1 Module 45# Steel Spur Gear 33T-150T 1M Metal Pinion Gear For Motor CNC Robot

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1 Module 45# Steel Spur Gear 33T-150T 1M Metal Pinion Gear For Motor CNC Robot

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By HomeDIYer®

Teeth: 33 teeth

Inner Hole: 6mm

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$6.16 USD

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In stock (500 units), ready to be shipped

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1 Module 45# Steel Spur Gear — Precision Metal Pinion for CNC, Robotics & Motor Drives

Engineers and makers building CNC machines, robotic arms, or automated drive systems often struggle to find spur gears that combine dimensional accuracy with long-term durability. This 1 Module (1M) 45# steel spur gear series is designed for builders who need reliable, repeatable power transmission across a wide range of gear ratios — from compact 33-tooth pinions to large 150-tooth ring gears.

Each gear is machined from 45# medium-carbon steel, offering a balance of hardness and machinability suited to moderate-to-high load applications. The module is 1M (metric), with outer diameters scaling proportionally from approximately 35mm (≈1.38 in) at 33T up to approximately 152mm (≈5.98 in) at 150T. Inner bore options range from 6mm to 30mm (≈0.24–1.18 in) to accommodate a wide variety of motor and shaft sizes. Some larger tooth-count variants include a stepped hub (Step 25mm–70mm) for additional shaft engagement depth.

Typical use cases include: DIY CNC router Z-axis drives requiring a 1M rack-and-pinion or gear-pair reduction; robotic joint actuators using a 33T–60T pinion meshed with a larger driven gear; and small-batch automation conveyor drives where a 80T–150T spur gear provides the final stage reduction on a stepper or servo motor shaft.

⚙️ Compatibility: Meshes with all 1 Module (1M) metric spur gears, racks, and pinions. Verify bore diameter matches your motor or shaft OD before ordering.

✅ Key Features of These 1M Steel 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 continuous-duty motor and CNC drive applications.

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Wide Tooth Count Range: 33T to 150T

A single product line covers gear ratios from compact pinions to large driven gears, reducing the need to source from multiple suppliers for a complete drivetrain.

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Multiple Bore Sizes: 6mm–30mm

Inner hole options from 6mm to 30mm (including 6.35mm and 12.7mm imperial-equivalent sizes) accommodate NEMA stepper motors, servo shafts, and standard metric shafts.

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Stepped Hub Variants Available

Select tooth counts (36T, 40T, 44T, 48T, 80T, 90T, 100T, 120T, 130T, 150T) include stepped hub options (25mm–70mm step height) for deeper shaft engagement and improved axial stability.

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Standard 1M Metric Module

Fully interchangeable with any 1 Module metric gear, rack, or pinion — a widely adopted standard in CNC, robotics, and light industrial automation worldwide.

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CNC-Machined Tooth Profile

Involute tooth geometry machined to consistent tolerances for smooth meshing, reduced backlash, and predictable load transfer in precision drive applications.

📐 Technical Specifications — 1M Steel Spur Gear

Module	1M (Metric)
Material	45# Medium-Carbon Steel
Tooth Count Range	33T – 150T
Bore (Inner Hole) Range	6mm, 6.35mm, 7mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 22mm, 24mm, 25mm, 30mm
Outer Diameter (OD)	See variant options (scales with tooth count at 1M pitch)
Hub Step Height	See variant options (25mm / 26mm / 28mm / 30mm / 35mm / 38mm / 40mm / 50mm / 70mm where applicable)
Pressure Angle	20° (standard involute)
Tooth Profile	Involute, CNC-machined
Surface Finish	See variant options
Weight	See variant options (varies by tooth count and hub configuration)
Compatible Standards	1M metric spur gear / rack systems
Typical Applications	CNC drives, robotic joints, stepper/servo motor pinions, automation conveyors

❓ Frequently Asked Questions

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

The gear ratio between two meshing gears equals the driven gear tooth count divided by the driving gear (pinion) tooth count. For example, pairing a 33T pinion with a 66T gear gives a 2:1 reduction. Choose a smaller tooth count (33T–50T) for the motor-side pinion and a larger count (60T–150T) for the driven shaft. Confirm that both gears share the same module (1M) for proper meshing.

What bore size should I select for my motor shaft?

Measure your motor or shaft outer diameter precisely with calipers. Common stepper motor shaft sizes are 5mm, 6mm, 6.35mm (1/4 in), and 8mm. Servo motors often use 8mm, 10mm, or 12mm shafts. Select the bore that matches your shaft OD — a keyway or set-screw collar is typically used to secure the gear axially. If your shaft size is not listed, contact us to confirm availability.

What is the load capacity of these 45# steel spur gears?

45# steel provides a tensile strength of approximately 600–800 MPa depending on heat treatment. These gears are suited to moderate-to-high load CNC and robotic applications at low-to-medium speeds (typically under 1000 RPM for continuous duty). For very high-speed or shock-load applications, consider hardened or alloy steel alternatives. Exact load ratings depend on tooth count, face width, and operating conditions.

Are these gears corrosion-resistant?

45# carbon steel is not inherently corrosion-resistant. For indoor CNC or robotic environments, light lubrication (grease or gear oil) is recommended to prevent surface oxidation and reduce wear. For outdoor or humid environments, consider applying a rust-inhibiting coating or selecting stainless steel alternatives if available.

What does the "Step" dimension mean in the tooth count options?

The "Step" value (e.g., "36 teeth Step 28mm") refers to the height of the raised hub boss on one face of the gear. A stepped hub provides a longer shaft engagement surface, which improves concentricity and reduces wobble on longer shafts. If your application requires a flush-face gear, select a variant without a step designation. If you need additional axial support, choose the stepped variant that matches your shaft length and bearing spacing.

Will this gear mesh with a 1M rack or other 1M gears I already have?

Yes. All gears in this listing use the standard 1 Module (1M) metric tooth profile with a 20° pressure angle, which is fully interchangeable with any other 1M metric spur gear, pinion, or rack from any manufacturer. Verify that the mating component is also 1M — mixing modules (e.g., 1M with 1.5M) will result in incorrect meshing and accelerated wear.

Can I use these gears with a keyway or set screw?

The bore is machined as a plain round hole. A set screw (grub screw) collar or shaft collar is the most common method to secure the gear to the shaft. If your application requires a keyway, the bore can typically be broached or EDM-machined by a local machine shop after purchase. Contact us if you need a pre-keyway option for specific tooth counts.

🛒 Select your Teeth count and Inner Hole size above, then add to cart.