{"product_id":"3m-timing-belt-drive-pulley-af-type-pitch-3mm-for-cnc-step-motor-12-32-teeth","title":"3M Timing Belt Drive Pulley AF-Type Pitch 3mm For CNC Step Motor 12~32 Teeth","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3M AF-Type Timing Belt Drive Pulley — Precision 3mm Pitch for CNC \u0026amp; Stepper Motor Drives\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or mismatched pulley is costing you positioning accuracy on your CNC router, 3D printer, or laser engraver, the root cause is almost always a pulley that was not engineered to the correct pitch and bore tolerance. This 3M AF-Type timing belt drive pulley is designed for engineers, makers, and machine builders who need repeatable, zero-backlash motion transfer from NEMA 17 and NEMA 23 stepper motors.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy with an anodized finish and conforms to the AF-Type flange profile. The belt pitch is 3mm (3M), and the pulley body accommodates a 11mm-wide belt slot. Tooth counts range from 12T to 32T, and bore diameters span 4mm to 15mm (approximately 0.157 in to 0.591 in), including plain round bores and keyway options (3×1.4mm, 4×1.8mm, and 5×2.3mm) for positive shaft locking.\u003c\/p\u003e\n\u003cp\u003eTypical applications include open-loop CNC axis drives where a 3M GT2-compatible belt is used, direct-drive extruder assemblies on FDM printers requiring a 3M pitch pulley for stepper motor shafts, and light-duty conveyor or indexing table builds where a compact aluminum timing pulley keeps rotating mass low.\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 3M pitch (3mm tooth spacing) synchronous belts with 11mm belt width. Fits standard NEMA 17 (5mm shaft) and NEMA 23 (6.35mm \/ 8mm shaft) stepper motors. Verify your shaft diameter and keyway dimensions before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 3M AF-Type 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\u003eAF-Type Flanged Profile\u003c\/strong\u003e — Dual-flange design keeps the 3M belt centered on the pulley face, reducing lateral drift during high-speed CNC operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003e3mm Pitch Accuracy\u003c\/strong\u003e — Tooth geometry machined to 3M pitch standard, ensuring synchronous engagement with matching 3M timing belts and consistent step-to-distance ratios.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eWide Bore \u0026amp; Keyway Selection\u003c\/strong\u003e — Plain bores from 4mm to 15mm plus keyway variants (3×1.4mm, 4×1.8mm, 5×2.3mm) cover NEMA 17, NEMA 23, and custom shaft sizes without adapter sleeves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003e12T to 32T Tooth Range\u003c\/strong\u003e — Select the tooth count that matches your target drive ratio; smaller counts increase torque multiplication while larger counts raise linear speed per motor revolution.\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 aluminum body with anodized surface treatment resists wear and corrosion in workshop and enclosed machine environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003e11mm Belt Slot Width\u003c\/strong\u003e — Standardized 11mm slot width across all tooth counts ensures drop-in compatibility with common 3M-11 belt stock used in CNC and automation builds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 3M AF-Type Timing Belt Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Pitch\u003c\/th\u003e\n\u003ctd\u003e3mm (3M)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePulley Type\u003c\/th\u003e\n\u003ctd\u003eAF-Type (flanged)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e12T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width (Slot)\u003c\/th\u003e\n\u003ctd\u003e11mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e4mm \/ 5mm \/ 6mm \/ 6.35mm \/ 7mm \/ 8mm \/ 10mm \/ 11mm \/ 12mm \/ 12.7mm \/ 14mm \/ 15mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003e3×1.4mm \/ 4×1.8mm \/ 5×2.3mm (select variants)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminum alloy, anodized finish\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\u003eOutside Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSet Screw\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Belt Standard\u003c\/th\u003e\n\u003ctd\u003e3M synchronous \/ GT2-3M\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Application\u003c\/th\u003e\n\u003ctd\u003eCNC routers, 3D printers, laser engravers, stepper motor 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\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right tooth count for my drive system?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe tooth count determines your drive ratio. Divide the driven pulley teeth by the drive pulley teeth to get the ratio. For example, a 20T drive pulley paired with a 40T driven pulley gives a 2:1 reduction, doubling torque while halving speed. For CNC axes, match the tooth count to your desired steps-per-mm calculation based on your stepper motor's step angle and microstepping setting.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size fits a NEMA 17 stepper motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStandard NEMA 17 stepper motors have a 5mm output shaft. Select the 5mm bore variant. If your motor has a flat (D-cut) on the shaft, a set screw bore is sufficient. If you need positive locking without a flat, consider a keyway bore variant where available.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size fits a NEMA 23 stepper motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNEMA 23 motors typically use a 6.35mm (1\/4 inch) or 8mm shaft depending on the manufacturer. Check your motor's datasheet for the exact shaft diameter. Both 6.35mm and 8mm bore options are available, including keyway variants for shaft sizes where keyway locking is required.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a plain bore and a keyway bore?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA plain bore relies on a set screw pressing against the shaft to prevent rotation. A keyway bore includes a machined slot that accepts a matching key inserted between the shaft and pulley, providing a positive mechanical lock that resists higher torque loads and prevents rotational slip under shock loads. Keyway variants are recommended for applications with frequent direction reversals or high inertia loads.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley compatible with GT2 3mm pitch belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The 3M pitch (3mm tooth spacing) used on these AF-type pulleys is dimensionally compatible with GT2-3M profile belts. Confirm that your belt is labeled 3M or GT2-3M with an 11mm width to ensure proper engagement. Standard 2mm pitch GT2 belts (the most common FDM printer belt) are not compatible — verify your belt pitch before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I calculate the pitch diameter and linear speed for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePitch diameter (PD) = (Number of Teeth × Pitch) ÷ π. For a 20T pulley: PD = (20 × 3mm) ÷ 3.1416 ≈ 19.1mm. Linear belt speed per motor revolution = PD × π = tooth count × 3mm. For a 20T pulley, one full motor revolution moves the belt 60mm. Use this to set your firmware steps-per-mm value.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat material are these pulleys made from, and will they corrode in a humid workshop?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe pulleys are machined from aluminum alloy with an anodized surface treatment. Anodizing creates a hard oxide layer that resists oxidation and light corrosion in typical indoor workshop environments. For outdoor or high-humidity enclosures, periodic inspection is recommended, but standard workshop conditions present no corrosion concern.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these pulleys for a belt-driven conveyor or indexing table?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, provided the load torque and belt tension remain within the rated capacity of the aluminum pulley and the 3M belt. For light-duty conveyor and indexing applications driven by NEMA 17 or NEMA 23 motors, these pulleys are well-suited. For heavy industrial loads, contact us to confirm suitability for your specific torque and speed requirements.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your tooth count and bore size above, then add to cart.\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"AF-Type \/ 3M 12T \/ 4mm \u0026 11mm","offer_id":52445126590738,"sku":"GLFBBYWGLBZSJ068450x1","price":11.4,"currency_code":"USD","in_stock":true},{"title":"AF-Type \/ 3M 12T \/ 5mm \u0026 11mm","offer_id":52445126623506,"sku":"GLFBBYWGLBZSJ068451x1","price":11.4,"currency_code":"USD","in_stock":true},{"title":"AF-Type \/ 3M 14T \/ 4mm \u0026 11mm","offer_id":52445126656274,"sku":"GLFBBYWGLBZSJ068452x1","price":11.4,"currency_code":"USD","in_stock":true},{"title":"AF-Type \/ 3M 14T \/ 5mm \u0026 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