1.5-2 Mod Steel Spur Gear 25-35T Bore 6-30mm Pinion Gear with Step Motor Gear

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1.5-2 Mod Steel Spur Gear 25-35T Bore 6-30mm Pinion Gear with Step Motor Gear

Name: 1.5-2 Mod Steel Spur Gear 25-35T Bore 6-30mm Pinion Gear with Step Motor Gear
Brand: HomeDIYer
Price: 21.73 USD
Availability: InStock

HomeDIYer

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By HomeDIYer®

Modulus: 1.5 Modulus

Number of Gear Tooth: 28 Teeth

Bore Diameter(mm) & Amount: 6 mm & 1 PCS

Price:

$21.73 USD

Stock:

In stock (500 units), ready to be shipped

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Steel Spur Gear Mod 1.5 & 2 — Precision Pinion Gear for Stepper Motors and Mechanical Drives

When a mismatched gear causes skipped steps, stripped teeth, or vibration in your motion system, the entire build stalls. Engineers, robotics builders, and CNC hobbyists who need a reliable, dimensionally consistent steel spur gear in Mod 1.5 or Mod 2 will find this pinion gear a dependable solution for both prototyping and small-batch production.

Each gear is machined from carbon steel, offering a balance of toughness and machinability suited to mechanical drive applications. The Mod 1.5 series covers 25–35 teeth with bore diameters from 6 mm (0.24 in) to 20 mm (0.79 in); the Mod 2 series covers 25–35 teeth with bore diameters from 8 mm (0.31 in) to 30 mm (1.18 in). Keyway options (4 mm, 5 mm, 6 mm, and 8 mm) are available on larger bore variants for positive shaft engagement.

Typical use cases include stepper motor pinion drives in 3D printers and CNC routers, gear reduction stages in robotic arm joints, and custom actuator assemblies requiring a compact spur gear with a standardized module pitch. The standardized module system ensures straightforward meshing with any mating gear of the same modulus.

⚙️ Compatibility: Meshes with any Mod 1.5 or Mod 2 spur gear of matching modulus. Verify bore diameter and keyway dimensions against your shaft before ordering. Suitable for stepper motors, servo shafts, and custom drive assemblies.

✅ Key Features of These Steel Spur Gears

⚙️

Dual Modulus Options
Available in Mod 1.5 and Mod 2 to match your existing gear train without custom tooling.

🔩

Wide Bore Range
Bore diameters from 6 mm to 30 mm (0.24–1.18 in) cover most stepper motor and servo shaft sizes in a single product family.

🗝️

Keyway Variants Available
Larger bore options include precision-cut keyways (4 mm, 5 mm, 6 mm, 8 mm) for positive, slip-free shaft coupling under load.

🏗️

Carbon Steel Construction
Machined from carbon steel for reliable strength in continuous-duty mechanical drive applications.

📐

Standardized Module Pitch
Module-based tooth profile ensures accurate meshing with any Mod 1.5 or Mod 2 mating gear, simplifying gear train design.

🔄

Broad Tooth Count Selection
25 to 35 teeth across both moduli allow fine-tuning of gear ratios for speed reduction or torque multiplication in your drive system.

📐 Technical Specifications — Steel Spur Gear

Material	Carbon Steel
Module (Modulus)	1.5 / 2
Number of Teeth	25 / 26 / 27 / 28 / 30 / 32 / 34 / 35
Bore Diameter	6 – 30 mm (0.24 – 1.18 in) — See variant options
Keyway	4 mm / 5 mm / 6 mm / 8 mm (bore-dependent) — See variant options
Pressure Angle	20°
Tooth Profile	Involute
Finish	See variant options
Package Quantity	1 PCS (per variant)
Application	Stepper motor drives, CNC, robotics, actuators

❓ Frequently Asked Questions

How do I choose between Mod 1.5 and Mod 2?

The modulus must match your mating gear. Mod 1.5 produces smaller, finer teeth suited to compact drives and lighter loads, while Mod 2 produces larger teeth with greater load capacity. Check the modulus stamped or specified on your existing gear or motor pinion before selecting.

What bore diameter should I select for my stepper motor shaft?

Measure your motor shaft diameter with calipers. Common NEMA 17 stepper shafts are 5 mm; NEMA 23 shafts are typically 6.35 mm or 8 mm; larger NEMA 34 motors often use 12–14 mm shafts. Choose the bore that matches your shaft, and select a keyway variant if your shaft has a keyway slot.

Do I need a keyway, or will a plain bore work?

A plain bore secured with a set screw is adequate for light-duty or low-torque applications. For higher torque, reversing loads, or applications where slippage would cause damage, a keyway variant provides a positive mechanical lock between the gear and shaft and is strongly recommended.

How strong are these steel spur gears under continuous load?

Carbon steel spur gears in this modulus range are suitable for moderate continuous-duty mechanical drives. Exact load ratings depend on tooth count, modulus, operating speed, and lubrication. For heavy industrial or high-cycle applications, consult standard gear load tables using the module and tooth count of your selected variant.

Are these gears corrosion-resistant?

Carbon steel has moderate corrosion resistance. For environments with moisture or mild chemicals, apply a light machine oil or grease to the tooth surfaces. For highly corrosive environments, consider stainless steel or plastic gears instead.

Can I use a Mod 1.5 gear with a Mod 2 gear?

No. Gears of different moduli cannot mesh correctly — the tooth pitch and profile dimensions are incompatible. Both the driving and driven gear must share the same modulus for proper engagement and load transfer.

What is a "process hole" bore option?

The "process hole" option means the gear is supplied with a pilot bore (a small center hole used during machining). You or a machinist can then bore it to your exact required diameter and add a keyway if needed. This is ideal when your shaft size falls outside the standard bore options listed.

🛒 Select your Modulus, Number of Gear Teeth, and Bore Diameter above, then add to cart.