How do I select the right OD for the worm shaft?

The shaft OD (18, 22, 26, or 28 mm) must fit within your housing bore or bearing seat. The bore size (6–15 mm) is chosen to fit your motor shaft.

Module 1 Brass Worm Gear Wheel Worm Shaft C45 Steel 28 Tooth Bore 6/8/10 - 15 mm

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Module 1 Brass Worm Gear Wheel Worm Shaft C45 Steel 28 Tooth Bore 6/8/10 - 15 mm

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By HomeDIYer®

Types: 1 Mod - 28 Teeth Worm Gear

Bore: 8 mm

Material & Amount: Brass & 1 PCS

Price:

$32.57 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

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Module 1 Worm Gear & Worm Shaft Set — Precision Drive Components for Robotics and Automation

When your motion-control project demands a compact, self-locking drive solution, mismatched or undersized gearing is the first thing that kills a build. Engineers, robotics hobbyists, and small-batch manufacturers who need a reliable 1 Mod worm drive set will find this matched gear-and-shaft combination ready to drop into tight spaces where a standard spur gear simply won't do.

This listing covers a complete 1 Module worm drive set consisting of a 28-tooth worm gear wheel (available in brass) and a mating worm shaft rod (available in C45 medium-carbon steel), sold individually or in multi-piece packs of 1, 2, 3, 5, or 10. The worm gear bore ranges from 8–12 mm (0.31–0.47 in); worm shaft bore options span 6–15 mm (0.24–0.59 in) with outer diameters of 18 mm (0.71 in), 22 mm (0.87 in), 26 mm (1.02 in), or 28 mm (1.10 in). Select A-Type (plain bore) or B-Type (with keyway) shaft configurations to match your hub requirements.

Typical use cases include DIY pan-tilt camera rigs requiring self-locking worm drives, small conveyor or indexing table builds where a 1 Mod worm gear set provides precise step-down ratios, and desktop CNC or 3D-printer axis upgrades that benefit from a compact brass worm gear wheel paired with a hardened steel worm shaft.

⚙️ Compatibility: Module 1 (1 Mod) standard. Worm gear and worm shaft are matched at 1 Mod — do not mix with Module 0.5, 1.5, or 2 components. Verify bore diameter and keyway dimensions against your shaft or hub before ordering.

✅ Key Features of These Module 1 Worm Gear & Worm Shaft Sets

🔩 Matched 1 Mod Pairing

Worm gear wheel and worm shaft are both cut to Module 1 standard, ensuring correct tooth engagement and smooth torque transfer without custom fitting.

🟡 Brass Gear Wheel — Low Friction, Corrosion Resistant

The 28-tooth worm gear is machined from brass, offering inherently low sliding friction against the steel worm shaft and resistance to oxidation in humid or lightly corrosive environments.

⚙️ C45 Steel Worm Shaft — Hardened Working Surface

The worm rod is turned from C45 medium-carbon steel, providing the surface hardness needed to drive the brass gear repeatedly without accelerated wear on the thread flanks.

🔑 A-Type & B-Type Shaft Options

A-Type shafts feature a plain round bore; B-Type shafts include a precision-cut keyway (4×1.8 mm or 5×2.3 mm depending on bore size) for positive torque transmission without set-screw slip.

📐 Wide Bore & OD Selection

Gear bore: 8, 10, or 12 mm. Shaft bore: 6–15 mm across OD sizes of 18, 22, 26, and 28 mm — covering the most common motor shaft and hub diameters used in DIY and light industrial builds.

📦 Flexible Pack Quantities

Order 1, 2, 3, 5, or 10 pieces per variant to match prototype, small-batch, or production run requirements without overstocking.

📐 Technical Specifications — Module 1 Worm Gear & Worm Shaft

Module	1 (Mod 1)
Gear Type	Worm Gear Wheel (28 Teeth) / Worm Shaft Rod (A-Type or B-Type)
Gear Material	Brass
Shaft Material	C45 Medium-Carbon Steel
Number of Teeth (Gear)	28
Gear Bore Diameter	8 mm / 10 mm / 12 mm (0.31–0.47 in)
Shaft Bore Diameter	6–15 mm (0.24–0.59 in) — see variant options
Shaft Outer Diameter (OD)	Ø 18 mm / Ø 22 mm / Ø 26 mm / Ø 28 mm — see variant options
Shaft Configuration	A-Type (plain bore) / B-Type (with keyway)
Keyway Dimensions	4×1.8 mm (bore ≤12 mm) / 5×2.3 mm (bore ≥14 mm) — B-Type only
Surface Finish	Machined; brass gear natural finish, steel shaft natural finish
Pack Quantity	1 / 2 / 3 / 5 / 10 PCS — see variant options

❓ Frequently Asked Questions

How do I choose the correct bore size for the worm gear wheel?

Measure the output shaft of your motor or gearbox with a caliper. The gear bore must match that shaft diameter exactly — 8, 10, or 12 mm for the brass worm gear wheel. If your shaft is slightly undersized, a set screw or locking collar can compensate, but a bore-to-shaft match is always preferred for concentricity.

What is the difference between A-Type and B-Type worm shafts?

A-Type shafts have a plain round bore — torque is transmitted via a set screw or press fit. B-Type shafts include a machined keyway (4×1.8 mm or 5×2.3 mm depending on bore size) that accepts a standard parallel key, providing a positive mechanical connection that resists rotational slip under load. Choose B-Type for higher-torque or reversing-load applications.

Will the brass worm gear wear out faster than a steel gear?

Brass is intentionally the softer material in a worm drive pair. This is by design: the brass gear acts as the sacrificial wear component, protecting the harder steel worm shaft. In most DIY and light industrial applications the brass gear will outlast the project lifecycle. For continuous-duty industrial use, inspect the gear periodically and replace as needed — spare gears are available in multi-packs.

Is this worm drive self-locking?

A 1 Mod worm drive with a single-start worm thread typically exhibits self-locking behavior when the lead angle is below approximately 5°. This means the gear cannot back-drive the shaft under static load, which is useful for holding positions (e.g., pan-tilt heads, valve actuators) without a brake. Confirm the specific lead angle for your chosen variant before relying on self-locking in a safety-critical application.

Can I use these components in a corrosive or outdoor environment?

The brass worm gear wheel has good natural corrosion resistance and performs well in humid or mildly corrosive indoor environments. The C45 steel worm shaft is susceptible to surface rust if exposed to moisture without protection — apply a light machine oil or grease to the shaft threads and store in a dry location. For outdoor or washdown environments, consider enclosing the drive in a sealed housing.

How do I select the right OD (outer diameter) for the worm shaft?

The shaft OD (18, 22, 26, or 28 mm) determines the physical envelope of the worm rod and must fit within your housing bore or bearing seat. Match the OD to your bearing inner race diameter. The bore size (6–15 mm) is independent of the OD and is chosen to fit your motor shaft. Both dimensions are listed in the variant name — for example, "10 mm Ø 22 mm" means a 10 mm bore inside a 22 mm OD shaft body.

Are the worm gear and worm shaft sold as a set or separately?

Each variant is sold as a single component type — either the worm gear wheel or the worm shaft rod — in your chosen quantity (1, 2, 3, 5, or 10 PCS). To build a complete worm drive, add both a worm gear variant and a matching worm shaft variant to your cart. Ensure both are Module 1 and that the shaft OD is compatible with your housing.

🛒 Select your Type, Bore, and Material & Amount above, then add to cart.