{"product_id":"3m-timing-belt-pulley-20t-100t-step-keyway-bore-8-25mm-10mm-belt","title":"3M 20T-100T Timing Belt Pulley With Step\/Keyway, Bore 8-25mm,For 10mm Width Belt","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3M Timing Belt Pulley — Precise Tooth Engagement for 10mm Width Belts\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or mismatched pulley causes positioning errors in your CNC router, 3D printer, or linear actuator, the entire project stalls. Engineers and makers who need repeatable, backlash-free motion rely on a pulley that holds its tooth profile under load — and that is exactly what these 3M timing belt pulleys are designed to deliver.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy with a hard-anodized finish, featuring a 3M tooth pitch (3mm center-to-center). Tooth counts range from 20T to 100T, bore diameters from 8mm (0.31 in) to 25mm (0.98 in), and keyway widths from 3mm to 8mm depending on the variant. A machined step and keyway slot ensure positive shaft locking when used with a set screw or key.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include open-loop stepper-driven CNC gantries requiring consistent belt tension, desktop 3D printer X\/Y axis drives where tooth skip causes layer shifts, and compact conveyor or pick-and-place automation where a low-profile 10mm-wide belt drive saves space compared to chain or gear systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for 3M pitch (3mm) open or closed timing belts, 10mm width. Verify bore diameter and keyway dimensions match your shaft before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 3M Timing Belt Pulleys\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eWide Tooth Count Range (20T–100T)\u003c\/strong\u003e — Select the exact gear ratio your drive system needs without custom machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eStep + Keyway Design\u003c\/strong\u003e — Machined step shoulder and keyway slot (3×1.4mm up to 8×3.3mm) lock the pulley axially and rotationally on the shaft.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🕳️\u003c\/span\u003e\u003cstrong\u003eMultiple Bore Options (8–25mm)\u003c\/strong\u003e — Covers common stepper motor shafts (8mm, 10mm), servo shafts (12–17mm), and larger drive shafts (19–25mm).\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e — Lightweight yet rigid; resists deformation under belt tension loads typical of CNC and automation applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003e3M Pitch Tooth Profile\u003c\/strong\u003e — Matches standard 3M belts for smooth, low-noise power transmission with minimal tooth wear over extended duty cycles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003ePrecision Bore Tolerance\u003c\/strong\u003e — Bores are finished to close tolerance for a snug shaft fit, reducing runout and vibration in high-speed motion systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 3M Timing Belt Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Pitch\u003c\/th\u003e\n\u003ctd\u003e3M (3mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Belt Width\u003c\/th\u003e\n\u003ctd\u003e10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count (Types)\u003c\/th\u003e\n\u003ctd\u003e20T, 24T, 25T, 30T, 32T, 35T, 36T, 38T, 40T, 50T, 60T, 65T, 70T, 72T, 75T, 80T, 90T, 100T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e8mm – 25mm (0.31 in – 0.98 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Width × Height\u003c\/th\u003e\n\u003ctd\u003e3×1.4mm \/ 4×1.8mm \/ 5×2.3mm \/ 6×2.8mm \/ 8×3.3mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminum alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eHard anodized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Locking\u003c\/th\u003e\n\u003ctd\u003eStep shoulder + keyway slot (set screw not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 pc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\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\n\u003csummary\u003eHow do I choose the right tooth count for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines the pulley's pitch diameter and, combined with your motor pulley, sets the drive ratio. For a 1:1 drive use matching tooth counts on both ends. For speed reduction, use a larger tooth count on the driven side. A 20T pulley at 3M pitch has a pitch diameter of approximately 19.1mm (0.75 in), while a 100T pulley reaches about 95.5mm (3.76 in).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat keyway size should I select for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the keyway to the standard key size for your shaft diameter. Common pairings: 8–10mm bore → 3×1.4mm key; 10–12mm bore → 4×1.8mm key; 12–17mm bore → 5×2.3mm key; 17–22mm bore → 6×2.8mm key; 22–25mm bore → 8×3.3mm key. Always verify against your shaft's actual keyway specification before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys compatible with GT2 or HTD belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. These pulleys use the 3M trapezoidal tooth profile, which is not interchangeable with GT2 (2mm pitch) or HTD 3M (rounded tooth) profiles. Always pair with a 3M trapezoidal timing belt of 10mm width for correct tooth engagement and load capacity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the aluminum pulley under continuous load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy pulleys are well-suited for light-to-medium duty CNC, 3D printing, and automation drives. For continuous high-torque industrial applications exceeding the belt's rated tension, consider whether a steel pulley is more appropriate. In typical desktop CNC and 3D printer use, aluminum pulleys handle the load without deformation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill the pulley corrode in a humid workshop environment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe hard-anodized finish provides good oxidation resistance for indoor workshop conditions. Anodizing creates a hard aluminum oxide layer that resists moisture and minor chemical exposure. Avoid prolonged exposure to salt spray or strong acids, which can degrade the anodized layer over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs a set screw or key included with the pulley?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo fasteners or keys are included. The pulley ships as a single machined component. You will need to source a matching key (Woodruff or parallel) for the keyway slot and a set screw if your shaft requires one. Standard metric keys are widely available at hardware and engineering suppliers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley on a 1\/2-inch (12.7mm) shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Select the variant with a 12.7mm bore. This bore size is available on several tooth count options including 3M-25T(K-Type), 3M-32T, 3M-36T, 3M-38T, and 3M-40T. Check the variant table to confirm availability for your specific tooth count before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your tooth count, keyway size, and bore diameter above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"3M-20T \/ 3*1.4mm \/ 8mm \u0026 1pcs","offer_id":52444133064978,"sku":"FXL1280-0","price":3.71,"currency_code":"USD","in_stock":true},{"title":"3M-20T (K-Type) \/ 3*1.4mm \/ 10mm \u0026 1pcs","offer_id":52444133097746,"sku":"FXL1280-1","price":3.71,"currency_code":"USD","in_stock":true},{"title":"3M-20T (K-Type) \/ 4*1.8mm \/ 10mm \u0026 1pcs","offer_id":52444133130514,"sku":"FXL1280-2","price":3.71,"currency_code":"USD","in_stock":true},{"title":"3M-24T \/ 3*1.4mm \/ 8mm \u0026 1pcs","offer_id":52444133163282,"sku":"FXL1280-3","price":3.92,"currency_code":"USD","in_stock":true},{"title":"3M-24T 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