{"product_id":"spur-gear-1-mod-transmission-gear-with-step-45-steel-pinion-motor-gear-25-30-35t","title":"Spur Gear 1 Mod Transmission Gear With Step 45#Steel Pinion Motor Gear 25\/30\/35T","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1 Mod Spur Gear with Step Bore — Precision 45# Steel Pinion for Reliable Power Transmission\u003c\/h2\u003e\n\u003cp\u003eWhen your DIY drive system, CNC build, or robotics project demands a gear that fits a stepped shaft without slipping, finding the right bore-to-step combination can be a real headache. Makers, hobbyists, and small-shop engineers who work with 1 module pitch systems need a spur gear that drops straight onto a stepped shaft and locks in place — no custom machining required.\u003c\/p\u003e\n\u003cp\u003eThese 1 Mod spur gears are machined from 45# medium-carbon steel, offering a solid balance of hardness and toughness for power-transmission applications. Each gear features a precision-cut stepped bore that accommodates a range of shaft diameters (5 mm – 17 mm \/ 0.20\" – 0.67\") with step diameters of 20 mm or 25 mm. Tooth counts available are 25T, 30T, and 35T, with an outer diameter that scales accordingly (typically 27 mm – 37 mm \/ 1.06\" – 1.46\").\u003c\/p\u003e\n\u003cp\u003eTypical use cases include 1 mod spur gear for CNC router axis drives, DIY gearbox pinion replacement with stepped shaft, and small motor output gear for robotics and automation rigs. The stepped bore design eliminates the need for a separate shaft collar, making assembly faster on benchtop projects and compact drive trains.\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 1 Module (Mod 1) gear systems. Pairs with any Mod 1 rack, pinion, or mating spur gear. Bore options: 5 \/ 6 \/ 6.35 \/ 7 \/ 8 \/ 10 \/ 12 \/ 12.7 \/ 14 \/ 15 \/ 16 \/ 17 mm. Step diameters: 20 mm or 25 mm. Verify shaft diameter and step dimension before ordering.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 1 Mod 45# Steel Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from 45# steel for a dependable combination of surface hardness and core toughness, resisting wear under sustained rotational loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eStepped Bore Design\u003c\/strong\u003e\n\u003cp\u003eIntegrated step bore (20 mm or 25 mm step) seats directly on a stepped shaft, eliminating the need for a separate retaining collar and simplifying assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003e1 Module Pitch — Universal Compatibility\u003c\/strong\u003e\n\u003cp\u003eStandard Mod 1 tooth profile meshes cleanly with any Mod 1 rack, pinion, or mating gear, making it easy to integrate into existing drive systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eThree Tooth Count Options\u003c\/strong\u003e\n\u003cp\u003eAvailable in 25T, 30T, and 35T to let you dial in the gear ratio your project needs — from faster output speeds to higher torque multiplication.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e \u003cstrong\u003eWide Bore Range\u003c\/strong\u003e\n\u003cp\u003eTwelve bore diameter options from 5 mm to 17 mm cover the most common motor and shaft sizes used in CNC, robotics, and DIY automation builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eOrder 1, 3, 5, or 10 pieces per variant to match your project scale — single prototypes or small production runs, without overstocking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — 1 Mod Spur Gear with Step Bore\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\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\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e25T \/ 30T \/ 35T\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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Medium-Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e5 \/ 6 \/ 6.35 \/ 7 \/ 8 \/ 10 \/ 12 \/ 12.7 \/ 14 \/ 15 \/ 16 \/ 17 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStep Diameter\u003c\/th\u003e\n\u003ctd\u003e20 mm or 25 mm (see variant options)\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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eMachined, natural steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 3 \/ 5 \/ 10 Pcs (see 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 — 25T, 30T, or 35T?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYour tooth count determines the gear ratio when paired with a mating gear. A lower tooth count (25T) on the drive gear produces a higher speed reduction when meshed with a larger gear, while a higher tooth count (35T) reduces the ratio difference. Calculate your desired output speed or torque and select accordingly. If you are replacing an existing gear, match the tooth count exactly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore diameter should I select 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. Select the bore option that matches your shaft size exactly — available from 5 mm up to 17 mm. Common motor shaft sizes include 5 mm, 6 mm, 6.35 mm (1\/4\"), 8 mm, and 10 mm. If your shaft is between listed sizes, contact us to confirm the closest fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the step diameter, and why does it matter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe step diameter refers to the larger shoulder machined into the bore that seats against a stepped shaft or housing face. Options are 20 mm and 25 mm. Choose the step diameter that matches the shoulder on your shaft or the counterbore in your housing to ensure the gear seats flush and does not wobble under load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs 45# steel strong enough for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# medium-carbon steel offers a tensile strength typically in the range of 600–800 MPa after standard heat treatment, making it suitable for moderate-load power transmission in CNC machines, robotics, and DIY gearboxes. For very high-torque or high-speed industrial applications, consider whether a hardened or alloy steel gear would be more appropriate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these gears rust or corrode?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# steel is not inherently corrosion-resistant. For indoor or dry environments, the natural machined surface is adequate. If your application involves moisture, coolant, or outdoor exposure, apply a light machine oil coating or consider a zinc-plated or stainless alternative. Regular lubrication also extends service life significantly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with Mod 1 racks and other Mod 1 gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These gears follow the standard Mod 1 tooth profile with a 20° pressure angle, so they mesh correctly with any other Mod 1 spur gear, rack, or pinion of the same module. Do not mix with Mod 0.8, Mod 1.25, or other module sizes — mismatched modules will not mesh properly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I order a single piece to test fit before buying in bulk?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Each variant is available in a 1-piece quantity, so you can order a single gear to verify fit and function before committing to a 3, 5, or 10-piece pack. Simply select your tooth count, bore diameter, step diameter, and \"1 Pcs\" from the quantity option.\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, bore diameter, and pack quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"25T \/ 5mm \/ 20mm \u0026 1 Pcs","offer_id":52443324514578,"sku":"GLFBBYWHK-KCSJ2728x1","price":6.84,"currency_code":"USD","in_stock":true},{"title":"25T \/ 5mm \/ 20mm \u0026 3 Pcs","offer_id":52443324547346,"sku":"GLFBBYWHK-KCSJ2728x3","price":17.86,"currency_code":"USD","in_stock":true},{"title":"25T \/ 5mm \/ 20mm \u0026 5 Pcs","offer_id":52443324580114,"sku":"GLFBBYWHK-KCSJ2728x5","price":28.87,"currency_code":"USD","in_stock":true},{"title":"25T \/ 5mm \/ 20mm \u0026 10 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