2Mod 2.5Mod 3Mod 4Mod 5Mod Flat Plain Straight Spur Gear 10-62 Teeth Pilot Bore

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2Mod 2.5Mod 3Mod 4Mod 5Mod Flat Plain Straight Spur Gear 10-62 Teeth Pilot Bore

HomeDIYer

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By HomeDIYer®

Modulus: 2 Mod

Teeth: 10 teeth

Price:

$4.86 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

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Metric Spur Gear with Pilot Bore — Precise Power Transmission for Robotics, Automation & DIY Machinery

Engineers, makers, and small-batch manufacturers who build custom drive systems know the frustration of sourcing gears that match exact modulus and tooth count requirements. These flat plain straight spur gears are designed for builders who need dimensionally consistent, interchangeable components across a wide range of gear ratios — without custom machining.

Each metric spur gear features a pilot bore design machined from steel, available in five modulus values (2, 2.5, 3, 4, and 5 Mod) and tooth counts from 10 to 62 teeth. Pitch circle diameters range from approximately 20 mm (0.79 in) for a 2 Mod / 10T gear up to approximately 310 mm (12.2 in) for a 5 Mod / 62T gear. Face width and bore diameter vary by modulus; see variant options for confirmed dimensions.

Typical applications include DIY CNC router axis drives, 3D printer extruder and Z-axis geartrains, robotics joint actuators requiring metric spur gear sets, conveyor and indexing table drives in light industrial automation, and educational or prototyping mechanical assemblies where standard metric gearing is required.

⚙️ Compatible with standard metric gear systems. Match modulus values between mating gears — 2 Mod gears mesh only with 2 Mod gears, 2.5 Mod with 2.5 Mod, and so on. Pilot bore accepts standard metric shaft sizes; final bore machining to shaft diameter is recommended for precision fits.

✅ Key Features of These Metric Pilot Bore Spur Gears

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Wide Modulus & Tooth Count Selection — Available in 2, 2.5, 3, 4, and 5 Mod with 10 to 62 teeth, covering a broad range of gear ratios and center distances for custom drive design.

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Pilot Bore Design — Supplied with a pilot bore that can be finish-bored or reamed to your exact shaft diameter, enabling precise shaft fits without sourcing custom-bored gears.

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Standard Metric Tooth Profile — 20° pressure angle straight-cut tooth form conforms to standard metric gear geometry, ensuring correct mesh with any mating metric spur gear of the same modulus.

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Steel Construction — Machined from steel for durability in moderate-load drive applications including robotics, automation, and light industrial machinery.

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Flat Plain Face — Straight spur gear profile with flat plain face allows straightforward mounting and alignment in parallel-shaft gear trains without helical offset complications.

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Sold Individually — Each listing is for one gear. Select your required Modulus and Teeth count from the variant options above to configure your exact specification.

📐 Technical Specifications — Metric Spur Gear

Gear Type	Straight Spur Gear (Flat Plain)
Tooth Profile	Standard Metric, 20° Pressure Angle
Available Modulus	2 Mod, 2.5 Mod, 3 Mod, 4 Mod, 5 Mod
Available Tooth Count	10 – 62 Teeth
Pitch Circle Diameter Range	Approx. 20 mm – 310 mm (0.79 in – 12.2 in), varies by Mod × Teeth
Face Width	See variant options
Bore Type	Pilot Bore (finish bore to shaft size recommended)
Pilot Bore Diameter	See variant options
Material	Steel
Surface Finish	See variant options
Weight	See variant options
Quantity per Order	1 piece

❓ Frequently Asked Questions

How do I choose the correct modulus for my application?

Modulus (Mod) defines the tooth size and must match between all mating gears in a mesh. A 2 Mod gear will only mesh correctly with another 2 Mod gear. Choose a larger modulus (3, 4, or 5 Mod) for higher-torque or heavier-load applications where tooth strength is critical. Smaller modulus values (2 or 2.5 Mod) suit lighter-duty, higher-speed, or compact drive systems such as robotics joints and 3D printer drivetrains.

What is a pilot bore and do I need to machine it further?

A pilot bore is a pre-drilled center hole smaller than the intended shaft diameter. It is designed to be finish-bored, reamed, or broached to your exact shaft size and keyway specification. For precision power transmission, machining the bore to a close tolerance fit on your shaft is strongly recommended. The pilot bore allows flexibility — one gear can be adapted to multiple shaft sizes.

How do I calculate the center distance between two meshing gears?

Center distance = (Modulus × (Teeth on Gear 1 + Teeth on Gear 2)) ÷ 2. For example, a 3 Mod / 20T gear meshing with a 3 Mod / 30T gear gives a center distance of (3 × (20 + 30)) ÷ 2 = 75 mm. Both gears must share the same modulus for this formula to apply.

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

These steel spur gears are suited for moderate-load applications typical of robotics, automation equipment, CNC machines, and light industrial drives. For very high-speed or heavy industrial torque loads, consult the specific load ratings for your chosen modulus and tooth count. Larger modulus gears (4 Mod, 5 Mod) offer greater tooth strength for higher torque. Contact us to confirm suitability for your specific load conditions.

What corrosion resistance do these gears offer?

These gears are manufactured from steel. Surface finish and any protective coating vary by variant — see variant options for confirmed details. For environments with moisture or mild chemical exposure, applying a suitable gear lubricant or protective coating after installation is recommended to extend service life.

Can I use these gears with imperial (inch) shaft sizes?

These are metric-standard gears with metric tooth profiles and pilot bores. While the pilot bore can be machined to accommodate imperial shaft diameters, the gear tooth geometry (modulus) is metric and will not mesh correctly with imperial diametral pitch (DP) gears. Ensure all mating gears in your system use the same metric modulus standard.

Is lubrication required, and what type is recommended?

Lubrication is recommended for all spur gear drives to reduce wear and noise. For light-duty and robotics applications, a lithium-based grease or light gear oil applied to the tooth flanks is typically sufficient. For higher-load or continuous-duty applications, consult a gear lubrication guide for your specific load, speed, and environment conditions.

🛒 Select your Modulus and Teeth count above, then add to cart.