{"product_id":"sts-s4-5m-timing-belt-4-5mm-pitch-closed-loop-rubber","title":"STS S4.5M Closed Loop Timing Belt — Pitch 4.5mm, Width 10–40mm","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSTS S4.5M Closed Loop Timing Belt — Precise 4.5mm Pitch Drive for CNC, 3D Printers \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or mismatched drive belt causes positioning errors in your CNC router, 3D printer, or conveyor system, the entire project suffers. Engineers, makers, and machine builders who need reliable, slip-free synchronous power transmission rely on closed loop timing belts with a consistent tooth profile and accurate pitch. These STS S4.5M timing belts are built for exactly that demand.\u003c\/p\u003e\n\u003cp\u003eEach belt is a single closed loop of rubber construction with a curvilinear S4.5M tooth profile and a 4.5mm pitch. Available in 29 circumference sizes ranging from 180mm (≈7.1\") to 905mm (≈35.6\"), and in six belt widths — 10mm, 15mm, 20mm, 25mm, 30mm, and 40mm — to match a wide range of pulley configurations. The rubber body is reinforced with tensile cord (typically fiberglass or steel, standard for this belt class) to resist stretch under load.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC router axis drives, 3D printer motion systems requiring accurate layer positioning, laser engraver gantry drives, light conveyor belt replacements, and robotics joint actuation — anywhere a closed loop synchronous belt with 4.5mm pitch is specified.\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 use with S4.5M (STS profile) pulleys. Match belt width to your pulley groove width. Verify tooth count by dividing belt circumference by 4.5mm (e.g., 180mm ÷ 4.5 = 40 teeth).\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eSize confirmation:\u003c\/strong\u003e The \"Types\" option lists the full loop circumference in mm, not the belt length between pulleys. Measure your existing belt or calculate your drive geometry before ordering. If unsure, contact us to confirm.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These STS S4.5M Closed Loop Timing Belts\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCurvilinear S4.5M Tooth Profile\u003c\/strong\u003e — The rounded tooth geometry distributes load across a larger contact area, reducing tooth shear stress compared to trapezoidal profiles at similar pitch sizes, which is why this profile is favored in precision CNC and 3D printer drive systems.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e4.5mm Pitch for Accurate Positioning\u003c\/strong\u003e — A consistent 4.5mm tooth-to-tooth spacing enables predictable motion ratios when paired with a matched S4.5M pulley, making these belts suitable for closed-loop synchronous drives where step accuracy matters.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eClosed Loop Construction — No Splicing Required\u003c\/strong\u003e — Each belt is manufactured as a continuous loop, eliminating the weak point of a mechanical splice and ensuring uniform tension distribution around the full circumference.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSix Width Options (10mm to 40mm)\u003c\/strong\u003e — Wider belts carry more torque; narrower belts reduce rotating mass and fit compact pulley stacks. Selecting the correct width for your pulley groove is the single most important fit factor for these closed loop rubber timing belts.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🧲\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eTensile Cord Reinforcement\u003c\/strong\u003e — The rubber body is reinforced with tensile cord to resist elongation under dynamic loads, maintaining consistent center distance and tooth mesh engagement over the service life of the belt.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🗂️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e29 Circumference Sizes in One Listing\u003c\/strong\u003e — From 180mm (≈7.1\") to 905mm (≈35.6\"), this listing covers a broad range of drive geometries so you can find the exact loop size for your machine without sourcing from multiple suppliers.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — STS S4.5M Closed Loop Rubber Timing Belt\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Profile\u003c\/th\u003e\n\u003ctd\u003eSTS (S4.5M) — Curvilinear tooth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003e4.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Type\u003c\/th\u003e\n\u003ctd\u003eClosed loop (endless)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Material\u003c\/th\u003e\n\u003ctd\u003eRubber with tensile cord reinforcement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Widths\u003c\/th\u003e\n\u003ctd\u003e10mm, 15mm, 20mm, 25mm, 30mm, 40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Circumferences\u003c\/th\u003e\n\u003ctd\u003e180mm (≈7.1\") to 905mm (≈35.6\") — 29 sizes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e40 teeth (180mm) to 201 teeth (905mm) — calculated at 4.5mm pitch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Pulley Profile\u003c\/th\u003e\n\u003ctd\u003eS4.5M (STS standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eCNC routers, 3D printers, laser engravers, conveyors, robotics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece (1Pcs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\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\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right belt length and width?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe \"Types\" option shows the belt \u003cstrong\u003ecircumference\u003c\/strong\u003e in millimeters — this is the full loop measurement, not the span between pulleys. To find your size: measure your existing belt around its full loop, or calculate (center distance × 2) + (pulley 1 circumference + pulley 2 circumference) ÷ 2. For width, match your pulley groove width exactly — generally use the narrowest width that fits your pulley to minimize drag. Example: 450mm ÷ 25.4 ≈ 17.7\" loop circumference.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat tooth profile does the S4.5M use, and how does it differ from MXL or GT2?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe STS S4.5M uses a \u003cstrong\u003ecurvilinear (rounded) tooth profile\u003c\/strong\u003e with a 4.5mm pitch. MXL has a 2.032mm pitch with a trapezoidal profile; GT2 has a 2mm pitch with a curvilinear profile. The S4.5M is a larger-pitch belt suited for higher torque or longer span drives. These belts are \u003cstrong\u003enot interchangeable\u003c\/strong\u003e with MXL, GT2, or other pitch standards — always match both pitch and profile.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow much load or torque can these timing belts handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eLoad capacity depends on belt width, number of teeth in mesh, pulley diameter, and operating speed. Generally, wider belts (30mm, 40mm) handle significantly higher torque than narrower belts (10mm, 15mm) at the same pitch. For precise load ratings specific to your drive geometry, consult your machine's engineering documentation or contact us to confirm suitability for your application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these belts be used outdoors or in wet\/oily environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe rubber compound used in STS-profile timing belts is generally resistant to moderate moisture and dust, making them suitable for most indoor industrial and workshop environments. Prolonged exposure to petroleum-based oils, solvents, or direct UV radiation can degrade rubber over time. For outdoor installations or chemically aggressive environments, verify compatibility with your specific conditions before use, or contact us to confirm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with standard S4.5M pulleys from other brands?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, in most cases. These belts are manufactured to the S4.5M (STS) tooth profile and 4.5mm pitch standard, so they are generally compatible with any pulley made to the same specification regardless of brand. Always verify that your pulley's groove width matches your selected belt width, and that the pulley tooth profile is STS\/S4.5M — not a different curvilinear standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat machines and applications are these timing belts used for?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSTS S4.5M closed loop timing belts are commonly used in: CNC router X\/Y axis drives, 3D printer motion systems requiring accurate layer positioning, laser engraver gantry drives, light-duty conveyor belt replacements, robotics joint actuation, and general light industrial automation where a slip-free synchronous drive with 4.5mm pitch is specified.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I convert the belt circumference from mm to inches?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eDivide the mm value by 25.4 to get inches. Quick reference examples from this listing:\u003c\/p\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e180mm ÷ 25.4 ≈ 7.09\"\u003c\/li\u003e\n\u003cli\u003e315mm ÷ 25.4 ≈ 12.40\"\u003c\/li\u003e\n\u003cli\u003e450mm ÷ 25.4 ≈ 17.72\"\u003c\/li\u003e\n\u003cli\u003e653mm ÷ 25.4 ≈ 25.71\"\u003c\/li\u003e\n\u003cli\u003e905mm ÷ 25.4 ≈ 35.63\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe listed circumference is the full closed loop measurement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003ebelt circumference (Types) and width\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"180-S4.5M \/ 10mm \/ 1Pcs","offer_id":52368325902610,"sku":"FXL180S4.5M10x1","price":4.22,"currency_code":"USD","in_stock":true},{"title":"225-S4.5M \/ 10mm \/ 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