{"product_id":"cylindrical-spur-gear-2mod-27-100t-6-28mm-tooth-pitch-58mm-204mm-od-motor-pinion","title":"Cylindrical Spur Gear 2Mod 27-100T 6.28mm Tooth Pitch 58mm-204mm OD Motor Pinion","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eCylindrical Spur Gear 2Mod — Precision Motor Pinion for DIY Drive Systems\u003c\/h2\u003e\n\u003cp\u003eWhen your project demands reliable power transmission with consistent tooth engagement, finding a spur gear that matches your motor shaft and driven component can be a frustrating search. Whether you are a robotics builder, a CNC hobbyist, or a mechanical engineer prototyping a custom gearbox, these 2 Module cylindrical spur gears give you a wide tooth-count selection in a single, standardised pitch family.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined to a 2 Module (Mod 2) standard with a tooth pitch of 6.28 mm (≈ 0.247 in). The available outer diameter range spans 58 mm to 204 mm (approximately 2.28 in to 8.03 in), covering tooth counts from 27T up to 100T. Bore diameter and face width vary by tooth count — see variant options for confirmed bore dimensions.\u003c\/p\u003e\n\u003cp\u003eTypical applications include motor-to-gearbox pinion drives in 3D printer extruder assemblies, speed-reduction stages in electric go-kart drivetrains, rotary indexing tables for DIY CNC routers, and torque-multiplication stages in robotic arm joints requiring a compact 2 Mod gear mesh.\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 standard Mod 2 gear mesh. Pairs with any Mod 2 mating gear, rack, or pinion. Confirm bore diameter against your shaft size before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Cylindrical Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚙️\u003cstrong\u003e2 Module Standard Tooth Profile\u003c\/strong\u003e\u003cp\u003e6.28 mm tooth pitch ensures direct mesh compatibility with any Mod 2 counterpart gear or rack without custom modification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003cstrong\u003eWide Tooth-Count Range: 27T – 100T\u003c\/strong\u003e\u003cp\u003e42 size options from 58 mm to 204 mm OD let you dial in your exact gear ratio without compromising on centre distance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003cstrong\u003eCylindrical Bore Design\u003c\/strong\u003e\u003cp\u003eStraight cylindrical bore accepts standard round shafts; bore diameter varies by tooth count — see variant options for confirmed dimensions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏗️\u003cstrong\u003eRigid Tooth Geometry\u003c\/strong\u003e\u003cp\u003eFull-depth involute tooth form distributes load evenly across the face width, reducing stress concentration during sustained torque transmission.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003cstrong\u003eLow-Backlash Mesh\u003c\/strong\u003e\u003cp\u003eMachined to close tolerances to minimise angular play, making these gears suitable for positioning applications where repeatability matters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛠️\u003cstrong\u003eBroad Application Fit\u003c\/strong\u003e\u003cp\u003eSuited for motor pinion drives, robotics joints, CNC axis drives, conveyor reduction stages, and custom gearbox builds across maker and light-industrial projects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Cylindrical Spur Gears\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e2 (Mod 2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Pitch\u003c\/th\u003e\n\u003ctd\u003e6.28 mm (≈ 0.247 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e27T – 100T (42 variants)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003e58 mm – 204 mm (2.28 in – 8.03 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eInvolute, full-depth\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\u003eFace Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish \/ Coating\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eCylindrical Spur Gear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold As\u003c\/th\u003e\n\u003ctd\u003e1 piece per order\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\u003eYour gear ratio is determined by dividing the driven gear tooth count by the driving gear tooth count. For example, pairing a 27T motor pinion with a 54T output gear gives a 2:1 reduction. Measure your available centre distance first, then use the formula: Centre Distance = (T1 + T2) × Module \/ 2 to confirm the pair fits your housing.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does \"2 Mod\" or \"Module 2\" mean?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eModule is the standardised metric unit for gear tooth size. A Module 2 gear has a tooth pitch of 6.28 mm (π × 2). Two gears must share the same module and pressure angle to mesh correctly. These gears are all Mod 2 \/ 20° pressure angle and will mesh with any other Mod 2 spur gear or rack.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I confirm the bore diameter fits my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count and is listed in the individual variant details. Measure your motor or drive shaft diameter with a vernier calliper before ordering. If you need a custom bore size, a standard lathe boring operation can open the bore — leave at least 2–3 mm of wall material between the bore and the root circle for structural integrity.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears suitable for outdoor or corrosive environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCorrosion resistance depends on the material and finish of the specific variant you select. For outdoor or humid environments, choose variants with a zinc-plated, black-oxide, or stainless finish where available. If operating in a wet environment, periodic lubrication with a water-resistant grease is recommended regardless of finish.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the maximum torque or load these gears can handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLoad capacity depends on tooth count, face width, material, and operating speed — all of which vary by variant. As a conservative guideline for Mod 2 steel spur gears, tangential tooth load typically ranges from 50 N to 500 N depending on face width and speed. For critical load calculations, apply AGMA or ISO 6336 gear strength standards using the confirmed face width and material data from your chosen variant.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these as a direct motor pinion on a brushless DC motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — smaller tooth counts (27T–35T) are commonly used as motor pinions. Confirm the bore diameter matches your motor shaft, and check that the OD clears your motor housing. A keyway or set-screw collar is recommended for positive shaft retention under reversing loads.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these gears require lubrication during operation?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSpur gears operating under load benefit from lubrication to reduce wear and heat. For enclosed gearboxes, an ISO VG 220 gear oil or lithium-based grease is suitable. For open drives running at low speed, a light application of grease to the tooth flanks every 50–100 operating hours is a practical maintenance interval.\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 (OD) 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\": \"Your gear ratio is determined by dividing the driven gear tooth count by the driving gear tooth count. Use the formula: Centre Distance = (T1 + T2) × Module \/ 2 to confirm the pair fits your housing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does '2 Mod' or 'Module 2' mean?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Module is the standardised metric unit for gear tooth size. A Module 2 gear has a tooth pitch of 6.28 mm. Two gears must share the same module and pressure angle to mesh correctly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I confirm the bore diameter fits my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count and is listed in the individual variant details. Measure your motor or drive shaft diameter with a vernier calliper before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears suitable for outdoor or corrosive environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Corrosion resistance depends on the material and finish of the specific variant. For outdoor or humid environments, choose variants with a zinc-plated, black-oxide, or stainless finish where available.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the maximum torque or load these gears can handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Load capacity depends on tooth count, face width, material, and operating speed. For critical load calculations, apply AGMA or ISO 6336 gear strength standards using the confirmed face width and material data from your chosen variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these as a direct motor pinion on a brushless DC motor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — smaller tooth counts (27T–35T) are commonly used as motor pinions. Confirm the bore diameter matches your motor shaft and check that the OD clears your motor housing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do these gears require lubrication during operation?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Spur gears operating under load benefit from lubrication. For enclosed gearboxes, an ISO VG 220 gear oil or lithium-based grease is suitable. For open drives, apply grease to tooth flanks every 50–100 operating hours.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2 Mod \/ 51T (106mm)","offer_id":52442379911442,"sku":"GLFBLFFSHXJZC4608x1","price":141.78,"currency_code":"USD","in_stock":true},{"title":"2 Mod \/ 52T (108mm)","offer_id":52442379944210,"sku":"GLFBLFFSHXJZC4609x1","price":146.43,"currency_code":"USD","in_stock":true},{"title":"2 Mod \/ 53T (110mm)","offer_id":52442379976978,"sku":"GLFBLFFSHXJZC4610x1","price":152.4,"currency_code":"USD","in_stock":true},{"title":"2 Mod \/ 54T (112mm)","offer_id":52442380009746,"sku":"GLFBLFFSHXJZC4611x1","price":157.43,"currency_code":"USD","in_stock":true},{"title":"2 Mod \/ 55T (114mm)","offer_id":52442380042514,"sku":"GLFBLFFSHXJZC4612x1","price":163.95,"currency_code":"USD","in_stock":true},{"title":"2 Mod \/ 56T 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