{"product_id":"3-mod-spiral-bevel-gear-15-40t-90-degree-45-steel-pairing","title":"3 mod Twill Spiral Bevel Gear  15-40 Zähne 90° Meshing 45# Steel 1:1 Pairing","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3 Mod Spiral Bevel Gear Pairs — Precision 90° Power Transmission in 45# Steel\u003c\/h2\u003e\n\u003cp\u003eWhen your drivetrain demands a clean 90° direction change without sacrificing torque or smoothness, standard spur gears simply fall short. Engineers, robotics builders, and CNC hobbyists working on compact drive systems need a bevel gear set they can trust to mesh accurately and run quietly under load. These 3 mod spiral bevel gear pairs are designed for exactly that — delivering reliable right-angle power transmission in a compact, machined package.\u003c\/p\u003e\n\u003cp\u003eEach set consists of a matched 1:1 ratio bevel gear pair machined from 45# medium-carbon steel, heat-treated for surface hardness and wear resistance. The spiral (twill) tooth profile spans a tooth count range of 15T through 40T, with outer diameters from approximately 48.7 mm (1.92 in) up to 123.7 mm (4.87 in). Module (mod) is 3, and the meshing angle is a precise 90°. Both gears in each pair are cut as a matched set to ensure consistent backlash and tooth contact.\u003c\/p\u003e\n\u003cp\u003eTypical applications include right-angle gearbox assemblies for DIY CNC routers, custom robotic joint drives requiring a 90° bevel gear transmission, small-scale industrial automation rigs, and maker projects where a compact spiral bevel gear set replaces bulky worm gear arrangements. The spiral tooth form also makes these a strong candidate for low-noise 3 mod bevel gear replacements in existing machinery.\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 Module 3 (Mod 3) gear systems only. Meshing angle: 90°. Ratio: 1:1 matched pairs. Verify your shaft bore requirements against variant dimensions before ordering — bore size is not pre-machined and may require finishing.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 3 Mod Spiral Bevel Gears\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e — Machined from 45# steel for a balance of machinability, surface hardness after heat treatment, and tensile strength suited to moderate-to-high torque bevel drive applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌀\u003c\/span\u003e\u003cstrong\u003eSpiral (Twill) Tooth Profile\u003c\/strong\u003e — The helical tooth geometry distributes load across multiple teeth simultaneously, reducing noise and vibration compared to straight-cut bevel gears — ideal for continuous-duty or higher-speed drives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003ePrecise 90° Meshing Angle\u003c\/strong\u003e — Each matched pair is manufactured to a 90° shaft angle, enabling clean right-angle power transmission without shimming or angular adjustment in standard housings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cstrong\u003e1:1 Matched Gear Pairs\u003c\/strong\u003e — Both driver and driven gears share the same tooth count, delivering a 1:1 speed and torque ratio — consistent and predictable for direct-drive right-angle applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eWide Size Range: 15T to 40T\u003c\/strong\u003e — Twenty tooth-count options from 15T (D48.7 mm \/ 1.92 in) to 40T (D123.7 mm \/ 4.87 in) let you match the gear to your available envelope and torque requirements without custom machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eAvailable in Single or Pair Quantities\u003c\/strong\u003e — Order 1 pc for a replacement gear or 2 pcs for a complete matched set, with quantity pricing reflected at checkout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 3 Mod Spiral Bevel Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule (Mod)\u003c\/th\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e15T – 40T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003e48.7 mm – 123.7 mm (1.92 in – 4.87 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMeshing Angle\u003c\/th\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Ratio\u003c\/th\u003e\n\u003ctd\u003e1:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eSpiral (Twill \/ Helical Bevel)\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 Treatment\u003c\/th\u003e\n\u003ctd\u003eSee 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\u003eHub Length\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\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 pc or 2 pcs (matched pair)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\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\n\u003csummary\u003eHow do I choose the right tooth count for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSince all variants are 1:1 ratio pairs, the tooth count primarily determines the outer diameter and the physical size of the gear set. Choose a larger tooth count (e.g., 30T–40T) when you need a larger gear envelope or higher torque capacity, and a smaller count (e.g., 15T–20T) for compact installations. Confirm the outer diameter fits your housing before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these sold as a matched pair or as individual gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYou can choose either option. Selecting \"1 pcs\" gives you a single gear (driver or driven — both are identical in a 1:1 set). Selecting \"2 pcs\" gives you a complete matched bevel gear pair ready to install as a right-angle drive set.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the bore diameter, and can I have it custom-machined?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe bore diameter varies by tooth count and is not pre-machined to a specific shaft size in most variants — it typically requires finish boring or reaming to your shaft diameter. Please contact us to confirm the as-supplied bore condition for your selected size before ordering if a specific bore is critical.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these gears, and what torque can they handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese gears are machined from 45# medium-carbon steel, which offers good tensile strength and responds well to heat treatment for surface hardness. Exact torque ratings depend on tooth count, operating speed, lubrication, and housing support. For precise load calculations, apply standard AGMA or ISO bevel gear rating methods using the module and face width of your selected variant.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# steel is not inherently corrosion-resistant. For applications in humid or wet environments, we recommend applying a suitable gear lubricant or grease, and considering a protective coating after installation. If corrosion resistance is a primary requirement, contact us to discuss alternative material options.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these mesh with other Mod 3 bevel gears I already have?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese gears are manufactured to Module 3 (Mod 3) standards with a 90° meshing angle. They are designed to mesh with other Mod 3 spiral bevel gears of the same tooth count at 90°. They will not mesh correctly with different module sizes (e.g., Mod 2 or Mod 4) or with straight-cut bevel gears of a different tooth profile geometry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy choose a spiral bevel gear over a straight bevel gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSpiral (twill) bevel gears engage teeth gradually along the helical tooth line, spreading load across multiple teeth at once. This results in quieter operation, smoother torque transfer, and longer service life under continuous or higher-speed duty compared to straight-cut bevel gears, which engage the full tooth face simultaneously and can generate more noise and impact loading.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your tooth count (Size) and quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"3M 15T (D48.7mm) \/ 1pcs","offer_id":52439293526290,"sku":"YULESHXJZC1817x1","price":22.44,"currency_code":"USD","in_stock":true},{"title":"3M 16T (D51.7mm) \/ 1pcs","offer_id":52439293559058,"sku":"YULESHXJZC1818x1","price":26.79,"currency_code":"USD","in_stock":true},{"title":"3M 17T (D54.7mm) \/ 1pcs","offer_id":52439293591826,"sku":"YULESHXJZC1819x1","price":36.86,"currency_code":"USD","in_stock":true},{"title":"3M 18T (D57.7mm) \/ 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