0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel
0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel
0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel
0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel
0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel
0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel
0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel
0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel
0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel
0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel
0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel
0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel
0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel
0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel
0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel
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0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel

0.5 Mod 30 Teeth Spur Gear Transmission Gear With Step Motor Gears 45# Steel

HomeDIYer
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By HomeDIYer®

Price:
$11.15 USD
Stock:
In stock (500 units), ready to be shipped

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Description

0.5 Mod 30-Tooth Spur Gear in 45# Steel — Precision Fit for Stepper Motor Drives

When your DIY automation project demands tight gear mesh and repeatable torque transfer, a poorly dimensioned gear becomes the weakest link in the chain. Makers, robotics builders, and small-workshop engineers who run stepper motor drives need a 0.5 module 30-tooth spur gear that holds tolerance under load — not one that wobbles on the shaft or strips after a few hundred cycles.

This spur gear is machined from 45# medium-carbon steel, a material known for its balanced hardness and machinability. The gear features a module of 0.5 and 30 teeth, giving a pitch diameter of 15 mm (approximately 0.59 in). Tooth thickness options are 3 mm (~0.12 in) and 5 mm (~0.20 in), and bore sizes span 4 mm, 5 mm, 6 mm, 6.35 mm (1/4 in), and 8 mm to match common stepper motor shaft diameters. Overall outer diameter is approximately 16 mm (~0.63 in).

Typical use cases include stepper motor gearboxes for CNC router Z-axis drives, compact robotic arm joint transmissions requiring low-backlash 0.5 mod gear pairs, and small conveyor or indexing table builds where a 30-tooth spur gear provides the right reduction ratio alongside a matching pinion.

⚙️ Compatibility: Designed for 0.5 module gear systems. Pairs with any 0.5 Mod mating gear or rack. Bore sizes 4 / 5 / 6 / 6.35 / 8 mm fit standard stepper motor and servo motor shaft diameters. Confirm tooth thickness (3 mm or 5 mm) matches your gear stack width before ordering.

✅ Key Features of These 0.5 Mod 30-Tooth Spur Gears

🔩 45# Steel Construction

Medium-carbon steel delivers a solid balance of tensile strength and machinability, suitable for moderate-load transmission applications in automation and robotics.

📐 0.5 Module, 30 Teeth

Standard 0.5 Mod tooth profile ensures interchangeability with any matching 0.5 Mod gear or rack. 30 teeth yield a 15 mm pitch diameter for compact drive trains.

🎯 Multiple Bore Options

Available in 4 mm, 5 mm, 6 mm, 6.35 mm (1/4 in), and 8 mm bores to fit the most common stepper motor and servo shaft diameters without custom machining.

📏 Two Tooth Thickness Choices

Select 3 mm or 5 mm tooth thickness to match your gear stack depth. Thicker teeth (5 mm) handle higher axial loads; 3 mm suits space-constrained assemblies.

📦 Flexible Pack Quantities

Order 1, 2, 3, 4, 5, 8, or 10 pieces per transaction. Stock up for multi-axis builds or prototype runs without overpaying for single-unit pricing.

🔄 Drop-In Replacement Ready

Standardized 0.5 Mod tooth geometry means this gear slots directly into existing 0.5 Mod gear trains as a replacement or upgrade without system redesign.

📐 Technical Specifications — 0.5 Mod Spur Gear

Module 0.5
Number of Teeth 30T
Pitch Diameter 15 mm (0.59 in)
Outer Diameter (approx.) 16 mm (0.63 in)
Tooth Thickness 3 mm or 5 mm (see variant options)
Bore Diameter 4 / 5 / 6 / 6.35 / 8 mm (see variant options)
Material 45# Medium-Carbon Steel
Pressure Angle 20°
Gear Type Spur Gear
Surface Finish See variant options
Packing Quantity 1 / 2 / 3 / 4 / 5 / 8 / 10 pcs (see variant options)

❓ Frequently Asked Questions

How do I choose between the 3 mm and 5 mm tooth thickness?

Tooth thickness (also called face width) determines how much load the gear can carry axially. Choose 3 mm if your build has limited axial space or if the gear is lightly loaded — common in small robotic joints or sensor-driven axes. Choose 5 mm when the gear must transmit higher torque or when you want extra durability in continuous-duty applications such as CNC feed drives or conveyor indexers.

Which bore size fits a standard NEMA 17 stepper motor shaft?

Most NEMA 17 stepper motors ship with a 5 mm output shaft. Select the Bore 5 variant for a direct fit. If your motor has a D-flat shaft, you may need to add a set screw or use a shaft coupler after mounting. The 6.35 mm (1/4 in) bore suits many servo motors and imperial-spec shafts.

Is 45# steel corrosion-resistant?

45# medium-carbon steel is not inherently stainless. It will oxidize if exposed to moisture over time. For indoor automation, robotics, or dry workshop environments this is not typically an issue. If your application involves humidity or occasional water exposure, apply a light machine oil or consider a protective coating after installation.

What mating gear or rack is compatible with this 0.5 Mod gear?

Any gear or rack with a 0.5 module and a 20° pressure angle will mesh correctly with this gear. The mating gear tooth count determines your gear ratio — for example, pairing this 30T gear with a 15T pinion gives a 2:1 reduction. Ensure the face width of the mating gear is equal to or greater than the tooth thickness you select.

Can I use this gear with a 6.35 mm (1/4 inch) shaft from a US-spec motor?

Yes. The 6.35 mm bore variant is specifically sized for 1/4-inch imperial shafts common on many US-market servo motors and small DC gearmotors. This eliminates the need for a bushing or adapter in most cases.

How do I decide how many pieces to order?

For a single-axis prototype, 1 or 2 pcs is sufficient. Multi-axis CNC machines or robotic arms with 3–6 joints typically need 4–8 gears of the same spec. Ordering in larger packs (8 or 10 pcs) reduces the per-unit cost and ensures you have spares on hand for maintenance or future builds. Check the variant pricing — bulk packs offer a lower per-piece rate.

What is the pressure angle of this spur gear?

This gear uses the industry-standard 20° pressure angle, which is the most common profile for metric module spur gears. It provides a good balance between tooth strength and smooth meshing. Ensure your mating gear also uses a 20° pressure angle for correct engagement.

Can this gear be used in a 3D printer extruder or motion system?

Yes. 0.5 Mod 30T spur gears are used in compact extruder gear trains and motion systems where a small pitch diameter and fine tooth profile are needed. The 45# steel construction is more durable than the plastic gears found in many stock extruders, making this a solid upgrade for high-cycle or high-temperature printing environments.

🛒 Select your Size (mm) and Packing Quantity above, then add to cart.

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