4 Modul Steel Spur Gears Pinion Gear Thick 35mm 10-40 Teeth For 3D CNC
4 Modul Steel Spur Gears Pinion Gear Thick 35mm 10-40 Teeth For 3D CNC
4 Modul Steel Spur Gears Pinion Gear Thick 35mm 10-40 Teeth For 3D CNC
4 Modul Steel Spur Gears Pinion Gear Thick 35mm 10-40 Teeth For 3D CNC
4 Modul Steel Spur Gears Pinion Gear Thick 35mm 10-40 Teeth For 3D CNC
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4 Modul Steel Spur Gears Pinion Gear Thick 35mm 10-40 Teeth For 3D CNC4 Modul Steel Spur Gears Pinion Gear Thick 35mm 10-40 Teeth For 3D CNC4 Modul Steel Spur Gears Pinion Gear Thick 35mm 10-40 Teeth For 3D CNC4 Modul Steel Spur Gears Pinion Gear Thick 35mm 10-40 Teeth For 3D CNC4 Modul Steel Spur Gears Pinion Gear Thick 35mm 10-40 Teeth For 3D CNC

4 Modul Steel Spur Gears Pinion Gear Thick 35mm 10-40 Teeth For 3D CNC

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$12.62 USD
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In stock (500 units), ready to be shipped

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Description

4 Mod Steel Spur Gears — Precision Pinion Gears for CNC & 3D Printer Builds

When your CNC router stalls mid-cut or your 3D printer axis skips steps, the culprit is often an undersized or poorly machined drive gear. These 4 Modul steel spur gears are engineered for makers, hobbyists, and small-workshop builders who need reliable, repeatable torque transmission without the guesswork of sourcing industrial surplus parts.

Each gear is machined from carbon steel with a uniform face width of 35 mm (1.38 in). The module (Mod) rating of 4 defines the tooth pitch — a larger module means stronger, more robust teeth suited to moderate-to-heavy load applications. Available tooth counts range from 10 to 40 teeth, giving pitch circle diameters from approximately 40 mm (1.57 in) up to 160 mm (6.30 in). Bore diameter varies by tooth count; see variant options for exact bore specs.

Typical use cases include CNC router Z-axis and rack-and-pinion drives, 3D printer extruder and gantry gear trains, DIY automation conveyor and indexing mechanisms, and educational robotics platforms requiring standardized metric gearing.

⚙️ Compatibility: Fits standard Mod 4 metric gear systems. Pairs directly with Mod 4 racks, worm gears, and mating spur gears. Verify bore diameter against your shaft size before ordering.

✅ Key Features of These 4 Mod Steel Spur Gears

🔩 Carbon Steel Construction

Machined from carbon steel for solid load-bearing capacity and resistance to deformation under sustained torque — a step up from plastic or aluminum alternatives in demanding drive applications.

📐 35 mm Uniform Face Width

The consistent 35 mm (1.38 in) face width across all tooth-count variants ensures even load distribution and simplifies gear-train alignment in multi-stage drive systems.

⚙️ Module 4 Standardized Pitch

Module 4 tooth geometry conforms to ISO metric gear standards, making these pinions directly interchangeable with any Mod 4 mating gear, rack, or gearbox on the market.

🎯 Wide Tooth-Count Selection (10–40 Teeth)

Thirty-one variants from 10 to 40 teeth let you dial in the exact gear ratio your drive system needs — from high-speed, low-torque pinions to slower, higher-torque output gears.

🏭 CNC-Machined Bore & Hub

Each gear features a CNC-machined central bore and hub for accurate shaft fit. Bore diameter varies by tooth count; see variant options for the exact bore dimension of your selected model.

🔧 Drop-In Fit for CNC & 3D Printer Drives

Designed to slot directly into standard Mod 4 rack-and-pinion and gear-train assemblies used in CNC routers, 3D printers, and DIY automation rigs — minimal modification required.

📐 Technical Specifications — 4 Mod Steel Spur Gear

Module (Mod) 4
Tooth Count Range 10 – 40 Teeth (31 variants)
Face Width (Thickness) 35 mm (1.38 in)
Pitch Circle Diameter Range 40 mm – 160 mm (1.57 in – 6.30 in)
Material Carbon Steel
Pressure Angle 20°
Bore Diameter See variant options
Hub Diameter See variant options
Surface Finish See variant options
Gear Standard ISO Metric Module 4
Compatible Gear Type Mod 4 Spur Gear, Rack, Worm Gear
Typical Applications CNC Router, 3D Printer, DIY Automation, Robotics

❓ Frequently Asked Questions

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

Tooth count determines your gear ratio. A smaller pinion (10–15 teeth) paired with a larger mating gear gives you torque multiplication — ideal for heavy CNC axes. A larger pinion (30–40 teeth) reduces ratio and increases output speed, better suited for lighter, faster-moving assemblies. Calculate your required ratio first, then select the tooth count that achieves it with your mating gear.

What shaft diameter does this gear fit?

Bore diameter varies by tooth count variant. Please check the variant options on this page for the exact bore size of your selected model. If your shaft diameter differs, a machinist can typically re-bore the hub to your required dimension.

Is carbon steel strong enough for my CNC router drive?

Yes, for the majority of hobbyist and small-workshop CNC routers. Carbon steel offers a solid balance of tensile strength and machinability. For very high-cycle industrial applications or corrosive environments, consider whether a hardened or stainless variant better suits your duty cycle.

Will these gears rust or corrode?

Carbon steel can oxidize if exposed to moisture over time. For indoor CNC and 3D printer environments, applying a light machine oil or grease to the gear teeth during operation provides adequate corrosion protection. For outdoor or high-humidity applications, consider adding a protective coating or selecting a stainless steel alternative.

Are these compatible with Mod 4 racks for rack-and-pinion drives?

Yes. These gears conform to ISO Mod 4 tooth geometry with a standard 20° pressure angle, making them directly compatible with any Mod 4 rack. This is a common configuration for CNC router X/Y axis drives and linear motion systems.

How do I decide between a 10-tooth and a 40-tooth pinion?

A 10-tooth pinion has a pitch circle diameter of 40 mm and is best for high-reduction, high-torque drive stages where speed is less critical. A 40-tooth pinion has a pitch circle diameter of 160 mm and suits lower-reduction stages where you need more speed and less torque multiplication. Most CNC rack-and-pinion setups use pinions in the 14–20 tooth range for a balanced speed-to-torque ratio.

Can I use these gears in a 3D printer extruder or gantry?

These gears are well-suited for 3D printer gantry and motion systems that use Mod 4 metric gearing. For direct-drive extruders, verify the bore diameter matches your motor shaft and that the tooth count aligns with your desired extrusion ratio before ordering.

🛒 Select your tooth count (Model) above, then add to cart.

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