{"product_id":"spur-gears-1-mod-transmission-gear-with-step-45-steel-pinion-motor-gear-90t-150t","title":"Spur Gears 1 Mod Transmission Gear With Step 45#Steel Pinion Motor Gear 90T~150T","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e1 Mod Steel Spur Gears with Step Bore — Reliable Pinion Motor Gears for Precision Drive Systems\u003c\/h2\u003e\n    \u003cp\u003eWhen your CNC router, robotic arm, or automation rig demands consistent torque transfer without slop or backlash, the wrong gear becomes the weakest link in your entire drivetrain. Engineers, makers, and machine builders who need repeatable, low-noise motion rely on properly specified 1 Mod steel spur gears with step bore to keep their builds running true.\u003c\/p\u003e\n    \u003cp\u003eThese 1 Mod spur gears are machined from 45# carbon steel, offering a solid balance of hardness and machinability. The stepped bore design accommodates standard shaft diameters ranging from 8 mm (0.31 in) to 30 mm (1.18 in), with keyway options (4×1.8 mm, 5×2.3 mm, and 6×2.8 mm, 8×3.3 mm) available across the range. Tooth counts span 90T through 150T with a 1M (Module 1) pitch, and step heights run from 30 mm to 70 mm depending on the variant selected.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include: replacing worn pinion gears on CNC plasma or router tables, building custom gearbox stages for stepper or servo motor drives, and constructing indexing or rotary-axis assemblies for 3D printer upgrades and robotic joint mechanisms.\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 (1M) gear systems. Mates with any standard 1M rack, pinion, or mating spur gear. Verify bore diameter and keyway dimensions against your shaft spec before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 1 Mod Steel Spur Gears\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 medium-carbon 45# steel for a reliable combination of surface hardness and core toughness — suitable for continuous-duty motor 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: 90T to 150T\u003c\/strong\u003e\n        \u003cp\u003eChoose from 90, 100, 120, 130, or 150 tooth configurations to dial in your gear ratio. More teeth mean smoother, quieter operation at higher speeds.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eStepped Bore with Keyway Options\u003c\/strong\u003e\n        \u003cp\u003eThe integrated step bore accepts shaft diameters from 8 mm to 30 mm. Keyway slots (4×1.8 mm, 5×2.3 mm, 6×2.8 mm, 8×3.3 mm) prevent rotational slip under load — critical for servo and stepper motor pinion applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n        \u003cstrong\u003eModule 1 (1M) Pitch Standard\u003c\/strong\u003e\n        \u003cp\u003eFully compatible with the international Module 1 gear standard. Pairs directly with 1M racks, worm gears, and mating spur gears without custom adaptation.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eMultiple Step Heights Available\u003c\/strong\u003e\n        \u003cp\u003eStep heights of 30 mm, 40 mm, 50 mm, 55 mm, and 70 mm are offered across variants, giving you flexibility to match motor shaft protrusion and housing clearance requirements.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\n        \u003cstrong\u003eDrop-In Replacement for CNC and Robotics Builds\u003c\/strong\u003e\n        \u003cp\u003eDimensionally consistent across the range, making these gears straightforward replacements or upgrades in existing 1M gear trains on CNC machines, robotic joints, and automated conveyor systems.\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 Gears\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1M (Module 1)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e90T \/ 100T \/ 120T \/ 130T \/ 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\u003e8 mm – 30 mm (0.31 in – 1.18 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003e4×1.8 mm \/ 5×2.3 mm \/ 6×2.8 mm \/ 8×3.3 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStep Height Range\u003c\/th\u003e\n\u003ctd\u003e30 mm – 70 mm (1.18 in – 2.76 in)\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\u003ePitch Diameter\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\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eExternal Spur Gear\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eCNC machines, robotics, automation, motor pinion drives\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 (90T, 100T, 120T, 130T, or 150T)?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eTooth count determines your gear ratio when paired with a pinion or mating gear. A higher tooth count on the driven gear produces more torque and lower output speed. For example, pairing a 90T gear with a 9T pinion gives a 10:1 reduction. Calculate your required ratio first, then select the tooth count that achieves it within your available space envelope.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat bore diameter and keyway size should I order?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the bore diameter to your motor or shaft OD. Then select the keyway that corresponds to your shaft's key slot: 4×1.8 mm is common on smaller shafts (8–12 mm), 5×2.3 mm on mid-range shafts (12–17 mm), 6×2.8 mm on 18–22 mm shafts, and 8×3.3 mm on 24–30 mm shafts. Refer to your shaft's engineering drawing or measure with calipers before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does the step bore design mean, and why does it matter?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA stepped bore means the gear hub has a counterbore — a larger-diameter recess on one face — that allows the gear to sit flush against a motor face or housing shoulder. This simplifies axial positioning and reduces the need for additional spacers. The step height dimension (30–70 mm) tells you how deep this recess is.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears strong enough for continuous-duty motor drive use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel offers a tensile strength typically in the 600–800 MPa range, making it well-suited for moderate-load continuous-duty applications such as CNC axis drives, conveyor pinions, and robotic joint actuators. For very high-shock or heavy-industrial loads, consider whether a hardened or alloy steel gear would be more appropriate for your specific torque and speed requirements.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these gears corrode if used in a damp or outdoor environment?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCarbon steel is susceptible to surface oxidation in humid or wet environments. For indoor CNC or robotics use, standard lubrication (grease or gear oil) provides adequate protection. For outdoor or high-humidity applications, consider applying a corrosion-inhibiting coating or selecting a stainless steel alternative if long-term exposure is expected.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these compatible with standard 1M racks and other Module 1 gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Module 1 is an internationally standardized pitch, so these gears will mesh correctly with any other Module 1 external spur gear, rack, or compatible component — regardless of brand — as long as the pressure angle is also 20°. Always confirm the mating gear's module and pressure angle before assembly.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I decide between a plain bore and a keyway bore variant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA plain bore (no keyway) relies on a set screw or interference fit to transmit torque — suitable for light loads or where the shaft has a flat. A keyway bore uses a physical key to positively lock the gear to the shaft, preventing rotational slip under higher torque or reversing loads. For motor pinion applications with significant torque, a keyway variant is strongly recommended.\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 Size (tooth count \/ bore diameter \/ step height) 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 (90T, 100T, 120T, 130T, or 150T)?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Tooth count determines your gear ratio when paired with a pinion or mating gear. A higher tooth count on the driven gear produces more torque and lower output speed. Calculate your required ratio first, then select the tooth count that achieves it within your available space envelope.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore diameter and keyway size should I order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the bore diameter to your motor or shaft OD. Select the keyway that corresponds to your shaft's key slot: 4x1.8mm for 8-12mm shafts, 5x2.3mm for 12-17mm, 6x2.8mm for 18-22mm, and 8x3.3mm for 24-30mm shafts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does the step bore design mean, and why does it matter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A stepped bore means the gear hub has a counterbore that allows the gear to sit flush against a motor face or housing shoulder, simplifying axial positioning and reducing the need for additional spacers.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears strong enough for continuous-duty motor drive use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel offers tensile strength typically in the 600-800 MPa range, making it well-suited for moderate-load continuous-duty applications such as CNC axis drives, conveyor pinions, and robotic joint actuators.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears corrode if used in a damp or outdoor environment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carbon steel is susceptible to surface oxidation in humid or wet environments. Standard lubrication provides adequate protection for indoor use. For outdoor or high-humidity applications, apply a corrosion-inhibiting coating.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these compatible with standard 1M racks and other Module 1 gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Module 1 is an internationally standardized pitch. These gears will mesh correctly with any other Module 1 external spur gear or rack with a 20° pressure angle.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I decide between a plain bore and a keyway bore variant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A plain bore relies on a set screw or interference fit for torque transmission. A keyway bore uses a physical key to positively lock the gear to the shaft, preventing rotational slip under higher torque or reversing loads — recommended for motor pinion applications.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1M 90T\/Bore 8mm\/Step 40mm","offer_id":52442705723666,"sku":"GLFBBYWGLBZSJ057658x","price":23.77,"currency_code":"USD","in_stock":true},{"title":"1M 90T\/Bore 10mm\/Step 40mm","offer_id":52442705756434,"sku":"GLFBBYWGLBZSJ057660x1","price":23.77,"currency_code":"USD","in_stock":true},{"title":"1M 90T\/Bore 10mm\/Step 30mm","offer_id":52442705789202,"sku":"GLFBBYWGLBZSJ057661x1","price":23.77,"currency_code":"USD","in_stock":true},{"title":"1M 90T\/Bore 12mm\/Step 40mm","offer_id":52442705821970,"sku":"GLFBBYWGLCDPJ03452x1","price":24.72,"currency_code":"USD","in_stock":true},{"title":"1M 90T\/Bore 12mm (4x1.8mm)\/ Step 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