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When a slipping or mismatched gear brings your CNC router, linear actuator, or automation rig to a halt, you need a replacement you can trust to mesh cleanly and hold torque. These 1.5 mod spur gears and gear racks are engineered for makers, machine builders, and small-shop fabricators who demand dimensional accuracy and consistent performance across every tooth.
Each gear is machined from 45# carbon steel — a medium-carbon alloy known for its balance of hardness and machinability. The module is 1.5 (pitch = 4.712 mm / ~0.1855 in), with tooth counts spanning 15T through 50T. Bore diameter and face width vary by tooth count; see variant options for exact dimensions. Gear racks in this series share the same 1.5 mod tooth profile for direct compatibility.
Typical use cases include CNC gantry drives requiring a 1.5 mod rack-and-pinion linear motion system, rotary indexing tables needing a compact spur gear set for stepper or servo coupling, and DIY robotics joints where a low-backlash 45 steel gear withstands repeated load cycles without deformation.
Machined from medium-carbon 45# steel for a reliable combination of surface hardness and core toughness — resists tooth deformation under sustained load.
Standard Mod 1.5 involute tooth geometry ensures smooth meshing and interchangeability with any other 1.5 mod gear or rack in your drivetrain.
Thirty-six size options from 15 to 50 teeth let you dial in the exact gear ratio needed for your CNC, robotics, or automation application without custom machining.
Gear racks share the same 1.5 mod profile, enabling direct rack-and-pinion pairing for linear motion stages, laser cutters, and plasma table gantries.
Tooth pitch and pressure angle are held to standard tolerances, reducing backlash and ensuring repeatable positioning in closed-loop servo and stepper systems.
Suitable for CNC routers, 3D printer extruder drives, rotary tables, conveyor indexers, and general-purpose power transmission where a compact spur gear is required.
| Module | 1.5 |
|---|---|
| Tooth Count Options | 15T – 50T (36 variants) |
| Pitch (circular) | 4.712 mm (~0.1855 in) |
| Pressure Angle | 20° |
| Material | 45# Carbon Steel |
| Finish | See variant options |
| Bore Diameter | See variant options |
| Face Width | See variant options |
| Pitch Diameter Range | 22.5 mm (15T) – 75 mm (50T) |
| Outside Diameter Range | Approx. 25.5 mm (15T) – 78 mm (50T) |
| Packing Quantity | 1 pcs per order |
| Application | CNC, robotics, automation, linear motion |
Select your tooth count based on the gear ratio you need. Divide the driven gear teeth by the driving gear teeth to get the ratio. For example, a 30T pinion driving a 15T gear gives a 2:1 speed increase. If you are replacing an existing gear, match the tooth count and module (1.5) exactly. For rack-and-pinion linear motion, the pinion tooth count determines linear travel per revolution: travel = π × module × teeth = π × 1.5 × T mm per revolution.
Module (Mod) is the standard metric gear sizing system. Mod 1.5 means the pitch diameter equals 1.5 mm × number of teeth. Two gears mesh correctly only if they share the same module and pressure angle (20° for this series). If your existing gear is labeled Mod 1.5 or M1.5, these gears are directly compatible. Imperial DP (diametral pitch) gears are not interchangeable with metric module gears.
45# carbon steel offers a tensile strength of approximately 600–700 MPa and yield strength around 355 MPa in the normalized condition. For light-to-medium CNC and automation loads these gears perform reliably. For heavy shock loads or continuous high-torque applications, consider adding a keyway or set-screw bore modification, and verify your torque requirements against the gear's face width and pitch diameter.
45# carbon steel is not inherently corrosion resistant. For indoor CNC and dry automation environments, standard lubrication (grease or gear oil) provides adequate protection. For humid or outdoor environments, apply a rust-inhibiting coating or consider periodic re-lubrication. If corrosion resistance is critical, contact us to confirm finish options.
Bore diameter varies by tooth count and is listed in the variant options. 45# carbon steel is machinable, so the bore can be enlarged, keyed, or tapped by a machine shop if the standard bore does not match your shaft. Always confirm the remaining wall thickness is sufficient for your torque load before modifying.
Yes. The gear racks in this 1.5 mod series share the same tooth profile and pressure angle as the spur gears, making them directly compatible for rack-and-pinion drives. Linear travel per motor revolution = π × 1.5 mm × pinion tooth count. For example, a 20T pinion produces approximately 94.25 mm of linear travel per revolution. Mount the rack securely and ensure the pinion center distance is set to the standard pitch radius for minimal backlash.
Yes, lubrication extends gear life significantly. Apply a thin layer of lithium-based grease or gear oil to the tooth faces before first use. For CNC routers and automation systems running daily, re-lubricate every 3–6 months or whenever you notice increased noise or resistance. Avoid over-greasing, which can attract dust and abrasive particles.
