1.5 Mod 45 Teeth Spur Gears Transmission Gear With Step 45# Steel Blackening

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1.5 Mod 45 Teeth Spur Gears Transmission Gear With Step 45# Steel Blackening

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By HomeDIYer®

Choose Model: 1.5M 45T, Tooth Thickness 15mm

Bore: 8mm

Packing Quantity: 1 pcs

Price:

$82.09 USD

Stock:

In stock (500 units), ready to be shipped

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1.5 Mod 45-Tooth Spur Gear with Step — Reliable Power Transmission for DIY Automation

When your motion-control build demands a gear that fits precisely and holds up under load, a loose tolerance or soft-metal substitute wastes hours of rework. Makers, hobbyists, and small-workshop engineers who need a dependable 1.5 module spur gear with a stepped bore will find this 45-tooth option engineered to drop straight into standard drive trains without play or wobble.

Each gear is machined from 45# medium-carbon steel and finished with a blackening (bluing) surface treatment that reduces surface friction and provides a baseline level of corrosion resistance. The stepped hub design accommodates both plain round bores (8 mm – 25 mm / approx. 0.31 in – 0.98 in) and keyed bores (5×2.3 mm and 6×2.8 mm keyway profiles), covering a wide range of shaft diameters. Tooth thickness is 15 mm (approx. 0.59 in), and the module is 1.5 M with 45 teeth, giving an approximate pitch diameter of 67.5 mm (2.66 in).

Typical use cases include DIY CNC router axis drives, 3D-printer extruder gear trains, small conveyor reduction stages, and educational robotics platforms where a 1.5 mod 45-tooth spur gear with keyed bore or stepped hub is required for precise shaft-to-gear coupling.

⚙️ Compatibility: Designed for Module 1.5 gear systems. Mates with any standard 1.5M spur or rack gear. Verify bore size and keyway dimensions against your shaft before ordering.

✅ Key Features of These 1.5 Mod 45-Tooth Spur Gears

🔩45# Steel Construction — Medium-carbon steel provides solid tensile strength and wear resistance for sustained rotational loads in power transmission applications.
⬛Blackening Surface Treatment — The oxidizing finish reduces bare-metal friction, offers light corrosion protection, and gives a clean, uniform appearance without adding dimensional bulk.
📐Stepped Hub Design — The integrated step allows the gear to seat positively on shafts of varying diameters, reducing axial float and simplifying assembly in tight housings.
🔄Wide Bore Selection — Round bores from 8 mm to 25 mm plus keyed options (5×2.3 mm and 6×2.8 mm) mean one product listing covers most standard shaft sizes used in DIY and light-industrial drives.
📦Flexible Pack Quantities — Available in 1, 2, or 3-piece packs so you can order exactly what your project needs — single replacement or a matched set for multi-axis builds.
🎯Standard 1.5M Module Pitch — Fully interchangeable with any Module 1.5 rack, pinion, or mating spur gear, making integration into existing drive systems straightforward.

📐 Technical Specifications — 1.5 Mod Spur Gear

Module	1.5 M
Number of Teeth	45 T
Tooth Thickness	15 mm (0.59 in)
Approximate Pitch Diameter	67.5 mm (2.66 in)
Bore Type	Round bore or keyed bore (see variant options)
Round Bore Range	8 mm – 25 mm (0.31 in – 0.98 in)
Keyway Options	5×2.3 mm / 6×2.8 mm
Hub Style	Stepped hub
Material	45# Medium-Carbon Steel
Surface Treatment	Blackening (bluing oxidation)
Pressure Angle	See variant options
Gear Width (Face Width)	15 mm (0.59 in)
Packing Quantity	1 pcs / 2 pcs / 3 pcs (see variant options)

❓ Frequently Asked Questions

How do I choose the right bore size for my shaft?

Measure your shaft diameter with a caliper. For a plain round shaft, select the matching round bore (e.g., 10 mm shaft → 10 mm bore). If your shaft has a keyway, match both the shaft diameter and the keyway width/depth to one of the keyed bore options (5×2.3 mm or 6×2.8 mm). A set screw or interference fit is typically used to secure round-bore gears on the shaft.

What does the "stepped hub" design mean, and why does it matter?

A stepped hub means the gear body has a raised cylindrical boss (step) around the bore. This step provides a longer engagement surface on the shaft, improving concentricity and reducing wobble compared to a flat-hub gear. It also makes it easier to position the gear axially along the shaft and to retain it with a collar or snap ring.

Is 45# steel strong enough for my application?

45# steel (equivalent to AISI 1045) is a medium-carbon steel widely used for machine gears, shafts, and structural components. It offers a good balance of tensile strength (typically 600–800 MPa) and machinability. It is well-suited for light-to-medium duty power transmission in DIY CNC, robotics, and conveyor applications. For very high-torque or high-speed industrial drives, consider consulting a mechanical engineer for a hardened-gear specification.

Does the blackening finish protect against rust?

The blackening (hot or cold oxidation) treatment provides a thin magnetite layer that offers light corrosion resistance and reduces surface friction. It is not a heavy-duty anti-corrosion coating like zinc plating or powder coat. For environments with moisture, oils, or mild chemicals, applying a light machine oil after installation is recommended to extend the finish life.

Will this gear mesh correctly with my existing Module 1.5 rack or pinion?

Yes — as long as your existing rack, pinion, or mating gear is also Module 1.5 with the same pressure angle (typically 20°), this gear will mesh correctly. Module is the primary compatibility parameter for spur gears. Confirm the pressure angle of your existing components before ordering if you are unsure.

Can I use this gear in a vertical load-bearing orientation?

This gear is designed for rotational power transmission in standard drive-train configurations. It can be used in vertical orientations (e.g., Z-axis drives on CNC routers) provided the shaft is properly supported by bearings and the load does not exceed the gear's rated capacity. Ensure adequate lubrication and that the bore-to-shaft fit is secure to prevent axial slippage under gravity loads.

What is the difference between the keyed bore variants and the round bore variants?

Round bore variants have a smooth cylindrical hole and are typically secured to the shaft with a set screw or press fit. Keyed bore variants have a slot (keyway) machined into the bore that accepts a matching key on the shaft, providing a positive mechanical lock that prevents rotational slipping under torque — ideal for higher-torque or reversing-load applications.

🛒 Select your bore size and packing quantity above, then add to cart.