4 Mod 10-24 Teeth Spur Gears Transmission Gear Pinion Thickness 35mm 45# Steel
4 Mod 10-24 Teeth Spur Gears Transmission Gear Pinion Thickness 35mm 45# Steel
4 Mod 10-24 Teeth Spur Gears Transmission Gear Pinion Thickness 35mm 45# Steel
4 Mod 10-24 Teeth Spur Gears Transmission Gear Pinion Thickness 35mm 45# Steel
4 Mod 10-24 Teeth Spur Gears Transmission Gear Pinion Thickness 35mm 45# Steel
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4 Mod 10-24 Teeth Spur Gears Transmission Gear Pinion Thickness 35mm 45# Steel4 Mod 10-24 Teeth Spur Gears Transmission Gear Pinion Thickness 35mm 45# Steel4 Mod 10-24 Teeth Spur Gears Transmission Gear Pinion Thickness 35mm 45# Steel4 Mod 10-24 Teeth Spur Gears Transmission Gear Pinion Thickness 35mm 45# Steel4 Mod 10-24 Teeth Spur Gears Transmission Gear Pinion Thickness 35mm 45# Steel

4 Mod 10-24 Teeth Spur Gears Transmission Gear Pinion Thickness 35mm 45# Steel

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$35.47 USD
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In stock (500 units), ready to be shipped

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Description

Mod 4 Spur Gears — Reliable Power Transmission for DIY Automation Projects

When your motion-control build demands precise torque transfer without slippage or backlash surprises, choosing the right spur gear matters. These Mod 4 spur gears are engineered for makers, small-workshop builders, and engineering students who need a dependable, off-the-shelf gear that drops straight into their drivetrain without custom machining.

Each gear is machined from 45# medium-carbon steel — a material known for its balanced hardness and toughness — and features a 35 mm (≈1.38 in) face width. The module (pitch) is 4 mm, with tooth counts ranging from 10 T to 24 T, giving pitch circle diameters from approximately 40 mm (≈1.57 in) to 96 mm (≈3.78 in). Bore diameter and keyway dimensions vary by tooth count; see variant options for exact bore specs.

Typical use cases include DIY CNC router Z-axis drives, conveyor belt reduction stages, robotic arm joint transmissions, and educational gear-train demonstration rigs — anywhere a Mod 4 parallel-shaft spur gear is called for.

⚙️ Compatible with any Mod 4 mating gear, rack, or pinion. Ensure shaft bore and keyway match your application before ordering.

✅ Key Features of These Mod 4 Spur Gears

  • 🔩 45# Medium-Carbon Steel Construction — Offers a solid balance of tensile strength and machinability, suitable for moderate-to-heavy load transmission in Mod 4 spur gear applications.
  • 📐 35 mm Face Width (≈1.38 in) — Wider face distributes tooth load across a larger contact area, reducing surface stress and extending service life compared to narrower pinions.
  • 🎯 10 to 24 Tooth Range — Covers a broad gear-ratio selection in a single product family; mix and match tooth counts to achieve your target reduction or speed-up ratio.
  • 🔄 Standard Mod 4 Pitch — Fully interchangeable with any other Mod 4 spur gear, rack, or pinion on the market, simplifying replacement and system expansion.
  • 📦 Flexible Pack Quantities (1 / 2 / 3 pcs) — Order a single gear for prototyping or multi-packs for production builds and spare-parts inventory, with per-unit savings on larger quantities.
  • 🏭 Precision-Machined Bore & Keyway — Each gear is bored and keyed to standard tolerances, enabling direct shaft mounting without additional machining in most DIY and light-industrial setups.

📐 Technical Specifications — Mod 4 Spur Gears

Module (Pitch) 4 mm
Tooth Count Range 10 T – 24 T (see variant options)
Face Width 35 mm (≈1.38 in)
Pitch Circle Diameter 40 mm – 96 mm (≈1.57 – 3.78 in), varies by tooth count
Material 45# Medium-Carbon Steel
Pressure Angle 20°
Bore Diameter See variant options
Keyway See variant options
Surface Finish See variant options
Weight See variant options
Pack Quantity 1 pcs / 2 pcs / 3 pcs (choose above)

❓ Frequently Asked Questions

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

The gear ratio between two meshing Mod 4 spur gears equals the ratio of their tooth counts. For example, pairing a 10 T pinion with a 20 T gear gives a 2:1 reduction. Decide your desired input/output speed ratio first, then select tooth counts that achieve it while keeping both gears within your available center-distance envelope. The pitch circle diameter is simply Module × Teeth (e.g., 4 × 15 = 60 mm PCD).

What load can these Mod 4 spur gears handle?

45# steel has a typical tensile strength of approximately 600–800 MPa. Actual load capacity depends on tooth count, face width, operating speed, and lubrication. The 35 mm face width provides a good load-distribution area for light-to-moderate industrial and DIY automation loads. For heavy-duty or high-cycle applications, consult a gear-strength calculation (Lewis equation or AGMA standard) using your specific operating parameters.

Are these gears corrosion-resistant?

45# carbon steel is not inherently corrosion-resistant. For outdoor or humid environments, apply a light machine oil or grease coating during storage and operation. If your application requires corrosion resistance, consider pairing these gears with a protective coating or selecting a stainless-steel alternative for the exposed components.

Will these gears mesh with my existing Mod 4 rack or pinion?

Yes — any two gears with the same module and pressure angle will mesh correctly. These gears use a standard 20° pressure angle and Mod 4 pitch, so they are fully compatible with any other Mod 4 / 20° spur gear, rack, or pinion regardless of brand. Verify center distance: C = (PCD₁ + PCD₂) / 2.

What bore diameter and keyway size do these gears have?

Bore diameter and keyway dimensions vary by tooth count (and therefore by gear size). Please refer to the variant detail page or contact us to confirm the exact bore and keyway specifications for the specific tooth count you need before ordering, to ensure compatibility with your shaft.

Should I order 1, 2, or 3 pcs?

Order 1 pc for prototyping or single-axis builds. Choose 2 pcs when you need a matched pair (e.g., two identical gears on parallel shafts) or want a spare on hand. The 3-pcs pack offers the best per-unit value and is ideal for production runs, classroom kits, or multi-axis machines where the same gear size is used in several locations.

Do these gears require lubrication?

Yes. Like all steel spur gears, these benefit from regular lubrication to reduce friction, wear, and noise. Apply a light gear grease or machine oil to the tooth flanks before first use and re-lubricate periodically based on your duty cycle. Enclosed gearboxes can use an oil bath; open drives should use a grease that resists flinging off at operating speed.

🛒 Select your model (tooth count) and packing quantity above, then add to cart.

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