{"product_id":"spur-gear-c45-steel-mod-3-hub-12-40-tooth-hardened-8-40mm-bore","title":"Spur Gear C45 Steel Mod 3 with Hub 12-40 Tooth Motor Pinion Hardened 8-40mm Bore","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eModule 3 C45 Steel Spur Gear with Hub — Precision-Machined for CNC, Robotics \u0026amp; Automation\u003c\/h2\u003e\n    \u003cp\u003eWhen your motion-control build demands a gear that fits precisely, transmits torque reliably, and holds up under continuous load, a loose-tolerance blank simply won't do. Engineers, makers, and machine builders working on CNC routers, conveyor drives, robotic arms, and industrial automation rigs need a spur gear that arrives ready to mount — with a finished bore, a matching keyway, and a hub that keeps the gear centered on the shaft.\u003c\/p\u003e\n    \u003cp\u003eThese Module 3 spur gears are machined from C45 medium-carbon steel and surface-hardened for wear resistance. The gear body spans a tooth count range of 12 to 40 teeth, with an outer diameter that scales accordingly — from approximately 42 mm (1.65 in) for the 12-tooth up to approximately 126 mm (4.96 in) for the 40-tooth. Bore options run from 8 mm pilot-hole roughing blanks up to 40 mm finished bores with keyways sized to DIN 6885 standards (4 mm, 5 mm, 6 mm, 8 mm, 10 mm, or 12 mm depending on bore diameter). The integrated hub adds axial support and simplifies shaft-collar or set-screw retention.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include motor-pinion drives on CNC gantry systems, stage-1 reduction gears in servo-driven conveyor lines, and replacement gears for industrial automation equipment requiring Module 3 pitch. The hardened tooth surface makes these gears well-suited for continuous-duty applications where a standard mild-steel gear would wear prematurely.\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 Module 3 (Mod 3) spur or helical gear of matching pressure angle (20°). Verify center distance and face width before installation. Pilot-hole variants require finish boring to your shaft diameter.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Module 3 C45 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\u003eC45 Medium-Carbon Steel Construction\u003c\/strong\u003e\n        \u003cp\u003eMachined from C45 steel (equivalent to 1045 carbon steel), offering a tensile strength of approximately 600–800 MPa — a reliable balance of machinability and load-bearing capacity for power-transmission gears.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n        \u003cstrong\u003eSurface-Hardened Teeth\u003c\/strong\u003e\n        \u003cp\u003eTooth flanks are hardened to extend service life under repetitive mesh loading, reducing pitting and surface fatigue compared to through-soft gears in the same material class.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eIntegrated Hub Design\u003c\/strong\u003e\n        \u003cp\u003eThe raised hub provides additional axial bearing surface and simplifies clamping with shaft collars or set screws, keeping the gear concentric and reducing wobble under dynamic loads.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e\n        \u003cstrong\u003eFinished Bore with DIN Keyway\u003c\/strong\u003e\n        \u003cp\u003eKeyed bore variants are finish-machined to H7 tolerance and include a keyway sized to DIN 6885 — ready to mount on a keyed shaft without additional machining. Pilot-hole variants are available for custom boring.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n        \u003cstrong\u003eWide Tooth-Count Selection (12–40 Teeth)\u003c\/strong\u003e\n        \u003cp\u003eSixteen tooth-count options from 12T to 40T let you dial in your gear ratio precisely. All share the same Module 3 pitch, so mixing tooth counts within a stage is straightforward.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eBroad Bore Range (8–40 mm)\u003c\/strong\u003e\n        \u003cp\u003eBore options from 8 mm up to 40 mm cover the most common motor and gearbox output shaft diameters used in servo, stepper, and AC induction motor applications.\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 — Module 3 Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e3\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\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e12 – 40 Teeth\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eC45 Medium-Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Treatment\u003c\/th\u003e\n\u003ctd\u003eSurface Hardened\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Range\u003c\/th\u003e\n\u003ctd\u003e8 mm – 40 mm (Pilot Hole or Finished with Keyway)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway Standard\u003c\/th\u003e\n\u003ctd\u003eDIN 6885 (where applicable)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003eSee variant options (scales with tooth count)\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\u003eHub Included\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 pcs (default); multi-pack options available\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 tooth counts based on your required gear ratio. Divide the driven gear teeth by the driving gear teeth to get the ratio. For example, a 12-tooth pinion meshing with a 36-tooth gear gives a 3:1 reduction. All gears in this listing share Module 3 pitch, so any two tooth counts can mesh together as long as center distance and face width are compatible.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between a Pilot Hole variant and a keyed bore variant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePilot Hole (Roughing) variants have a small center hole and require finish boring on a lathe or machining center to your exact shaft diameter. Keyed bore variants are already finish-machined to a specific bore diameter with a DIN 6885 keyway, ready to mount on a matching keyed shaft without additional machining.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears strong enough for continuous-duty power transmission?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eC45 steel with surface-hardened teeth is suitable for moderate to heavy continuous-duty applications. The hardened tooth flanks resist pitting and surface fatigue. For very high shock loads or extreme-duty cycles, consider specifying a higher alloy steel or a heat-treated variant. Contact us if you need load-capacity calculations for your specific application.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these gears corrode in humid or outdoor environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eC45 carbon steel is not inherently corrosion-resistant. For humid, wet, or outdoor environments, apply a rust-inhibiting coating, grease, or oil film after installation. If corrosion resistance is a primary requirement, consider stainless steel or plastic gears instead.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these gears with a helical gear of the same module?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSpur gears and helical gears of the same module and pressure angle can mesh, but only if the helical gear has a helix angle close to 0° (i.e., effectively spur). Standard helical gears have a helix angle that changes the effective pitch and prevents direct meshing with spur gears. For best results, mesh Module 3 spur gears with other Module 3 spur gears.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I verify the keyway size matches my shaft key?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eKeyway dimensions follow DIN 6885 standards and are determined by bore diameter. For example, a 12 mm bore uses a 4 mm key, a 16–22 mm bore uses a 5–6 mm key, and a 25–32 mm bore uses an 8 mm key. Check the variant name for the bore + keyway combination (e.g., \"16mm + 5mm Keyway\") and match it to your shaft key dimensions before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat lubrication is recommended for these spur gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor enclosed gearboxes, use an ISO VG 220 or VG 320 gear oil. For open drives or light-duty applications, a lithium-based grease (NLGI Grade 2) applied to the tooth flanks is sufficient. Re-lubricate at regular intervals based on operating speed and load. Avoid running the gears dry, as this accelerates tooth wear.\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 Models (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 tooth counts based on your required gear ratio. Divide the driven gear teeth by the driving gear teeth to get the ratio. All gears share Module 3 pitch, so any two tooth counts can mesh together as long as center distance and face width are compatible.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a Pilot Hole variant and a keyed bore variant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Pilot Hole variants require finish boring to your exact shaft diameter. Keyed bore variants are finish-machined with a DIN 6885 keyway, ready to mount on a matching keyed shaft without additional machining.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears strong enough for continuous-duty power transmission?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C45 steel with surface-hardened teeth is suitable for moderate to heavy continuous-duty applications. The hardened tooth flanks resist pitting and surface fatigue.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears corrode in humid or outdoor environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C45 carbon steel is not inherently corrosion-resistant. Apply a rust-inhibiting coating, grease, or oil film after installation for humid or outdoor environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears with a helical gear of the same module?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Standard helical gears have a helix angle that prevents direct meshing with spur gears. For best results, mesh Module 3 spur gears with other Module 3 spur gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I verify the keyway size matches my shaft key?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Keyway dimensions follow DIN 6885 standards. Check the variant name for the bore + keyway combination (e.g., '16mm + 5mm Keyway') and match it to your shaft key dimensions before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What lubrication is recommended for these spur gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For enclosed gearboxes, use ISO VG 220 or VG 320 gear oil. For open drives, a lithium-based grease (NLGI Grade 2) applied to the tooth flanks is sufficient. Avoid running the gears dry.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Module 3【12 Tooth】 \/ Pilot Hole, Roughing \/ 1 pcs","offer_id":52442455834898,"sku":"PENGJGJXCD0927x1","price":18.35,"currency_code":"USD","in_stock":true},{"title":"Module 3【12 Tooth】 \/ 12mm + 4mm Keyway \/ 1 pcs","offer_id":52442455867666,"sku":"PENGDZ00054x1","price":19.71,"currency_code":"USD","in_stock":true},{"title":"Module 3【12 Tooth】 \/ 14mm + 5mm Keyway \/ 1 pcs","offer_id":52442455900434,"sku":"PENGDZ00055x1","price":19.71,"currency_code":"USD","in_stock":true},{"title":"Module 3【12 Tooth】 \/ 15mm + 5mm Keyway \/ 1 pcs","offer_id":52442455933202,"sku":"PENGDZ00056x1","price":19.71,"currency_code":"USD","in_stock":true},{"title":"Module 3【12 Tooth】 \/ 16mm + 5mm Keyway \/ 1 pcs","offer_id":52442455965970,"sku":"PENGDZ00057x1","price":14.89,"currency_code":"USD","in_stock":true},{"title":"Module 3【14 Tooth】 \/ Pilot Hole, Roughing \/ 1 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