1 Mod Spur Gear 15-40T Pinion Gear with Step Motor Gear Bore 5-14mm 45# Steel
1 Mod Spur Gear 15-40T Pinion Gear with Step Motor Gear Bore 5-14mm 45# Steel
1 Mod Spur Gear 15-40T Pinion Gear with Step Motor Gear Bore 5-14mm 45# Steel
1 Mod Spur Gear 15-40T Pinion Gear with Step Motor Gear Bore 5-14mm 45# Steel
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1 Mod Spur Gear 15-40T Pinion Gear with Step Motor Gear Bore 5-14mm 45# Steel1 Mod Spur Gear 15-40T Pinion Gear with Step Motor Gear Bore 5-14mm 45# Steel1 Mod Spur Gear 15-40T Pinion Gear with Step Motor Gear Bore 5-14mm 45# Steel1 Mod Spur Gear 15-40T Pinion Gear with Step Motor Gear Bore 5-14mm 45# Steel

1 Mod Spur Gear 15-40T Pinion Gear with Step Motor Gear Bore 5-14mm 45# Steel

HomeDIYer
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By HomeDIYer®

Price:
$14.63 USD
Stock:
In stock (500 units), ready to be shipped

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Description

1 Mod Spur Gear Pinion — Precision 45# Steel Gear for Stepper Motors & CNC Drives

When your motion-control build demands consistent torque transfer and tight mesh tolerances, undersized or poorly machined gears become the weakest link. Makers, robotics builders, and CNC hobbyists who rely on stepper motors need a 1 mod spur gear pinion that holds its bore concentricity and tooth profile under repeated load cycles — and that's exactly what this gear is designed for.

These 1 Mod spur gear pinions are machined from 45# medium-carbon steel, offering a solid balance of hardness and machinability. The module (pitch) is 1M, with tooth counts ranging from 15T to 40T and bore sizes from 5 mm (~0.197 in) to 14 mm (~0.551 in). Overall gear diameter scales with tooth count: a 15T gear measures approximately 17 mm (~0.67 in) OD, while a 40T gear reaches approximately 42 mm (~1.65 in) OD. Face width is typically 10–12 mm (~0.39–0.47 in).

Typical use cases include stepper motor pinion drives in 3D printers and laser cutters, rack-and-pinion linear motion systems for CNC routers, and compact gearbox stages in robotics arms and automated fixtures — all applications where a reliable 1 mod steel spur gear keeps the mechanism running smoothly.

⚙️ Compatibility: Meshes with any standard Module 1 (1M) spur gear, rack, or pinion. Bore fits NEMA 17 / NEMA 23 stepper motor shafts and common hobby motor shafts (5 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm). Verify shaft diameter and keyway requirements before ordering.

✅ Key Features of These 1 Mod Spur Gear Pinions

🔩 45# Medium-Carbon Steel Construction

Machined from 45# steel for a reliable combination of surface hardness and core toughness, resisting wear under continuous meshing loads in motor-driven applications.

📐 Module 1 (1M) Standard Tooth Profile

Conforms to the international Module 1 gear standard, ensuring direct interchangeability with any 1M rack, pinion, or mating spur gear in your drivetrain.

🎯 Wide Tooth Count Range: 15T – 40T

Eight tooth-count options (15T, 16T, 18T, 20T, 25T, 30T, 35T, 40T) let you dial in the exact gear ratio needed for your stepper motor or servo drive stage.

🔧 Multiple Bore Sizes: 5 – 14 mm

Available with bores of 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, and 14 mm to fit NEMA 17/23 stepper shafts and common hobby motor output shafts without additional machining.

⚡ Step-Bore Hub Design

The stepped hub profile provides a positive axial shoulder for shaft collars or set screws, keeping the gear positioned accurately on the motor shaft during operation.

🏭 Broad Application Compatibility

Suited for 3D printer extruder drives, CNC router rack-and-pinion axes, robotic arm joints, and DIY linear actuators — anywhere a compact 1 mod steel spur gear is required.

📐 Technical Specifications — 1 Mod Spur Gear Pinion

Module (Pitch) 1M (Module 1)
Tooth Count Options 15T, 16T, 18T, 20T, 25T, 30T, 35T, 40T
Bore Size Options 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm
Outer Diameter (OD) See variant options (scales with tooth count; ~17 mm for 15T to ~42 mm for 40T)
Face Width Typically 10–12 mm (0.39–0.47 in)
Hub Style Step-bore hub with set screw flat
Material 45# Medium-Carbon Steel
Finish See variant options
Pressure Angle 20°
Gear Type Spur Gear (straight tooth)
Packing Quantity 1 pc per order
Weight See variant options

❓ Frequently Asked Questions

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

Select the tooth count based on your desired gear ratio. Divide the driven gear's tooth count by the driving pinion's tooth count to get the ratio. For example, pairing a 15T pinion with a 30T gear gives a 2:1 reduction. Higher tooth counts on the pinion reduce the ratio and increase output speed; lower tooth counts increase torque multiplication.

Which bore size fits a NEMA 17 stepper motor shaft?

Standard NEMA 17 stepper motors have a 5 mm output shaft. Select the 5 mm bore variant for a direct fit. NEMA 23 motors typically use an 8 mm shaft — choose the 8 mm bore variant for those. Always verify your specific motor's datasheet before ordering.

Is 45# steel strong enough for continuous motor-driven loads?

45# medium-carbon steel provides a tensile strength of approximately 600–800 MPa, making it well-suited for moderate-duty continuous meshing in stepper motor and servo applications. For very high-torque or high-speed industrial drives, consider heat-treated or alloy steel gears. For typical CNC, 3D printer, and robotics use cases, 45# steel performs reliably.

Will this gear mesh with my existing Module 1 rack or gear?

Yes. All gears in this listing conform to the international Module 1 (1M) standard with a 20° pressure angle. They will mesh correctly with any other Module 1 spur gear, helical gear (same helix angle), or rack that also uses a 20° pressure angle. Do not mix with Module 0.8 or Module 1.25 components — modules must match for proper meshing.

Does the gear come with a set screw or keyway?

The step-bore hub is designed to accept a set screw for shaft retention. A pre-drilled and tapped set screw hole is typically included on the hub. Keyway availability varies by size — please check the product images or contact us to confirm keyway details for your specific tooth count and bore combination.

How do I prevent corrosion on these steel gears?

45# steel is not inherently stainless. For indoor or dry environments, a light coat of machine oil or grease applied during installation is sufficient. For humid or outdoor-adjacent environments, consider a corrosion-inhibiting gear grease or a protective coating such as cold bluing or clear lacquer. Regular re-lubrication extends service life significantly.

Can I order multiple tooth counts or bore sizes in one purchase?

Each variant (Size + Bore Size combination) is sold individually as 1 pc per order. To purchase multiple configurations, simply add each desired variant to your cart separately. Bulk pricing may be available — contact us for volume inquiries.

🛒 Select your Size (tooth count) and Bore Size above, then add to cart.

 

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