1.5 Mod 12 Teeth Spur Gears Bore 5-8mm Transmission Gear With Step 45# Steel

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1.5 Mod 12 Teeth Spur Gears Bore 5-8mm Transmission Gear With Step 45# Steel

Name: 1.5 Mod 12 Teeth Spur Gears Bore 5-8mm Transmission Gear With Step 45# Steel
Brand: HomeDIYer
Price: 10.58 USD
Availability: InStock

HomeDIYer

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By HomeDIYer®

Size: 1.5M 12T, Bore 5mm

Packing Quantity: 1 pcs

Price:

$10.58 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

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1.5 Mod 12-Tooth Stepped Spur Gear — Precision 45# Steel for DIY Automation Builds

When your motion-control project demands consistent torque transfer and tight dimensional tolerances, a poorly fitted gear can derail the entire build. Makers, robotics hobbyists, and small-workshop engineers who need a reliable 1.5 Mod 12-tooth spur gear with a stepped bore will find this component ready to drop into their drivetrain without custom machining.

Each gear is machined from 45# medium-carbon steel, offering a solid balance of hardness and machinability. The stepped hub design allows the gear to seat securely against a shoulder on the shaft, reducing axial play. Bore options span 5 mm to 8 mm (approximately 0.197 in to 0.315 in), covering the most common shaft diameters used in compact automation and robotics platforms. Overall gear diameter is approximately 19.5 mm (0.77 in) based on the 1.5 module and 12-tooth count (PCD = Module × Teeth = 18 mm).

Typical use cases include DIY conveyor belt drives using 1.5M timing-adjacent spur stages, small CNC axis gear reduction trains, and educational robotics kits requiring interchangeable stepped-bore gears. The multi-piece packing options (1–10 pcs) make it straightforward to stock spares or build symmetric gear pairs for balanced load distribution.

⚙️ Compatibility: Fits shafts of 5 mm, 6 mm, 6.35 mm (1/4 in), 7 mm, and 8 mm diameter. Module 1.5 — meshes with any standard Mod 1.5 spur or helical gear of matching pressure angle (typically 20°). Verify shaft diameter and gear mesh clearance before ordering.

✅ Key Features of These 1.5 Mod 12-Tooth Stepped Spur Gears

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45# Medium-Carbon Steel Construction

Machined from 45# steel for a reliable combination of surface hardness and core toughness, suitable for moderate-load gear mesh applications in automation and robotics.

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Module 1.5 — 12 Teeth

Standard Mod 1.5 tooth profile ensures interchangeability with other Mod 1.5 gears. 12-tooth count delivers a compact pitch circle diameter of 18 mm for space-constrained drivetrains.

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Stepped Hub Design

The integrated step on the hub provides a positive axial stop against a shaft shoulder, reducing end-play and keeping the gear positioned accurately under dynamic loads.

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Five Bore Sizes Available

Choose from 5 mm, 6 mm, 6.35 mm, 7 mm, or 8 mm bore to match your shaft without sleeve adapters. Select your bore size from the variant options above.

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Flexible Pack Quantities (1–10 pcs)

Order a single gear for a prototype or up to 10 pieces for a full build run. Multi-pack pricing offers better per-unit value for larger projects.

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Broad Application Range

Suited for DIY conveyor drives, CNC axis reduction stages, educational robotics kits, and small automation platforms where a compact, stepped-bore spur gear is required.

📐 Technical Specifications — 1.5 Mod Spur Gear

Module (Mod)	1.5
Number of Teeth	12
Pitch Circle Diameter (PCD)	18 mm (0.709 in)
Pressure Angle	20° (standard)
Hub Style	Stepped hub
Bore Diameter Options	5 mm / 6 mm / 6.35 mm / 7 mm / 8 mm
Material	45# medium-carbon steel
Surface Finish	See variant options
Overall Gear Width	See variant options
Hub Outer Diameter	See variant options
Keyway	See variant options
Set Screw	See variant options
Pack Quantity Options	1 / 2 / 3 / 4 / 5 / 8 / 10 pcs

❓ Frequently Asked Questions

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

Measure your shaft diameter with a caliper. Select the bore that matches exactly — 5 mm, 6 mm, 6.35 mm (common for 1/4-inch shafts), 7 mm, or 8 mm. A bore that is too large will cause runout and vibration; a bore that is too small will not fit without machining. Use the Size variant selector above to pick your bore.

Will this gear mesh with my existing Mod 1.5 gears?

Yes — any two gears with the same module (1.5) and the same pressure angle (20° standard) will mesh correctly regardless of tooth count. Verify that the center distance between shafts equals (Teeth₁ + Teeth₂) × Module / 2 to ensure proper backlash.

Is 45# steel strong enough for my application?

45# medium-carbon steel is widely used for moderate-load gear applications. It offers good tensile strength (typically 600–800 MPa depending on heat treatment) and can be surface-hardened if needed. For very high-torque or high-speed continuous-duty applications, consider whether a hardened or alloy-steel gear would be more appropriate for your load case.

Does the stepped hub prevent the gear from sliding along the shaft?

The step provides a positive axial stop when the gear seats against a shaft shoulder or retaining feature. For full axial retention, pair it with a set screw, retaining ring, or shaft collar on the opposite side. Check the variant detail for set screw availability on this model.

Is this gear corrosion-resistant for outdoor or humid environments?

45# steel is not inherently corrosion-resistant. For humid or outdoor environments, apply a light machine oil or grease to the gear surfaces, or consider a protective coating. If long-term corrosion resistance is critical, a stainless-steel or plastic gear may be a better fit for your application.

Should I order 1 pc to test fit before buying a multi-pack?

That is a practical approach for new builds. Order a single piece first to confirm bore fit, mesh engagement, and hub clearance in your assembly. Once validated, the 5-pack or 10-pack options offer better per-unit value for production runs or spare-parts stocking.

What is the pitch circle diameter and why does it matter?

The pitch circle diameter (PCD) is calculated as Module × Teeth = 1.5 × 12 = 18 mm. This is the theoretical circle at which two meshing gears make contact. You need the PCD of both gears to calculate the correct center-to-center shaft distance for your gearbox or drive stage.

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