Spur Gears 1.5 Mod Transmission Gear With Step 45#Steel Pinion Motor Gear 30/80T

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Spur Gears 1.5 Mod Transmission Gear With Step 45#Steel Pinion Motor Gear 30/80T

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By HomeDIYer®

Size: 1.5M 30T/Bore 5mm (Step 35mm)

Packing Quantity: 1 Pcs

Price:

$25.65 USD

Stock:

In stock (500 units), ready to be shipped

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1.5 Mod Spur Gears — Precision Step-Bore Pinion Gears for Reliable Power Transmission

When a loose-fitting gear causes backlash, vibration, or premature shaft wear in your drive system, the root cause is almost always a mismatch between bore tolerance and shaft diameter. Engineers, robotics builders, and small-batch manufacturers who need a drop-in, shaft-ready spur gear will find these 1.5 Mod step-bore pinion gears engineered to eliminate that problem from the start.

Each gear is machined from 45# carbon steel, offering a balanced combination of tensile strength and machinability. The module is 1.5 (metric), tooth counts are 30T or 80T, and bore diameters range from 5 mm (≈0.197 in) up to 30 mm (≈1.181 in) depending on the selected variant. Step lengths of 25 mm or 35 mm are available across the 30T range; keyed bore options (e.g., 4×1.8 mm, 5×2.3 mm, 6×2.8 mm, 8×3.3 mm keyways) are offered on select sizes for positive torque transmission without set-screw slippage.

Typical use cases include DC motor pinion drives in mobile robotics platforms, lead-screw stage gearing in desktop CNC routers, and reduction stages in conveyor or actuator assemblies where a compact 1.5 Mod pitch is specified. The step-bore design also suits educators and prototypers who need to swap shaft sizes without re-machining the gear blank.

⚙️ Compatibility: Module 1.5 (metric) — meshes with any 1.5 Mod mating gear or rack. Verify bore diameter and keyway dimensions against your shaft before ordering.

✅ Key Features of These 1.5 Mod Step-Bore Spur Gears

🔩

45# Carbon Steel Construction

Machined from medium-carbon 45# steel for a solid balance of surface hardness and core toughness, suitable for continuous-duty drive applications.

📐

Module 1.5 Metric Pitch

Standard 1.5 Mod pitch ensures direct interchangeability with any 1.5 Mod mating gear, rack, or gearbox in your existing drivetrain.

🎯

Step-Bore Design (25 mm & 35 mm Steps)

The stepped hub allows the gear to seat positively against a shoulder or spacer, reducing axial float and simplifying assembly on motor shafts.

🔑

Keyed Bore Options Available

Select variants include precision-cut keyways (4×1.8 mm, 5×2.3 mm, 6×2.8 mm, 8×3.3 mm) for positive torque lock without relying solely on set screws.

📦

Flexible Pack Quantities

Available in 1, 3, 5, or 10-piece packs — order a single gear for prototyping or a multi-pack for production runs and spares inventory.

⚡

Wide Bore Range: 5 mm – 30 mm

Covers the most common motor and shaft diameters used in robotics, automation, and light industrial drives, reducing the need for custom bushing adapters.

📐 Technical Specifications — 1.5 Mod Spur Gears

Module	1.5 (Metric)
Tooth Count	30T / 80T (see variant options)
Material	45# Carbon Steel
Bore Diameter Range	5 mm – 30 mm (≈0.197 – 1.181 in) — see variant options
Step Length	25 mm or 35 mm — see variant options
Keyway Options	4×1.8 mm / 5×2.3 mm / 6×2.8 mm / 8×3.3 mm (select variants)
Pressure Angle	20° (standard metric spur gear)
Surface Finish	See variant options
Pack Quantity	1 / 3 / 5 / 10 Pcs — see variant options
Weight (per piece)	See variant options

❓ Frequently Asked Questions

How do I choose between the 30T and 80T versions?

The tooth count determines your gear ratio when paired with a mating gear. A 30T pinion paired with a 30T gear gives a 1:1 ratio; a 30T pinion driving an 80T gear gives approximately a 2.67:1 reduction. Choose 30T for higher-speed, lower-torque output and 80T when you need more torque multiplication in a single stage.

What does the step bore do, and which step length should I choose?

The step bore creates a shoulder inside the hub so the gear seats against a shaft shoulder, circlip groove, or spacer — preventing axial movement without additional hardware. Choose the 25 mm step if your motor shaft or mounting space is shorter; choose the 35 mm step for longer shaft engagement or when you need more hub contact area for set-screw retention.

Do I need a keyway, or will a set screw bore work?

For light-duty or intermittent loads, a plain bore with a set screw is typically sufficient. For continuous-duty, reversing, or high-torque applications, a keyed bore (with a matching key on the shaft) provides positive torque transmission and prevents the gear from rotating on the shaft under shock loads. Select the variant with the keyway size that matches your shaft specification.

Will this gear mesh with my existing 1.5 Mod rack or gearbox?

Yes — any gear or rack with a 1.5 metric module and a 20° pressure angle will mesh correctly with these gears. Confirm the module and pressure angle of your existing components before ordering. Module is not the same as pitch (DP); do not mix metric module gears with imperial diametral pitch gears.

How strong are these gears, and what loads can they handle?

45# carbon steel has a typical tensile strength of approximately 600–700 MPa and yield strength around 355 MPa. Actual load capacity depends on operating speed, lubrication, duty cycle, and mating gear material. For precise load ratings, apply standard AGMA or ISO 6336 gear strength calculations using the tooth geometry and material properties. These gears are suited for light-to-medium industrial and robotics drives.

Are these gears corrosion-resistant for outdoor or humid environments?

45# carbon steel has limited inherent corrosion resistance. For outdoor, humid, or washdown environments, apply a suitable lubricant or protective coating (e.g., grease, anti-rust spray, or zinc plating) after installation. If corrosion resistance is a primary requirement, consider stainless steel or plastic gear alternatives for your application.

How do I select the correct bore diameter for my motor shaft?

Measure your motor or drive shaft diameter with a caliper. Select the variant whose bore diameter matches your shaft — for a plain bore, a light interference or transition fit (H7/k6) is typical for set-screw retention; for a keyed bore, match both the bore diameter and the keyway width/depth to your shaft key. If your shaft diameter falls between listed sizes, contact us to confirm the closest fit.

🛒 Select your Size and Packing Quantity above, then add to cart.