{"product_id":"0-5-mod-50-teeth-spur-gear-stepper-motor-45-steel","title":"0.5 Mod 50 Teeth Transmission Gears Spur Gear With Step Motor Gears 45# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e0.5 Module 50-Tooth Spur Gear — Precision Steel Drive for Stepper \u0026amp; Servo Motors\u003c\/h2\u003e\n    \u003cp\u003eWhen your CNC router, 3D printer, or robotic arm demands repeatable, low-backlash motion, a poorly fitted gear becomes the weakest link in the entire drivetrain. This 0.5 Mod 50 Teeth Transmission Spur Gear is engineered for makers, automation engineers, and small-workshop builders who need a reliable, drop-in drive component without custom machining.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from 45# medium-carbon steel, offering a balanced combination of hardness and toughness suited to moderate-load transmission applications. The module is 0.5 with 50 teeth, giving an outer diameter of approximately 26 mm (≈1.02 in). Bore options range from 6 mm to 14 mm (plain bore) and include step-bore configurations (e.g., 8\/3×1.4 mm, 10\/3×1.4 mm, 10\/4×1.8 mm, 12\/4×1.8 mm) designed to seat directly on standard stepper motor shafts with a flat or keyway.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include: pairing with NEMA 17 or NEMA 23 stepper motors in CNC gantry systems for precise rack-and-pinion or gear-train positioning; building compact gear-reduction stages in robotic joints and actuator assemblies; and replacing worn drive gears in small automated conveyor or indexing fixtures where a 0.5-module pitch is already established.\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 0.5-module gear systems. Mates with any 0.5 Mod rack, pinion, or mating gear. Bore sizes suit NEMA 17 (5 mm shaft — use 6 mm bore with set screw), NEMA 23 (6.35 mm shaft), and common stepper\/servo shaft diameters up to 14 mm. Step-bore variants fit shafts with a D-flat or keyway slot.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 0.5 Mod 50-Tooth 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# Steel Construction\u003c\/strong\u003e\n        \u003cp\u003eMedium-carbon steel provides the hardness needed for consistent tooth engagement under cyclic loads, while remaining machinable for secondary bore modifications if required.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003e0.5 Module, 50 Teeth\u003c\/strong\u003e\n        \u003cp\u003eStandard 0.5 Mod pitch ensures direct interchangeability with any 0.5-module rack or mating gear. 50 teeth yield an OD of ~26 mm (≈1.02 in), keeping the assembly compact.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eMultiple Bore Options\u003c\/strong\u003e\n        \u003cp\u003eChoose from plain bores (6, 6.35, 8, 10, 12, 14 mm) or step-bore configurations sized for common stepper motor shaft diameters — no adapter sleeve needed in most builds.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n        \u003cstrong\u003eStep-Bore Variants for Motor Shafts\u003c\/strong\u003e\n        \u003cp\u003eStep-bore options (8\/3×1.4 mm, 10\/3×1.4 mm, 10\/4×1.8 mm, 12\/4×1.8 mm) are machined to accept a D-flat or keyway, providing positive torque transfer without slipping under load.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n        \u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\n        \u003cp\u003eAvailable in packs of 1, 2, 3, 4, 5, 8, or 10 pieces — order exactly what your project needs, or stock up for multi-axis builds and spare-parts inventory.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eBroad Application Compatibility\u003c\/strong\u003e\n        \u003cp\u003eSuited for CNC routers, 3D printer extruder drives, robotic arm joints, indexing tables, and any DIY automation project running a 0.5-module gear train.\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 — 0.5 Mod Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e~26 mm (~1.02 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003e25 mm (0.98 in)\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\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6 \/ 6.35 \/ 8 \/ 10 \/ 12 \/ 14 mm (plain); 8\/3×1.4, 10\/3×1.4, 10\/4×1.8, 12\/4×1.8 mm (step bore)\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\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20°\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur Gear (straight tooth)\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        \u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 4 \/ 5 \/ 8 \/ 10 pcs (select above)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Module\u003c\/th\u003e\n\u003ctd\u003e0.5 Mod 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 bore size for my stepper motor?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the bore to your motor shaft diameter. NEMA 17 motors typically use a 5 mm shaft — select the 6 mm bore and secure with a set screw or locking collar. NEMA 23 motors commonly use a 6.35 mm (1\/4 in) shaft, so choose the 6.35 mm bore option. For motors with a D-flat or keyway, select the corresponding step-bore variant (e.g., 8\/3×1.4 mm means an 8 mm shaft with a 3 mm wide × 1.4 mm deep keyway slot).\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does the step-bore specification (e.g., 8\/3×1.4mm) mean?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe step-bore notation describes a two-diameter bore: the first number is the main shaft diameter (e.g., 8 mm), and the second pair (3×1.4 mm) is the width × depth of the keyway or D-flat relief machined into the bore wall. This allows the gear to lock onto a keyed or D-shaft without rotating under torque.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs 45# steel strong enough for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# medium-carbon steel (roughly equivalent to AISI 1045) offers a tensile strength of approximately 600–800 MPa in its normalized state, making it well-suited for moderate-load, low-to-medium speed gear drives such as CNC positioning axes, robotic joints, and small conveyor drives. For very high-speed or heavy-shock-load applications, consider whether a hardened or alloy steel gear would be more appropriate.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear rust or corrode?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCarbon steel is susceptible to surface oxidation in humid environments. For indoor, dry-environment use (typical of CNC machines and 3D printers), the bare steel surface is generally acceptable with light lubrication. If your application involves moisture exposure, apply a thin coat of machine oil or grease to the tooth faces and bore, or consider a corrosion-resistant coating after installation.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat mating gear or rack should I use with this 0.5 Mod 50T gear?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAny gear or rack with a 0.5 module and a 20° pressure angle will mesh correctly with this gear. The center distance between two meshing 0.5 Mod gears equals (T1 + T2) × 0.5 \/ 2, where T1 and T2 are the tooth counts. For example, pairing this 50T gear with a 20T pinion gives a center distance of (50 + 20) × 0.5 \/ 2 = 17.5 mm.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow many pieces should I order for a multi-axis CNC build?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA standard 3-axis CNC router or gantry system typically requires one drive gear per axis, so a 3-piece pack covers a full machine. Many builders order an extra piece as a spare. For a 4- or 5-axis machine, the 5-piece or 8-piece pack offers the best per-unit value. Check the packing quantity selector above to compare pricing across pack sizes.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I modify the bore size myself after purchase?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 45# steel is machinable on a lathe or with a drill press and reamer. You can bore out a smaller bore to a larger diameter, or add a keyway with a broach. However, do not reduce the bore below the listed size, and ensure the remaining wall thickness is sufficient for your torque requirements. If you are unsure, select the closest bore size to your shaft and consult a machinist.\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 and Packing Quantity 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 bore size for my stepper motor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the bore to your motor shaft diameter. NEMA 17 motors typically use a 5 mm shaft — select the 6 mm bore and secure with a set screw or locking collar. NEMA 23 motors commonly use a 6.35 mm (1\/4 in) shaft, so choose the 6.35 mm bore option. For motors with a D-flat or keyway, select the corresponding step-bore variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does the step-bore specification (e.g., 8\/3×1.4mm) mean?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The step-bore notation describes a two-diameter bore: the first number is the main shaft diameter (e.g., 8 mm), and the second pair (3×1.4 mm) is the width × depth of the keyway or D-flat relief machined into the bore wall.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is 45# steel strong enough for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# medium-carbon steel offers a tensile strength of approximately 600–800 MPa in its normalized state, making it well-suited for moderate-load, low-to-medium speed gear drives such as CNC positioning axes, robotic joints, and small conveyor drives.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear rust or corrode?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carbon steel is susceptible to surface oxidation in humid environments. For indoor, dry-environment use, the bare steel surface is generally acceptable with light lubrication. Apply a thin coat of machine oil or grease if moisture exposure is expected.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What mating gear or rack should I use with this 0.5 Mod 50T gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Any gear or rack with a 0.5 module and a 20° pressure angle will mesh correctly. The center distance between two meshing 0.5 Mod gears equals (T1 + T2) × 0.5 \/ 2.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces should I order for a multi-axis CNC build?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A standard 3-axis CNC router typically requires one drive gear per axis, so a 3-piece pack covers a full machine. For a 4- or 5-axis machine, the 5-piece or 8-piece pack offers the best per-unit value.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I modify the bore size myself after purchase?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. 45# steel is machinable on a lathe or with a drill press and reamer. You can bore out a smaller bore to a larger diameter, or add a keyway with a broach. Ensure the remaining wall thickness is sufficient for your torque requirements.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"0.5M 50T, Bore 6mm \/ 1 pcs","offer_id":52443142422802,"sku":"GLFBFHHGLCDPJ00090x1","price":13.59,"currency_code":"USD","in_stock":true},{"title":"0.5M 50T, Bore 6.35mm \/ 1 pcs","offer_id":52443142455570,"sku":"GLFBFHHGLCDPJ03276x1","price":13.59,"currency_code":"USD","in_stock":true},{"title":"0.5M 50T, Bore 8mm \/ 1 pcs","offer_id":52443142488338,"sku":"GLFBFHHGLCDPJ00091x1","price":13.59,"currency_code":"USD","in_stock":true},{"title":"0.5M 50T, Bore 10mm \/ 1 pcs","offer_id":52443142521106,"sku":"GLFBFHHGLCDPJ00092x1","price":13.59,"currency_code":"USD","in_stock":true},{"title":"0.5M 50T, Bore 12mm \/ 1 pcs","offer_id":52443142553874,"sku":"GLFBFHHGLCDPJ00093x1","price":13.59,"currency_code":"USD","in_stock":true},{"title":"0.5M 50T, Bore 14mm \/ 1 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