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When your project demands reliable power transmission with consistent tooth engagement, finding a spur gear that matches your motor shaft and driven component can be a frustrating search. Whether you are a robotics builder, a CNC hobbyist, or a mechanical engineer prototyping a custom gearbox, these 2 Module cylindrical spur gears give you a wide tooth-count selection in a single, standardised pitch family.
Each gear is machined to a 2 Module (Mod 2) standard with a tooth pitch of 6.28 mm (≈ 0.247 in). The available outer diameter range spans 58 mm to 204 mm (approximately 2.28 in to 8.03 in), covering tooth counts from 27T up to 100T. Bore diameter and face width vary by tooth count — see variant options for confirmed bore dimensions.
Typical applications include motor-to-gearbox pinion drives in 3D printer extruder assemblies, speed-reduction stages in electric go-kart drivetrains, rotary indexing tables for DIY CNC routers, and torque-multiplication stages in robotic arm joints requiring a compact 2 Mod gear mesh.
| Module | 2 (Mod 2) |
|---|---|
| Tooth Pitch | 6.28 mm (≈ 0.247 in) |
| Tooth Count Range | 27T – 100T (42 variants) |
| Outer Diameter Range | 58 mm – 204 mm (2.28 in – 8.03 in) |
| Tooth Profile | Involute, full-depth |
| Pressure Angle | 20° |
| Bore Diameter | See variant options |
| Face Width | See variant options |
| Material | See variant options |
| Finish / Coating | See variant options |
| Gear Type | Cylindrical Spur Gear |
| Sold As | 1 piece per order |
Your gear ratio is determined by dividing the driven gear tooth count by the driving gear tooth count. For example, pairing a 27T motor pinion with a 54T output gear gives a 2:1 reduction. Measure your available centre distance first, then use the formula: Centre Distance = (T1 + T2) × Module / 2 to confirm the pair fits your housing.
Module is the standardised metric unit for gear tooth size. A Module 2 gear has a tooth pitch of 6.28 mm (π × 2). Two gears must share the same module and pressure angle to mesh correctly. These gears are all Mod 2 / 20° pressure angle and will mesh with any other Mod 2 spur gear or rack.
Bore diameter varies by tooth count and is listed in the individual variant details. Measure your motor or drive shaft diameter with a vernier calliper before ordering. If you need a custom bore size, a standard lathe boring operation can open the bore — leave at least 2–3 mm of wall material between the bore and the root circle for structural integrity.
Corrosion resistance depends on the material and finish of the specific variant you select. For outdoor or humid environments, choose variants with a zinc-plated, black-oxide, or stainless finish where available. If operating in a wet environment, periodic lubrication with a water-resistant grease is recommended regardless of finish.
Load capacity depends on tooth count, face width, material, and operating speed — all of which vary by variant. As a conservative guideline for Mod 2 steel spur gears, tangential tooth load typically ranges from 50 N to 500 N depending on face width and speed. For critical load calculations, apply AGMA or ISO 6336 gear strength standards using the confirmed face width and material data from your chosen variant.
Yes — smaller tooth counts (27T–35T) are commonly used as motor pinions. Confirm the bore diameter matches your motor shaft, and check that the OD clears your motor housing. A keyway or set-screw collar is recommended for positive shaft retention under reversing loads.
Spur gears operating under load benefit from lubrication to reduce wear and heat. For enclosed gearboxes, an ISO VG 220 gear oil or lithium-based grease is suitable. For open drives running at low speed, a light application of grease to the tooth flanks every 50–100 operating hours is a practical maintenance interval.
