{"product_id":"45-steel-helical-gear-1-mod-13-30-teeth-blackened-pinion-transmission-gears","title":"45# Steel Helical Gear 1 Mod 13-30 Teeth Blackened Pinion Transmission Gears","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e45# Steel Helical Gear 1 Mod — Precision Blackened Pinion for Smooth, Quiet Power Transmission\u003c\/h2\u003e\n    \u003cp\u003eWhen a noisy spur gear or a mismatched module causes vibration, lost motion, or premature wear in your drive train, the fix starts with the right helical gear. These 45# steel helical gears are engineered for makers, CNC builders, robotics integrators, and small-machine designers who need reliable, low-noise torque transfer without sourcing custom parts.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from 45# medium-carbon steel and finished with a blackening (black oxide) surface treatment that reduces friction and provides a baseline level of corrosion resistance. The module is 1 (Mod 1), with tooth counts ranging from 13 T to 30 T and bore diameters from 6 mm (0.24 in) to 16 mm (0.63 in). Outer diameters scale with tooth count — typically 15 mm (0.59 in) for 13 T up to approximately 32 mm (1.26 in) for 30 T.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include: CNC router Z-axis and rotary-axis drives requiring low backlash helical mesh; DC-motor gearbox stages in mobile robotics and AGV platforms; and compact industrial automation sub-assemblies where axial load capacity and quiet operation are priorities over a straight-cut spur gear.\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 Mod 1 standard — meshes with any Mod 1 mating helical gear of the same helix angle. Verify bore diameter and keyway requirements before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 45# Steel Helical Gears\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e — Offers a balanced combination of machinability and mechanical strength, suitable for moderate-to-high torque drive applications.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⬛\u003c\/span\u003e\n        \u003cstrong\u003eBlackened (Black Oxide) Finish\u003c\/strong\u003e — Reduces surface friction, minimizes light reflection in optical-sensitive environments, and provides a baseline corrosion barrier compared to bare steel.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eMod 1 Standard, 13–30 Tooth Range\u003c\/strong\u003e — Wide selection of tooth counts lets you dial in the exact gear ratio needed for your drive stage without custom machining.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eBore Sizes 6–16 mm\u003c\/strong\u003e — Multiple bore options (6, 8, 10, 12, 14, 15, 16 mm) accommodate common motor shaft diameters used in stepper, servo, and DC motor applications.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔇\u003c\/span\u003e\n        \u003cstrong\u003eHelical Tooth Profile for Quieter Operation\u003c\/strong\u003e — Gradual tooth engagement reduces impact noise and vibration compared to straight-cut spur gears, extending bearing and gear life in continuous-duty applications.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n        \u003cstrong\u003eFlexible Pack Quantities (1 \/ 2 \/ 4 \/ 10)\u003c\/strong\u003e — Order a single gear for prototyping or a pack of 10 for production runs, with per-unit cost savings at higher quantities.\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Helical Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\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 Treatment\u003c\/th\u003e\n\u003ctd\u003eBlackening (Black Oxide)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule (Mod)\u003c\/th\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e13 T \/ 15 T \/ 20 T \/ 26 T \/ 30 T\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6 mm \/ 8 mm \/ 10 mm \/ 12 mm \/ 14 mm \/ 15 mm \/ 16 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (approx.)\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\u003eHelix Angle\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eHelical Pinion Gear\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 4 \/ 10 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWeight (per piece)\u003c\/th\u003e\n\u003ctd\u003eSee 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\u003eTooth count determines your gear ratio when paired with a mating gear. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For example, pairing a 13 T pinion with a 26 T gear gives a 2:1 reduction. Smaller tooth counts (13–15 T) are common on motor shafts (driving pinions), while larger counts (20–30 T) are used on the driven side for speed reduction and torque multiplication.\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\u003eMatch the bore diameter to your motor shaft diameter. Common stepper motor shafts are 5 mm or 6.35 mm (1\/4 in); NEMA 23 steppers typically use 6.35 mm or 8 mm shafts; servo motors often use 8–14 mm shafts. If your shaft is slightly undersized, a set-screw hub or keyway can compensate — confirm the bore and hub depth before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears strong enough for my torque load?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel has a tensile strength of approximately 600–800 MPa depending on heat treatment. For Mod 1 gears, the allowable tangential load per unit face width is moderate — suitable for light-to-medium duty drives. For heavy shock loads or continuous high-torque applications, consider specifying face width and applying a service factor. Contact us with your torque and speed requirements if you need confirmation.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDoes the black oxide finish protect against rust?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBlack oxide provides a thin conversion coating that offers mild corrosion resistance — significantly less than zinc plating or stainless steel. For indoor, dry environments it is adequate. For humid, outdoor, or washdown environments, apply a light machine oil or grease to the gear teeth and bore after installation to extend service life.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these helical gears mesh with my existing Mod 1 spur gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eHelical gears and spur gears of the same module cannot be directly meshed — they require matching helix angles. These gears are designed to mesh with a mating Mod 1 helical gear of the same helix angle (and opposite hand for parallel-axis drives). If you need to interface with a spur gear, a transition stage or a different gear type is required.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between buying 1 pc vs. a pack of 10?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSingle-piece orders are ideal for prototyping, replacement, or low-volume builds. Packs of 2, 4, or 10 offer a lower per-unit cost and are suited for production runs, spare-parts inventory, or multi-axis machines that use the same gear specification on several axes. Select your pack size from the \"Pack of\" option above.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a keyway or set screw to secure the gear on the shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears are supplied with a plain bore. Securing method depends on your design: a set screw (grub screw) tapped into the hub is the most common approach for light-to-medium torque. For higher torque or reversing loads, a keyed shaft and matching keyway broached into the bore is recommended. Confirm hub dimensions and wall thickness before broaching.\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 \u0026amp; bore) and Pack of 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\": \"Tooth count determines your gear ratio when paired with a mating gear. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. Smaller tooth counts (13–15 T) are common on motor shafts (driving pinions), while larger counts (20–30 T) are used on the driven side for speed reduction and torque multiplication.\"\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\": \"Match the bore diameter to your motor shaft diameter. Common stepper motor shafts are 5 mm or 6.35 mm; NEMA 23 steppers typically use 6.35 mm or 8 mm shafts; servo motors often use 8–14 mm shafts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears strong enough for my torque load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel has a tensile strength of approximately 600–800 MPa. For Mod 1 gears, the allowable tangential load per unit face width is suitable for light-to-medium duty drives. Contact us with your torque and speed requirements for confirmation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the black oxide finish protect against rust?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Black oxide provides mild corrosion resistance — adequate for indoor, dry environments. For humid or outdoor environments, apply a light machine oil or grease to the gear teeth and bore after installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these helical gears mesh with my existing Mod 1 spur gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Helical gears and spur gears of the same module cannot be directly meshed — they require matching helix angles. These gears are designed to mesh with a mating Mod 1 helical gear of the same helix angle.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between buying 1 pc vs. a pack of 10?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Single-piece orders are ideal for prototyping or replacement. Packs of 2, 4, or 10 offer a lower per-unit cost and are suited for production runs or multi-axis machines using the same gear specification.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a keyway or set screw to secure the gear on the shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These gears are supplied with a plain bore. A set screw is the most common securing method for light-to-medium torque. For higher torque or reversing loads, a keyed shaft and matching keyway broached into the bore is recommended.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1Mod 13T Bore 6mm \/ 1","offer_id":52439966187794,"sku":"GLFBNHHJGJXCD1065x1","price":5.15,"currency_code":"USD","in_stock":true},{"title":"1Mod 13T Bore 8mm \/ 1","offer_id":52439966220562,"sku":"GLFBNHHJGJXCD1066x1","price":5.15,"currency_code":"USD","in_stock":true},{"title":"1Mod 15T Bore 6mm \/ 1","offer_id":52439966253330,"sku":"GLFBNHHJGJXCD1068x1","price":5.15,"currency_code":"USD","in_stock":true},{"title":"1Mod 15T Bore 8mm \/ 1","offer_id":52439966286098,"sku":"GLFBNHHJGJXCD1069x1","price":5.51,"currency_code":"USD","in_stock":true},{"title":"1Mod 15T Bore 10mm \/ 1","offer_id":52439966318866,"sku":"GLFBNHHJGJXCD1070x1","price":5.51,"currency_code":"USD","in_stock":true},{"title":"1Mod 15T Bore 12mm \/ 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