1 Mod 28-30 Teeth Spur Gears Transmission Gear With Step Motor Pinion Gears

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1 Mod 28-30 Teeth Spur Gears Transmission Gear With Step Motor Pinion Gears

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Choose Model: 1M 28T

Bore: 5mm (Blue Nylon)

Packing Quantity: 1 pcs

Price:

$14.57 USD

Stock:

In stock (500 units), ready to be shipped

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1 Mod 28–30 Teeth Spur Gears — Precision Transmission for Step Motor Pinion Drives

When your DIY automation project demands reliable torque transfer without backlash headaches, finding a spur gear that fits your shaft and motor spec can be frustrating. These 1 Mod 28–30 teeth spur gears are engineered for makers, robotics builders, and small-machine designers who need a drop-in pinion solution that mates cleanly with standard 1-module gear trains.

Each gear is machined to a 1 Module (1M) tooth profile with tooth counts of 28T, 29T, or 30T. Two material options are available: Blue Nylon for lightweight, low-noise applications, and Stainless Steel for corrosion-resistant, higher-load environments. Bore options span 4 mm to 17 mm (~0.16" to 0.67"), with round bore, D-bore, and keyed (set-screw) configurations to suit a wide range of shaft styles.

Typical use cases include stepper motor pinion drives in CNC routers and 3D printer extruder assemblies, small conveyor and indexing table gear trains, and educational robotics platforms requiring interchangeable 1M module gears. The 5-pack option suits prototyping runs or multi-axis builds where identical gears are needed across several axes.

⚙️ Compatibility: Designed for standard 1 Module (1M) gear systems. Mates with any 1M rack, pinion, or mating gear. Verify bore diameter and bore style (round / D-bore / keyed) against your shaft before ordering.

✅ Key Features of These 1 Mod Spur Gears

🦷

28T / 29T / 30T Tooth Options

Three tooth-count variants let you fine-tune gear ratio in a 1M drivetrain without changing center distance significantly.

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Multiple Bore Styles

Round bore, D-bore, and keyed (set-screw) configurations available — choose the style that matches your motor shaft or output shaft.

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Blue Nylon or Stainless Steel

Blue Nylon offers quiet, lightweight operation ideal for low-load robotics; Stainless Steel delivers strength and corrosion resistance for demanding environments.

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Wide Bore Range: 4–17 mm

Bore sizes from 4 mm to 17 mm (~0.16"–0.67") cover most stepper motor shaft diameters, including common 5 mm, 6.35 mm (1/4"), 8 mm, and 10 mm shafts.

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1-Piece or 5-Pack Quantities

Order a single gear for a quick replacement or a 5-pack for multi-axis builds and prototyping — both options available for every bore/material combination.

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Standard 1M Module Profile

Fully interchangeable with any standard 1 Module gear, rack, or pinion — no custom tooling required for integration into existing 1M gear trains.

📐 Technical Specifications — 1 Mod Spur Gears

Module	1M (1 Module)
Tooth Count	28T / 29T / 30T (see variant options)
Pressure Angle	20°
Bore Diameter	4 mm – 17 mm (see variant options)
Bore Style	Round bore / D-bore / Keyed (set-screw) — see variant options
Material	Blue Nylon / Stainless Steel (see variant options)
Gear Type	Spur Gear (Pinion)
Outer Diameter	See variant options
Face Width	See variant options
Packing Quantity	1 pcs / 5 pcs (see variant options)
Surface Finish	Natural (Nylon) / Polished (Stainless Steel)

❓ Frequently Asked Questions

How do I choose between 28T, 29T, and 30T?

The tooth count affects your gear ratio when paired with a mating gear or rack. A 28T pinion gives a slightly higher ratio (more torque, less speed) compared to a 30T pinion when driving the same mating gear. For most stepper motor pinion applications the difference is small — choose based on the ratio your drivetrain requires. All three share the same 1M module and are interchangeable in center-distance terms.

What is the difference between Blue Nylon and Stainless Steel versions?

Blue Nylon gears are lightweight, run quietly, and are self-lubricating — ideal for 3D printers, light robotics, and educational projects where noise and weight matter. Stainless Steel gears handle higher loads, resist corrosion, and are suited for industrial or outdoor environments. Stainless Steel variants are priced higher due to material and machining costs.

Which bore style should I choose — round, D-bore, or keyed?

Round bore is the most common and works with a set-screw to grip the shaft. D-bore (flat on one side) provides positive anti-rotation without a set-screw and is popular on stepper motor shafts that already have a flat. Keyed bores (e.g., 8mm 3×1.4mm, 10mm 4×1.8mm) accept a standard key for high-torque, slip-free connections. Match the bore style to your motor or shaft specification.

Will this gear fit my stepper motor shaft?

Most NEMA 17 stepper motors use a 5 mm shaft; NEMA 23 motors commonly use 6.35 mm (1/4") or 8 mm shafts. Check your motor's datasheet for shaft diameter and flat (D-cut) dimensions, then select the matching bore size and style from the variant options. If your shaft has a flat, choose the D-bore variant for the best fit.

Are these gears compatible with standard 1M racks and mating gears?

Yes. These gears follow the standard 1 Module (1M) tooth profile with a 20° pressure angle, making them fully interchangeable with any 1M rack, pinion, or mating spur gear from any manufacturer. No special tooling or adapters are required.

How strong are the Stainless Steel gears — can they handle continuous duty?

Stainless Steel spur gears are suitable for continuous-duty applications at moderate loads typical of small CNC machines, indexing tables, and light conveyor systems. Exact load ratings depend on tooth count, speed, and lubrication. For very high-torque or high-speed applications, confirm the gear's rated torque against your system requirements before ordering.

Do the Stainless Steel gears resist rust in humid or outdoor environments?

Yes. Stainless Steel provides good corrosion resistance in humid, wet, or mildly corrosive environments. For highly aggressive chemical environments, additional protective measures may be needed. Blue Nylon gears are inherently non-corrosive and also perform well in damp conditions at lower load levels.

🛒 Select your Model (tooth count), Bore size, and Packing Quantity above, then add to cart.