{"product_id":"2-mod-45-steel-spur-gear-12t-35t-bore-8-30mm-pinion-gear-with-step-motor-gears","title":"2 Mod 45# Steel Spur Gear 12T-35T Bore 8-30mm Pinion Gear with Step Motor Gears","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e2 Mod 45# Steel Spur Gear — Precision Pinion Gears for CNC, Robotics \u0026amp; Stepper Motor Drives\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or undersized gear causes your CNC router, 3D printer, or automation rig to lose steps and accuracy, the fix starts with the right pinion gear. These 2 Mod 45# steel spur gears are engineered for makers, machine builders, and automation engineers who need reliable, repeatable power transmission without compromise.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel, offering a solid balance of hardness and machinability. The module is 2M (2 mm per tooth), with tooth counts ranging from 12T to 35T and pitch circle diameters scaling accordingly — from approximately 24 mm (0.94 in) for 12T up to 70 mm (2.76 in) for 35T. Bore options span 8 mm to 30 mm, with keyway configurations (4 mm or 5 mm or 6 mm or 8 mm keyway depending on bore size) available for positive shaft engagement, plus plain bore and process-hole variants for custom fitting.\u003c\/p\u003e\n\u003cp\u003eThese spur gears are well-suited for stepper motor pinion drives in CNC routing tables, rack-and-pinion linear motion systems, robotic joint actuators, and light industrial conveyor drives. The standardized 2M tooth profile ensures direct interchangeability with matching 2 Mod racks, idlers, and mating gears across your build.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for 2 Module (Mod 2) gear systems. Mates with 2M racks, 2M idler gears, and 2M ring gears. Verify shaft diameter and keyway dimensions against your motor or gearbox spec before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These 2 Mod 45# Steel Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from 45# carbon steel for a reliable combination of tensile strength and wear resistance — suited for continuous-duty motion control applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eModule 2 Standardized Tooth Profile\u003c\/strong\u003e\n\u003cp\u003e2M tooth geometry ensures direct mesh compatibility with standard 2 Mod racks and mating gears, simplifying system design and part sourcing.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n\u003cstrong\u003eWide Tooth Count Range: 12T to 35T\u003c\/strong\u003e\n\u003cp\u003eChoose from 21 tooth-count options (12T through 35T) to dial in your gear ratio precisely — from compact high-speed pinions to larger torque-multiplying gears.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n\u003cstrong\u003eMultiple Bore \u0026amp; Keyway Options\u003c\/strong\u003e\n\u003cp\u003ePlain bores (8 mm, 10 mm), keyed bores (12–30 mm with 4–8 mm keyways), and process-hole variants available — select the fit that matches your shaft without secondary machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n\u003cstrong\u003eStepper Motor \u0026amp; Servo Drive Ready\u003c\/strong\u003e\n\u003cp\u003eBore sizing and keyway dimensions are matched to common NEMA stepper and servo motor shaft standards, enabling direct mounting on most motion-control drives.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n\u003cstrong\u003eRack-and-Pinion \u0026amp; Rotary Drive Compatible\u003c\/strong\u003e\n\u003cp\u003eUse as a pinion on linear rack systems or as a rotary drive gear in gearhead assemblies — the standardized 2M profile works across both application types.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — 2 Mod Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e2M (2 mm\/tooth)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Medium-Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e12T – 35T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Circle Diameter Range\u003c\/th\u003e\n\u003ctd\u003e24 mm – 70 mm (0.94 in – 2.76 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e8 mm – 30 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003e4 mm, 5 mm, 6 mm, 8 mm (bore-dependent); plain bore and process hole also available\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Face Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right tooth count for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eTooth count determines your gear ratio and pitch circle diameter. For a rack-and-pinion CNC axis, a lower tooth count (12T–16T) gives finer resolution per motor step, while a higher count (20T–35T) increases linear speed per revolution. Match your tooth count to your desired travel speed and motor torque output. Pair with a 2M rack for linear motion or a mating 2M gear for rotary reduction.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size should I select for my stepper motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCommon NEMA 17 stepper motors have a 5 mm shaft — note that the smallest bore offered here is 8 mm, so a shaft adapter or coupler may be needed for NEMA 17. NEMA 23 motors typically use 6.35 mm or 8 mm shafts, and NEMA 34 motors commonly use 12.7 mm or 14 mm shafts. Select the bore that matches your motor shaft diameter; choose a keyway variant for positive torque transmission without set-screw slip.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these gears under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel has a typical tensile strength of approximately 600–700 MPa and yield strength around 355 MPa, making it suitable for moderate-to-heavy duty motion control loads. For very high-cycle or shock-load applications, consider whether a hardened or alloy steel gear would better suit your requirements. These gears are designed for continuous-duty CNC, robotics, and automation use within standard 2M module load ratings.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears corrosion resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel is not inherently corrosion resistant. For indoor, dry environments (typical CNC and robotics setups), the material performs well with standard lubrication. If your application involves moisture, coolant exposure, or outdoor conditions, apply a rust-inhibiting grease or consider a surface treatment such as zinc plating or black oxide coating after purchase.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh directly with a standard 2M rack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These gears use a standard Module 2 (2M) tooth profile with a 20° pressure angle, which is the industry-standard geometry for 2M rack-and-pinion systems. They will mesh correctly with any 2M-compatible rack, idler, or mating gear that also uses a 20° pressure angle. Always verify the module and pressure angle of your mating components before assembly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a plain bore, keyway bore, and process hole?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA \u003cstrong\u003eplain bore\u003c\/strong\u003e (8 mm or 10 mm) is a smooth cylindrical hole — typically secured with a set screw or press fit. A \u003cstrong\u003ekeyway bore\u003c\/strong\u003e includes a machined slot that accepts a key for positive, non-slip shaft engagement — the preferred choice for driven gears under torque. A \u003cstrong\u003eprocess hole\u003c\/strong\u003e is a rough-bored blank intended for custom machining to your exact shaft diameter and keyway spec — ideal when your shaft size falls outside the standard options listed.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears for a rack-and-pinion linear axis on a CNC router?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, this is one of the most common use cases. Select a tooth count that gives your desired linear travel per motor revolution (linear travel = π × module × tooth count per revolution), then pair with a matching 2M steel or nylon rack. For a typical CNC gantry, 20T–25T pinions offer a good balance of speed and resolution. Use a keyed bore variant to prevent shaft slip under cutting loads.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Model (tooth count) and Bore size above, then add to cart.\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right tooth count for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Tooth count determines your gear ratio and pitch circle diameter. For a rack-and-pinion CNC axis, a lower tooth count (12T–16T) gives finer resolution per motor step, while a higher count (20T–35T) increases linear speed per revolution. Match your tooth count to your desired travel speed and motor torque output.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore size should I select for my stepper motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"NEMA 23 motors typically use 6.35 mm or 8 mm shafts, and NEMA 34 motors commonly use 12.7 mm or 14 mm shafts. Select the bore that matches your motor shaft diameter; choose a keyway variant for positive torque transmission.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these gears under load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel has a typical tensile strength of approximately 600–700 MPa and yield strength around 355 MPa, suitable for moderate-to-heavy duty motion control loads in CNC, robotics, and automation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel is not inherently corrosion resistant. For indoor dry environments, standard lubrication is sufficient. For moisture or coolant exposure, apply a rust-inhibiting grease or surface treatment after purchase.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh directly with a standard 2M rack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These gears use a standard Module 2 (2M) tooth profile with a 20° pressure angle, compatible with any 2M rack, idler, or mating gear using the same pressure angle.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a plain bore, keyway bore, and process hole?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A plain bore is a smooth cylindrical hole secured with a set screw or press fit. A keyway bore includes a machined slot for positive non-slip shaft engagement. A process hole is a rough-bored blank for custom machining to your exact shaft diameter and keyway spec.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears for a rack-and-pinion linear axis on a CNC router?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Select a tooth count that gives your desired linear travel per motor revolution (linear travel = π × module × tooth count), then pair with a matching 2M rack. For CNC gantry use, 20T–25T pinions offer a good balance of speed and resolution. Use a keyed bore variant to prevent shaft slip under cutting loads.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2M 12T \/ 8mm","offer_id":52442674692370,"sku":"GLFBQLPJGJXCD0510x1","price":11.49,"currency_code":"USD","in_stock":true},{"title":"2M 12T \/ 10mm","offer_id":52442674725138,"sku":"GLFBQLPJGJXCD0511x1","price":11.49,"currency_code":"USD","in_stock":true},{"title":"2M 13T \/ 8mm","offer_id":52442674757906,"sku":"GLFBQLPJGJXCD0512x1","price":12.23,"currency_code":"USD","in_stock":true},{"title":"2M 13T \/ 10mm","offer_id":52442674790674,"sku":"GLFBQLPJGJXCD0513x1","price":12.23,"currency_code":"USD","in_stock":true},{"title":"2M 14T \/ 8mm","offer_id":52442674823442,"sku":"GLFBQLPJGJXCD0514x1","price":13.04,"currency_code":"USD","in_stock":true},{"title":"2M 14T \/ 10mm","offer_id":52442674856210,"sku":"GLFBQLPJGJXCD0515x1","price":13.04,"currency_code":"USD","in_stock":true},{"title":"2M 15T \/ 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