{"product_id":"1-mod-spur-gear-45-steel-pinion-gear-with-step","title":"High Precision 1 Mod 10T-150T Spur Gear 45# Steel Pinion Gear With Step x 1Pcs","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e1 Mod Spur Gear with Step — 45# Steel Pinion Gear for Precision Drive Systems\u003c\/h2\u003e\n    \u003cp\u003eWhen your build demands exact gear meshing and zero slop, a mismatched or undersized spur gear can derail an entire project. Whether you're a robotics engineer, RC vehicle builder, CNC hobbyist, or mechanical DIYer, finding a 1 module spur gear with the right tooth count and bore diameter in a single order is often the biggest bottleneck. This listing solves that problem with a wide selection of 45# steel pinion gears with step, covering tooth counts from 10T to 150T and bore sizes from 4mm to 20mm.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from 45# carbon steel — a medium-carbon steel known for its balance of hardness, toughness, and machinability. The step design integrates a reduced-diameter hub section, allowing secure shaft seating and set-screw locking without additional spacers. Gear outer diameters range from approximately 12mm (10T) to 152mm (150T), with step diameters spanning 0mm to 50mm depending on the variant. Bore sizes available: 4mm, 5mm, 6mm, 6.35mm, 7mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm, 16mm, 17mm, 19mm, and 20mm.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include custom gearbox assemblies for wheeled robots and RC crawlers, lead-screw drive stages in DIY CNC routers and 3D printer extruder systems, and torque-transfer mechanisms in automated conveyor or actuator builds — all applications where a 1 mod steel spur gear with step bore delivers reliable, repeatable engagement.\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 Designed for Module 1 (1 Mod) gear systems. Meshes with any other 1 Mod spur, rack, or pinion gear. Verify bore diameter and step diameter match your shaft and housing before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 1 Mod Spur Gears with Step\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-list\"\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e\n        \u003cp\u003eMachined from 45# medium-carbon steel for a reliable balance of surface hardness and core toughness — suitable for moderate-to-high load drive applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eWide Tooth Count Range: 10T to 150T\u003c\/strong\u003e\n        \u003cp\u003eCovers an extensive gear ratio range in a single product family, from compact 10-tooth pinions to large 150-tooth driven gears — ideal for custom ratio tuning.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eMultiple Bore Sizes Available\u003c\/strong\u003e\n        \u003cp\u003eBore options from 4mm to 20mm (including 6.35mm \/ 1\/4\" and 12.7mm \/ 1\/2\" imperial sizes) accommodate a broad range of motor and shaft standards.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n        \u003cstrong\u003eIntegrated Step Hub Design\u003c\/strong\u003e\n        \u003cp\u003eThe stepped hub section provides a positive axial stop for shaft positioning and a flat for set-screw engagement, reducing assembly complexity and improving concentricity.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n        \u003cstrong\u003eModule 1 Standard — Universal Mesh Compatibility\u003c\/strong\u003e\n        \u003cp\u003eConforms to the international Module 1 gear standard, ensuring direct mesh compatibility with any other 1 Mod rack, pinion, or spur gear regardless of brand.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n        \u003cstrong\u003eSold Individually (x1 Piece per Order)\u003c\/strong\u003e\n        \u003cp\u003eEach variant is sold as a single gear, letting you order exactly the tooth count and bore combination you need without paying for extras you don't.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — 1 Mod Spur Gear with Step\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\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10T – 150T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e4mm – 20mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStep Diameter Range\u003c\/th\u003e\n\u003ctd\u003e0mm – 50mm (see 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\u003eOuter Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e(Tooth Count + 2) × 1mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural steel \/ lightly oiled\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatibility\u003c\/th\u003e\n\u003ctd\u003eModule 1 gear systems\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\u003eThe tooth count determines your gear ratio. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For example, a 10T pinion driving a 50T gear gives a 5:1 reduction. Select tooth counts based on the torque and speed requirements of your build. Smaller pinions (10T–20T) are common on motor shafts; larger gears (50T–150T) are used as driven wheels or idlers.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat bore size should I order for my motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or drive shaft diameter precisely with calipers. Common motor shaft sizes include 4mm, 5mm, 6mm, 6.35mm (1\/4\"), 8mm, and 10mm. The bore must match your shaft diameter exactly — a loose bore will cause runout and slipping. If your shaft is imperial (e.g., 1\/4\" or 1\/2\"), select the 6.35mm or 12.7mm bore options respectively.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the step diameter, and do I need it?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe step is a reduced-diameter hub section machined into the gear body. It acts as a shoulder stop for axial positioning on the shaft and provides a flat surface for a set screw. If your design requires a flush or recessed gear mount, or if you need a positive axial stop without a separate collar, choose a variant with a step diameter. If your mounting arrangement doesn't require a step, the 0mm step variants are plain-hub gears.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these gears under load?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears are machined from 45# carbon steel, which has a tensile strength of approximately 600–700 MPa in its normalized state. They are suitable for moderate-to-high torque applications in robotics, RC vehicles, and light industrial automation. For very high-shock or continuous heavy-load applications, consider whether a hardened or alloy steel gear would be more appropriate for your specific duty cycle.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears corrosion resistant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel is not inherently corrosion resistant. The gears are supplied with a light oil coating to prevent surface rust during storage and transit. For outdoor or humid environments, apply a suitable gear lubricant or grease during installation, and consider periodic re-lubrication. For corrosive environments, stainless steel or plastic gears may be more appropriate.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear mesh with gears from other brands?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These gears conform to the international Module 1 standard with a 20° pressure angle, which is the most widely used metric gear standard globally. They will mesh correctly with any other Module 1 spur gear, rack, or pinion — regardless of brand — as long as the module and pressure angle match. Do not attempt to mesh Module 1 gears with Module 0.8, Module 1.25, or other module sizes.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I calculate the center distance between two meshing gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor two Module 1 spur gears, the center distance (in mm) is simply: (Tooth Count of Gear 1 + Tooth Count of Gear 2) ÷ 2. For example, a 20T and a 40T gear would require a center distance of (20 + 40) ÷ 2 = 30mm. This formula applies to standard (non-profile-shifted) Module 1 gears with a 20° pressure angle.\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 tooth count, bore size, and step diameter 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\": \"The tooth count determines your gear ratio. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For example, a 10T pinion driving a 50T gear gives a 5:1 reduction. Select tooth counts based on the torque and speed requirements of your build.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore size should I order for my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or drive shaft diameter precisely with calipers. Common motor shaft sizes include 4mm, 5mm, 6mm, 6.35mm (1\/4\\\"), 8mm, and 10mm. The bore must match your shaft diameter exactly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the step diameter, and do I need it?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The step is a reduced-diameter hub section machined into the gear body. It acts as a shoulder stop for axial positioning on the shaft and provides a flat surface for a set screw. If your mounting arrangement doesn't require a step, the 0mm step variants are plain-hub gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these gears under load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These gears are machined from 45# carbon steel, which has a tensile strength of approximately 600–700 MPa in its normalized state. They are suitable for moderate-to-high torque applications in robotics, RC vehicles, and light industrial automation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel is not inherently corrosion resistant. The gears are supplied with a light oil coating to prevent surface rust during storage and transit. Apply a suitable gear lubricant or grease during installation for humid or outdoor environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with gears from other brands?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These gears conform to the international Module 1 standard with a 20° pressure angle. They will mesh correctly with any other Module 1 spur gear, rack, or pinion regardless of brand, as long as the module and pressure angle match.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I calculate the center distance between two meshing gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For two Module 1 spur gears, the center distance (in mm) is: (Tooth Count of Gear 1 + Tooth Count of Gear 2) ÷ 2. For example, a 20T and a 40T gear require a center distance of 30mm.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1 Mod 10T \/ 4mm \/ 0mm","offer_id":52442295763218,"sku":"GF0265A-0","price":8.81,"currency_code":"USD","in_stock":true},{"title":"1 Mod 10T \/ 5mm \/ 0mm","offer_id":52442295795986,"sku":"GF0265A-1","price":8.13,"currency_code":"USD","in_stock":true},{"title":"1Mod 12T \/ 4mm \/ 0mm","offer_id":52442295828754,"sku":"GF0265A-2","price":13.99,"currency_code":"USD","in_stock":true},{"title":"1Mod 12T \/ 5mm \/ 0mm","offer_id":52442295861522,"sku":"GF0265A-3","price":8.13,"currency_code":"USD","in_stock":true},{"title":"1Mod 12T \/ 6mm \/ 0mm","offer_id":52442295894290,"sku":"GF0265A-4","price":8.13,"currency_code":"USD","in_stock":true},{"title":"1Mod 12T \/ 6.35mm \/ 0mm","offer_id":52442295927058,"sku":"GF0265A-5","price":9.48,"currency_code":"USD","in_stock":true},{"title":"1Mod 12T \/ 7mm \/ 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