Spur Gears 1 Mod Transmission Gear With Step 45# Steel Pinion Motor Gear 10T~29T

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Spur Gears 1 Mod Transmission Gear With Step 45# Steel Pinion Motor Gear 10T~29T

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By HomeDIYer®

Size: 1M 10T/Bore 4mm

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$9.97 USD

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In stock (500 units), ready to be shipped

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1 Mod Spur Gear — 45# Steel Pinion Motor Gear for Reliable Power Transmission

When your drive system demands consistent torque transfer and dimensional accuracy, a poorly matched gear becomes the weakest link. Engineers, robotics builders, and DIY machine makers who need a dependable 1 mod spur gear with a wide tooth and bore selection will find this range covers the most common shaft configurations without compromise.

These 1 mod spur gears are machined from 45# carbon steel, offering a balance of hardness and machinability suited to moderate-to-high load applications. The tooth count spans 10T to 29T, with outer diameters ranging from approximately 12 mm (0.47 in) for 10T up to approximately 31 mm (1.22 in) for 29T. Bore options include round bores from 4 mm to 16 mm, D-bore (flat-on-round) configurations, and keyed bores with keyway dimensions such as 3×1.4 mm and 4×1.8 mm. Select variants also feature a stepped hub (Step 17 mm or Step 20 mm) for axial positioning. Face width is typically 10–12 mm depending on the variant selected.

Typical use cases include small CNC router spindle drives, DC motor output stages in robotics and automation rigs, 3D printer extruder and axis drive trains, and custom gearbox assemblies for DIY power tools. The 1 mod pitch makes these gears directly interchangeable with other metric module-1 components, simplifying multi-stage gear train design for hobbyist and light-industrial applications.

⚙️ Compatibility: Metric Module 1 (1 Mod) standard — meshes directly with any other 1M spur gear, rack, or pinion of the same module. Verify bore diameter and keyway dimensions match your shaft before ordering.

✅ Key Features of These 1 Mod Spur Gears

🔩 45# Carbon Steel Construction

Machined from 45# carbon steel for a reliable combination of surface hardness and core toughness, suitable for moderate shock loads and continuous rotation.

📐 Wide Tooth Count Range: 10T–29T

Twenty tooth-count options let you dial in the exact gear ratio needed for your drive stage without resorting to custom machining.

🎯 Multiple Bore Styles

Round bore, D-bore (flat-on-round), and keyed bore variants (3×1.4 mm, 4×1.8 mm, 5×2.3 mm keyways) accommodate a broad range of motor and shaft types in a single product family.

📏 Stepped Hub Options

Select 24T variants include a precision step hub (17 mm or 20 mm step) for positive axial location on shafts without additional collars or retaining rings.

🔄 True Metric Module 1 Standard

Manufactured to the 1 Mod (Module 1) metric gear standard, ensuring direct mesh compatibility with any other 1M rack, pinion, or spur gear in your assembly.

🛠️ Ready for Robotics, CNC & DIY Drives

Bore range from 4 mm to 16 mm covers the output shafts of common DC motors, stepper motors, and servo gearboxes used in robotics, CNC, and small-batch automation.

📐 Technical Specifications — 1 Mod Spur Gear

Module	1M (Metric Module 1)
Tooth Count	10T, 12T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 21T, 22T, 23T, 24T, 25T, 26T, 27T, 28T, 29T
Material	45# Carbon Steel
Bore Type	Round bore / D-bore (flat-on-round) / Keyed bore
Bore Diameter Range	4 mm – 16 mm (see variant options)
Keyway Dimensions	3×1.4 mm, 4×1.8 mm, 5×2.3 mm (see variant options)
Face Width (Thickness)	Typically 10–12 mm (see variant options)
Outer Diameter Range	Approx. 12 mm (10T) – 31 mm (29T)
Pressure Angle	20°
Hub Style	Standard / Stepped hub (Step 17 mm or 20 mm, select variants)
Surface Finish	See variant options
Quantity	1 piece per order

❓ Frequently Asked Questions

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

The tooth count determines the gear ratio when meshed with another gear. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For example, a 10T pinion driving a 20T gear gives a 2:1 reduction. Choose a lower tooth count (10T–15T) for higher speed reduction on a motor output shaft, and a higher tooth count (20T–29T) when you need a smaller ratio or are building an intermediate stage.

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

Select a round bore if you plan to secure the gear with a set screw or locking collar. Choose a D-bore (flat-on-round) if your motor shaft has a flat machined on it — this prevents rotation without a set screw. Select a keyed bore (with a 3×1.4 mm, 4×1.8 mm, or 5×2.3 mm keyway) when your shaft has a matching keyway slot and you need positive torque transmission under higher loads.

What is the pressure angle of these gears?

These gears use the standard 20° pressure angle, which is the most common metric spur gear standard. They will mesh correctly with any other Module 1, 20° pressure angle spur gear, rack, or pinion.

Are these gears suitable for high-speed or high-torque applications?

45# carbon steel provides good strength for moderate-to-high load, moderate-speed applications such as robotics joints, CNC axis drives, and small gearboxes. For very high-speed or heavy industrial loads, consider heat-treated or alloy steel gears. These gears are well-suited to DC motor, stepper motor, and servo output stages operating at typical hobby and light-industrial speeds.

What does the stepped hub variant offer?

Stepped hub variants (available in select 24T sizes) feature a precision shoulder machined into the hub at either 17 mm or 20 mm from the gear face. This step acts as a positive axial stop against a bearing or housing face, eliminating the need for a separate shaft collar or retaining ring to control the gear's axial position.

How do I verify this gear will mesh with my existing gears or rack?

Confirm that your existing gear or rack is also Module 1 (1M) with a 20° pressure angle. The center distance between two meshing spur gears equals half the sum of their pitch diameters: C = (T1 + T2) / 2 mm for Module 1 gears, where T1 and T2 are the tooth counts. For example, a 20T and a 25T gear mesh at a center distance of (20 + 25) / 2 = 22.5 mm.

Can I use these gears outdoors or in wet environments?

45# carbon steel is not inherently corrosion-resistant. For outdoor or humid environments, apply a suitable lubricant or protective coating, or consider stainless steel or plastic gears for corrosion-critical applications. Regular lubrication with gear grease will extend service life in all environments.

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