1 Mod 25-27 Teeth Spur Gears Transmission Gear With Step Motor Pinion Gears

Roll over image to zoom in Click on image to zoom

1 Mod 25-27 Teeth Spur Gears Transmission Gear With Step Motor Pinion Gears

HomeDIYer

No reviews

By HomeDIYer®

Choose Model: 1M 25T

Bore: 5mm (Blue Nylon)

Packing Quantity: 1 pcs

Price:

$13.59 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

Share this product

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

DIY Expert Support

Get fitment advice & recommendations

Mon–Fri 8:30 AM – 8:00 PM

WhatsApp Email Us

24-Hour Fast Ship

Arrives in 3–14 Days

Worldwide Shipping

30-Day Returns

1 tree planted with every purchase

1 Mod 25–27 Tooth Spur Gears — Precision Pinion Gears for Stepper Motor Drives

When your CNC router, 3D printer, or automation rig demands repeatable, low-backlash motion, a mismatched or worn pinion gear is the first thing to fail. These 1 Mod 25–27 Tooth Spur Gears are engineered for makers, robotics builders, and small-machine integrators who need a direct-fit pinion for NEMA-series stepper motors without custom machining.

Each gear is machined to Module 1 (1M) pitch and is available in 25T, 26T, or 27T tooth counts. Material options include lightweight blue nylon (PA66) and corrosion-resistant stainless steel. Bore diameters range from 5 mm to 16 mm (approx. 0.197″–0.630″), with standard round bores, D-flat bores, step bores (20 mm and 22 mm hub step), and keyway bores (3×1.4 mm, 4×1.8 mm, 5×2.3 mm) to suit a wide range of shaft configurations. Tooth thickness options of 10 mm are available on select large-bore variants.

Typical use cases include direct-drive pinion gears for NEMA 17/23 stepper motor shafts in CNC plasma tables, spur gear reduction stages in small conveyor systems, and replacement transmission gears in desktop automation and pick-and-place machines. Long-tail applications: "1 mod stepper motor pinion gear," "module 1 spur gear 25 tooth nylon," "stainless steel pinion gear 6mm bore."

⚙️ Compatible with Module 1 (1M) gear systems. Verify shaft diameter and bore type before ordering. D-bore and keyway variants require matching shaft flat/keyway dimensions.

✅ Key Features of These 1 Mod Spur Gears

🔩 Module 1 Pitch — Direct Mesh Compatibility
Standard 1M tooth profile ensures accurate meshing with any Module 1 rack, pinion, or mating gear in your drivetrain without modification.
🎯 Three Tooth Counts: 25T, 26T, 27T
Fine-tune your gear ratio by selecting 25, 26, or 27 teeth. Useful for adjusting output speed and torque in stepper-driven linear motion systems.
🧲 Dual Material Options — Nylon or Stainless Steel
Blue nylon (PA66) offers quiet, lightweight operation ideal for 3D printers and light automation. Stainless steel variants deliver higher load capacity and corrosion resistance for demanding environments.
📐 Wide Bore Range with Multiple Bore Types
Round bores (5–16 mm), D-flat bores (5×4.5 mm to 12×11 mm), step bores (20 mm and 22 mm hub), and keyway bores (3×1.4 mm, 4×1.8 mm, 5×2.3 mm) cover virtually every stepper motor shaft configuration.
📦 Single or 5-Pack Quantity Options
Order one piece for prototyping or a 5-pack for production builds and spare-parts inventory — both options available across all model and bore combinations.
🔄 Step Bore Design for Secure Motor Shaft Seating
Step bore variants (Step 20 mm / Step 22 mm) provide a positive axial stop against the motor face, reducing gear walk and improving concentricity on NEMA stepper shafts.

📐 Technical Specifications — 1 Mod Spur Gears

Gear Module	1M (Module 1)
Available Tooth Counts	25T, 26T, 27T
Material Options	Blue Nylon (PA66) / Stainless Steel
Bore Types	Round bore, D-flat bore, Step bore (20 mm / 22 mm), Keyway bore (3×1.4 mm, 4×1.8 mm, 5×2.3 mm)
Bore Diameter Range	5 mm – 16 mm (approx. 0.197″ – 0.630″)
Tooth Thickness	See variant options (standard or 10 mm thick on select variants)
Pitch Diameter (25T)	25 mm (approx. 0.984″)
Pitch Diameter (26T)	26 mm (approx. 1.024″)
Pitch Diameter (27T)	27 mm (approx. 1.063″)
Pressure Angle	20° (standard)
Packing Quantity	1 pcs or 5 pcs
Weight	See variant options

❓ Frequently Asked Questions

How do I choose between 25T, 26T, and 27T?

The tooth count determines your gear ratio when meshed with a rack or mating gear. A 25T pinion on a Module 1 rack moves 25 mm per full revolution; 26T moves 26 mm; 27T moves 27 mm. Choose a higher tooth count for slightly more linear travel per motor step, or a lower count for finer resolution. For most NEMA 17 direct-drive CNC builds, 25T is the most common starting point.

What is the difference between a round bore, D-bore, step bore, and keyway bore?

A round bore is a plain cylindrical hole — typically secured with a set screw. A D-bore has one flat side matching a D-shaft, providing positive rotational engagement without a set screw. A step bore has a reduced-diameter section that seats against the motor face for axial positioning. A keyway bore includes a rectangular slot for a standard key, offering the highest torque transmission. Match the bore type to your motor shaft profile.

Will the stainless steel version handle higher loads than the nylon version?

Yes. Stainless steel gears offer significantly higher tensile strength, load capacity, and wear resistance compared to blue nylon (PA66). Nylon gears are quieter, lighter, and self-lubricating — suitable for light-duty automation, 3D printers, and low-torque applications. Stainless steel is recommended for higher-torque stepper motors, outdoor environments, or applications where dimensional stability under load is critical.

Are these gears corrosion-resistant?

The stainless steel variants offer good corrosion resistance suitable for humid or mildly corrosive environments. Blue nylon gears are inherently non-corrosive and unaffected by most common lubricants and mild chemicals. Neither variant is rated for immersion in strong acids or salt spray without additional protection. For outdoor or marine use, stainless steel is the recommended choice.

What stepper motor shaft sizes are compatible?

These gears cover bore diameters from 5 mm to 16 mm, accommodating the most common NEMA stepper motor shaft sizes: NEMA 17 (5 mm shaft), NEMA 23 (6.35 mm or 8 mm shaft), and NEMA 34 (12 mm or 14 mm shaft). D-bore variants are available for 5×4.5 mm through 12×11 mm D-shafts. Always verify your motor's shaft diameter and flat dimension before selecting a variant.

Can I use these gears with a Module 1 rack for linear motion?

Yes. All variants in this listing are Module 1 (1M) pitch, which meshes directly with any standard Module 1 rack. This is the most common configuration for CNC router gantries, laser cutter axes, and linear actuators driven by stepper or servo motors. Ensure the rack's pressure angle matches (20° standard) for smooth, low-backlash engagement.

Should I order 1 pcs or 5 pcs?

The 1-piece option is ideal for prototyping, single-axis builds, or replacement of a single worn gear. The 5-piece pack offers a per-unit cost saving and is recommended for multi-axis machines (e.g., X+Y+Z CNC), production runs, or keeping spares on hand. Both options are available across all model and bore combinations.

🛒 Select your tooth count, bore size, and packing quantity above, then add to cart.