{"product_id":"1-mod-45-steel-pinion-spur-gears-12-120-teeth-5-16mm-bore-with-screw-hard-tooth","title":"1 Mod 45# Steel Pinion Spur Gears 12-120 Teeth 5-16mm Bore With Screw Hard Tooth","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1 Mod 45# Steel Spur Gears — Precision Motion Control for Makers and Engineers\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router, robotic arm, or custom drive train demands reliable gear meshing without slop or premature wear, choosing the right spur gear matters. These 1 Mod 45# steel spur gears are engineered for hobbyists, workshop builders, and small-batch machine designers who need consistent tooth geometry and a secure shaft fit across a wide range of configurations.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel, delivering a good balance of hardness and machinability. The tooth profile follows the standard Module 1 (Mod 1) metric system, with pitch diameter ranging from approximately 12 mm (12T) to 120 mm (120T). Bore options span 5 mm to 16 mm (roughly 0.197\" to 0.630\"), and every gear ships with a set-screw (grub screw) for positive shaft retention.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DIY CNC axis drives where a 1 Mod gear pair provides smooth, low-backlash transmission; 3D printer extruder and Z-axis assemblies requiring a compact, hard-tooth pinion; and educational robotics platforms where students need an affordable, interchangeable metric gear set for torque-ratio experiments.\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 standard Module 1 (1 Mod) spur or pinion gear. Verify bore diameter matches your shaft size before ordering. Set-screw secures to plain or flat-sided shafts.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 1 Mod 45# Steel Spur Gears\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eWide Tooth Count Range (12T–120T)\u003c\/strong\u003e — Choose from 34 tooth-count options to dial in your exact gear ratio, from high-speed pinions to large reduction wheels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🕳️\u003c\/span\u003e\u003cstrong\u003eMultiple Bore Sizes (5–16 mm)\u003c\/strong\u003e — Ten bore diameter options (5, 6, 6.35, 7, 8, 10, 12, 14, 15, 16 mm) accommodate the most common metric and fractional motor shafts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eGrub Screw Included\u003c\/strong\u003e — Each gear comes with a set-screw for secure, tool-adjustable shaft retention without the need for keyways or press-fitting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eStandard Module 1 Tooth Profile\u003c\/strong\u003e — Fully interchangeable with any Mod 1 rack, pinion, or spur gear, making system expansion or replacement straightforward.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e — Offers a practical balance of surface hardness and toughness for moderate-load, continuous-duty applications in dry or lightly lubricated environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eHard Tooth Surface\u003c\/strong\u003e — Teeth are processed for increased surface hardness, reducing wear at the contact zone and extending service life under repetitive meshing loads.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 1 Mod Spur Gears\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1 (Mod 1)\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\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e12T, 15T, 16T, 18T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 33T, 35T, 36T, 38T, 40T, 42T, 44T, 45T, 48T, 50T, 52T, 54T, 55T, 56T, 60T, 64T, 66T, 70T, 72T, 80T, 100T, 120T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003e5 mm, 6 mm, 6.35 mm, 7 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\u003ePitch Diameter Range\u003c\/th\u003e\n\u003ctd\u003e12 mm (12T) – 120 mm (120T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Retention\u003c\/th\u003e\n\u003ctd\u003eGrub screw (set-screw) included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Surface\u003c\/th\u003e\n\u003ctd\u003eHard tooth (surface hardened)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur (parallel axis)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\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\u003eSee variant options\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\u003eThe gear ratio equals the driven gear's tooth count divided by the driving gear's tooth count. For example, pairing a 20T pinion with a 60T wheel gives a 3:1 reduction. Select a smaller tooth count (12T–25T) for high-speed, low-torque output, or a larger count (50T–120T) when you need torque multiplication and slower rotation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I order for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor or drive shaft diameter with calipers. Common metric sizes are 5, 6, 8, 10, and 12 mm; the 6.35 mm option suits ¼\" imperial shafts. The grub screw allows fine adjustment, but the bore must match the shaft diameter — do not attempt to force an undersized bore onto a shaft.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these gears mesh with my existing Module 1 rack or gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. All gears in this listing follow the standard Module 1 (1 Mod) metric tooth system with a 20° pressure angle, which is the most widely used metric gear standard. They will mesh correctly with any other Mod 1 spur gear, pinion, or rack regardless of brand, provided the tooth count and center distance are calculated correctly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these gears under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# steel provides a tensile strength of approximately 600–700 MPa in the normalized condition, with surface hardening further improving tooth contact durability. These gears are suitable for moderate-load, intermittent or continuous-duty applications such as CNC axis drives, extruder mechanisms, and light industrial automation. For heavy shock loads or very high RPM, consider a gear with a higher alloy steel grade.\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# carbon steel has limited inherent corrosion resistance. For indoor, dry, or lightly lubricated environments they perform well. If your application involves moisture, outdoor exposure, or chemical contact, apply a light machine oil or grease to the tooth surfaces, or consider stainless steel or nylon gear alternatives for corrosive environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need any special tools to install the gear onto a shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo special tools are required. Slide the gear onto the shaft, position it at the desired axial location, then tighten the included grub screw with a hex key (Allen wrench) of the appropriate size. For best results, ensure the shaft surface is clean and free of burrs. A flat on the shaft aligned with the grub screw will provide more positive retention under high torque.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears in a 3D printer or CNC router build?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, these are a popular choice for DIY CNC and 3D printer projects. The Mod 1 standard is widely used in open-source machine designs (e.g., extruder drives, Z-axis lead screw couplings, and belt-gear hybrids). Verify the bore matches your stepper motor shaft (typically 5 mm for NEMA 17 or 6.35 mm for some NEMA 23 motors) and confirm the tooth count matches your design's gear ratio requirement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003eNumber of Teeth\u003c\/strong\u003e and \u003cstrong\u003eBore Diameter\u003c\/strong\u003e above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"1 Mod \/ 12T \/ Bore 5mm","offer_id":52443350335762,"sku":"QTLJJGJXCD0140x1","price":2.76,"currency_code":"USD","in_stock":true},{"title":"1 Mod \/ 12T \/ Bore 6mm","offer_id":52443350368530,"sku":"QTLJJGJXCD0141x1","price":2.76,"currency_code":"USD","in_stock":true},{"title":"1 Mod \/ 15T \/ Bore 5mm","offer_id":52443350401298,"sku":"QTLJJGJXCD0142x1","price":2.98,"currency_code":"USD","in_stock":true},{"title":"1 Mod \/ 15T \/ Bore 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