{"product_id":"module-5-spur-gear-pinion-45-steel-10t-38t","title":"Module 5.0 Spur Gear Pinion Gears 45# Steel 10T to 38T Metal Spur Transmission","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eModule 5 Spur Gear Pinion — Precision 45# Steel Drive Component for Demanding Applications\u003c\/h2\u003e\n\u003cp\u003eWhen your mechanical drive system demands consistent torque transfer and dimensional accuracy, a poorly matched gear becomes the weakest link. Engineers, robotics builders, and CNC machine designers who need a reliable module 5 spur gear pinion in a wide tooth-count range will find this 45# steel spur gear series purpose-built for the task. Available from 10 teeth to 38 teeth, this lineup covers the most common reduction ratios used in industrial and maker applications.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel — a material known for its balanced combination of tensile strength and machinability. The module (pitch) is 5.0, meaning the tooth pitch diameter equals 5 × tooth count in millimeters (e.g., a 20-tooth gear has a 100 mm pitch diameter \/ ~3.94 in). Bore diameter and keyway dimensions vary by tooth count; see variant options for exact bore specs. Face width is typically 20–30 mm (~0.79–1.18 in) depending on the selected variant.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include open-frame CNC router axis drives, robotic arm joint reduction stages, conveyor drive pinion replacements, and custom gearbox prototyping where a module 5 metal spur gear with a broad tooth-count selection is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e Compatible with all standard Module 5.0 spur gears, racks, and mating pinions following DIN 867 \/ ISO 54 tooth profile standards.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Module 5 Spur Gear Pinions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e — Offers solid mechanical strength and wear resistance suitable for continuous-duty drive applications without being brittle.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eModule 5.0 Standard Tooth Profile\u003c\/strong\u003e — Conforms to DIN 867 \/ ISO 54 involute tooth geometry, ensuring smooth meshing with any compatible module 5 rack or gear.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔢\u003c\/span\u003e\u003cstrong\u003eWide Tooth-Count Range: 10T to 38T\u003c\/strong\u003e — Select the exact pinion size you need for your target gear ratio without custom machining or compromise.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eMachined Bore \u0026amp; Keyway\u003c\/strong\u003e — Each gear features a precision-bored center hole sized for standard shaft diameters; keyway slot included for positive torque transmission. See variant options for bore dimensions.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eCorrosion-Resistant Surface Treatment\u003c\/strong\u003e — Blackened or lightly oiled finish helps protect against surface oxidation during storage and operation in low-humidity environments.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eDrop-In Replacement Geometry\u003c\/strong\u003e — Standard module 5 pitch makes these pinions interchangeable with existing module 5 gear trains, simplifying maintenance and upgrades.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Module 5 Spur Gear Pinion\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule (Pitch)\u003c\/th\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10T – 38T (select variant)\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\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eInvolute, DIN 867 \/ ISO 54\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\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003eModule × Teeth (e.g., 5 × 20T = 100 mm \/ 3.94 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFace Width\u003c\/th\u003e\n\u003ctd\u003eTypically 20–30 mm (0.79–1.18 in) — See variant options\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\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eIncluded — dimensions per variant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBlackened \/ lightly oiled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 PCS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I choose the right tooth count for my application?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe tooth count determines your gear ratio when paired with a mating gear. Divide the driven gear's tooth count by the pinion's tooth count to get the reduction ratio. For example, a 10-tooth pinion driving a 30-tooth gear gives a 3:1 reduction. Choose a lower tooth count for higher speed reduction and more torque multiplication, or a higher tooth count for a closer 1:1 ratio.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat shaft diameter does this gear fit?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count variant. Please refer to the variant options on this page or contact us to confirm the bore size for your selected tooth count before ordering. The keyway slot is included on all variants for positive shaft engagement.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs 45# steel strong enough for my drive system?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# medium-carbon steel provides a tensile strength of approximately 600–800 MPa depending on heat treatment, making it well-suited for moderate-to-heavy duty open gear drives, robotics joints, and CNC axis applications. For extremely high-shock or high-speed applications, consider whether a hardened or alloy steel variant would better suit your load requirements.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWill this gear rust or corrode?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe blackened and lightly oiled surface finish provides basic protection against surface oxidation during storage and in dry operating environments. For outdoor, high-humidity, or washdown environments, we recommend applying a compatible gear lubricant or grease regularly to maintain the tooth surface and prevent corrosion.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs this gear compatible with module 5 racks and other module 5 gears?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. All gears in this series follow the standard module 5.0 involute tooth profile (DIN 867 \/ ISO 54) with a 20° pressure angle. They will mesh correctly with any other module 5 spur gear, pinion, or rack that conforms to the same standard, regardless of brand or manufacturer.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan I use this gear in a gearbox or enclosed drive?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, module 5 spur gears are commonly used in both open-frame and enclosed gearbox configurations. Ensure adequate lubrication (grease or oil bath as appropriate) and that the housing provides sufficient clearance for the gear's outer diameter (tip diameter = module × (teeth + 2)). For enclosed drives, verify shaft center distance matches your gear pair's pitch diameter sum divided by 2.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do I calculate the center distance between two meshing module 5 gears?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCenter distance = (Pitch Diameter of Gear 1 + Pitch Diameter of Gear 2) \/ 2. Since pitch diameter = module × teeth, for a 10-tooth pinion and a 30-tooth gear: center distance = (5×10 + 5×30) \/ 2 = (50 + 150) \/ 2 = 100 mm. This is the theoretical center distance; allow for standard backlash in your design.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your tooth count (10T–38T) above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How do I choose the right tooth count for my application?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The tooth count determines your gear ratio when paired with a mating gear. Divide the driven gear's tooth count by the pinion's tooth count to get the reduction ratio. For example, a 10-tooth pinion driving a 30-tooth gear gives a 3:1 reduction. Choose a lower tooth count for higher speed reduction and more torque multiplication, or a higher tooth count for a closer 1:1 ratio.\"}},{\"@type\":\"Question\",\"name\":\"What shaft diameter does this gear fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Bore diameter varies by tooth count variant. Please refer to the variant options on this page or contact us to confirm the bore size for your selected tooth count before ordering.\"}},{\"@type\":\"Question\",\"name\":\"Is 45# steel strong enough for my drive system?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"45# medium-carbon steel provides a tensile strength of approximately 600–800 MPa depending on heat treatment, making it well-suited for moderate-to-heavy duty open gear drives, robotics joints, and CNC axis applications.\"}},{\"@type\":\"Question\",\"name\":\"Will this gear rust or corrode?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The blackened and lightly oiled surface finish provides basic protection against surface oxidation during storage and in dry operating environments. For outdoor or high-humidity environments, apply a compatible gear lubricant or grease regularly.\"}},{\"@type\":\"Question\",\"name\":\"Is this gear compatible with module 5 racks and other module 5 gears?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. All gears in this series follow the standard module 5.0 involute tooth profile (DIN 867 \/ ISO 54) with a 20° pressure angle. They will mesh correctly with any other module 5 spur gear, pinion, or rack conforming to the same standard.\"}},{\"@type\":\"Question\",\"name\":\"Can I use this gear in a gearbox or enclosed drive?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, module 5 spur gears are commonly used in both open-frame and enclosed gearbox configurations. Ensure adequate lubrication and that the housing provides sufficient clearance for the gear's outer diameter.\"}},{\"@type\":\"Question\",\"name\":\"How do I calculate the center distance between two meshing module 5 gears?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Center distance = (Pitch Diameter of Gear 1 + Pitch Diameter of Gear 2) \/ 2. Since pitch diameter = module × teeth, for a 10-tooth pinion and a 30-tooth gear: center distance = (50 + 150) \/ 2 = 100 mm.\"}}]}\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"45# Steel \/ 5 Modulus \/ 10 Teeth \u0026 1 PCS","offer_id":52443003388178,"sku":"GYJLTHXCDZH2835x1","price":141.43,"currency_code":"USD","in_stock":true},{"title":"45# Steel \/ 5 Modulus \/ 11 Teeth \u0026 1 PCS","offer_id":52443003420946,"sku":"GYJLTHXCDZH2836x1","price":153.67,"currency_code":"USD","in_stock":true},{"title":"45# Steel \/ 5 Modulus \/ 12 Teeth \u0026 1 PCS","offer_id":52443003453714,"sku":"GYJLTHXCDZH2837x1","price":165.5,"currency_code":"USD","in_stock":true},{"title":"45# Steel \/ 5 Modulus \/ 13 Teeth \u0026 1 PCS","offer_id":52443003486482,"sku":"GYJLTHXCDZH2838x1","price":176.92,"currency_code":"USD","in_stock":true},{"title":"45# Steel \/ 5 Modulus \/ 14 Teeth \u0026 1 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