{"product_id":"mod-1-bevel-gear-c45-steel-1-2-ratio-15-18-20-30-36-40-tooth-90-hardened-black","title":"Mod 1 Bevel Gear C45 Steel 1:2 Ratio 15 18 20 30 36 40 Tooth 90° Hardened Black","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eMod 1 Bevel Gear C45 Steel — Compact 90° Right-Angle Drive for Precision Mechanical Builds\u003c\/h2\u003e\n\u003cp\u003eWhen a compact right-angle drive is the critical link in your build — whether you're routing power through a tight robotics joint, a miniature CNC axis, or a small automated mechanism — an imprecise or undersized gear introduces backlash and wear that compounds over every cycle. These Mod 1 bevel gears are designed for makers, engineers, and workshop builders who need a reliable, repeatable 90° power transfer in a smaller form factor than Module 1.5 or larger metric gears.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from C45 medium-carbon steel and finished with a hardened black oxide coating for corrosion resistance and reduced tooth-surface friction. The module is 1 (metric), with a fixed 1:2 gear ratio pairing (pinion to wheel). Tooth counts available: 15, 18, 20, 30, 36, and 40 teeth. Bore sizes range from 6 mm (0.24 in) to 12 mm (0.47 in), with a 4 mm keyway option on the 12 mm bore for positive shaft locking. Pitch diameter ranges from approximately 15 mm (0.59 in) for the 15T gear up to 40 mm (1.57 in) for the 40T gear.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include: compact right-angle gearbox assemblies in desktop CNC machines and 3D printer extruder drives, differential steering joints in small wheeled robots, and 90° torque redirection in automated camera pan-tilt rigs — all applications where a module 1 bevel gear set with a 1:2 ratio and hardened black finish delivers consistent mesh geometry in a space-constrained envelope.\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 Designed for Module 1 (metric) gear systems. Mates with corresponding Module 1 bevel pinion or wheel at 90° shaft angle. Verify bore diameter and keyway dimensions against your shaft spec before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Mod 1 Bevel Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eC45 Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from C45 medium-carbon steel, delivering a practical balance of toughness, machinability, and wear resistance for moderate-load mechanical drives in workshop and light industrial settings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⬛\u003c\/span\u003e \u003cstrong\u003eHardened Black Oxide Finish\u003c\/strong\u003e\n\u003cp\u003eThe hardened black surface treatment reduces bare-metal corrosion and lowers sliding friction at the tooth contact zone — extending service life in indoor workshop and light industrial environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eTrue 90° Mesh Angle\u003c\/strong\u003e\n\u003cp\u003eBevel geometry is precision-cut to a 90° shaft angle, enabling direct right-angle power transmission without additional brackets, couplings, or universal joints.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e \u003cstrong\u003e1:2 Fixed Gear Ratio\u003c\/strong\u003e\n\u003cp\u003eThe 1:2 ratio pairing (e.g., 15T pinion × 30T wheel, 20T × 40T) delivers a 2× speed reduction or 2× torque multiplication depending on which shaft is the driver.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e \u003cstrong\u003eKeyway Bore Option\u003c\/strong\u003e\n\u003cp\u003eThe 12 mm bore variant includes a precision-cut 4 mm keyway for positive shaft engagement — preventing rotational slip under reversing loads or vibration that set screws alone cannot reliably resist.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eFlexible Quantity Options\u003c\/strong\u003e\n\u003cp\u003eAvailable in 1, 2, 3, 4, 5, or 10-piece quantities per order — suited for single-unit prototyping, matched gear pair sourcing, or bulk stocking for production runs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Module 1 Bevel Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1 (metric)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Ratio\u003c\/th\u003e\n\u003ctd\u003e1:2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e15T, 18T, 20T, 30T, 36T, 40T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Angle\u003c\/th\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eC45 Medium-Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eHardened Black Oxide\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Option\u003c\/th\u003e\n\u003ctd\u003e4 mm keyway (12 mm bore only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter Range\u003c\/th\u003e\n\u003ctd\u003eApprox. 15 mm – 40 mm (0.59 in – 1.57 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\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\u003eWeight (per piece)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Quantities\u003c\/th\u003e\n\u003ctd\u003e1, 2, 3, 4, 5, 10 pcs\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 select the correct tooth count for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe 1:2 ratio is fixed, so you select a matched pair: 15T pinion with 30T wheel, 18T with 36T, or 20T with 40T. Choose the tooth count based on the pitch diameter that fits your housing envelope — the 15T gear has a pitch diameter of approximately 15 mm, while the 40T wheel reaches approximately 40 mm. Larger tooth counts generally handle higher torque loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size should I order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your shaft diameter precisely with a caliper. Select the bore that matches your shaft — for example, an 8 mm bore for an 8 mm shaft. For 12 mm shafts, consider the keyway bore variant for positive locking under reversing or shock loads. Confirm the keyway width (4 mm) matches your shaft key before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need the keyway bore, or will a plain bore work?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003ePlain bores (6–10 mm) are suitable for light-to-moderate unidirectional loads where a set screw provides adequate retention. The 12 mm keyway bore is recommended for applications with reversing loads, high torque, or vibration — the key prevents rotational slip that set screws alone cannot reliably resist over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow corrosion-resistant is the hardened black oxide finish?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBlack oxide provides mild corrosion resistance suitable for indoor workshop and light industrial environments. It is not equivalent to zinc plating or stainless steel for outdoor or high-humidity exposure. For demanding environments, apply a light machine oil or grease to the gear teeth and bore after installation to extend service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat load capacity can these Module 1 bevel gears handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eC45 steel bevel gears at Module 1 are designed for light-to-moderate mechanical drives — typical applications include desktop CNC axes, small robotics joints, and compact automation mechanisms. Exact torque ratings depend on operating speed, lubrication, and mounting rigidity. Contact us to confirm suitability for high-cycle or heavy-load applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears compatible with Module 1 bevel gears from other suppliers?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eModule 1 is a standardized metric gear module, so these gears will mesh with any correctly manufactured Module 1 bevel gear of the same pressure angle and 90° shaft angle. Verify the pressure angle (typically 20°) with your existing gear before mixing suppliers, as minor manufacturing tolerances can affect backlash and mesh quality.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I order just the pinion or just the wheel separately?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — each variant listing is for a single gear (pinion or wheel) at the specified tooth count. To build a complete 1:2 ratio drive, order both the pinion (e.g., 15T or 20T) and the corresponding wheel (30T or 40T) separately. The quantity option (1–10 pcs) refers to the number of identical gears per order, not a matched pair.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy choose Module 1 over Module 1.5 for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eModule 1 gears have a smaller tooth pitch and pitch diameter than Module 1.5, making them better suited for compact mechanisms where space is constrained — such as desktop robotics, small CNC machines, or miniature automation. Module 1.5 gears are larger and handle higher torque loads. Choose Module 1 when envelope size is the primary constraint; choose Module 1.5 when load capacity is the priority.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Models, Bore Size, and Amount above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"Module 1【15 Tooth】 \/ 6mm \/ 1 pcs","offer_id":52439338582290,"sku":"PENGJGJXCD2890x1","price":8.23,"currency_code":"USD","in_stock":true},{"title":"Module 1【30 Tooth】 \/ 8mm \/ 1 pcs","offer_id":52439338615058,"sku":"PENGJGJXCD2893x1","price":14.48,"currency_code":"USD","in_stock":true},{"title":"Module 1【30 Tooth】 \/ 10mm \/ 1 pcs","offer_id":52439338647826,"sku":"PENGJGJXCD2894x1","price":14.48,"currency_code":"USD","in_stock":true},{"title":"Module 1【18 Tooth】 \/ 6mm \/ 1 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