{"product_id":"2-mod-45-steel-spur-gear-20mm-thickness-12-95-teeth-cnc-3d-printer","title":"2 Mod 45# Steel Spur Gears Pinion Gear Thickness 20mm 12 - 95 Teeth For 3D CNC","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e2 Mod 45# Steel Spur Gears — Reliable Power Transmission for CNC \u0026amp; 3D Printing\u003c\/h2\u003e\n    \u003cp\u003eWhen your CNC router, 3D printer, or robotic actuator demands consistent torque transfer without slippage or premature wear, the gear material and geometry matter enormously. Hobbyists and engineers alike struggle to find spur gears that balance dimensional accuracy with genuine mechanical strength — this 2 Module 45# carbon steel series is engineered to meet that need across a wide tooth-count range.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from 45# medium-carbon steel, a grade known for its balanced hardness and machinability. The module is 2 (metric), with a face width (thickness) of 20 mm (approximately 0.79 in). Tooth counts span from 12T to 95T, giving you pitch diameters ranging from approximately 24 mm (0.94 in) for the 12T up to 190 mm (7.48 in) for the 95T. Bore diameter varies by tooth count — see variant options for exact bore dimensions.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include: drive-train assemblies in desktop CNC milling machines requiring precise feed-rate control; extruder and Z-axis drive systems in FDM 3D printers where backlash must be minimised; and custom robotic joint mechanisms where a compact, high-strength gear pair is needed for repeatable positioning.\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 Module 2 gear systems. Pairs with any M2 rack, pinion, or mating spur gear. Verify bore diameter and keyway requirements against your shaft specification before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 2 Mod 45# Steel Spur Gears\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e — Medium-carbon steel delivers a tensile strength typically in the 600–800 MPa range, resisting deformation under sustained load far better than zinc or nylon alternatives.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eModule 2 Metric Standard\u003c\/strong\u003e — Fully interchangeable with any M2-rated rack, pinion, or mating gear, making integration into existing metric drive systems straightforward.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003e20 mm Face Width\u003c\/strong\u003e — A 20 mm (0.79 in) tooth face distributes load across a wider contact area, reducing surface stress and extending service life compared to narrower gears.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eWide Tooth-Count Range (12T–95T)\u003c\/strong\u003e — A single product line covers gear ratios from roughly 1:1 up to approximately 1:8, eliminating the need to source gears from multiple suppliers for a multi-stage gearbox.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003ePrecision-Machined Tooth Profile\u003c\/strong\u003e — Involute tooth geometry is machined to maintain consistent contact ratio across the full rotation, reducing vibration and noise in high-cycle applications.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eCorrosion-Resistant Surface\u003c\/strong\u003e — The steel surface is finished to resist light oxidation in typical workshop environments; for high-humidity or outdoor use, apply a light machine oil film as standard practice.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — 2 Mod Steel Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e2 (Metric)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFace Width (Thickness)\u003c\/th\u003e\n\u003ctd\u003e20 mm (0.79 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e12T – 95T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003eModule × Teeth (e.g. 2 × 20T = 40 mm)\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\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eInvolute\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eMachined, lightly deburred\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\u003eDetermine your required gear ratio first: divide the driven shaft speed by the driving shaft speed. For example, a 3:1 reduction with a 20T pinion requires a 60T gear. Then confirm the resulting pitch diameter (Module × Teeth) fits within your housing clearance. Use the formula: Pitch Diameter (mm) = Module × Number of Teeth.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the bore diameter for each tooth count?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count and is listed in the variant options on this page. Smaller tooth counts (12T–20T) typically have smaller bores, while larger gears accommodate larger shaft diameters. If you need a custom bore size, the steel is machinable and can be bored out by a local machine shop.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears strong enough for CNC router feed drives?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 45# carbon steel has a typical tensile strength of 600–800 MPa and yield strength around 355 MPa, which is well-suited for the intermittent, moderate-torque loads found in desktop and mid-size CNC router feed systems. For heavy industrial cutting with continuous high-torque demand, consider a hardened or alloy steel gear.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these gears rust or corrode?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel will oxidise if left unprotected in humid or wet environments. For typical indoor workshop use, the machined surface provides adequate short-term protection. Apply a thin coat of machine oil or anti-rust spray if the gear will be stored or used in a high-humidity environment. For outdoor or washdown applications, consider stainless steel gears instead.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this gear with a Module 2 rack for linear motion?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any Module 2 spur gear in this range will mesh correctly with a Module 2 rack (straight or helical rack with the same normal module). Ensure the rack's pressure angle also matches 20° for proper tooth engagement and minimal backlash.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I calculate the centre distance between two meshing gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCentre distance = (Pitch Diameter of Gear 1 + Pitch Diameter of Gear 2) ÷ 2. For example, a 20T and a 40T Module 2 gear pair: (40 mm + 80 mm) ÷ 2 = 60 mm centre distance. Always add a small clearance (typically 0.1–0.2 mm) to account for manufacturing tolerances and thermal expansion.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs a keyway or set-screw hole included?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eKeyway and set-screw configurations vary by tooth count and are noted in the variant details. If the listing does not specify a keyway, the bore is plain (smooth). A set-screw or keyway can be added by a machine shop if required for your shaft retention method.\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 tooth count (Model) 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 shaft speed by the driving shaft speed. For example, a 3:1 reduction with a 20T pinion requires a 60T gear. Then confirm the resulting pitch diameter (Module × Teeth) fits within your housing clearance. Use the formula: Pitch Diameter (mm) = Module × Number of Teeth.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the bore diameter for each tooth count?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count and is listed in the variant options on this page. Smaller tooth counts typically have smaller bores, while larger gears accommodate larger shaft diameters. The steel is machinable and can be bored out by a local machine shop if a custom bore size is needed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears strong enough for CNC router feed drives?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. 45# carbon steel has a typical tensile strength of 600–800 MPa and yield strength around 355 MPa, well-suited for the intermittent, moderate-torque loads found in desktop and mid-size CNC router feed systems.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears rust or corrode?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel will oxidise if left unprotected in humid or wet environments. Apply a thin coat of machine oil or anti-rust spray for high-humidity storage or use. For outdoor or washdown applications, consider stainless steel gears instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear with a Module 2 rack for linear motion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any Module 2 spur gear in this range will mesh correctly with a Module 2 rack. Ensure the rack's pressure angle also matches 20° for proper tooth engagement and minimal backlash.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I calculate the centre distance between two meshing gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Centre distance = (Pitch Diameter of Gear 1 + Pitch Diameter of Gear 2) ÷ 2. For example, a 20T and a 40T Module 2 gear pair: (40 mm + 80 mm) ÷ 2 = 60 mm centre distance. Add 0.1–0.2 mm clearance for manufacturing tolerances.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is a keyway or set-screw hole included?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Keyway and set-screw configurations vary by tooth count and are noted in the variant details. If not specified, the bore is plain (smooth). A keyway or set-screw can be added by a machine shop if required.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2 Mod 12T","offer_id":52442081460498,"sku":"QTLJJGJXCD0296x1","price":13.03,"currency_code":"USD","in_stock":true},{"title":"2 Mod 13T","offer_id":52442081493266,"sku":"QTLJJGJXCD0297x1","price":14.77,"currency_code":"USD","in_stock":true},{"title":"2 Mod 14T","offer_id":52442081526034,"sku":"QTLJJGJXCD0298x1","price":15.78,"currency_code":"USD","in_stock":true},{"title":"2 Mod 15T","offer_id":52442081558802,"sku":"QTLJJGJXCD0299x1","price":17.63,"currency_code":"USD","in_stock":true},{"title":"2 Mod 16T","offer_id":52442081591570,"sku":"QTLJJGJXCD0300x1","price":19.67,"currency_code":"USD","in_stock":true},{"title":"2 Mod 17T","offer_id":52442081624338,"sku":"QTLJJGJXCD0301x1","price":20.75,"currency_code":"USD","in_stock":true},{"title":"2 Mod 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