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When a stripped or undersized gear brings your CNC router, robotic arm, or automation rig to a halt, you need a replacement that fits precisely and holds up under continuous load. Engineers, makers, and small-batch manufacturers who demand dimensional accuracy and corrosion resistance turn to stainless steel Mod 1 spur gears rather than settling for zinc or plastic alternatives that wear prematurely.
These stainless steel Mod 1 spur gears are machined from 304-grade stainless steel, offering a hardness typically in the 180–220 HB range and a tensile strength of approximately 515 MPa. Each gear follows the Mod 1 (1 mm/tooth) standard, with pitch diameters ranging from 15 mm (15T) to 30 mm (30T) — or roughly 0.59 in to 1.18 in. Bore options span 5 mm through 17 mm, plus multiple keyway configurations (8 mm, 10 mm, 12 mm, 14 mm, and 15 mm keyway bores) for positive shaft engagement.
Typical use cases include motor pinion replacement in desktop CNC machines and laser cutters, drive-train gearing in small robotic platforms and pick-and-place systems, and speed-reduction stages in conveyor or indexing automation where a compact Mod 1 spur gear set is required. The wide bore range makes these gears compatible with common NEMA 17/23 stepper motor shafts as well as servo and DC motor outputs.
Machined from 304-grade stainless steel for reliable corrosion resistance in humid, washdown, or outdoor environments — outlasting zinc-alloy or plastic alternatives.
Available in 15 through 30 teeth (Mod 1), giving pitch diameters from ~15 mm to ~30 mm (0.59–1.18 in) to suit a broad range of gear-ratio requirements.
Plain bores from 5 mm to 17 mm, plus keyway bores (8 mm, 10 mm, 12 mm, 14 mm, 15 mm) for positive shaft engagement — no slipping under torque.
Precision-cut teeth with a standard 20° pressure angle deliver smooth, low-noise power transmission and consistent positioning in CNC and automation applications.
Bore range covers NEMA 17 (5 mm), NEMA 23 (6.35 mm), and larger servo/DC motor shafts up to 17 mm — drop-in fit for the most common motion-control platforms.
Suited for CNC routers, laser cutters, robotic arms, pick-and-place machines, conveyor indexers, and any application requiring a compact, durable Mod 1 spur gear.
| Material | 304 Stainless Steel |
|---|---|
| Module (Mod) | 1 (1 mm per tooth) |
| Pressure Angle | 20° |
| Number of Teeth | 15T, 16T, 17T, 18T, 19T, 20T, 22T, 23T, 24T, 25T, 26T, 27T, 28T, 29T, 30T |
| Pitch Diameter Range | 15 mm – 30 mm (0.59 in – 1.18 in) |
| Bore Options (Plain) | 5 mm, 6 mm, 6.35 mm, 7 mm, 8 mm, 10 mm, 12 mm, 14 mm, 15 mm, 16 mm, 17 mm |
| Bore Options (Keyway) | 8 mm / 3×1.4 mm, 10 mm / 3×1.4 mm, 10 mm / 4×1.8 mm, 12 mm / 4×1.8 mm, 14 mm / 5×2.3 mm, 15 mm / 5×2.3 mm |
| Gear Face Width | See variant options |
| Hub Diameter | See variant options |
| Surface Finish | Natural stainless (uncoated) |
| Gear Type | External spur gear (pinion) |
| Application | CNC, robotics, automation, conveyor, indexing drives |
The tooth count determines the pitch diameter and gear ratio. For a given Mod 1 gear, pitch diameter (mm) = number of teeth. Pair a smaller pinion (e.g., 15T) with a larger driven gear to reduce speed and increase torque, or use matched tooth counts for a 1:1 ratio. Calculate your required ratio first, then select the tooth combination that fits your center-distance constraint.
Standard NEMA 17 stepper motors have a 5 mm output shaft. Select the 5 mm plain bore variant. NEMA 23 motors typically use a 6.35 mm (1/4 in) shaft — choose the 6.35 mm bore option for a direct fit.
Keyway bores are recommended when your application involves high torque, reversing loads, or frequent start-stop cycles where a plain bore gear could slip on the shaft. The keyway provides a positive mechanical lock between the gear and shaft. For light-duty or low-torque applications, a plain bore with a set screw is typically sufficient.
Yes. These gears follow the international Mod 1 standard with a 20° pressure angle, so they mesh correctly with any Mod 1 rack, pinion, or mating spur gear from any manufacturer that adheres to the same standard. Always verify that the mating gear also uses Mod 1 and 20° pressure angle before ordering.
304 stainless steel offers good resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is suitable for humid workshops, light washdown environments, and outdoor installations not exposed to salt spray. For marine or chloride-heavy environments, 316 stainless steel would be a stronger choice — contact us if you need guidance on material selection.
Torque capacity depends on the number of teeth, face width, material strength, and operating speed. As a conservative estimate for Mod 1 stainless steel spur gears at moderate speeds, allowable transmitted torque typically ranges from 0.5 N·m (15T, narrow face) to several N·m (30T, wider face). For precise load calculations, apply AGMA or ISO 6336 gear-strength standards using the actual face width from your selected variant, or contact us to confirm suitability for your specific load case.
For plain bore variants, a standard hex key (Allen wrench) to tighten the set screw is all that is needed. For keyway variants, you will also need a matching key stock cut to the appropriate length. No press-fit or specialized tooling is required for most installations — the gear slides onto the shaft and is secured with the set screw or key.
