{"product_id":"2-mod-45-steel-spur-gear-10-120t-thick-20mm-pinion-gear-cnc","title":"2 Modul 45# Steel Spur Gears Pinion Gear Thick 20mm 10 - 120 Teeth For 3D CNC","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e2 Modulus 45# Steel Spur Gear — Thick 20mm Pinion for CNC, 3D Printing \u0026amp; Robotics\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router, 3D printer, or automation rig demands a spur gear that won't slip, strip, or flex under load, a lightweight plastic or low-grade metal gear becomes the weak link in your entire drivetrain. Engineers, makers, and small-batch manufacturers who need consistent torque transmission across a wide tooth-count range rely on a solid steel pinion that holds tolerance run after run.\u003c\/p\u003e\n\u003cp\u003eThese spur gears are machined from 45# medium-carbon steel — a structural steel known for its balanced hardness and machinability — with a uniform face width (thickness) of 20mm (~0.79 in). The module is 2 (Mod 2), meaning each tooth pitch diameter equals 2 × tooth count in millimeters. Bore diameter options range from plain round bores to keyway-fitted bores (see variant options), accommodating shaft diameters typically from 8mm to 30mm (~0.31–1.18 in). Tooth counts span 10 to 120 teeth, giving you a gear ratio range of 12:1 in a single product family.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include: CNC rack-and-pinion linear drives where a Mod 2 pinion meshes with a matching rack for precise X\/Y axis travel; 3D printer extruder and Z-axis lead-screw drives requiring a compact, low-backlash steel pinion gear; and light industrial conveyor or rotary indexing systems where a 45# steel spur gear with keyway bore provides positive shaft engagement without set-screw slippage.\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 Meshes with any Mod 2 spur gear, rack, or worm wheel. Verify bore diameter and keyway dimensions match your shaft before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 2 Modulus 45# Steel Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\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# structural steel for reliable hardness, wear resistance, and dimensional stability under continuous rotational load — without the brittleness of hardened tool steel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eModule 2 Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eStandard Mod 2 involute tooth form ensures smooth meshing with any compatible Mod 2 counterpart — rack, pinion, or gear — with predictable backlash and load distribution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n\u003cstrong\u003eUniform 20mm Face Width\u003c\/strong\u003e\n\u003cp\u003eA consistent 20mm (~0.79 in) tooth face width across all tooth counts provides stable contact area and even load sharing, reducing edge stress on smaller pinions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n\u003cstrong\u003eWide Tooth Count Range: 10–120 Teeth\u003c\/strong\u003e\n\u003cp\u003eSelect from 10 to 120 teeth in a single product family, enabling gear ratios from 1:1 to 12:1 without switching module sizes or sourcing from multiple suppliers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e\n\u003cstrong\u003ePlain Bore \u0026amp; Keyway Bore Options\u003c\/strong\u003e\n\u003cp\u003eAvailable with plain round bores for set-screw mounting or keyway-fitted bores (e.g., 20mm bore + 6mm keyway) for positive, slip-free shaft engagement in higher-torque applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\n\u003cstrong\u003eCNC \u0026amp; 3D Printer Ready\u003c\/strong\u003e\n\u003cp\u003eDimensionally consistent tooth profiles and bore concentricity make these gears a direct fit for CNC rack-and-pinion systems, 3D printer drive trains, and light industrial automation builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Mod 2 Steel Spur Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\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\u003eModule (Mod)\u003c\/th\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFace Width (Thickness)\u003c\/th\u003e\n\u003ctd\u003e20mm (~0.79 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e10 – 120 Teeth (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eSee variant options (plain bore or keyway)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eInvolute, 20° pressure angle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003eMod × Teeth (e.g., 2 × 20T = 40mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eMachined, natural steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 PCS\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\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\u003eDetermine your required gear ratio first: divide the driven gear teeth by the driving pinion teeth. For a CNC rack-and-pinion, the linear travel per revolution equals π × Mod × Teeth (e.g., a 20-tooth Mod 2 pinion gives ~125.7mm per revolution). Select the tooth count that achieves your target ratio or travel distance, then confirm the resulting pitch diameter fits within your housing clearance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a plain bore and a keyway bore?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA plain bore relies on a set screw or press fit to secure the gear to the shaft — suitable for lighter loads and easy repositioning. A keyway bore uses a machined slot that accepts a key, creating a positive mechanical lock between gear and shaft. Keyway variants are recommended for higher-torque drives, reversing loads, or any application where set-screw slippage is a concern.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh with my existing Mod 2 rack or gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — as long as your existing rack or mating gear is also Module 2 with a standard 20° pressure angle involute profile, these gears will mesh correctly. Module (pitch) must match between meshing gears; mixing Mod 1.5 and Mod 2 components will result in incorrect tooth engagement and accelerated wear.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is 45# steel compared to other gear materials?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel (equivalent to C45 \/ SAE 1045) has a tensile strength of approximately 600–800 MPa in the normalized condition, making it significantly stronger than aluminum, brass, or engineering plastics. It is well-suited for moderate-load power transmission. For very high-cycle or high-shock applications, consider specifying heat-treated or case-hardened variants.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes 45# steel rust, and how should I protect it?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, 45# carbon steel will oxidize if exposed to moisture without protection. For indoor CNC and 3D printer environments, a light machine oil or grease applied to the tooth faces is sufficient. For outdoor or humid environments, consider a zinc-phosphate primer coat or periodic re-greasing. The natural machined finish is not corrosion-resistant on its own.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this gear in a 3D printer extruder or Z-axis drive?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Mod 2 steel spur gears are commonly used in 3D printer Z-axis lead-screw drives and extruder gear trains where plastic gears have worn out. Select a tooth count that matches your existing gear ratio, and choose a bore diameter that fits your motor shaft — with a keyway bore for stepper motors that use a flat-key shaft coupling.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the pitch diameter for a given tooth count?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor a Mod 2 gear, pitch diameter (PD) = Module × Number of Teeth. Examples: 10T → PD 20mm; 20T → PD 40mm; 40T → PD 80mm; 60T → PD 120mm; 100T → PD 200mm; 120T → PD 240mm. The outside diameter (OD) = PD + 2 × Module = PD + 4mm.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your tooth count and bore diameter 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\": \"Determine your required gear ratio first: divide the driven gear teeth by the driving pinion teeth. For a CNC rack-and-pinion, the linear travel per revolution equals π × Mod × Teeth. Select the tooth count that achieves your target ratio or travel distance, then confirm the resulting pitch diameter fits within your housing clearance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a plain bore and a keyway bore?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A plain bore relies on a set screw or press fit to secure the gear to the shaft. A keyway bore uses a machined slot that accepts a key, creating a positive mechanical lock. Keyway variants are recommended for higher-torque drives or reversing loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing Mod 2 rack or gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — as long as your existing rack or mating gear is also Module 2 with a standard 20° pressure angle involute profile, these gears will mesh correctly. Module must match between meshing gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is 45# steel compared to other gear materials?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel has a tensile strength of approximately 600–800 MPa in the normalized condition, making it significantly stronger than aluminum, brass, or engineering plastics. It is well-suited for moderate-load power transmission.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does 45# steel rust, and how should I protect it?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, 45# carbon steel will oxidize if exposed to moisture without protection. A light machine oil or grease applied to the tooth faces is sufficient for indoor environments. For humid environments, consider a zinc-phosphate primer coat or periodic re-greasing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear in a 3D printer extruder or Z-axis drive?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Mod 2 steel spur gears are commonly used in 3D printer Z-axis lead-screw drives and extruder gear trains. Select a tooth count that matches your existing gear ratio, and choose a bore diameter that fits your motor shaft.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the pitch diameter for a given tooth count?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For a Mod 2 gear, pitch diameter = Module × Number of Teeth. Examples: 10T → 20mm PD; 20T → 40mm PD; 40T → 80mm PD; 60T → 120mm PD; 100T → 200mm PD; 120T → 240mm PD. Outside diameter = PD + 4mm.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"45# Steel \/ 2 Modulus \/ 10 Teeth \u0026 1 PCS","offer_id":52442922647826,"sku":"GYJLTHXCDZH1304x1","price":10.17,"currency_code":"USD","in_stock":true},{"title":"45# Steel \/ 2 Modulus \/ 11 Teeth \u0026 1 PCS","offer_id":52442922680594,"sku":"GYJLTHXCDZH1305x1","price":11.83,"currency_code":"USD","in_stock":true},{"title":"45# Steel \/ 2 Modulus \/ 12 Teeth \u0026 1 PCS","offer_id":52442922713362,"sku":"GYJLTHXCDZH1306x1","price":12.65,"currency_code":"USD","in_stock":true},{"title":"45# Steel \/ 2 Modulus \/ 13 Teeth \u0026 1 PCS","offer_id":52442922746130,"sku":"GYJLTHXCDZH1307x1","price":14.39,"currency_code":"USD","in_stock":true},{"title":"45# Steel \/ 2 Modulus \/ 14 Teeth \u0026 1 PCS","offer_id":52442922778898,"sku":"GYJLTHXCDZH1308x1","price":15.37,"currency_code":"USD","in_stock":true},{"title":"45# Steel \/ 2 Modulus \/ 15 Teeth \u0026 1 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