{"product_id":"mod-1-5-spur-gear-stainless-steel-12-30-tooth-motor-pinion-flat-gear-precision","title":"Mod 1.5 Spur Gear Stainless Steel 12 - 30 Tooth Motor Pinion Flat Gear Precision","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eMod 1.5 Stainless Steel Spur Gear — Precision Pinion Flat Gear for Motors \u0026amp; Drives\u003c\/h2\u003e\n    \u003cp\u003eWhen a stripped or undersized gear brings your motor drive, robotic arm, or CNC axis to a halt, you need a replacement that fits exactly and holds up under load. These Mod 1.5 stainless steel spur gears are engineered for makers, automation builders, and mechanical engineers who cannot afford slop, backlash, or corrosion in their drivetrain.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from stainless steel and finished to Module 1.5 (1.5 mm\/tooth pitch) standards. The tooth count spans 12 to 30 teeth, and bore sizes range from 8 mm (0.31 in) to 20 mm (0.79 in), each paired with a precision-cut keyway (3–6 mm depending on bore) for positive torque transmission. Face width is typically 10–15 mm (0.39–0.59 in); overall gear diameter scales with tooth count per standard module geometry.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DC motor pinion drives in robotics and automation, lead-screw or rack-and-pinion CNC axis drives, and gear-reduction stages in custom gearboxes where a compact, corrosion-resistant Mod 1.5 spur gear is required.\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 standard Module 1.5 spur gear, rack, or pinion. 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 Mod 1.5 Stainless 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\u003eStainless Steel Construction\u003c\/strong\u003e — Resists oxidation and mild corrosion, suitable for exposed or humid environments without surface treatment.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eModule 1.5 Precision Tooth Profile\u003c\/strong\u003e — Standard involute tooth geometry ensures smooth, low-noise meshing with any compatible Mod 1.5 counterpart gear or rack.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eWide Tooth Count Range (12–30T)\u003c\/strong\u003e — Twelve tooth-count options let you dial in the exact gear ratio you need without custom machining.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e\u003cstrong\u003eKeyway Bore for Positive Drive\u003c\/strong\u003e — Bore sizes from 8 mm to 20 mm, each with a matching keyway (3–6 mm), eliminate shaft slip under dynamic or reversing loads.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cstrong\u003eCompact, Lightweight Profile\u003c\/strong\u003e — Flat spur gear geometry keeps axial length short, ideal for space-constrained motor pinion and gearbox applications.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\u003cstrong\u003eConsistent Dimensional Accuracy\u003c\/strong\u003e — Machined to repeatable tolerances so gears from the same module series interchange without re-shimming or re-alignment.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Mod 1.5 Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e12 \/ 13 \/ 14 \/ 15 \/ 16 \/ 18 \/ 20 \/ 22 \/ 24 \/ 25 \/ 28 \/ 30\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e8 mm \/ 10 mm \/ 12 mm \/ 14 mm \/ 15 mm \/ 16 mm \/ 17 mm \/ 18 mm \/ 19 mm \/ 20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway Width\u003c\/th\u003e\n\u003ctd\u003e3 mm (8 mm bore) \/ 4 mm (10–12 mm bore) \/ 5 mm (14–17 mm bore) \/ 6 mm (18–20 mm bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eStandard Involute (20° pressure angle)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch (Circular)\u003c\/th\u003e\n\u003ctd\u003e≈ 4.712 mm (Module 1.5 × π)\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\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eMachined, natural stainless\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur (Flat \/ Pinion)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSold As\u003c\/th\u003e\n\u003ctd\u003e1 piece per unit\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\u003eSelect the tooth count based on your required gear ratio. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For motor pinion applications, smaller tooth counts (12–16T) give higher reduction; larger counts (24–30T) are used when the pinion is the larger gear in the pair. Confirm the resulting pitch circle diameter fits within your housing clearance.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat bore size and keyway should I order?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or shaft diameter precisely with calipers. Choose the bore that matches your shaft (e.g., 10 mm shaft → 10 mm bore with 4 mm keyway). The keyway width is fixed per bore size: 3 mm for 8 mm bore, 4 mm for 10–12 mm bore, 5 mm for 14–17 mm bore, and 6 mm for 18–20 mm bore. Use a matching key stock to lock the gear to the shaft.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear mesh with my existing Module 1.5 gears or rack?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. All gears in the Module 1.5 series share the same tooth pitch and pressure angle (20° involute), so they mesh directly with any other Mod 1.5 spur gear, pinion, or rack regardless of tooth count. Ensure center distance is set correctly: center distance = (T1 + T2) × Module \/ 2.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong is stainless steel for gear applications?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStainless steel offers good tensile strength (typically 515–620 MPa for 304-grade) and is well-suited for light-to-medium duty drives, robotics, and automation where corrosion resistance matters. For very high-torque or heavy industrial applications, consider whether a hardened steel or alloy gear would better suit your load requirements.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this gear corrosion-resistant for outdoor or wet environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStainless steel provides inherent corrosion resistance against moisture, mild chemicals, and humidity without additional coating. It is suitable for outdoor robotics, food-adjacent machinery, and marine-adjacent environments. For highly aggressive chemical exposure, verify the specific stainless alloy grade meets your requirements.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this as a motor pinion gear directly on a DC or stepper motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, provided the motor shaft diameter matches the bore size you select and you use the appropriate key stock in the keyway. Confirm the motor shaft has a keyway machined into it, or plan to use a set-screw collar alongside the keyed bore for additional retention. The flat spur gear profile is ideal for compact motor pinion configurations.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I calculate the pitch circle diameter for a given tooth count?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePitch Circle Diameter (PCD) = Module × Tooth Count. For Module 1.5: a 12-tooth gear has PCD = 18 mm, a 20-tooth gear has PCD = 30 mm, and a 30-tooth gear has PCD = 45 mm. The outside diameter (tip circle) = PCD + 2 × Module = PCD + 3 mm.\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 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\": \"Select the tooth count based on your required gear ratio. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For motor pinion applications, smaller tooth counts (12–16T) give higher reduction; larger counts (24–30T) are used when the pinion is the larger gear in the pair.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore size and keyway should I order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or shaft diameter precisely with calipers. Choose the bore that matches your shaft. The keyway width is fixed per bore size: 3 mm for 8 mm bore, 4 mm for 10–12 mm bore, 5 mm for 14–17 mm bore, and 6 mm for 18–20 mm bore.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing Module 1.5 gears or rack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. All gears in the Module 1.5 series share the same tooth pitch and pressure angle (20° involute), so they mesh directly with any other Mod 1.5 spur gear, pinion, or rack regardless of tooth count.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is stainless steel for gear applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Stainless steel offers good tensile strength (typically 515–620 MPa for 304-grade) and is well-suited for light-to-medium duty drives, robotics, and automation where corrosion resistance matters.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this gear corrosion-resistant for outdoor or wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Stainless steel provides inherent corrosion resistance against moisture, mild chemicals, and humidity without additional coating. It is suitable for outdoor robotics, food-adjacent machinery, and marine-adjacent environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this as a motor pinion gear directly on a DC or stepper motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, provided the motor shaft diameter matches the bore size you select and you use the appropriate key stock in the keyway. The flat spur gear profile is ideal for compact motor pinion configurations.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I calculate the pitch circle diameter for a given tooth count?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Pitch Circle Diameter (PCD) = Module × Tooth Count. For Module 1.5: a 12-tooth gear has PCD = 18 mm, a 20-tooth gear has PCD = 30 mm, and a 30-tooth gear has PCD = 45 mm. Outside diameter = PCD + 3 mm.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Module 1.5【12 Tooth】 \/ 8mm + 3mm Keyway \/ 1 pcs","offer_id":52441976504594,"sku":"PENGJGJXCD3791x1","price":17.92,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【13 Tooth】 \/ 8mm + 3mm Keyway \/ 1 pcs","offer_id":52441976537362,"sku":"PENGJGJXCD3792x1","price":18.9,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【14 Tooth】 \/ 8mm + 3mm Keyway \/ 1 pcs","offer_id":52441976570130,"sku":"PENGJGJXCD3793x1","price":19.99,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【15 Tooth】 \/ 8mm + 3mm Keyway \/ 1 pcs","offer_id":52441976602898,"sku":"PENGJGJXCD3794x1","price":20.54,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【15 Tooth】 \/ 10mm + 4mm Keyway \/ 1 pcs","offer_id":52441976635666,"sku":"PENGJGJXCD3795x1","price":20.26,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【16 Tooth】 \/ 8mm + 3mm Keyway \/ 1 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