{"product_id":"straight-spur-gear-45-steel-1-5-mod-12-27-teeth-motor-transmission-gear","title":"Straight Spur Gear 45# Steel 1.5 Mod 12-27 Teeth Motor Transmission Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eStraight Spur Gear 1.5 Mod 45# Steel — Reliable Torque Transfer for Motor Transmission Builds\u003c\/h2\u003e\n\u003cp\u003eWhen a motion-control project demands consistent torque transfer and dimensional accuracy, undersized or poorly machined gears become the weak link. Engineers, CNC builders, and robotics makers who need a dependable 1.5 module straight spur gear will find this 45# steel option covers the most common shaft and tooth-count combinations in a single listing.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel, offering a balance of hardness and machinability suited to moderate-to-high load applications. The module is 1.5 (pitch = 4.712 mm), tooth counts range from 12 T to 27 T, and bore diameters span 6 mm to 18 mm (approximately 0.24 in to 0.71 in). Select keyway (KWY) variants include a pre-cut keyway slot (4 mm or 5 mm or 6 mm width) for positive shaft locking without set-screw slippage.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DC motor output stages in CNC router Z-axis drives, gear-reduction stages in robotic arm joints requiring a 1.5 mod spur gear for torque multiplication, and replacement transmission gears in small industrial automation equipment where standard metric module gearing is specified.\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 mating with any standard 1.5 module (Mod 1.5) spur or rack gear. Verify bore diameter and keyway dimensions match your shaft before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These 1.5 Mod Straight Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from 45# steel for a tensile strength typically in the 600–800 MPa range, providing durability under cyclic loading in motor transmission and drive applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eModule 1.5 — Wide Tooth-Count Range\u003c\/strong\u003e\n\u003cp\u003eCovers 12 T through 27 T in a single listing, letting you select the exact gear ratio stage you need without sourcing from multiple suppliers.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003eMultiple Bore Sizes (6–18 mm)\u003c\/strong\u003e\n\u003cp\u003eBore options from 6 mm to 18 mm (≈ 0.24–0.71 in) accommodate common motor shaft diameters used in NEMA 17\/23 steppers, DC gearmotors, and servo output shafts.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔑\u003c\/div\u003e\n\u003cstrong\u003eOptional Pre-Cut Keyway Variants\u003c\/strong\u003e\n\u003cp\u003eKWY variants include a machined keyway slot (4 mm, 5 mm, or 6 mm width depending on bore) for positive rotational locking — eliminating set-screw-only retention on high-torque shafts.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003cstrong\u003eSingle or 4-Pack Quantity Options\u003c\/strong\u003e\n\u003cp\u003eAvailable in packs of 1 or 4, making it straightforward to stock spares or build multi-stage gear trains without placing separate orders.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚡\u003c\/div\u003e\n\u003cstrong\u003eStraight-Cut Tooth Profile for Low-Noise Operation\u003c\/strong\u003e\n\u003cp\u003eStandard straight spur tooth geometry transmits power efficiently along parallel shafts and produces no axial thrust load, simplifying bearing selection in compact drive assemblies.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — 1.5 Mod Straight Spur Gear\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule (Mod)\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 T – 27 T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6 mm – 18 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003e18 mm – 40.5 mm (Mod × Teeth)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard)\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\u003eSurface Finish\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\u003eAvailable on select variants (4 mm \/ 5 mm \/ 6 mm width)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eStraight Spur Gear\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\u003eHub Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 or 4 (see variant options)\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\u003eThe tooth count determines the gear ratio when paired with a mating gear. Divide the driven gear teeth by the driving gear teeth to get the ratio. For example, pairing a 12 T drive gear with a 24 T driven gear gives a 2:1 reduction. Select the combination that achieves your target RPM or torque output.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I select for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor shaft diameter with a caliper. Choose the bore that matches exactly — a bore that is too large will cause runout and vibration. Common stepper motor shafts are 5 mm, 6.35 mm, or 8 mm; DC gearmotor output shafts are often 6 mm, 8 mm, or 10 mm. If your shaft is between listed sizes, consider a keyway variant with the next bore up and use a key for positive locking.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a keyway variant, or will a set screw hold?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor low-torque or intermittent-duty applications, a set screw on a standard bore is often sufficient. For continuous high-torque loads or reversing drives, a keyway variant provides positive rotational locking and prevents the gear from spinning on the shaft under shock loads. If your application involves frequent direction changes or high peak torque, choose a KWY variant.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the corrosion resistance of 45# steel gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# medium-carbon steel is not inherently corrosion-resistant. In dry indoor environments (CNC machines, robotics enclosures) surface oxidation is minimal. For humid or outdoor environments, apply a light machine oil or grease coating to the gear teeth and bore. If corrosion resistance is a primary requirement, consider stainless steel or nylon gear alternatives.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears compatible with standard metric module racks and pinions?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any gear or rack manufactured to the Mod 1.5 standard with a 20° pressure angle will mesh correctly with these gears. This includes Mod 1.5 racks used in CNC router linear drives and Mod 1.5 pinion gears used in rotary stages.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat load capacity can I expect from a 1.5 Mod 45# steel spur gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLoad capacity depends on tooth count, face width, operating speed, and lubrication. As a conservative guideline, Mod 1.5 steel spur gears in this size range are suitable for transmitted tangential loads of approximately 50–300 N depending on tooth count and RPM. For precise load calculations, apply AGMA or ISO 6336 gear rating standards using the actual face width of your selected variant.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eShould I buy a single gear or the 4-pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eIf you are prototyping or replacing a single failed gear, the single-piece option is the most cost-effective. If you are building a multi-stage gear train, stocking spares for a production machine, or running a small batch of assemblies, the 4-pack offers a lower per-unit cost and reduces reorder frequency.\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 Specification (tooth count, bore size, and keyway option) and Pack quantity 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\": \"The tooth count determines the gear ratio when paired with a mating gear. Divide the driven gear teeth by the driving gear teeth to get the ratio. For example, pairing a 12 T drive gear with a 24 T driven gear gives a 2:1 reduction. Select the combination that achieves your target RPM or torque output.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore size should I select for my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor shaft diameter with a caliper. Choose the bore that matches exactly. Common stepper motor shafts are 5 mm, 6.35 mm, or 8 mm; DC gearmotor output shafts are often 6 mm, 8 mm, or 10 mm. If your shaft is between listed sizes, consider a keyway variant with the next bore up and use a key for positive locking.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a keyway variant, or will a set screw hold?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For low-torque or intermittent-duty applications, a set screw on a standard bore is often sufficient. For continuous high-torque loads or reversing drives, a keyway variant provides positive rotational locking and prevents the gear from spinning on the shaft under shock loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the corrosion resistance of 45# steel gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# medium-carbon steel is not inherently corrosion-resistant. In dry indoor environments surface oxidation is minimal. For humid or outdoor environments, apply a light machine oil or grease coating to the gear teeth and bore.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears compatible with standard metric module racks and pinions?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any gear or rack manufactured to the Mod 1.5 standard with a 20° pressure angle will mesh correctly with these gears, including Mod 1.5 racks used in CNC router linear drives.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What load capacity can I expect from a 1.5 Mod 45# steel spur gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"As a conservative guideline, Mod 1.5 steel spur gears in this size range are suitable for transmitted tangential loads of approximately 50–300 N depending on tooth count and RPM. For precise load calculations, apply AGMA or ISO 6336 gear rating standards.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Should I buy a single gear or the 4-pack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If you are prototyping or replacing a single failed gear, the single-piece option is the most cost-effective. If you are building a multi-stage gear train or stocking spares, the 4-pack offers a lower per-unit cost and reduces reorder frequency.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1.5Mod 12T Bore 6mm \/ 1","offer_id":52442481131794,"sku":"GLFBNHHJGJXCD0432x1","price":11.63,"currency_code":"USD","in_stock":true},{"title":"1.5Mod 12T Bore 8mm \/ 1","offer_id":52442481164562,"sku":"GLFBNHHJGJXCD0433x1","price":11.63,"currency_code":"USD","in_stock":true},{"title":"1.5Mod 14T Bore 6mm \/ 1","offer_id":52442481197330,"sku":"GLFBNHHJGJXCD0434x1","price":11.63,"currency_code":"USD","in_stock":true},{"title":"1.5Mod 14T Bore 8mm \/ 1","offer_id":52442481230098,"sku":"GLFBNHHJGJXCD0435x1","price":11.63,"currency_code":"USD","in_stock":true},{"title":"1.5Mod 15T Bore 6mm \/ 1","offer_id":52442481262866,"sku":"GLFBNHHJGJXCD0436x1","price":12.23,"currency_code":"USD","in_stock":true},{"title":"1.5Mod 15T Bore 8mm \/ 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