1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth
1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth
1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth
1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth
1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth
1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth
1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth
1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth
1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth
1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth
1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth
1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth
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1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth

1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth

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By HomeDIYer®

Price:
$2.76 USD
Stock:
In stock (500 units), ready to be shipped

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Description

1 Mod 45# Steel Spur Gears — Precision Motion Control for Makers and Engineers

When your CNC router, robotic arm, or custom drive train demands reliable gear meshing without slop or premature wear, choosing the right spur gear matters. These 1 Mod 45# steel spur gears are engineered for hobbyists, workshop builders, and small-batch machine designers who need consistent tooth geometry and a secure shaft fit across a wide range of configurations.

Each gear is machined from 45# medium-carbon steel, delivering a good balance of hardness and machinability. The tooth profile follows the standard Module 1 (Mod 1) metric system, with pitch diameter ranging from approximately 12 mm (12T) to 120 mm (120T). Bore options span 5 mm to 16 mm (roughly 0.197" to 0.630"), and every gear ships with a set-screw (grub screw) for positive shaft retention.

Typical use cases include DIY CNC axis drives where a 1 Mod gear pair provides smooth, low-backlash transmission; 3D printer extruder and Z-axis assemblies requiring a compact, hard-tooth pinion; and educational robotics platforms where students need an affordable, interchangeable metric gear set for torque-ratio experiments.

⚙️ Compatibility: Meshes with any standard Module 1 (1 Mod) spur or pinion gear. Verify bore diameter matches your shaft size before ordering. Set-screw secures to plain or flat-sided shafts.

✅ Key Features of These 1 Mod 45# Steel Spur Gears

  • 🔩Wide Tooth Count Range (12T–120T) — Choose from 34 tooth-count options to dial in your exact gear ratio, from high-speed pinions to large reduction wheels.
  • 🕳️Multiple Bore Sizes (5–16 mm) — Ten bore diameter options (5, 6, 6.35, 7, 8, 10, 12, 14, 15, 16 mm) accommodate the most common metric and fractional motor shafts.
  • 🔧Grub Screw Included — Each gear comes with a set-screw for secure, tool-adjustable shaft retention without the need for keyways or press-fitting.
  • ⚙️Standard Module 1 Tooth Profile — Fully interchangeable with any Mod 1 rack, pinion, or spur gear, making system expansion or replacement straightforward.
  • 🏗️45# Medium-Carbon Steel Construction — Offers a practical balance of surface hardness and toughness for moderate-load, continuous-duty applications in dry or lightly lubricated environments.
  • 📐Hard Tooth Surface — Teeth are processed for increased surface hardness, reducing wear at the contact zone and extending service life under repetitive meshing loads.

📐 Technical Specifications — 1 Mod Spur Gears

Module 1 (Mod 1)
Material 45# Medium-Carbon Steel
Tooth Count Options 12T, 15T, 16T, 18T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 33T, 35T, 36T, 38T, 40T, 42T, 44T, 45T, 48T, 50T, 52T, 54T, 55T, 56T, 60T, 64T, 66T, 70T, 72T, 80T, 100T, 120T
Bore Diameter Options 5 mm, 6 mm, 6.35 mm, 7 mm, 8 mm, 10 mm, 12 mm, 14 mm, 15 mm, 16 mm
Pitch Diameter Range 12 mm (12T) – 120 mm (120T)
Pressure Angle 20° (standard)
Shaft Retention Grub screw (set-screw) included
Tooth Surface Hard tooth (surface hardened)
Gear Type Spur (parallel axis)
Weight See variant options
Finish See variant options

❓ Frequently Asked Questions

How do I choose the right tooth count for my application?

The gear ratio equals the driven gear's tooth count divided by the driving gear's tooth count. For example, pairing a 20T pinion with a 60T wheel gives a 3:1 reduction. Select a smaller tooth count (12T–25T) for high-speed, low-torque output, or a larger count (50T–120T) when you need torque multiplication and slower rotation.

Which bore size should I order for my motor shaft?

Measure your motor or drive shaft diameter with calipers. Common metric sizes are 5, 6, 8, 10, and 12 mm; the 6.35 mm option suits ¼" imperial shafts. The grub screw allows fine adjustment, but the bore must match the shaft diameter — do not attempt to force an undersized bore onto a shaft.

Will these gears mesh with my existing Module 1 rack or gears?

Yes. All gears in this listing follow the standard Module 1 (1 Mod) metric tooth system with a 20° pressure angle, which is the most widely used metric gear standard. They will mesh correctly with any other Mod 1 spur gear, pinion, or rack regardless of brand, provided the tooth count and center distance are calculated correctly.

How strong are these gears under load?

45# steel provides a tensile strength of approximately 600–700 MPa in the normalized condition, with surface hardening further improving tooth contact durability. These gears are suitable for moderate-load, intermittent or continuous-duty applications such as CNC axis drives, extruder mechanisms, and light industrial automation. For heavy shock loads or very high RPM, consider a gear with a higher alloy steel grade.

Are these gears corrosion-resistant?

45# carbon steel has limited inherent corrosion resistance. For indoor, dry, or lightly lubricated environments they perform well. If your application involves moisture, outdoor exposure, or chemical contact, apply a light machine oil or grease to the tooth surfaces, or consider stainless steel or nylon gear alternatives for corrosive environments.

Do I need any special tools to install the gear onto a shaft?

No special tools are required. Slide the gear onto the shaft, position it at the desired axial location, then tighten the included grub screw with a hex key (Allen wrench) of the appropriate size. For best results, ensure the shaft surface is clean and free of burrs. A flat on the shaft aligned with the grub screw will provide more positive retention under high torque.

Can I use these gears in a 3D printer or CNC router build?

Yes, these are a popular choice for DIY CNC and 3D printer projects. The Mod 1 standard is widely used in open-source machine designs (e.g., extruder drives, Z-axis lead screw couplings, and belt-gear hybrids). Verify the bore matches your stepper motor shaft (typically 5 mm for NEMA 17 or 6.35 mm for some NEMA 23 motors) and confirm the tooth count matches your design's gear ratio requirement.

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

 

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