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When a right-angle drive fails mid-project, the culprit is almost always an undersized or poorly matched bevel gear. Engineers, robotics builders, and CNC hobbyists who need reliable 90° torque transfer without backlash-prone workarounds will find these metric bevel gears a direct, measurable solution. Each gear is machined from 45# carbon steel and heat-treated for surface hardness, giving the tooth flanks the durability to handle cyclic loads that softer materials cannot sustain.
These bevel gears are offered in six metric modules — 1, 1.5, 2, 2.5, 3, and 4 — with tooth counts ranging from 15 to 40 teeth per gear. Outer diameters span 16.2 mm (0.64 in) for the smallest 1M15T up to 126 mm (4.96 in) for the largest 4M30T, covering a wide range of shaft-center distances and torque requirements. Each variant is a single gear; mating pairs must be ordered in matching module and tooth-count combinations to achieve the 90° mesh angle.
Typical applications include right-angle gearbox assemblies in desktop CNC routers, differential drives in wheeled robots, rotary indexing tables, and custom power-transmission rigs where a worm gear would introduce too much friction or a bevel gear set offers a more compact layout. Long-tail use cases such as "metric bevel gear pair for 3D printer extruder drive" and "45 steel bevel gear 2 mod 20 teeth" are well served by the breadth of this range.
Six Metric Modules Available — Module 1, 1.5, 2, 2.5, 3, and 4 in a single listing, so you can match the gear to your existing drivetrain without sourcing from multiple suppliers.
15 to 40 Tooth Range — Wide tooth-count selection lets you dial in the gear ratio and pitch-circle diameter needed for your specific shaft spacing and speed requirement.
Hardened 45# Carbon Steel — Heat-treated tooth flanks resist wear under cyclic and shock loads, extending service life compared to mild-steel or cast alternatives.
True 90° Mating Angle — Precision-cut tooth geometry ensures correct mesh at a right angle, minimising noise and vibration in assembled gearboxes.
OD Range 16.2 mm – 126 mm — From compact 1M15T (16.2 mm / 0.64 in) to large 4M30T (126 mm / 4.96 in), covering benchtop robotics through mid-scale industrial drives.
Single-Gear Purchase Flexibility — Order exactly the quantity and specification you need; mix modules and tooth counts across variants to build complete bevel gear pairs or replace a single worn gear.
| Material | 45# Carbon Steel (heat-treated / hardened) |
|---|---|
| Module | 1 / 1.5 / 2 / 2.5 / 3 / 4 |
| Tooth Count | 15 – 40 teeth (varies by variant) |
| Mating Shaft Angle | 90° |
| Outer Diameter (OD) | 16.2 mm – 126 mm (0.64 in – 4.96 in) — see variant options |
| Bore Diameter | See variant options |
| Pressure Angle | 20° (standard metric bevel) |
| Surface Treatment | Heat-treated for tooth hardness |
| Finish | See variant options |
| Weight | See variant options |
| Quantity per Order | 1 piece |
The module (M) determines the tooth size and must match between mating gears. A higher module means larger, stronger teeth suited to higher torque. The tooth count sets the gear ratio: divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For a 1:1 ratio at 90°, order two gears of the same module and tooth count. Always confirm the resulting pitch-circle diameter fits within your housing before ordering.
No. Bevel gears must share the same module to mesh correctly. Mixing modules results in incorrect tooth engagement, accelerated wear, and potential gear failure. Always order both the driving and driven gear in the same module.
The gears are machined from 45# carbon steel and heat-treated to increase surface hardness on the tooth flanks. This makes them significantly more resistant to wear and pitting than untreated mild steel. Exact load ratings depend on module, tooth count, speed, and lubrication conditions. For critical or continuous-duty applications, consult a gear engineer using the module and material data provided.
45# carbon steel is not inherently corrosion-resistant. For outdoor, humid, or washdown environments, apply a suitable gear lubricant or grease to the tooth flanks and housing, or consider stainless-steel alternatives. Regular re-lubrication will significantly extend service life in moist conditions.
Bore diameter varies by module and tooth count — refer to the product images or contact us to confirm the bore for your specific variant before ordering. If the standard bore does not match your shaft, a machinist can typically bore the gear to a larger diameter, provided sufficient wall thickness remains. Keyways and set-screw holes can also be added by a local machine shop.
Each listing is for a single gear. You can order just one if you are replacing a worn gear in an existing matched set — provided the replacement is the same module and tooth count as the surviving gear. If building a new drive from scratch, order two gears of the same module (and your desired tooth counts) to form a complete bevel gear pair.
For enclosed gearboxes, an ISO VG 220 or VG 320 gear oil is a common choice for moderate-speed bevel drives. For open or semi-open drives, a lithium-based or molybdenum-disulfide grease applied to the tooth flanks works well. Avoid running the gears dry, as unlubricated steel-on-steel contact will accelerate tooth wear significantly.
