1/1.5/2/2.5/3/4/5 Mod Spur Gear 10T - 50T Flat Gear Transmission Gears 45# Steel

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1/1.5/2/2.5/3/4/5 Mod Spur Gear 10T - 50T Flat Gear Transmission Gears 45# Steel

Name: 1/1.5/2/2.5/3/4/5 Mod Spur Gear 10T - 50T Flat Gear Transmission Gears 45# Steel
Brand: HomeDIYer
Price: 3.43 USD
Availability: InStock

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By HomeDIYer®

Gear Module: 1 Mod

Number of teeth: 12T

Packing QTY (Piece): 1 PCS

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$3.43 USD

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In stock (500 units), ready to be shipped

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Mod Spur Gear 10T–50T — Reliable Flat Gear Transmission in 45# Steel

When your DIY automation project, robotics build, or CNC machine demands consistent torque transfer without slippage, finding a spur gear that holds its geometry under load is the real challenge. These flat spur gears are engineered for makers, small workshop operators, and engineering students who need a dependable mechanical drive component they can drop straight into a gear train without custom machining.

Each gear is machined from 45# medium-carbon steel, a material known for its balanced hardness and machinability. The tooth profile follows standard metric module sizing — available in 1 Mod, 1.5 Mod, 2 Mod, 2.5 Mod, 3 Mod, 4 Mod, and 5 Mod — with tooth counts ranging from 10T to 50T (10T and 11T available from 2 Mod and above). Outer diameter scales with module and tooth count per standard gear geometry (OD = (Z + 2) × m), typically ranging from approximately 12 mm (0.47 in) for a 1 Mod 10T up to approximately 260 mm (10.2 in) for a 5 Mod 50T.

These spur gears suit a wide range of applications: speed-reduction gear trains in tabletop CNC routers, torque-multiplying drive stages in DIY conveyor systems, and educational gear mechanism demonstrations in robotics labs. Their flat face profile makes them straightforward to align on parallel shafts, and the metric module standard ensures interchangeability with other module-matched gears across your build.

⚙️ Compatibility: Meshes with any spur or rack gear of the same module (Mod). Bore diameter varies by variant — see variant options or contact us to confirm bore size before ordering.

✅ Key Features of These Mod Spur Gears

🔩 45# Carbon Steel Construction

Machined from 45# medium-carbon steel for a solid balance of surface hardness, tensile strength, and resistance to tooth deformation under cyclic load — suitable for moderate-duty mechanical drives.

📐 Standard Metric Module Sizing

Available in 1, 1.5, 2, 2.5, 3, 4, and 5 Mod. Standard module sizing means these gears mesh directly with any same-module spur gear or rack, simplifying gear train design and part sourcing.

🔢 Wide Tooth Count Range (10T – 50T)

Select from 10 to 50 teeth to dial in your desired gear ratio. A broader tooth count range gives you more flexibility to achieve target output speeds and torques without custom fabrication.

⚖️ Flat Face Profile for Easy Alignment

The flat spur gear face simplifies shaft alignment on parallel axes. No helical offset to manage — straightforward to mount, align, and replace in open gear train configurations.

🔄 Consistent Tooth Geometry

Teeth are cut to standard involute profile geometry, ensuring smooth engagement, predictable backlash, and even load distribution across the tooth face during operation.

🛠️ Machinable for Custom Bore Sizing

45# steel machines cleanly, making it practical to bore, key, or set-screw the hub to your specific shaft diameter in a lathe or drill press if the stock bore does not match your shaft.

📐 Technical Specifications — Mod Spur Gear

Material	45# Medium-Carbon Steel
Gear Type	Spur Gear (Flat Face, Parallel Axis)
Tooth Profile	Standard Involute
Available Modules	1 Mod / 1.5 Mod / 2 Mod / 2.5 Mod / 3 Mod / 4 Mod / 5 Mod
Tooth Count Range	10T – 50T (10T & 11T from 2 Mod and above)
Outer Diameter	See variant options (OD = (Z + 2) × Module)
Bore Diameter	See variant options
Hub / Face Width	See variant options
Pressure Angle	20°
Finish	Natural steel (uncoated)
Packing Quantity	1 piece per order

❓ Frequently Asked Questions

How do I choose the right module (Mod) for my project?

The module defines the tooth size and must match between all meshing gears. Larger modules (e.g., 4 Mod, 5 Mod) have bigger, stronger teeth suited for higher torque applications. Smaller modules (e.g., 1 Mod, 1.5 Mod) have finer teeth suited for compact, lower-torque gear trains. Match the module to your existing gear train or select based on the torque and space requirements of your build.

How do I calculate the gear ratio using tooth count?

Gear ratio = driven gear teeth ÷ driving gear teeth. For example, pairing a 15T driving gear with a 45T driven gear gives a 3:1 reduction ratio — the output shaft turns at one-third the input speed with three times the torque. Use the 10T–50T range available here to build a wide variety of ratios.

Will these gears mesh with gears from other suppliers?

Yes, provided the other gears share the same module and pressure angle (20°). Standard metric module spur gears follow ISO/DIN involute tooth geometry, so same-module gears from different sources will mesh correctly. Always verify the module and pressure angle before mixing gears from different sources.

What is the bore diameter, and can I modify it?

Bore diameter varies by module and tooth count — please see the variant options or contact us to confirm the bore size for your specific selection. Because these gears are machined from 45# steel, the bore can be enlarged on a lathe or drill press to fit a larger shaft diameter if needed. Set-screw or keyway modifications are also practical with this material.

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

These gears are suited for moderate-duty applications typical of DIY automation, robotics, and light industrial prototyping. 45# steel provides adequate strength for most maker and small-workshop use cases. For continuous high-speed or heavy industrial loads, consider heat-treated or hardened steel gears and consult an engineer for load calculations.

Do these gears require lubrication?

Yes, lubrication is recommended for any metal-on-metal gear mesh to reduce wear and noise. A light machine oil or gear grease applied to the tooth faces at installation and periodically during operation will extend service life. The frequency depends on load, speed, and operating environment.

How do I determine the outer diameter before ordering?

For standard spur gears, outer diameter (OD) = (tooth count + 2) × module. For example, a 2 Mod gear with 20 teeth has an OD of (20 + 2) × 2 = 44 mm (approximately 1.73 in). Use this formula to verify the gear will fit your available space before ordering.

🛒 Select your Gear Module and Number of Teeth above, then add to cart.

1/1.5/2/2.5/3/4/5 Mod Spur Gear 10T - 50T Flat Gear Transmission Gears 45# Steel

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Description

Mod Spur Gear 10T–50T — Reliable Flat Gear Transmission in 45# Steel

✅ Key Features of These Mod Spur Gears

📐 Technical Specifications — Mod Spur Gear

❓ Frequently Asked Questions

1/1.5/2/2.5/3/4/5 Mod Spur Gear 10T - 50T Flat Gear Transmission Gears 45# Steel

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