Spur Gears 1 Mod Transmission Gear With Step 45# Steel Pinion Motor Gear 30T~44T

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Spur Gears 1 Mod Transmission Gear With Step 45# Steel Pinion Motor Gear 30T~44T

Name: Spur Gears 1 Mod Transmission Gear With Step 45# Steel Pinion Motor Gear 30T~44T
Brand: HomeDIYer
Price: 13.95 USD
Availability: InStock

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By HomeDIYer®

Size: 1M 30T/Bore 4mm

Price:

$13.95 USD

Stock:

In stock (500 units), ready to be shipped

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1 Mod Spur Gears 30T–44T — Precision 45# Steel Pinion for Reliable DIY Power Transmission

When a slipping or mismatched gear brings your automation project to a halt, you need a replacement you can trust to fit right and run true. These 1 Module spur gears are designed for makers, robotics builders, and small-machine engineers who need a consistent, measurable tooth profile across a wide tooth-count range — from compact 30T pinions up to larger 44T drive gears.

Each gear is machined from 45# medium-carbon steel, offering a solid balance of hardness and machinability. The tooth profile follows the standard 1M (module 1, pitch = 3.14 mm / ~0.124 in) specification. Bore options span from 4 mm (~0.16 in) up to 25 mm (~0.98 in), with round bores, D-bores, and keyway bores (3×1.4 mm, 4×1.8 mm, 5×2.3 mm, 6×2.8 mm) available depending on tooth count. Step variants include hub steps of 25 mm, 28 mm, 30 mm, 35 mm, and 38 mm for shaft-shoulder positioning.

Typical use cases include DC motor pinion replacement in 3D printers and CNC routers, gear-ratio stages in DIY gearboxes and conveyor drives, and educational robotics platforms requiring interchangeable 1M metric gears. The wide bore and tooth-count selection makes these gears a go-to for custom 1 mod spur gear transmission builds.

⚙️ Compatibility: Fits any 1 Module (1M) gear system. Mates with 1M racks, worm gears, and other 1M spur gears. Verify bore diameter and keyway dimensions against your shaft before ordering.

✅ Key Features of These 1 Mod Spur Gears

🔩 45# Steel Construction

Medium-carbon steel delivers the hardness needed for sustained mesh loads while remaining machinable for custom bore modifications if required.

📐 Standard 1M Tooth Profile

Module 1 specification (circular pitch ≈ 3.14 mm) ensures direct interchangeability with any other 1M metric gear in your drivetrain.

🎯 Wide Tooth Count Range: 30T–44T

Select from 30 through 44 teeth to dial in your gear ratio without sourcing from multiple suppliers or compromising on center distance.

🔄 Multiple Bore Styles

Round bore, D-bore, and keyway bore (3×1.4 mm / 4×1.8 mm / 5×2.3 mm / 6×2.8 mm) options let you match the gear to your shaft type without custom machining.

📏 Step Hub Variants Available

Step hub options (25 mm, 28 mm, 30 mm, 35 mm, 38 mm) provide a shoulder reference for precise axial positioning on the shaft.

🛠️ Drop-In Replacement Ready

Consistent machining tolerances across the range mean these gears seat cleanly on standard metric shafts and align correctly with mating 1M gears out of the box.

📐 Technical Specifications — 1 Mod Spur Gears

Module	1M (Metric Module 1)
Tooth Count Range	30T – 44T
Material	45# Medium-Carbon Steel
Bore Type	Round bore, D-bore, Keyway bore
Bore Diameter Range	4 mm – 25 mm (see variant options)
Keyway Options	3×1.4 mm, 4×1.8 mm, 5×2.3 mm, 6×2.8 mm (see variant options)
Step Hub Sizes	25 mm, 28 mm, 30 mm, 35 mm, 38 mm (see variant options)
Circular Pitch	≈ 3.14 mm (~0.124 in)
Pressure Angle	20° (standard)
Finish	See variant options
Quantity per Order	1 piece

❓ Frequently Asked Questions

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

Tooth count determines your gear ratio. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For example, pairing a 30T pinion with a 40T gear gives a 1.33:1 reduction. Choose a tooth count that achieves your target speed or torque ratio while keeping center distance practical for your frame.

What bore type should I select — round, D-bore, or keyway?

Round bore suits shafts secured with a set screw or press fit. D-bore (flat on one side) provides positive rotational drive without a key, ideal for lighter loads. Keyway bores (3×1.4 mm through 6×2.8 mm) are best for higher-torque applications where the key transmits load rather than relying on friction alone. Match the bore style to your shaft's existing feature.

Are these gears compatible with other 1M metric gears I already have?

Yes. Any gear marked "Module 1" or "1M" with a 20° pressure angle will mesh correctly with these gears. The center distance between two meshing 1M gears equals half the sum of their tooth counts in millimeters (e.g., 30T + 40T = 35 mm center distance).

How strong are 45# steel gears for my load?

45# steel (roughly equivalent to AISI 1045) has a tensile strength typically in the 600–800 MPa range in its normalized state. For light-to-medium duty applications — small motors, 3D printer drives, conveyor stages, and educational robotics — this material provides adequate strength. For heavy shock loads or continuous high-torque industrial use, consider hardened or alloy steel alternatives.

Do these gears resist corrosion?

Carbon steel is not inherently corrosion-resistant. For indoor, dry environments these gears perform well with light lubrication. If your application involves moisture, humidity, or outdoor exposure, apply a rust-inhibiting grease or consider a stainless steel alternative. Regular lubrication also extends gear life and reduces noise.

What is a "step" bore variant and when do I need it?

A step hub has a raised cylindrical shoulder on the gear face. This shoulder butts against a shaft shoulder or bearing face, providing a precise axial stop without needing a separate collar or spacer. Step variants are listed with their hub diameter and step length (e.g., "Bore 14mm/Step 28mm"). Choose a step variant when your assembly requires a fixed axial position for the gear.

Can I modify the bore diameter myself after purchase?

Yes, 45# steel is machinable on a lathe or with a boring bar. You can enlarge the bore or add a keyway if you have access to appropriate tooling. However, do not enlarge the bore beyond the gear's hub wall thickness, as this will weaken the hub. If in doubt, select the closest available bore size from the variant list.

🛒 Select your tooth count and bore size above, then add to cart.