{"product_id":"45-steel-helical-gear-2-mod-15-teeth-blackened-pinion-transmission-gears","title":"45# Steel Helical Gear 2 Mod 15 Teeth Blackened Pinion Transmission Gears","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e45# Steel Helical Gear 2 Mod 15 Teeth — Reliable Blackened Pinion for Smooth Power Transmission\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or noisy gear derails your build, the root cause is almost always a mismatch between gear geometry and shaft fit. Machinists, robotics engineers, and DIY drive-train builders who need a compact 15-tooth helical pinion with a precise bore-and-keyway fit will find this 45# steel helical gear engineered to eliminate that frustration from the start.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel and finished with a blackening treatment for corrosion resistance and a clean, professional appearance. The module 2 (2 Mod) tooth profile delivers smooth, low-noise meshing. Bore diameters range from 12 mm (0.47 in) to 22 mm (0.87 in) with matching keyways from 4 mm to 6 mm, covering the most common shaft sizes used in light-to-medium power transmission applications.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC router axis drives, robotic arm joint transmissions, conveyor reduction stages, and custom gearbox builds where a helical pinion gear with keyway bore is required for positive torque transfer without set-screw slip.\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 to mesh with Module 2 spur or helical gears of matching helix angle. Verify bore diameter and keyway dimensions against your shaft before ordering. Pack of 1 or Pack of 2 available.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 45# Steel Helical Pinion Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from 45# steel for a balance of toughness, machinability, and wear resistance suited to moderate-load transmission applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚫\u003c\/span\u003e\n\u003cstrong\u003eBlackened Surface Finish\u003c\/strong\u003e\n\u003cp\u003eOxide blackening provides a uniform dark finish that resists surface rust and reduces light reflection in precision assemblies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eModule 2 Helical Tooth Profile\u003c\/strong\u003e\n\u003cp\u003e15-tooth, 2 Mod helical profile ensures smooth, quiet meshing and gradual load engagement compared to equivalent spur gears.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n\u003cstrong\u003eMultiple Bore \u0026amp; Keyway Options\u003c\/strong\u003e\n\u003cp\u003eNine bore-and-keyway combinations (Bore 12–22 mm \/ Keyway 4–6 mm) let you match the gear directly to your shaft without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n\u003cstrong\u003eSingle or Twin-Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eAvailable in Pack of 1 for single-axis builds or Pack of 2 for paired-drive or spare-on-hand configurations, priced accordingly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n\u003cstrong\u003eDrop-In Replacement Geometry\u003c\/strong\u003e\n\u003cp\u003eStandard Mod 2 tooth form is interchangeable with other Mod 2 helical pinions, making this a reliable drop-in replacement for worn drive gears in existing assemblies.\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 — Helical Pinion Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e2 (Mod 2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e15T\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\u003eBlackened (Oxide Treatment)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e12 \/ 14 \/ 15 \/ 16 \/ 17 \/ 18 \/ 19 \/ 20 \/ 22 mm — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Width\u003c\/th\u003e\n\u003ctd\u003e4 mm (Bore 12 mm) \/ 5 mm (Bore 14–17 mm) \/ 6 mm (Bore 18–22 mm) — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Circle Diameter\u003c\/th\u003e\n\u003ctd\u003e30 mm (0.47 in) — calculated: Module × Teeth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eHelical Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 or 2 — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHelix Angle\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFace Width\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\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\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right bore diameter for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your shaft diameter with a caliper. Select the bore option that matches your shaft exactly — for example, a 16 mm shaft requires the \"Bore 16 Keyway 5mm\" variant. The keyway must also align with the key stock on your shaft. If your shaft is between listed sizes, contact us to confirm the closest fit.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat load capacity can this helical gear handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel offers a tensile strength of approximately 600–800 MPa depending on heat treatment. For light-to-medium duty applications such as CNC axis drives, robotic joints, and small conveyor stages, this gear is well suited. For heavy industrial loads or continuous high-torque applications, please contact us to confirm suitability.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this gear corrosion resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe blackened oxide finish provides basic surface corrosion resistance suitable for indoor and dry environments. For outdoor, wet, or chemically exposed applications, additional lubrication or a protective coating is recommended. The finish is not equivalent to stainless steel or hot-dip galvanizing.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh with my existing Module 2 spur gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis is a helical gear. It will mesh correctly with other Module 2 helical gears of the same helix angle and direction. Meshing a helical gear with a standard spur gear of the same module is generally not recommended for load-bearing applications as it produces axial thrust and uneven contact. Contact us to confirm compatibility with your specific mating gear.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between Pack of 1 and Pack of 2?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePack of 1 contains a single gear — ideal when you need one pinion for a single drive axis. Pack of 2 contains two identical gears at a reduced per-unit cost, useful for paired-drive configurations, dual-axis builds, or keeping a spare on hand for maintenance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this gear without a keyway (press fit or set screw)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAll variants include a machined keyway. While you can technically use the bore without a key (relying on friction or a set screw in the keyway slot), this is not recommended for torque-transmitting applications as it risks shaft damage and gear slip. For best results, use a matching key stock to fill the keyway.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I verify the helix angle before ordering?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe helix angle determines the direction and degree of tooth engagement. Please contact us with your mating gear specifications and we will confirm whether this pinion is compatible with your assembly before you order.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Specification (bore \u0026amp; keyway) 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 bore diameter for my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your shaft diameter with a caliper. Select the bore option that matches your shaft exactly. The keyway must also align with the key stock on your shaft. If your shaft is between listed sizes, contact us to confirm the closest fit.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What load capacity can this helical gear handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel offers a tensile strength of approximately 600–800 MPa. Suitable for light-to-medium duty applications such as CNC axis drives, robotic joints, and small conveyor stages.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this gear corrosion resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The blackened oxide finish provides basic surface corrosion resistance for indoor and dry environments. Additional lubrication or coating is recommended for outdoor or wet applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing Module 2 spur gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This is a helical gear and meshes correctly with other Module 2 helical gears of the same helix angle and direction. Meshing with a spur gear of the same module is not recommended for load-bearing use.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between Pack of 1 and Pack of 2?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Pack of 1 contains a single gear. Pack of 2 contains two identical gears at a reduced per-unit cost, useful for paired-drive configurations or keeping a spare on hand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear without a keyway?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"All variants include a machined keyway. Using the bore without a key is not recommended for torque-transmitting applications as it risks shaft damage and gear slip.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I verify the helix angle before ordering?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Contact us with your mating gear specifications and we will confirm whether this pinion is compatible with your assembly before you order.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2Mod 15T Bore 12 Keyway 4mm \/ 1","offer_id":52439885447442,"sku":"GLFBNHHJGJXCD1121x1","price":33.85,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 14 Keyway 5mm \/ 1","offer_id":52439885480210,"sku":"GLFBNHHJGJXCD1122x1","price":33.85,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 15 Keyway 5mm \/ 1","offer_id":52439885512978,"sku":"GLFBNHHJGJXCD1123x1","price":33.85,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 16 Keyway 5mm \/ 1","offer_id":52439885545746,"sku":"GLFBNHHJGJXCD1124x1","price":33.85,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 17 Keyway 5mm \/ 1","offer_id":52439885578514,"sku":"GLFBNHHJGJXCD1125x1","price":33.85,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 18 Keyway 6mm \/ 1","offer_id":52439885611282,"sku":"GLFBNHHJGJXCD1126x1","price":33.85,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 19 Keyway 6mm \/ 1","offer_id":52439885644050,"sku":"GLFBNHHJGJXCD1127x1","price":33.85,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 20 Keyway 6mm \/ 1","offer_id":52439885676818,"sku":"GLFBNHHJGJXCD1128x1","price":33.85,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 22 Keyway 6mm \/ 1","offer_id":52439885709586,"sku":"GLFBNHHJGJXCD1129x1","price":33.85,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 12 Keyway 4mm \/ 2","offer_id":52439885742354,"sku":"GLFBNHHJGJXCD1121x2","price":65.62,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 14 Keyway 5mm \/ 2","offer_id":52439885775122,"sku":"GLFBNHHJGJXCD1122x2","price":65.62,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 15 Keyway 5mm \/ 2","offer_id":52439885807890,"sku":"GLFBNHHJGJXCD1123x2","price":65.62,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 16 Keyway 5mm \/ 2","offer_id":52439885840658,"sku":"GLFBNHHJGJXCD1124x2","price":65.62,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 17 Keyway 5mm \/ 2","offer_id":52439885873426,"sku":"GLFBNHHJGJXCD1125x2","price":65.62,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 18 Keyway 6mm \/ 2","offer_id":52439885906194,"sku":"GLFBNHHJGJXCD1126x2","price":65.62,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 19 Keyway 6mm \/ 2","offer_id":52439885938962,"sku":"GLFBNHHJGJXCD1127x2","price":65.62,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 20 Keyway 6mm \/ 2","offer_id":52439885971730,"sku":"GLFBNHHJGJXCD1128x2","price":65.62,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T Bore 22 Keyway 6mm \/ 2","offer_id":52439886004498,"sku":"GLFBNHHJGJXCD1129x2","price":65.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-03_84e49040-22be-46f8-a7dd-37970ddf1e48.jpg?v=1783434019","url":"https:\/\/homediyer.com\/products\/45-steel-helical-gear-2-mod-15-teeth-blackened-pinion-transmission-gears","provider":"HomeDIYer","version":"1.0","type":"link"}