{"product_id":"1-5mod-45-steel-spur-gear-30-teeth-bore-6-22mm-pinion-gear-with-step-motor-gear","title":"1.5Mod 45# Steel Spur Gear 30 Teeth Bore 6-22mm Pinion Gear With Step Motor Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1.5 Mod 30-Tooth Steel Spur Gear — Reliable Power Transmission for Precision Builds\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router stalls, your robot arm skips steps, or your automation rig loses torque, the culprit is often a gear that can't hold tight tolerances under load. This 1.5 Mod 30-tooth spur gear is engineered for makers, robotics builders, and mechanical engineers who need consistent, repeatable motion transfer without backlash creep.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel, delivering a solid balance of hardness and machinability. The tooth profile follows the standard 1.5 module (Mod 1.5) specification with 30 teeth, an outer diameter of approximately 48 mm (≈1.89 in), and a face width (teeth thickness) of 12 mm or 15 mm depending on variant. Bore options range from 5 mm to 22 mm (≈0.20–0.87 in), with step-bore and keyway configurations available across variants.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include NEMA 17\/23 stepper motor pinion drives in desktop CNC machines, gear-reduction stages in robotic arms and linear actuators, and replacement drive gears in 3D printer extruder assemblies or conveyor indexing systems.\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 Meshes with any standard Mod 1.5 spur or helical gear. Bore sizes suit NEMA 17 (5 mm shaft), NEMA 23 (6.35 mm \/ 8 mm shaft), and custom step-bore configurations. Confirm your shaft diameter and keyway spec before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 1.5 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# Medium-Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from 45# carbon steel for a tensile strength typically in the 600–800 MPa range, resisting deformation under sustained radial and tangential loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eStandard Mod 1.5 Tooth Profile\u003c\/strong\u003e\n\u003cp\u003e30-tooth involute profile with module 1.5 ensures smooth meshing and interchangeability with any other Mod 1.5 gear in your drivetrain.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n\u003cstrong\u003eWide Bore Range — 5 mm to 22 mm\u003c\/strong\u003e\n\u003cp\u003eStep-bore and straight-bore variants cover shafts from 5 mm to 22 mm (≈0.20–0.87 in), with keyway slots on select sizes for positive torque locking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n\u003cstrong\u003eCNC-Hobbed Teeth for Low Backlash\u003c\/strong\u003e\n\u003cp\u003eTeeth are hobbed on CNC gear-cutting machines to DIN\/ISO tolerance grades, minimising positional error in closed-loop motion control applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n\u003cstrong\u003eTwo Face-Width Options: 12 mm \u0026amp; 15 mm\u003c\/strong\u003e\n\u003cp\u003eChoose 12 mm (≈0.47 in) for compact assemblies or 15 mm (≈0.59 in) for higher load capacity — both share the same pitch circle for direct substitution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n\u003cstrong\u003eDrop-In Pinion for Stepper \u0026amp; Servo Motors\u003c\/strong\u003e\n\u003cp\u003eDesigned as a direct pinion gear for NEMA-frame stepper and servo motors, enabling quick drivetrain prototyping without custom machining.\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 — Mod 1.5 Spur Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule (Mod)\u003c\/th\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e30\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 (OD)\u003c\/th\u003e\n\u003ctd\u003eApprox. 48 mm (≈1.89 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Circle Diameter\u003c\/th\u003e\n\u003ctd\u003e45 mm (≈1.77 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFace Width (Teeth Thickness)\u003c\/th\u003e\n\u003ctd\u003e12 mm or 15 mm — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e5 mm – 22 mm — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway \/ Step Bore\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural \/ Lightly Oiled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Standard\u003c\/th\u003e\n\u003ctd\u003eDIN \/ ISO Mod 1.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplicable Shaft\u003c\/th\u003e\n\u003ctd\u003e5 mm – 22 mm (NEMA 17, NEMA 23 compatible)\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\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right bore size for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor shaft diameter with a caliper. NEMA 17 motors typically use a 5 mm shaft; NEMA 23 motors commonly use 6.35 mm (1\/4 in) or 8 mm shafts. Select the bore that matches your shaft, and check whether you need a step-bore (for set-screw retention) or a keyway bore (for positive torque locking). If your shaft falls between standard sizes, choose the next size up and use a shaft collar or Loctite retaining compound.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does \"Step Bore\" mean in the variant name?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA step bore means the bore has two diameters: a larger outer section and a smaller inner section. This allows the gear to seat against a shoulder on the shaft, providing axial location without a separate spacer. The step depth (25 mm or 35 mm) listed in the variant name indicates the length of the smaller-diameter section.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh with my existing Mod 1.5 gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any two gears with the same module (Mod 1.5) and the same pressure angle (20°) will mesh correctly regardless of tooth count. The centre distance between the two gears equals (T1 + T2) × Module \/ 2, where T1 and T2 are the tooth counts. For a 30-tooth gear meshing with another 30-tooth gear, the centre distance is 45 mm.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is 45# steel — can it handle my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel (equivalent to AISI 1045) has a typical tensile strength of 600–800 MPa in the normalised condition. It is well-suited for moderate-load power transmission in robotics, CNC, and automation. For very high-shock or high-speed applications, consider whether a hardened or alloy-steel gear would be more appropriate. Contact us if you need load calculations for your specific use case.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this gear corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel is not inherently corrosion-resistant. For indoor, dry environments (typical for CNC machines and robotics), a light coat of machine oil is sufficient for long-term protection. For humid or outdoor environments, apply a rust-inhibiting grease or consider a zinc-plated or stainless-steel alternative. The gears are shipped with a light protective oil coating.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 12 mm and 15 mm face-width variants?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFace width (teeth thickness) directly affects load capacity. The 15 mm variant can transmit approximately 25% more torque than the 12 mm variant at the same speed, because more tooth surface area is in contact. If your build has tight axial space constraints, choose 12 mm. If you need maximum torque capacity or are running at higher RPM, choose 15 mm. Both variants share the same pitch circle diameter and will mesh identically with mating gears.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this as a replacement gear in my 3D printer or extruder?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, provided your printer's drivetrain uses a Mod 1.5 gear standard and the bore matches your motor shaft. Many desktop FDM printers use Mod 1 or Mod 0.5 gears — verify your existing gear's module before ordering. You can measure module by dividing the outer diameter (in mm) by (tooth count + 2): OD ÷ (T + 2) = Module.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Modulus and Teeth Thick – Bore size 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 motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor shaft diameter with a caliper. NEMA 17 motors typically use a 5 mm shaft; NEMA 23 motors commonly use 6.35 mm or 8 mm shafts. Select the bore that matches your shaft, and check whether you need a step-bore or a keyway bore.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does Step Bore mean in the variant name?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A step bore has two diameters: a larger outer section and a smaller inner section, allowing the gear to seat against a shaft shoulder for axial location. The step depth (25 mm or 35 mm) indicates the length of the smaller-diameter section.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing Mod 1.5 gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any two gears with the same module (Mod 1.5) and pressure angle (20°) will mesh correctly. Centre distance = (T1 + T2) x Module \/ 2.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is 45# steel?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel (AISI 1045 equivalent) has a typical tensile strength of 600–800 MPa, suitable for moderate-load power transmission in robotics, CNC, and automation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this gear corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel is not inherently corrosion-resistant. Apply machine oil for dry indoor use, or rust-inhibiting grease for humid environments. Gears are shipped with a light protective oil coating.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 12 mm and 15 mm face-width variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 15 mm face-width variant transmits approximately 25% more torque than the 12 mm variant due to greater tooth contact area. Both share the same pitch circle diameter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this as a replacement gear in my 3D printer or extruder?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, if your printer uses Mod 1.5 gears and the bore matches your motor shaft. Verify your existing gear's module: OD ÷ (tooth count + 2) = Module.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1.5 Mod, 30T \/ 12mm - 10mm (Step 25mm)","offer_id":52442406256914,"sku":"QTLJGLBZSJ057895x1","price":25.27,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 30T \/ 12mm - 10mm (Step 35mm)","offer_id":52442406289682,"sku":"QTLJGLBZSJ057896x1","price":25.27,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 30T \/ 12mm - 12mm","offer_id":52442406322450,"sku":"QTLJGLBZSJ057897x1","price":25.54,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 30T \/ 12mm - 17mm","offer_id":52442406355218,"sku":"QTLJGLBZSJ057898x1","price":25.54,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 30T \/ 12mm - 20mm","offer_id":52442406387986,"sku":"QTLJGLBZSJ057899x1","price":25.27,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 30T \/ 12mm - 8mm","offer_id":52442406420754,"sku":"QTLJGLBZSJ057900x1","price":25.98,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 30T \/ 12mm - 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