Center distance = (Pitch Diameter of Gear 1 + Pitch Diameter of Gear 2) / 2. Since pitch diameter = module × teeth, for a 10-tooth pinion and a 30-tooth gear: center distance = (5×10 + 5×30) / 2 = (50 + 150) / 2 = 100 mm. This is the theoretical center distance; allow for standard backlash in your design.

🛒 Select your tooth count (10T–38T) above, then add to cart.