0.5 Mod 22 Teeth Spur Gear Bore 4/5/6mm Motor Gears Transmission Gears 45# Steel

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0.5 Mod 22 Teeth Spur Gear Bore 4/5/6mm Motor Gears Transmission Gears 45# Steel

Name: 0.5 Mod 22 Teeth Spur Gear Bore 4/5/6mm Motor Gears Transmission Gears 45# Steel
Brand: HomeDIYer
Price: 10.23 USD
Availability: InStock

HomeDIYer

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By HomeDIYer®

Size: 0.5M 22T, Bore 4mm

Packing Quantity: 1 pcs

Price:

$10.23 USD

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In stock (500 units), ready to be shipped

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0.5 Mod 22-Tooth Spur Gear — Precision Steel Drive Gear for Small Motors & DIY Automation

When your small motor drive slips, strips, or simply lacks a reliable mating gear, finding a dimensionally accurate replacement in the right bore size becomes a real bottleneck. Whether you are a maker building a tabletop robot, an engineer prototyping a compact gearbox, or a hobbyist assembling a motorized mechanism, you need a spur gear that fits your shaft precisely and meshes cleanly with your existing drivetrain.

These 0.5 module 22-tooth spur gears are machined from 45# carbon steel, offering a solid balance of strength and machinability. The module 0.5 pitch gives a tooth pitch of approximately 1.571 mm (0.062 in), with an outer diameter of approximately 11.5 mm (0.453 in) and a face width typically in the 5–8 mm (0.197–0.315 in) range. Bore options of 4 mm, 5 mm, and 6 mm cover the most common small motor shaft diameters used in DIY and light industrial applications.

Typical use cases include small DC motor gearboxes for robotics and automation rigs, replacement transmission gears in 3D printer extruder drives, and compact gear trains in educational STEM kits or science fair projects requiring reliable 0.5 mod gear meshing.

⚙️ Compatible with all standard Module 0.5 gear systems. Verify your shaft diameter before selecting bore size: 4 mm / 5 mm / 6 mm.

✅ Key Features of These 0.5 Mod 22-Tooth Spur Gears

🔩45# Carbon Steel Construction

Machined from 45# medium-carbon steel for reliable strength in light-to-medium load transmission applications without excessive weight.

📐Module 0.5 Precision Tooth Profile

Standard 0.5 mod involute tooth geometry ensures smooth, low-noise meshing with any other Module 0.5 compatible gear in your drivetrain.

🎯Three Bore Sizes: 4 / 5 / 6 mm

Select the bore that matches your motor shaft diameter exactly — no adapters or bushings required for standard small motor shafts.

⚡22-Tooth Count for Compact Ratios

22 teeth on a 0.5 mod gear delivers a compact outer diameter ideal for tight-clearance gearbox designs and miniature drive assemblies.

📦Flexible Pack Quantities

Available in packs of 1, 2, 3, 4, 5, 8, or 10 pieces — order exactly what your project requires, from single replacements to small production runs.

🔄Drop-In Replacement Compatibility

Dimensionally consistent with standard 0.5 mod gear specifications, making these a reliable drop-in replacement for worn or damaged gears in existing assemblies.

📐 Technical Specifications — 0.5 Mod Spur Gear

Module	0.5
Number of Teeth	22T
Bore Diameter	4 mm / 5 mm / 6 mm (see variant options)
Outer Diameter (OD)	Approx. 11.5 mm (0.453 in)
Tooth Pitch	Approx. 1.571 mm (0.062 in)
Face Width	See variant options
Pressure Angle	20°
Material	45# Carbon Steel
Finish	See variant options
Gear Type	Spur Gear
Pack Quantity	1 / 2 / 3 / 4 / 5 / 8 / 10 pcs (see variant options)

❓ Frequently Asked Questions

How do I choose the right bore size for my motor shaft?

Measure your motor shaft diameter with a caliper. This gear is available in 4 mm, 5 mm, and 6 mm bore sizes. Select the bore that matches your shaft diameter exactly for a secure fit. If your shaft is slightly undersized, a set screw or keyway can be used to lock the gear in place.

What does Module 0.5 mean and will it mesh with my existing gears?

Module (Mod) is the standard metric measurement of gear tooth size. Module 0.5 gears will only mesh correctly with other Module 0.5 gears sharing the same pressure angle (20°). If your existing gear is marked 0.5M or M0.5, these gears are compatible. Do not attempt to mesh with Module 0.8, 1.0, or other module sizes.

How strong are these gears under load?

These gears are machined from 45# carbon steel, which provides good tensile strength suitable for light-to-medium duty transmission applications such as small robotics, motorized mechanisms, and educational equipment. For heavy industrial loads or continuous high-torque applications, consult a mechanical engineer to verify suitability.

Are these gears corrosion resistant?

45# carbon steel has moderate corrosion resistance. For applications in humid or outdoor environments, we recommend applying a light machine oil or grease to the gear teeth and bore after installation. If corrosion resistance is a primary requirement, consider stainless steel or plastic gear alternatives.

Can I use these gears in a 3D printer extruder or similar precision application?

Yes. The standard 0.5 mod involute tooth profile and consistent bore dimensions make these gears suitable for use in 3D printer extruder drives, small CNC mechanisms, and similar applications where dimensional accuracy and repeatable meshing are important. Verify the bore size matches your motor shaft before ordering.

Why should I order multiple pieces at once?

Ordering in packs of 2, 3, 5, or more gives you spare gears on hand for future repairs or replacements without waiting for reshipment. Multi-pack options also reduce the per-unit cost, making them economical for small production runs, classroom kits, or projects requiring multiple gear stages.

What is the pressure angle of these spur gears?

These gears use the standard 20° pressure angle, which is the most common standard for metric module gears worldwide. This ensures compatibility with the vast majority of commercially available Module 0.5 mating gears and pinions.

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