{"product_id":"s2m-90-120t-timing-belt-pulley-pitch-2mm-keyway-cnc-drive-7mm","title":"S2M 90-120T Timing Belt Pulley Pitch 2mm With Keyway CNC Drive Pulley Width 7mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eS2M Timing Belt Pulley 90–120T — Precision CNC Drive Pulley with Keyway, Pitch 2mm, Width 7mm\u003c\/h2\u003e\n    \u003cp\u003eWhen your CNC router, 3D printer, or automation system demands repeatable, slip-free motion, a loose-fitting or mismatched pulley becomes the weakest link in the entire drive train. Makers, engineers, and small-workshop operators who rely on S2M belt systems need a pulley that locks onto the shaft without play and meshes cleanly with the belt at every tooth. This S2M timing belt pulley is engineered for exactly that role.\u003c\/p\u003e\n    \u003cp\u003eEach pulley is machined from aluminum alloy, featuring an S2M tooth profile with a 2mm pitch and a 7mm belt-contact width. Tooth counts span 90T, 100T, 110T, and 120T, giving pitch diameters of approximately 57.3mm (2.26 in), 63.7mm (2.51 in), 70.0mm (2.76 in), and 76.4mm (3.01 in) respectively. Bore options range from 8mm to 25mm (0.31–0.98 in), each paired with a precision-cut keyway — 3×1.4mm through 8×3.3mm — to transmit torque without relying on set-screws alone.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include CNC gantry axis drives where backlash must be minimized, desktop 3D printer X\/Y motion systems using S2M open-loop belts, and light-duty conveyor or indexing table builds in educational labs and maker spaces. The keyed bore also makes these pulleys a reliable choice for stepper-motor shaft upgrades in DIY automation projects requiring precise positioning.\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\u003eCompatible with:\u003c\/strong\u003e S2M synchronous timing belts, 2mm pitch, 6–7mm belt width. Verify bore diameter and keyway size against your shaft before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These S2M Timing Belt Pulleys\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🦷\u003c\/span\u003e\n        \u003cstrong\u003eFour Tooth-Count Options (90T \/ 100T \/ 110T \/ 120T)\u003c\/strong\u003e\u003cbr\u003e\n        Choose the tooth count that matches your required drive ratio. More teeth mean a larger pitch diameter and smoother belt wrap, reducing tooth-load stress at higher speeds.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003ePrecision Keyway for Positive Torque Transfer\u003c\/strong\u003e\u003cbr\u003e\n        Each bore is cut with a matching keyway (3×1.4mm up to 8×3.3mm) so the pulley locks to the shaft mechanically — no slipping under load, no reliance on friction alone.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eWide Bore Range: 8mm – 25mm\u003c\/strong\u003e\u003cbr\u003e\n        Fits common stepper motor shafts (8mm), servo shafts (10–14mm), and larger drive shafts up to 25mm, covering the majority of DIY and light-industrial applications.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n        \u003cstrong\u003eS2M 2mm Pitch — Low-Backlash Synchronous Drive\u003c\/strong\u003e\u003cbr\u003e\n        The 2mm pitch S2M profile delivers positive engagement with the belt, eliminating the slip inherent in V-belt or friction drives and maintaining positional accuracy over long run cycles.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\n        \u003cstrong\u003e7mm Belt-Width Groove\u003c\/strong\u003e\u003cbr\u003e\n        The 7mm-wide tooth groove accepts standard S2M belts in the 6–7mm width range, keeping the belt tracked and preventing edge wear during continuous operation.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n        \u003cstrong\u003eAluminum Alloy Construction — Lightweight and Machinable\u003c\/strong\u003e\u003cbr\u003e\n        Aluminum alloy keeps rotating mass low (important for acceleration-sensitive CNC axes) while remaining easy to modify on a lathe or mill if a custom bore or flange is needed.\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — S2M Timing Belt Pulley\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eBelt Profile\u003c\/th\u003e\n\u003ctd\u003eS2M (Synchronous, 2mm pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBelt Width (groove)\u003c\/th\u003e\n\u003ctd\u003e7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e90T \/ 100T \/ 110T \/ 120T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options (approx. 57.3–76.4 mm \/ 2.26–3.01 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e8 \/ 10 \/ 12 \/ 12.7 \/ 14 \/ 15 \/ 16 \/ 17 \/ 18 \/ 19 \/ 20 \/ 25 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway Size\u003c\/th\u003e\n\u003ctd\u003e3×1.4 mm \/ 4×1.8 mm \/ 5×2.3 mm \/ 6×2.8 mm \/ 8×3.3 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHub Width\u003c\/th\u003e\n\u003ctd\u003e7 mm (nominal)\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\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eCNC drives, 3D printers, automation, conveyor indexing\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 tooth count (90T, 100T, 110T, or 120T)?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe tooth count determines the pulley's pitch diameter and, together with your motor pulley's tooth count, sets the drive ratio. A higher tooth count gives a larger diameter and a lower speed ratio (more torque, less speed) when paired with a smaller drive pulley. Calculate your required ratio first, then select the tooth count that achieves it. If you are replacing an existing pulley, match the tooth count exactly to maintain the same belt length and tension.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich bore size should I select for my stepper motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eMeasure your motor shaft diameter with a caliper before ordering. Common stepper motor shaft sizes are 5mm, 6.35mm (1\/4 in), 8mm, and 10mm. This pulley range starts at 8mm bore — if your shaft is smaller, this series is not the right fit. For 8mm shafts choose the 8mm bore with the 3×1.4mm keyway; for 10mm shafts choose 10mm bore with either the 3×1.4mm or 4×1.8mm keyway depending on your key stock.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat keyway size corresponds to each bore diameter?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe keyway size is paired with the bore in each variant: 8mm and 10mm bores use a 3×1.4mm keyway; 10mm and 12mm bores are also available with a 4×1.8mm keyway; 12.7mm, 14mm, 15mm, 16mm, and 17mm bores use a 5×2.3mm keyway; 18mm, 19mm, and 20mm bores use a 6×2.8mm keyway; and the 25mm bore uses an 8×3.3mm keyway. Select the variant whose keyway matches the key stock already cut on your shaft.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this pulley work with my existing S2M timing belt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes, provided your belt is an S2M profile with a 2mm pitch and a width of 6–7mm. The S2M tooth profile is standardized, so any S2M belt from any manufacturer will mesh correctly with these pulleys. If your belt is wider than 7mm it will overhang the groove flanges and may track poorly — in that case you need a wider-groove pulley. Confirm both the pitch and the belt width before ordering.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong is the keyway connection — can it handle high torque?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA keyed connection is significantly stronger than a set-screw-only connection because the key bears the shear load across its full cross-section rather than relying on friction. For the light-to-medium torque levels typical of CNC routers, 3D printers, and small conveyor drives, the keyway connection on these aluminum pulleys is more than adequate. For very high-torque or shock-load applications, consider a steel pulley or a tapered-bushing design instead.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs aluminum suitable for my application, or do I need a steel pulley?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eAluminum alloy is the right choice for the vast majority of DIY and light-industrial S2M drive applications. It keeps rotating inertia low (critical for fast-accelerating CNC axes), is easy to machine if you need to modify the bore, and resists corrosion without surface treatment. Steel pulleys are generally only necessary when belt tension is very high, operating temperatures exceed 120°C, or the pulley is subject to repeated impact loads. If you are unsure, aluminum is the standard choice for S2M drives.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this pulley without a key if I don't have key stock?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eTechnically the pulley will fit on a plain shaft without a key, and you can secure it with a set-screw through the existing threaded hole (if present) or by adding one. However, running without a key under any meaningful torque load risks the pulley spinning on the shaft and damaging both the bore and the shaft surface. We recommend always using the correct key for reliable, long-term operation.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat belt length do I need for a two-pulley drive system?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eBelt length depends on the center distance between the two pulleys and the pitch diameters of both pulleys. Use the standard timing belt length formula: L = 2C + π(D₁+D₂)\/2 + (D₂−D₁)²\/(4C), where C is center distance and D₁, D₂ are the pitch diameters. The pitch diameters for these pulleys are approximately: 90T ≈ 57.3mm, 100T ≈ 63.7mm, 110T ≈ 70.0mm, 120T ≈ 76.4mm. Round up to the nearest available S2M belt length.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your Number of Teeth, Bore, and Keyway \u0026amp; Amount 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 tooth count (90T, 100T, 110T, or 120T)?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The tooth count determines the pulley's pitch diameter and drive ratio. A higher tooth count gives a larger diameter and lower speed ratio. Calculate your required ratio first, then select the tooth count that achieves it. If replacing an existing pulley, match the tooth count exactly to maintain belt length and tension.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore size should I select for my stepper motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor shaft diameter with a caliper before ordering. This pulley range starts at 8mm bore. For 8mm shafts choose the 8mm bore with the 3x1.4mm keyway; for 10mm shafts choose 10mm bore with either the 3x1.4mm or 4x1.8mm keyway depending on your key stock.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What keyway size corresponds to each bore diameter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"8mm and 10mm bores use a 3x1.4mm keyway; 10mm and 12mm bores are also available with a 4x1.8mm keyway; 12.7mm–17mm bores use a 5x2.3mm keyway; 18mm–20mm bores use a 6x2.8mm keyway; 25mm bore uses an 8x3.3mm keyway.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this pulley work with my existing S2M timing belt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, provided your belt is an S2M profile with a 2mm pitch and a width of 6–7mm. The S2M tooth profile is standardized, so any S2M belt will mesh correctly with these pulleys. Confirm both the pitch and the belt width before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is the keyway connection — can it handle high torque?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A keyed connection is significantly stronger than a set-screw-only connection because the key bears the shear load across its full cross-section. For light-to-medium torque levels typical of CNC routers, 3D printers, and small conveyor drives, the keyway connection on these aluminum pulleys is more than adequate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is aluminum suitable for my application, or do I need a steel pulley?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Aluminum alloy is the right choice for the vast majority of DIY and light-industrial S2M drive applications. It keeps rotating inertia low, is easy to machine, and resists corrosion. Steel pulleys are generally only necessary when belt tension is very high, operating temperatures exceed 120°C, or the pulley is subject to repeated impact loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this pulley without a key if I don't have key stock?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The pulley will fit on a plain shaft without a key, but running without a key under any meaningful torque load risks the pulley spinning on the shaft. We recommend always using the correct key for reliable, long-term operation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What belt length do I need for a two-pulley drive system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Belt length depends on center distance and pitch diameters of both pulleys. Use the formula: L = 2C + π(D1+D2)\/2 + (D2−D1)²\/(4C). Pitch diameters: 90T ≈ 57.3mm, 100T ≈ 63.7mm, 110T ≈ 70.0mm, 120T ≈ 76.4mm. Round up to the nearest available S2M belt length.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"S2M90T \/ 10mm \/ 3x1.4mm \u0026 1Pcs","offer_id":52446626513170,"sku":"FXLS2M90TC7D10K3BFx1","price":35.07,"currency_code":"USD","in_stock":true},{"title":"S2M90T \/ 10mm \/ 4x1.8mm \u0026 1Pcs","offer_id":52446626545938,"sku":"FXLS2M90TC7D10K4BFx1","price":35.07,"currency_code":"USD","in_stock":true},{"title":"S2M90T \/ 12.7mm \/ 5x2.3mm \u0026 1Pcs","offer_id":52446626578706,"sku":"FXLS2M90TC7D12.7K5BFx1","price":34.88,"currency_code":"USD","in_stock":true},{"title":"S2M90T \/ 12mm \/ 4x1.8mm \u0026 1Pcs","offer_id":52446626611474,"sku":"FXLS2M90TC7D12K4BFx1","price":34.94,"currency_code":"USD","in_stock":true},{"title":"S2M90T \/ 14mm \/ 5x2.3mm \u0026 1Pcs","offer_id":52446626644242,"sku":"FXLS2M90TC7D14K5BFx1","price":34.75,"currency_code":"USD","in_stock":true},{"title":"S2M90T \/ 15mm \/ 5x2.3mm \u0026 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