{"product_id":"s45m-rubber-timing-belt-closed-loop-pitch-45mm","title":"S4.5M Rubber Timing Belt Closed Loop – 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\u003eS4.5M Closed Loop Timing Belt — Precise Drive for 3D Printers, CNC \u0026amp; Robotics\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or stretched drive belt causes layer shifts on your 3D printer, missed steps on your CNC router, or erratic motion in your automation rig, the root cause is almost always a belt that no longer holds its pitch under load. Engineers, makers, and repair technicians who need a dimensionally stable, closed-loop synchronous belt without cutting and joining open-ended stock reach for the S4.5M closed loop timing belt as a reliable solution.\u003c\/p\u003e\n\u003cp\u003eEach belt is a single closed loop with a 4.5mm tooth pitch (S4.5M profile), available in perimeters from 180mm (≈7.1\") to 905mm (≈35.6\") and belt widths of 10mm (≈3\/8\"), 15mm (≈19\/32\"), 20mm (≈25\/32\"), 25mm (≈1\"), 30mm (≈1-3\/16\"), and 40mm (≈1-9\/16\"). The rubber body is reinforced with a tensile cord core for dimensional stability, and the tooth geometry is formed to mesh accurately with S4.5M-profile pulleys.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include replacing worn drive belts on FDM 3D printer X\/Y axes, fitting closed-loop drive systems on desktop CNC routers and laser engravers, and building or servicing conveyor or indexing mechanisms in light industrial and robotics applications where a slip-free synchronous closed loop timing belt is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003eℹ️\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits S4.5M-profile pulleys with a 4.5mm tooth pitch. Select the perimeter and belt width that match your machine's pulley center distance and groove width. See variant options for available sizes.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 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\u003eClosed-Loop Construction\u003c\/strong\u003e — Factory-formed as a continuous loop with no splice or join, eliminating the weak point common in cut-and-joined open belts used in closed loop 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 S-Tooth Pitch\u003c\/strong\u003e — The S4.5M tooth profile provides accurate, backlash-minimized engagement with matching S4.5M pulleys, supporting repeatable positioning on 3D printer axes and CNC motion systems.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Selection\u003c\/strong\u003e — Perimeters from 180mm to 905mm and widths from 10mm to 40mm cover a broad range of machine configurations, from compact desktop 3D printers to larger gantry-style CNC routers.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🧱\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eReinforced Rubber Body\u003c\/strong\u003e — Rubber compound construction with a tensile cord core resists elongation under cyclic load, helping maintain consistent pitch length over extended service intervals.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDrop-In Replacement Fit\u003c\/strong\u003e — Dimensioned to S4.5M standard, making these belts a straightforward replacement for worn synchronous drive belts in machines originally fitted with S4.5M closed loop timing belts.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eVersatile Drive Applications\u003c\/strong\u003e — Suitable for 3D printer X\/Y axis drives, laser engraver gantries, light conveyor indexing, and robotics joint drives where a reliable rubber timing belt closed loop is needed.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — S4.5M Closed Loop 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\u003eS4.5M (S-tooth, synchronous)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Pitch\u003c\/th\u003e\n\u003ctd\u003e4.5mm (≈0.177\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Perimeters\u003c\/th\u003e\n\u003ctd\u003e180mm (≈7.1\") – 905mm (≈35.6\"); see variant options for all sizes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Belt Widths\u003c\/th\u003e\n\u003ctd\u003e10mm, 15mm, 20mm, 25mm, 30mm, 40mm; see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Body Material\u003c\/th\u003e\n\u003ctd\u003eRubber (neoprene\/EPDM compound, typically)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTensile Cord\u003c\/th\u003e\n\u003ctd\u003eFiberglass or steel cord reinforcement (contact us to confirm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLoop Type\u003c\/th\u003e\n\u003ctd\u003eClosed loop (no splice)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Pulley Profile\u003c\/th\u003e\n\u003ctd\u003eS4.5M sprocket\/pulley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003e3D printer axes, CNC router drives, laser engravers, light conveyor systems, robotics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003eSee variant options or contact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\/Finish\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-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eSize Tip:\u003c\/strong\u003e Before ordering, measure your existing belt's loop perimeter and width, or calculate the required perimeter from your pulley center distance. Perimeter = 2 × center distance + (π × pulley pitch diameter). If you need help selecting the right size, contact us before purchasing.\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 perimeter (loop length) for my machine?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the center-to-center distance between your drive and driven pulleys, then calculate the required belt loop length: \u003cstrong\u003ePerimeter ≈ 2 × center distance + (π × pulley pitch diameter)\u003c\/strong\u003e. For example, a 180mm (≈7.1\") perimeter suits compact drives, while a 905mm (≈35.6\") perimeter fits larger frames. Always verify against your machine's spec sheet or measure the old belt directly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat belt width should I select for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eWider belts generally carry higher loads. For light-duty 3D printer axes, 10mm or 15mm widths are typically sufficient. For CNC routers or heavier gantry systems, 20–40mm widths are generally recommended. Confirm your pulley's groove width before ordering — the belt width must not exceed the pulley groove width.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat load or torque can these S4.5M timing belts handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eLoad capacity depends on belt width, perimeter, and operating speed. Wider belts and shorter perimeters typically support higher torques. For precise load ratings specific to your application, refer to S4.5M belt standard data sheets or contact us to confirm suitability before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these belts suitable for outdoor or high-humidity environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe rubber body generally provides good resistance to moisture and moderate temperature ranges. However, prolonged exposure to UV radiation, oils, or extreme temperatures may reduce service life. For outdoor or harsh-environment installations, verify operating conditions and consider a protective enclosure where possible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat pulley profile is compatible with S4.5M belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eS4.5M belts require \u003cstrong\u003eS4.5M-profile pulleys\u003c\/strong\u003e (also called S4.5M sprockets) with a 4.5mm tooth pitch. Ensure your pulley's tooth pitch matches 4.5mm and the groove width accommodates your chosen belt width (10–40mm). Using a mismatched pulley profile will cause premature wear or belt failure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this as a direct replacement for my existing timing belt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eIn most cases, yes. Match the perimeter, belt width, and pitch (4.5mm \/ S4.5M profile) of your existing belt. If your original belt is labeled S4.5M with the same dimensions, this belt is typically a direct drop-in replacement. If unsure, measure the old belt's loop length and width, or contact us before purchasing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat materials are used in this timing belt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe belt body is made from a rubber compound (typically neoprene or EPDM) with a tensile cord reinforcement — generally fiberglass or steel — for dimensional stability under cyclic load. The tooth surface is formed to mesh accurately with S4.5M pulleys. Contact us to confirm the specific cord material for your order if this is critical to your application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003eperimeter and belt 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":"S4.5M \/ 180mm \/ 10mm","offer_id":52367791849746,"sku":"BGM180S4.5M10x1","price":4.61,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 225mm \/ 10mm","offer_id":52367791882514,"sku":"BGM225S4.5M10x1","price":4.65,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 252mm \/ 10mm","offer_id":52367791915282,"sku":"BGM252S4.5M10x1","price":4.99,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 275mm \/ 10mm","offer_id":52367791948050,"sku":"BGM275S4.5M10x1","price":5.21,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 284mm \/ 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10mm","offer_id":52367792439570,"sku":"BGM450S4.5M10x1","price":6.12,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 486mm \/ 10mm","offer_id":52367792472338,"sku":"BGM486S4.5M10x1","price":6.42,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 491mm \/ 10mm","offer_id":52367792505106,"sku":"BGM491S4.5M10x1","price":6.42,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 500mm \/ 10mm","offer_id":52367792537874,"sku":"BGM500S4.5M10x1","price":6.42,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 504mm \/ 10mm","offer_id":52367792570642,"sku":"BGM504S4.5M10x1","price":6.99,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 540mm \/ 10mm","offer_id":52367792603410,"sku":"BGM540S4.5M10x1","price":6.99,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 558mm \/ 10mm","offer_id":52367792636178,"sku":"BGM558S4.5M10x1","price":6.99,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 653mm \/ 10mm","offer_id":52367792668946,"sku":"BGM653S4.5M10x1","price":7.56,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 711mm \/ 10mm","offer_id":52367792701714,"sku":"BGM711S4.5M10x1","price":8.81,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 864mm \/ 10mm","offer_id":52367792734482,"sku":"BGM864S4.5M10x1","price":10.17,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 905mm \/ 10mm","offer_id":52367792767250,"sku":"BGM905S4.5M10x1","price":10.8,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 180mm \/ 15mm","offer_id":52367792800018,"sku":"BGM180S4.5M15x1","price":6.12,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 225mm \/ 15mm","offer_id":52367792832786,"sku":"BGM225S4.5M15x1","price":6.12,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 252mm \/ 15mm","offer_id":52367792865554,"sku":"BGM252S4.5M15x1","price":6.69,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 275mm \/ 15mm","offer_id":52367792898322,"sku":"BGM275S4.5M15x1","price":6.99,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 284mm \/ 15mm","offer_id":52367792931090,"sku":"BGM284S4.5M15x1","price":6.99,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 297mm \/ 15mm","offer_id":52367792963858,"sku":"BGM297S4.5M15x1","price":6.99,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 315mm \/ 15mm","offer_id":52367792996626,"sku":"BGM315S4.5M15x1","price":7.56,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 324mm \/ 15mm","offer_id":52367793029394,"sku":"BGM324S4.5M15x1","price":7.56,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 333mm \/ 15mm","offer_id":52367793062162,"sku":"BGM333S4.5M15x1","price":7.56,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 338mm \/ 15mm","offer_id":52367793094930,"sku":"BGM338S4.5M15x1","price":7.56,"currency_code":"USD","in_stock":true},{"title":"S4.5M \/ 342mm \/ 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