{"product_id":"spur-gear-1-module-bore-6-8-10-12-15mm-teeth-31-120-pinion-45-steel-hard-tooth","title":"Spur Gear 1 Module Bore 6\/8\/10\/12\/15mm Teeth 31-120 Pinion 45 Steel Hard Tooth","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eModule 1 Spur Gear — Precision 45 Steel Pinion for Reliable Drive Systems\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or undersized gear throws off your entire build, the cost is not just the part — it is the downtime. Hobbyists, robotics engineers, and small-scale machine builders who need dimensionally consistent, hard-tooth pinion gears will find this module 1 spur gear a dependable foundation for any gear-driven mechanism.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45 carbon steel with a hardened tooth surface, available in tooth counts from 31T to 120T and bore diameters of 6 mm (0.24 in), 8 mm (0.31 in), 10 mm (0.39 in), 12 mm (0.47 in), 14 mm (0.55 in), and 15 mm (0.59 in). The module 1 pitch standard ensures direct interchangeability with any other module 1 component in your drivetrain.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include compact robotic arm joints requiring a module 1 spur gear with 6 mm bore, CNC router axis drives using a 40T-60T steel pinion gear, and DIY automation projects that need a hard-tooth module 1 gear set with matched bore-to-shaft fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Meshes with any Module 1 (1 mod) spur gear, rack, or pinion. Verify bore diameter matches your shaft before ordering.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Module 1 Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003e45 Carbon Steel Construction\u003c\/strong\u003e\u003cp\u003eMachined from 45 steel for a balance of toughness and machinability, suitable for moderate-to-high load drive applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🦷\u003c\/div\u003e\n\u003cstrong\u003eHard-Tooth Surface Treatment\u003c\/strong\u003e\u003cp\u003eTooth flanks are surface-hardened to resist wear and pitting, extending service life in continuous-duty or high-cycle mechanisms.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eModule 1 Standard — Wide Interchangeability\u003c\/strong\u003e\u003cp\u003eModule 1 pitch is one of the most common metric gear standards, making these pinions directly compatible with a broad range of off-the-shelf gears and racks.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003eWide Tooth Count Range (31T-120T)\u003c\/strong\u003e\u003cp\u003eEighteen tooth-count options let you dial in the exact gear ratio your application requires without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧\u003c\/div\u003e\n\u003cstrong\u003eMultiple Bore Sizes (6-15 mm)\u003c\/strong\u003e\u003cp\u003eSix bore options — 6, 8, 10, 12, 14, and 15 mm — cover the most common shaft diameters used in hobby motors, stepper motors, and servo shafts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003cstrong\u003eSold Individually (1 pc per order)\u003c\/strong\u003e\u003cp\u003eEach variant ships as a single gear, so you can mix tooth counts and bores to build exactly the gear train you need without paying for extras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — Module 1 Spur Gear\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Standard (Module)\u003c\/th\u003e\n\u003ctd\u003eModule 1 (m1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45 Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eHard Tooth (surface-hardened)\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 Options\u003c\/th\u003e\n\u003ctd\u003e31T, 32T, 34T, 35T, 36T, 37T, 38T, 39T, 40T, 42T, 45T, 50T, 55T, 60T, 70T, 80T, 100T, 120T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003e6 mm \/ 8 mm \/ 10 mm \/ 12 mm \/ 14 mm \/ 15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutside 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\u003eHub 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\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural steel \/ lightly oiled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\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\u003eGear ratio = driven teeth divided by driving teeth. Pairing a 31T pinion with a 62T gear gives a 2:1 reduction. The module 1 standard means any two module 1 gears will mesh correctly regardless of tooth count.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhich bore size should I order for my motor shaft?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your shaft diameter with calipers before ordering. Common stepper motor shafts are 5 mm or 8 mm; hobby DC motors often use 3-6 mm shafts. Contact us to confirm if you are unsure.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat does hard tooth mean and why does it matter?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eHard-tooth gears have their tooth flanks surface-hardened after machining, creating a wear-resistant outer layer while keeping the core tough. This resists pitting and surface fatigue under repeated load cycles.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs 45 steel strong enough for my load?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45 carbon steel has a tensile strength of approximately 600-800 MPa in normalized condition, suitable for moderate-to-high load gear applications including robotics, CNC, and general automation at hobby-to-light-industrial torque levels.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWill these gears rust or corrode?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45 carbon steel is not inherently corrosion-resistant. The gears are finished with a light oil coating. For humid or wet environments, apply a gear lubricant or grease during installation and re-apply periodically.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan I use these gears with a rack and pinion system?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any module 1 spur gear from this listing will mesh correctly with a module 1 rack at 20 degree pressure angle. Suitable for CNC machines, camera sliders, and linear motion builds.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do I calculate the center distance between two meshing gears?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCenter distance = (Teeth A + Teeth B) x Module divided by 2. For a 40T and 60T module 1 pair: (40 + 60) x 1 \/ 2 = 50 mm center distance.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Gears (tooth count) and Bore diameter 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\":\"Gear ratio = driven teeth divided by driving teeth. Pairing a 31T pinion with a 62T gear gives a 2:1 reduction. Module 1 gears mesh with any other module 1 gear.\"}},{\"@type\":\"Question\",\"name\":\"Which bore size should I order for my motor shaft?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Measure your shaft diameter with calipers. Common stepper motor shafts are 5-8 mm; hobby DC motors use 3-6 mm shafts.\"}},{\"@type\":\"Question\",\"name\":\"What does hard tooth mean?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Tooth flanks are surface-hardened after machining for wear resistance and fatigue resistance under repeated load cycles.\"}},{\"@type\":\"Question\",\"name\":\"Is 45 steel strong enough?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"45 carbon steel has tensile strength of 600-800 MPa, suitable for robotics, CNC, and automation at hobby-to-light-industrial torque levels.\"}},{\"@type\":\"Question\",\"name\":\"Will these gears rust?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"45 steel is not corrosion-resistant. Apply gear lubricant during installation and re-apply periodically in humid environments.\"}},{\"@type\":\"Question\",\"name\":\"Can I use these with a rack and pinion system?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, module 1 gears mesh with module 1 racks at 20 degree pressure angle. Suitable for CNC, camera sliders, and linear motion.\"}},{\"@type\":\"Question\",\"name\":\"How do I calculate center distance?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Center distance = (Teeth A + Teeth B) x Module \/ 2. For 40T and 60T module 1: (40+60) x 1 \/ 2 = 50 mm.\"}}]}\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"31T \/ 6mm \/ 1","offer_id":52442003112210,"sku":"PHGLFBLTYHXCDZH0289x1","price":15.15,"currency_code":"USD","in_stock":true},{"title":"31T \/ 8mm \/ 1","offer_id":52442003144978,"sku":"PHGLFBLTYHXCDZH0290x1","price":15.15,"currency_code":"USD","in_stock":true},{"title":"31T \/ 10mm \/ 1","offer_id":52442003177746,"sku":"PHGLFBLTYHXCDZH0291x1","price":16.56,"currency_code":"USD","in_stock":true},{"title":"31T \/ 12mm \/ 1","offer_id":52442003210514,"sku":"PHGLFBLTYHXCDZH0292x1","price":16.56,"currency_code":"USD","in_stock":true},{"title":"32T \/ 8mm \/ 1","offer_id":52442003243282,"sku":"PHGLFBLTYHXCDZH0293x1","price":16.21,"currency_code":"USD","in_stock":true},{"title":"32T \/ 10mm \/ 1","offer_id":52442003276050,"sku":"PHGLFBLTYHXCDZH0294x1","price":17.63,"currency_code":"USD","in_stock":true},{"title":"32T \/ 12mm \/ 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