Mod 1.5 Steel Pinion Gear Spur Gears 15-80 Teeth 5-30mm Bore With Screw Hardened

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Mod 1.5 Steel Pinion Gear Spur Gears 15-80 Teeth 5-30mm Bore With Screw Hardened

HomeDIYer

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By HomeDIYer®

Number of Gear Teeth: 15 Teeth

Bore Diameter: 8/3*1.4mm Key Slot

Tooth Thickness & Amount: 12 mm & 1 PCS

Price:

$13.57 USD

Stock:

In stock (500 units), ready to be shipped

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Mod 1.5 Steel Spur Gears — Hardened Pinion Gears for Reliable Power Transmission

When a stripped or undersized gear brings your build to a halt, you need a replacement that holds up under real load. These Mod 1.5 steel pinion spur gears are designed for engineers, robotics builders, and DIY machine makers who require consistent torque transfer without backlash or premature wear.

Each gear is machined from hardened steel and follows the Mod 1.5 (metric module) tooth profile standard. Tooth counts range from 15 to 80 teeth, with bore diameters spanning 5–30 mm (approximately 0.20–1.18 in). Tooth thickness options of 12 mm and 15 mm are available. A set screw is included for secure shaft mounting, and select variants feature keyway slots for positive rotational locking.

Typical applications include robotics drive trains requiring mod 1.5 spur gear sets, CNC router axis drives, conveyor and automation gearboxes, and small-batch manufacturing equipment where a hardened steel pinion gear with keyway is needed for shaft retention.

⚙️ Compatibility: Meshes with any Mod 1.5 (Module 1.5) standard spur gear. Verify bore diameter and tooth thickness match your shaft and mating gear before ordering.

✅ Key Features of These Mod 1.5 Steel Spur Gears

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Hardened Steel Construction
Machined from hardened steel for extended service life under continuous load and repeated engagement cycles.

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Mod 1.5 Standard Tooth Profile
Conforms to the metric Module 1.5 gear standard, ensuring accurate meshing with any compatible Mod 1.5 spur gear in your drivetrain.

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Wide Tooth Count Range: 15–80 Teeth
Covers a broad gear ratio spectrum in a single product line — from compact 15-tooth pinions to large 80-tooth driven gears.

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Set Screw Included for Secure Mounting
Each gear ships with a set screw for straightforward shaft fixation. Keyway slot variants provide additional rotational locking for high-torque applications.

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Multiple Bore Diameters: 5–30 mm
Bore options from 5 mm to 30 mm (0.20–1.18 in), including plain round bores and keyway configurations, accommodate a wide range of motor and shaft sizes.

⚡

12 mm and 15 mm Tooth Thickness Options
Choose the tooth thickness that matches your face width requirement for optimal load distribution and gear mesh contact ratio.

📐 Technical Specifications — Mod 1.5 Steel Spur Gear

Module (Mod)	1.5
Tooth Profile	Involute spur gear, 20° pressure angle (standard)
Number of Teeth	15 / 16 / 18 / 20 / 24 / 25 / 30 / 35 / 40 / 50 / 60 / 65 / 70 / 80
Tooth Thickness	12 mm or 15 mm (see variant options)
Bore Diameter	5–30 mm (see variant options; plain round or keyway)
Bore Type	Round bore with set screw; keyway slot variants available
Material	Hardened steel
Finish	See variant options
Fastener Included	Set screw (1 pc)
Quantity per Order	1 PCS
Outer Diameter	See variant options
Hub Step Height	See variant options (step dimensions noted in bore option label)

❓ Frequently Asked Questions

How do I choose the right number of teeth for my application?

The gear ratio is determined by dividing the driven gear tooth count by the driving (pinion) gear tooth count. For example, pairing a 20-tooth pinion with a 60-tooth gear gives a 3:1 reduction. Select your tooth counts based on the speed and torque ratio your drivetrain requires. Both gears must share the same module (Mod 1.5) to mesh correctly.

What bore diameter should I order?

Measure your motor or shaft diameter precisely with calipers. Select the bore option that matches your shaft size. If your shaft uses a keyway for positive locking, choose a keyway-slot bore variant (e.g., "8/3×1.4mm Key Slot" means an 8 mm bore with a 3×1.4 mm keyway). For plain shafts, a round bore with set screw is sufficient.

Are these gears strong enough for high-torque robotics or CNC use?

Yes. The gears are machined from hardened steel, which provides significantly higher surface hardness and fatigue resistance compared to mild steel or plastic alternatives. They are suitable for continuous-duty robotics drives, CNC axis motion, and light industrial conveyor systems operating within the rated load for Mod 1.5 geometry.

Will these gears corrode or rust in humid environments?

Hardened steel gears can develop surface oxidation in high-humidity or wet environments without protective treatment. For outdoor or damp installations, apply a light machine oil or anti-corrosion grease to the gear teeth and bore. For fully corrosion-resistant applications, consider stainless steel or plastic gear alternatives.

What does the "step" dimension mean in some bore options (e.g., "8mm step 35mm")?

The "step" value refers to the hub step height — the length of the reduced-diameter hub section that extends beyond the gear face. This stepped hub design allows the gear to be positioned and retained on a shaft shoulder or within a housing bore. Select the step height that matches your shaft shoulder or housing depth.

Can I use a 12 mm tooth thickness gear with a 15 mm tooth thickness gear?

Both gears must share the same module (Mod 1.5) to mesh, but mismatched face widths will result in only partial tooth contact. For optimal load distribution and gear life, both the pinion and driven gear should have the same or closely matched tooth thickness. Mixing 12 mm and 15 mm face widths is not recommended for continuous-duty applications.

Is the set screw included, and what size is it?

Yes, one set screw is included with each gear. The set screw size corresponds to the bore diameter and keyway dimensions of the selected variant. Contact us to confirm the exact set screw thread specification for your chosen variant if needed for your assembly planning.

🛒 Select your number of teeth, bore diameter, and tooth thickness above, then add to cart.