1 Mod 31-35 Teeth Spur Gears Transmission Gear With Step Motor Pinion Gears

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1 Mod 31-35 Teeth Spur Gears Transmission Gear With Step Motor Pinion Gears

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Choose Model: 1M 31T

Bore: 6mm

Packing Quantity: 1 pcs

Price:

$15.54 USD

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In stock (500 units), ready to be shipped

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1 Mod 31–35 Teeth Spur Gears — Precision Transmission for Stepper Motor Drives

When your CNC router skips steps, your 3D printer loses position, or your DIY robot arm stutters under load, the culprit is often a mismatched or worn pinion gear. These 1 Mod 31–35 teeth spur gears are engineered for makers, hobbyists, and small-workshop builders who need reliable, repeatable motion transfer between stepper motors and driven shafts — without the guesswork of custom machining.

Each gear is machined to Module 1 (1M) standard with tooth counts of 31T, 32T, 33T, 34T, or 35T. Bore options span 6 mm to 17 mm (approximately 0.24 in to 0.67 in), including round bores, keyway bores (e.g., 3×1.4 mm, 4×1.8 mm, 5×2.3 mm), and D-flat bores for positive shaft engagement. Materials include carbon steel (standard), 304 stainless steel for corrosion-resistant environments, and blue nylon for lightweight, low-noise applications. Outer diameter ranges typically from approximately 33 mm to 37 mm (1.30 in to 1.46 in) depending on tooth count.

Typical use cases include stepper motor pinion drives in desktop CNC machines, extruder gear trains in FDM 3D printers, rotary axis drives in laser engravers, and gear reduction stages in DIY robotic joints. The wide bore selection makes these gears a practical drop-in solution for 1 Mod spur gear transmission systems across a broad range of shaft diameters.

⚙️ Compatibility: Module 1 (1M) standard — meshes with any 1 Mod rack, pinion, or mating gear. Verify bore diameter and keyway spec against your shaft before ordering.

✅ Key Features of These 1 Mod Spur Gears

🔩

Module 1 Standard Tooth Profile

31T to 35T options provide fine gear ratio tuning for stepper motor pinion applications with consistent 1M pitch compatibility.

🎯

Multiple Bore Styles

Round bore (6–17 mm), keyway bore (3×1.4 mm, 4×1.8 mm, 5×2.3 mm), and D-flat bore options ensure secure shaft engagement without slipping.

🛡️

Three Material Options

Carbon steel for general-purpose torque transmission, 304 stainless steel for moisture-prone or food-adjacent environments, and blue nylon for quiet, lightweight drives.

📦

Single or 5-Pack Quantities

Order 1 pc for prototyping or replacement, or 5 pcs for production builds and spare inventory — both options available across most model/bore combinations.

📐

Consistent Dimensional Accuracy

Machined to Module 1 spec with controlled bore tolerances, enabling reliable mesh with standard 1M racks and mating gears in precision motion systems.

⚡

Stepper Motor Ready

Bore sizes align with common NEMA 17 and NEMA 23 stepper motor shaft diameters (5 mm, 6.35 mm, 8 mm), making these gears a direct-fit pinion solution for DIY CNC and robotics.

📐 Technical Specifications — 1 Mod Spur Gears

Module	1 (1M)
Tooth Count	31T, 32T, 33T, 34T, 35T
Pressure Angle	20°
Bore Diameter	6 mm – 17 mm (round, keyway, D-flat); see variant options
Outer Diameter (approx.)	33 mm – 37 mm (1.30 in – 1.46 in); varies by tooth count
Face Width	See variant options
Material	Carbon Steel / 304 Stainless Steel / Blue Nylon; see variant options
Bore Style	Round bore / Keyway bore / D-flat bore; see variant options
Gear Type	External spur gear
Packing Quantity	1 pcs or 5 pcs; see variant options
Surface Finish	See variant options

❓ Frequently Asked Questions

How do I choose the right tooth count (31T–35T) for my application?

The tooth count determines your gear ratio when paired with a pinion or mating gear. A 31T gear paired with a 10T pinion gives a 3.1:1 reduction; a 35T gear gives 3.5:1. Choose a higher tooth count for more torque and slower output speed, or a lower count for faster output. For stepper motor drives, match the tooth count to your desired steps-per-mm or degrees-per-step calculation.

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

A round bore is a plain cylindrical hole — typically secured with a set screw or press fit. A keyway bore (e.g., 8mm with 3×1.4mm keyway) includes a rectangular slot that accepts a matching key on the shaft, providing positive rotational engagement and preventing slipping under load. A D-flat bore has one flat side machined into the bore, matching a D-shaft (common on many stepper motors) for a secure, no-slip fit without a separate key. Choose based on your shaft type.

Which material should I choose — carbon steel, stainless steel, or blue nylon?

Carbon steel offers the best strength-to-cost ratio for general indoor automation, CNC, and robotics applications. Choose 304 stainless steel if your application involves moisture, humidity, mild chemicals, or food-adjacent environments where corrosion resistance is needed. Blue nylon is ideal for lightweight, low-noise, low-torque applications such as small 3D printer extruder drives or sensor positioning systems — it also reduces wear on mating metal gears.

Will these gears mesh with my existing 1 Mod rack or gear?

Yes — all gears in this listing are Module 1 (1M) with a standard 20° pressure angle, which is the most common metric gear standard. They will mesh correctly with any other 1M spur gear, rack, or pinion of the same module and pressure angle, regardless of tooth count. Confirm that your existing components are also Module 1 before ordering.

What stepper motor shaft sizes are compatible with these bore options?

Common stepper motor shaft diameters are 5 mm (many small NEMA 17 motors), 6.35 mm (1/4 inch, common on some NEMA 17 and NEMA 23), and 8 mm (standard NEMA 23). This listing covers 6 mm, 6.35 mm, 7 mm, 8 mm, 10 mm, 12 mm, 12.7 mm, 14 mm, 15 mm, 16 mm, and 17 mm bores, as well as D-bore and keyway variants. Check your motor's datasheet for the exact shaft diameter and flat dimension before selecting a variant.

Can I use these gears outdoors or in wet environments?

Carbon steel variants are not recommended for prolonged outdoor or wet exposure without additional protective coating, as they can oxidize over time. For outdoor, marine, or high-humidity environments, select the 304 Stainless Steel variants, which offer significantly better corrosion resistance. Blue nylon variants are also moisture-resistant but are limited to lower torque and temperature ranges.

Should I order 1 pcs or 5 pcs?

Order 1 pc if you need a single replacement gear or are prototyping a new design and want to verify fit before committing. Order 5 pcs if you are building multiple units, running a small production batch, or want to keep spares on hand for maintenance. The 5-pack pricing offers a per-unit discount compared to buying five individual pieces separately.

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