{"product_id":"0-5-mod-22-teeth-spur-gear-bore-4-5-6mm-motor-gears-45-steel","title":"0.5 Mod 22 Teeth Spur Gear Bore 4\/5\/6mm Motor Gears Transmission Gears 45# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e0.5 Mod 22-Tooth Spur Gear — Precision Steel Drive Gear for Small Motors \u0026amp; DIY Automation\u003c\/h2\u003e\n\u003cp\u003eWhen your small motor drive slips, strips, or simply lacks a reliable mating gear, finding a dimensionally accurate replacement in the right bore size becomes a real bottleneck. Whether you are a maker building a tabletop robot, an engineer prototyping a compact gearbox, or a hobbyist assembling a motorized mechanism, you need a spur gear that fits your shaft precisely and meshes cleanly with your existing drivetrain.\u003c\/p\u003e\n\u003cp\u003eThese 0.5 module 22-tooth spur gears are machined from 45# carbon steel, offering a solid balance of strength and machinability. The module 0.5 pitch gives a tooth pitch of approximately 1.571 mm (0.062 in), with an outer diameter of approximately 11.5 mm (0.453 in) and a face width typically in the 5–8 mm (0.197–0.315 in) range. Bore options of 4 mm, 5 mm, and 6 mm cover the most common small motor shaft diameters used in DIY and light industrial applications.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include small DC motor gearboxes for robotics and automation rigs, replacement transmission gears in 3D printer extruder drives, and compact gear trains in educational STEM kits or science fair projects requiring reliable 0.5 mod gear meshing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e Compatible with all standard \u003cstrong\u003eModule 0.5\u003c\/strong\u003e gear systems. Verify your shaft diameter before selecting bore size: \u003cstrong\u003e4 mm \/ 5 mm \/ 6 mm\u003c\/strong\u003e.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 0.5 Mod 22-Tooth 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# Carbon Steel Construction\u003c\/strong\u003e\u003cp\u003eMachined from 45# medium-carbon steel for reliable strength in light-to-medium load transmission applications without excessive weight.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eModule 0.5 Precision Tooth Profile\u003c\/strong\u003e\u003cp\u003eStandard 0.5 mod involute tooth geometry ensures smooth, low-noise meshing with any other Module 0.5 compatible gear in your drivetrain.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eThree Bore Sizes: 4 \/ 5 \/ 6 mm\u003c\/strong\u003e\u003cp\u003eSelect the bore that matches your motor shaft diameter exactly — no adapters or bushings required for standard small motor shafts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003e22-Tooth Count for Compact Ratios\u003c\/strong\u003e\u003cp\u003e22 teeth on a 0.5 mod gear delivers a compact outer diameter ideal for tight-clearance gearbox designs and miniature drive assemblies.\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\u003cp\u003eAvailable in packs of 1, 2, 3, 4, 5, 8, or 10 pieces — order exactly what your project requires, from single replacements to small production runs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eDrop-In Replacement Compatibility\u003c\/strong\u003e\u003cp\u003eDimensionally consistent with standard 0.5 mod gear specifications, making these a reliable drop-in replacement for worn or damaged gears in existing assemblies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 0.5 Mod Spur Gear\u003c\/h2\u003e\n\u003ctable\u003e\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\u003e22T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e4 mm \/ 5 mm \/ 6 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003eApprox. 11.5 mm (0.453 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Pitch\u003c\/th\u003e\n\u003ctd\u003eApprox. 1.571 mm (0.062 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\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# Carbon Steel\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\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur Gear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 4 \/ 5 \/ 8 \/ 10 pcs (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\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\u003csummary\u003eHow do I choose the right bore size for my motor shaft?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor shaft diameter with a caliper. This gear is available in 4 mm, 5 mm, and 6 mm bore sizes. Select the bore that matches your shaft diameter exactly for a secure fit. If your shaft is slightly undersized, a set screw or keyway can be used to lock the gear in place.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat does Module 0.5 mean and will it mesh with my existing gears?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eModule (Mod) is the standard metric measurement of gear tooth size. Module 0.5 gears will only mesh correctly with other Module 0.5 gears sharing the same pressure angle (20°). If your existing gear is marked 0.5M or M0.5, these gears are compatible. Do not attempt to mesh with Module 0.8, 1.0, or other module sizes.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow strong are these gears under load?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears are machined from 45# carbon steel, which provides good tensile strength suitable for light-to-medium duty transmission applications such as small robotics, motorized mechanisms, and educational equipment. For heavy industrial loads or continuous high-torque applications, consult a mechanical engineer to verify suitability.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre these gears corrosion resistant?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel has moderate corrosion resistance. For applications in humid or outdoor environments, we recommend applying a light machine oil or grease to the gear teeth and bore after installation. If corrosion resistance is a primary requirement, consider stainless steel or plastic gear alternatives.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan I use these gears in a 3D printer extruder or similar precision application?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The standard 0.5 mod involute tooth profile and consistent bore dimensions make these gears suitable for use in 3D printer extruder drives, small CNC mechanisms, and similar applications where dimensional accuracy and repeatable meshing are important. Verify the bore size matches your motor shaft before ordering.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhy should I order multiple pieces at once?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eOrdering in packs of 2, 3, 5, or more gives you spare gears on hand for future repairs or replacements without waiting for reshipment. Multi-pack options also reduce the per-unit cost, making them economical for small production runs, classroom kits, or projects requiring multiple gear stages.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat is the pressure angle of these spur gears?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears use the standard 20° pressure angle, which is the most common standard for metric module gears worldwide. This ensures compatibility with the vast majority of commercially available Module 0.5 mating gears and pinions.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e\u003cp\u003e🛒 Select your Size (bore diameter) and Packing Quantity above, then add to cart.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How do I choose the right bore size for my motor shaft?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Measure your motor shaft diameter with a caliper. This gear is available in 4 mm, 5 mm, and 6 mm bore sizes. 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